Shell Nigeria Exploration and Production Company Limited Bonga FPSO Plant Operating Procedures Manual Volume 35 Ancillary Living Quarters (ALQ) OPRM-2003-0335 Version: 1.0 This document is not confidential. TheCopyrightofthisdocumentisvestedinShellNigeria ExplorationandProductionCompanyLimited.Allrightsreserved. Neitherthewholenoranypartofthisdocumentmaybe reproduced,storedinanyretrievalsystemortransmittedinany formorbyanymeans(electronic,mechanical,reprographic, recordingorotherwise)withoutthepriorwrittenconsentofthe copyright owner. Shell Nigeria E & P Company Ltd.Unrestricted OPRM-2003-0335Page ii of viii 10-April-2006 2.0 2.0 2.0 2.0PURPOSE PURPOSE PURPOSE PURPOSE Thepurposeofthisdocumentistoprovideguidanceonthesafe,efficient andenvironmentallyawareoperationoftheAncillaryLivingQuarters Systems. ItisoneVolumewithinanoverallsuiteofVolumes,whichcomprisethe BongaFPSOPlantOperatingProceduresManual(POPM).Thefulllistingof Volumes is as follows: Volume 1Field and Facilities Overview Volume 2ASubsea Production Facilities Volume 2BSubsea Waterflood System Volume 2CSubsea Control System Volume 2DFlow Assurance Guidelines Volume 3Oil Separation and Treating Volume 4Oil Storage, Handling and Ballast Systems Volume 5Oil Metering and Export SystemVolume 6Vapour Recovery Compression System Volume 7Field Gas Compression System Volume 8Gas Dehydration/Glycol Regeneration Systems Volume 9Gas Export/Import/Lift Systems (incl Metering) Volume 10Flare and Vent Systems Volume 11Produced Water Treatment System Volume 12Waterflood System Volume 13Chemical Injection and Methanol Injection System (Hull and Topsides) Volume 14Fuel Gas System Volume 15Heating Medium System Volume 16Drainage Systems Volume 17Sewage Treatment System Volume 18Bilge and Sludge Systems Volume 19Inert Gas System Volume 20Nitrogen Generation System Volume 21Seawater System (Hull) Volume 22Fresh and Potable Water Systems Volume 23Diesel Fuel System Volume 24Aviation Fuel System Volume 25Instrument and Utility Air System Volume 26Hydraulic Power Systems (Hull) Volume 27Fire Protection Systems and Equipment (Hull and Topsides) Volume 28Safety and Lifesaving Equipment Volume 29PSCS and ESS Volume 30Power Generation and Distribution Systems (Hull and Topsides) Volume 31Black Start Procedures Volume 32HVAC Systems Volume 33Deck Machinery and Mechanical Handling Systems (Cranes, etc) Volume 34Telecommunications Volume 35 Volume 35 Volume 35 Volume 35Ancillary Living Quarters (ALQ) Ancillary Living Quarters (ALQ) Ancillary Living Quarters (ALQ) Ancillary Living Quarters (ALQ) Shell Nigeria E & P Company Ltd.Unrestricted OPRM-2003-0335Page iii of viii 10-April-2006 3.0 3.0 3.0 3.0SCOPE SCOPE SCOPE SCOPE Thisdocumentprovidesadetaileddescriptionoftheplantandequipment whichcomprisetheAncillaryLivingQuartersandincludesstep-by-step guidanceontheoperationofthesystemanditsequipment,underboth normal and abnormal operation. 4.0 4.0 4.0 4.0TARGET READERSHIP TARGET READERSHIP TARGET READERSHIP TARGET READERSHIP AllSNEPCOstaff,contractorsandotherthird-partypersonnelwhomaybe involvedintheoperationoftheAncillaryLivingQuartersSystemsonboard the Bonga FPSO. 5.0 5.0 5.0 5.0SPECIAL NOTE SPECIAL NOTE SPECIAL NOTE SPECIAL NOTE Not applicable. 6.0 6.0 6.0 6.0ABBREVIATIONS ABBREVIATIONS ABBREVIATIONS ABBREVIATIONS Theabbreviationsusedwithinthisdocumentarelistedattheendofthese introductory pages. 7.0 7.0 7.0 7.0REFERENCE INFORMATION/SUPPORTING DOCUMENTATION REFERENCE INFORMATION/SUPPORTING DOCUMENTATION REFERENCE INFORMATION/SUPPORTING DOCUMENTATION REFERENCE INFORMATION/SUPPORTING DOCUMENTATION Theprimaryreference/supportingdocuments,whichhavebeeneitherused orreferredtointhedevelopmentofthisdocument,arelistedattheendof theseintroductorypages.ThesearepartoftheavailableOperational DocumentationthatSNEPCOOffshoreOperations(OO)hasinplaceto supportitsday-to-dayoperations.Theseandmanyotherdocumentsare availablewithintheSNEPCOLivelinkSystem.Whereappropriate,these documents have been cross-referenced within this document. Shell Nigeria E & P Company Ltd.Unrestricted OPRM-2003-0335Page iv of viii 10-April-2006 Abbreviations Abbreviations Abbreviations Abbreviations ACUAir Conditioning Unit AHUAir Handling Unit ALQAncillary Living Quarters BSDPBackup Summary Display Panel CERCentral Equipment Room DCSDistributed Control System ESSEmergency Support System F&GFire and Gas FPSOFloating Production, Storage and Offloading GRPGlass Reinforced Plastic HMIHuman/Machine Interface HPHigh Pressure HSEHealth, Safety and Environment HVACHeating, Ventilation and Air Conditionin IRInfrared kWKilowatt LCPLocal Control Panel LPLow Pressure LVLow Voltage MACManual Alarm Callpoint MCCMotor Control Centre NBNominal Bore PaPascall PA/GAPublic Address and General Alarm PLCProgrammable Logic Controller Shell Nigeria E & P Company Ltd.Unrestricted OPRM-2003-0335Page v of viii 10-April-2006 Refere Refere Refere Reference Information/Supporting Documentation nce Information/Supporting Documentation nce Information/Supporting Documentation nce Information/Supporting Documentation Project Data Project Data Project Data Project Data Document No/Ref Document No/Ref Document No/Ref Document No/RefDocument Title Document Title Document Title Document Title BON-CKT-8GN-G-30016-001Level 1 ALQ Layout BON-CKT-8GN-G-30016-002Level 2 ALQ Layout BON-CKT-8GN-G-30016-005ALQ Layout Side Elevations BON-AME-3GN-B-21301-006-C02 P&ID Water Mist System BON-SHI-008-P-000002-088Aft Water Mist System BON-AME-3GN-B-21301-003-C02 P&ID Water Mist System BON-AME-3GN-B-21301-001-C02 P&ID Freshwater System BON-AME-3GN-B-21301-005-C02 P&ID Potable and Freshwater System Modifications BON-AME-3GN-B-21301-002-C02 P&ID Grey and Black Water System BON-AME-3GN-E-25016-001ALQ Power Distribution Diagram BON-AME-3GN-J-20017-001ALQ Cable Block Diagram Inst, F&G and Telecom BON-AME-3GN-X-70183-080F&G Cause and Effect ALQ Level 1 BON-AME-3GN-F-31583-004Revisions to Existing Heli Skid ALQBON-AME-3GN-F-31583-003ALQ level 2 Fire Zone AQ2BON-AME-3GN-F-31583-002ALQ level 1 Fire Zone AQ1BON-AME-3GN-F-31583-001ALQ HVAC Plant Room Fire Zone AQ3BIPM-05-0072Ancillary Living Quarters Basis of Design AMEC Purchase Order PO0031-01 Hot and Cold Water Circulation Pumps Specifications BON-AME-3GN-F-70183-081F&G Cause & Effect ALQ Level 2 BON-AME-3GN-F-70183-082F&G Cause & Effect ALQ HVAC Plant Room Shell Nigeria E & P Company Ltd.Unrestricted OPRM-2003-0335Page vi of viii 10-April-2006 Vendor Data Vendor Data Vendor Data Vendor Data Vendor Vendor Vendor VendorDocument Number Document Number Document Number Document NumberDocument Title Document Title Document Title Document Title Armstrong Technology P05-016-S6035-01Proposed Arrangement ALQ/HVAC Platform Support Platform Armstrong Technology P05-016-S031-01Support Structure Deck Drains CKT projectsA1-3126-P-07ALQ Water Mist CKT projectsA1-3126-P-01ALQ Freshwater System CKT projectsA1-3126-P-01ALQ Grey and Black Water Systems North Sea Ventilation D-7377-016-06HVAC Control Panel LCP-1782 Test Procedure North Sea Ventilation D-7377-034-06Various Commisioning Procedure North Sea Ventilation D-7377-015ALQ HVAC O&M Manual North Sea Ventilation 7377-PID-001 Sheet 1 P&ID Refrigeration Circuit North Sea Ventilation 7377-PID-001 Sheet 2 P&ID Chilled Water Circuit North Sea Ventilation 7377-PID-001 Sheet 3 P&ID AHU North Sea Ventilation 7377-PID-001 Sheet 4 P&ID Supply & Exhaust Ducting North Sea Ventilation D-7377-004HVAC Control Philosophy North Sea Ventilation D-7377-005Fire Damper Panel Control Philosophy North Sea Ventilation D-7377-002ALQ HVAC Design Philosophy Samsung heavy industries 1385-SFS-WM-001Functional Specification Water Mist System Marrioff Hi Fog O&M Manual Omnipure Sewage Treatment Plant O&M Manual Shell Nigeria E & P Company Ltd.Unrestricted OPRM-2003-0335Page vii of viii 10-April-2006 Omnipure12MXMP-F-01 Sheet 1 and 2FD Marine Sanitation Device 12MXMP UnitOmnipure12MXMP-P-01 GA Marine Sanitation Device 12MXMP Unit Shell Nigeria E & P Company Ltd.Unrestricted OPRM-2003-0335Page viii of viii 10-April-2006 Main Table of Contents Main Table of Contents Main Table of Contents Main Table of Contents Document Status Information Document Status Information Document Status Information Document Status Information Abbreviations Abbreviations Abbreviations Abbreviations Reference Information/Supporting Documentation Reference Information/Supporting Documentation Reference Information/Supporting Documentation Reference Information/Supporting Documentation Part 1Part 1Part 1Part 1 Technical Description Technical Description Technical Description Technical Description Section 1 Section 1 Section 1 Section 1System Overview System Overview System Overview System Overview Section 2 Section 2 Section 2 Section 2System Description System Description System Description System Description Part 2Part 2Part 2Part 2 Operati Operati Operati Operating Procedures ng Procedures ng Procedures ng Procedures Section 1 Section 1 Section 1 Section 1System Operating Procedures System Operating Procedures System Operating Procedures System Operating Procedures Section 2 Section 2 Section 2 Section 2Equipment Operating Procedures Equipment Operating Procedures Equipment Operating Procedures Equipment Operating Procedures Section 3 Section 3 Section 3 Section 3Supplementary Operating Procedures Supplementary Operating Procedures Supplementary Operating Procedures Supplementary Operating Procedures Shell Nigeria E & P Company Ltd. Unrestricted Part 1Technical Description OPRM-2003-0335Page 1 of 110-April-2006 PART 1 TECHNICAL DESCRIPTION Section 1System Overview Section 2System Description Shell Nigeria E & P Compant Ltd. Unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 1 of 810-April-2006 Part 1 Technical Description Section 1 System Overview Table of Contents 1.0INTRODUCTION...........................................................................................................2 2.0PROCESS DESCRIPTION ...........................................................................................2 2.1ALQ and Escape Routes....................................................................................2 2.2Electrical Distribution .........................................................................................2 2.3Hot and Cold Potable Water Distribution............................................................3 2.4Sewage Treatment.............................................................................................3 2.5Fire and Gas Detection......................................................................................5 2.6Fire Protection ...................................................................................................5 2.7HVAC...............................................................................................................5 3.0HEALTH, SAFETY AND ENVIRONMENT (HSE) .........................................................7 3.1General..............................................................................................................7 3.2Specific Hazards................................................................................................7 3.3Environmental Issues.........................................................................................8 Shell Nigeria E & P Company Ltd. unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 2 of 810-April-2006 1.0INTRODUCTION The Ancillary Living Quarters (ALQ) includes the following facilities: Electrical power distributionHot and cold freshwater distribution Sewage treatment Fire and gas detection Fire protection Heating, Ventilation and Air Conditioning (HVAC) 2.0PROCESS DESCRIPTION 2.1ALQ and Escape Routes TheALQislocatedonCdeckatthesternoftheFPSOandhastwolevelswhich provideanadditional56bedsforusewhenextracapacityisrequired,suchas during major maintenance projects. Thebedsareprovidedin14four-mancabinseachwithatoilet,washbasinand shower facility. Also included in each cabin are four lockers a table and chair. Alocker/changingroomislocatedattheentrancetoeachlevel,equippedwith14lockersprimarilyforworkingclothes,abenchandfourshowerunits.AWCandwashbasinareprovidedinaseparatecompartmentattheendofthe locker/changing room. The main access to the corridor on each level is through an airlock on the starboard side of the ALQ. An emergency exit is provided at the opposite end of the corridor. Theairlockandemergencyexitontheupperlevelareaccessedviaasteel staircase. EscaperoutesareprovidedfromtheexitsontheALQleadingtothedesignated muster areas. The routes are marked with suitable signs and a layout showing the routes is provided on each level of the ALQ. 2.2Electrical Distribution ElectricalpowerforprovisionoflightingandoperationofthesewageandHVAC systems for the ALQ is provided at 440V AC 50Hz 3-phase 4-wire supply from the hull power distribution system as follows: SewageTreatmentPlantA1605isfedfromSB-7401B-E-01Cubicle9H, located in the hull emergency switchgear room ALQlowerlevelLightingandSmallPowerDistributionBoardDB-7654-N-01isfedfromSB-7401A-E-01Cubicle12E,locatedinthehullemergency switchgear room ALQ upper level Lighting and Small Power Distribution Board DB-7656-N-01 is fedfromSB-7401B-E-01Cubicle9J,locatedinthehullemergencyswitchgear room HVACPlantRoomNo1PowerDistributionBoardDB-7485-N-01isfedfromSB-7401B-E-01 Cubicle 9G, located in the hull emergency switchgear room Shell Nigeria E & P Company Ltd. unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 3 of 810-April-2006 HVACPlantRoomNo1LightingandSmallPowerDistributionBoard DB-7655-N-01isfedfromNormalPowerDistributionBoardDB-7406-N-01, located in the central equipment room HVACPlantRoomNo1HVACControlPanelisfedfromEmergencyPower SuppliesDistributionBoardDB-7405-N-01,locatedinthecentralequipment room Fordetailsofthepowerdistribution,refertoPOPMVolume30PowerGeneration and Distribution Systems (Hull and Topsides) (OPRM-2003-0330). 2.3Hot and Cold Potable Water Distribution Refer to Part 1 Section 2 Figures 2.1 and 2.2. The hot and cold potable water supplies for the ALQ are provided from the supplies for the main accommodation. To provide cold water for the ALQ at the required rate and pressure the original Cold Water Pumps P-5103A/B have been replaced with higher performance pumps.ToprovidehotwaterfortheALQattherequiredrateandpressure,HotWater CirculatingPumpsP-5102C/Dhavebeeninstalledtoboost thesupplytotheALQ. The pumps take suction from the hot water supply to the main accommodation. For details of the cold and hot water supplies from the hull machinery spaces, refer to POPM Volume 22 Fresh and Potable Water Systems (OPRM-2003-0322). 2.4Sewage Treatment Refer to Part 1 Section 2 Figures 2.3 to 2.5. 2.4.1Black and Grey Water Collection BlackwatereffluentfromthetoiletsintheALQcanflowtoSewageHoldingTank T-1601inthemainFPSOSewageTreatmentSystemortotheOmnipuresewage treatmentunitforsafedisposaloverboardtoMARPOL-approvedstandards.ThemainSewageTreatmentSystemandtheOmnipureunitarelocatedinthe fourth deck of the machinery space. The Omnipure unit is only required to be in service when the ALQ is in use. When not required, the unit will be flushed and isolated. Grey water effluent from the washbasins and showers in the ALQ join the grey water from the other sources on the FPSO and flow directly overboard. For details of the main sewage treatment plant, refer to POPM Volume 17 Sewage Treatment System (OPRM-2003-0317).2.4.2Sewage Treatment Plant The Omnipure Sewage Treatment Plant A-1605 is a self-contained unit which has a capacity to process 28390 litres of black water per day. The unit is required to be in service if the ALQ is in full use.Black water from the ALQ flows into Collection Tank V-1, where it is held until there issufficientblackwatertoallowthetreatmentprocesstobestarted.Asthe treatmentprocessrequiresasteadyflow,thecollectiontankalsoactsasasurge vessel for the system in peak periods. Shell Nigeria E & P Company Ltd. unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 4 of 810-April-2006 When the treatment system is in operation, black water is drawn from the collection tankbyMaceratorPumpM-1,whichreducesthesizeofthesolidmaterialand deliverstheresultingslurrytothebookcell.Flowfromthepumptothebookcellis regulated by a flow orifice. A second line from the pump discharge recycles a portion of the slurry to the collection tank. Flow from the pump to the collection tank is also regulated by a flow orifice. Onthewaytothebookcell,seawaterismixedwiththeslurrytobeusedinthe processperformedinthebookcell.Theamountofseawateraddedtotheslurryis setbyaflowcontrolvalvetosuitthecapacityofthetreatmentsystem.Whenthe treatment process is not operating, the seawater flows to the collection tank. In the bookcell the slurry/seawater mixture flows between electrodes charged with a DC voltage, generated within the package. As the mixture flows between the plates anelectrochemicalreactiontakesplaceintheseawatertoproducesodium hypochlorite. The sodium hypochlorite kills the harmful coliform bacteria and oxidises the organic compoundsinthesewagestream.Onepassthroughthebookcellkillsalmostall harmful bacteria and oxidises between 90 and 95% of the organic compounds. Flowthroughthebookcellisreversibleandisusuallyswitchedaftereachcycleof operation to reduce buildup of material on the electrode plates. ThefluidstreamfromthebookcellflowstoResidenceTankV-2,whichitenters throughalarge-diameterdowncomerterminatingclosetothebottomofthetank. The oversized downcomer reduces the velocity of the fluid stream, thereby allowing gas to be released in the pipe and drawn off by the positive vent ejector system. To prevent foam forming on top of the effluent in the downcomer as gas is released, seawaterissprayedthroughasprayheadinthe topofthedowncomeratarateof 2.5GPM.Thisactionbreaksdownanyfoamtopreventfoambeingdrawnintothe vent ejector.Thepositiveventejectorsystemusesaneductortoremovethegasfromthe residencetankdowncomerusingairasthedrivermedium.Theairissuppliedat 6psig through a regulator from the instrument air supply. Intheresidencetankthefluidisheldforupto30minutestoensurethatany remaining bacteria are killed by the residual sodium hypochlorite in the stream, and to allow settlement of partially oxidised matter. The tank operates as a flooded vessel so that clean effluent leaves through a nozzle ontopofthetank.Theeffluentispumpedoverboardbytheoverboarddischarge pump. Solidscollectedinthebottomoftheresidencetankarereturnedtothecollection tank.Thiscanbeperformedautomaticallyusingtheeductorwiththedrivingfluid providedbythemaceratorpump,ormanuallyusingthemaceratorpumpwith manually realigned suction and discharge. Shell Nigeria E & P Company Ltd. unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 5 of 810-April-2006 2.5Fire and Gas DetectionAlocalfirepanelwithaddressableinputdevicesisinstalledtoprovidecontinuous automatic monitoring of the three fire zones in the ALQ. The ALQ fire zones are as follows: Fire Zone AQ1 ALQ Lower Level Fire Zone AQ2 ALQ Upper Level Fire Zone AQ3 ALQ HVAC Plant Room The fire panel interfaces with the Emergency Support System (ESS) and the Thorne Panel to alert personnel to the presence of a fire hazard, allowing control actions to be initiated manually or automatically to minimise the likelihood of escalation.ThelocalfirepanelmonitorstheALQthroughsmokedetectorsandmanual callpoints.GasdetectionintheALQisperformedbytwopointgasdetectorsintheHVAC intakeairductwhichprovidesananalogueinputtotheESS.Gasalarmsarenot provided on the local fire panel or Thorn fire panel. The ESS performs the necessary executive actions. 2.6Fire Protection The cabins and corridors in the ALQ are protected by a wet pipe water mist system that is activated by heat-sensitive (frangible) bulbs located in the protected spaces. Pressurised water for the system is provided from the aft water mist system. Failureofafrangiblebulbduetofireinitiateswatermistintheeffectedarea.This results in a drop in pressure in the water mist header and the gas driven pumps start to maintain the pressure in the system to produce the water mist. Water for the main accommodation systems is provided from a fresh water cylinder bank.In addition to the water mist system, Hose Reel Units SH-6001R and SH-6001S are installed adjacent to the ALQ and HVAC modules. The hose reels are supplied from the accommodation firewater ring main. For details of the aft water mist system and hose reels refer to POPM Volume 27 Fire Protection Systems and Equipment (Hull and Topsides) (OPRM-2003-0327). 2.7HVAC Refer to Part 1 Section 2 Figures 2.6 to 2.9. The supply air temperature is programmed to be maintained at 15C all year round to maintain comfortable conditions in the ALQ. The controller is located in the HVAC control panel.Thesupplyairisdeliveredataround15Cand80%relativehumidity.Withair supplied to each cabin at 270m3/hr this provides a maximum interior cabin condition of 26C and 40% relative humidity. The spaces in the ALQ are maintained by the HVAC System at a positive pressure ofbetween25Paand65Parelativetotheoutsideatmosphericpressure.Thisis achievedbymanuallyadjustingthepressurecontroldampersontheexhaust from each cabin/locker room during commissioning of the HVAC System equipment. Shell Nigeria E & P Company Ltd. unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 6 of 810-April-2006 The air for the ALQ HVAC is supplied by Air Handling Unit (AHU) A-1785. The two 100% redundant Air Conditioning Units (ACUs) in the AHU take their supply air from a common inlet duct located on top of the HVAC module. AirisdrawnintothedutyACUthroughasharedfilter/coalescerassembly,which removes water and dirt from the air stream before it flows to the duty ACU. Air flow intobothACUscanbeautomaticallyshutoffbyacommonfiredamperinan emergency situation.Twogasdetectorsandtwosmokedetectorsarepositionedinthecommonintake duct downstream of the fire damper and provide input to the ESS shutdown logic. OnenteringeachACU,theairisfilteredandthencooled,againstwaterfromthe associated chilled water system, in a cooling coil before entering the suction of the fan. The cooler reduces the water content of the air stream, with water condensing outoftheairstreamatthecoolingcoilcollectedinatraybelowthecoolerand flowing to drain. TheairleavestheACUfanthroughanon-returndamperandflowsthroughan electricheaterbeforeflowingtotheairdistributionducts.Thecombinationofthe cooler coil and the heater provides a reduction in the humidity of the conditioned air flowing to the ALQ spaces.TheHVACcontrolpanelmonitorsthehumidityoftheairenteringtheALQand energises the heater to reduce the humidity when it exceeds a set threshold. The conditioned air leaves the AHU and flows into the distribution ducts of the ALQ through a sound attenuator. A typical cabin is supplied with air through a termination unit located in the ceiling of the living space at 270m3/h and leaves through a pressure relief damper located in thewetareaassociatedwiththecabin. Theinletandoutlet foreachcabinis fitted with a fire damper. Locker rooms are similar to the cabins but have a higher flow of 300m3/h. EachcorridorintheALQissuppliedwithairthroughaconstantvolumevalveand grillatoneendandtheairleavesthroughapressurereliefdamperlocatedinthe opposite end of the corridor. The air inlet and outlet for each corridor is fitted with a fire damper. All of the air outlets on the ALQ are fitted with an attenuator. The HVAC plant room for the ALQ is also supplied with air from the AHU at a rate of 400m3/h through a manually set volume control damper. 2.7.1Chilled Water Systems Thetwochilledwaterunits,eachdedicatedtoanACU,arelocatedintheHVAC plant room module adjacent to the ALQ. IneachACU,thechilledwateriscirculatedbyachilledwaterpumpthattakes suctionfromtheoutletofthecoolingcoilanddeliversthereturningwatertothe evaporator of the associated chiller unit.A modulating three-way valve is located on the chilled water return from the cooling coilwhichbypassessomeofthechilledwateraroundthecoolingcoiltoprovide temperature control of the air leaving the AHU. The chilled water loop has a 200-litre accumulator to allow for volume changes due to temperature in the loop. Shell Nigeria E & P Company Ltd. unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 7 of 810-April-2006 Coolingofthecirculatingwaterisperformedbyarefrigerationunitlocatedinthe plant room with the air cooled condensers and liquid receivers located externally on the side of the HVAC module. 3.0HEALTH, SAFETY AND ENVIRONMENT (HSE) 3.1General The ALQ and HVAC module are located on C deck at the stern of the FPSO. All personnel accommodated or working in the area must have received training in, and be fully conversant with, the following: Location and use of fire and safety equipment in the area Recognition and response to all the vessels visual and audible alarms Muster and evacuation procedures Escape routes Location and use of lifesaving equipment 3.2Specific Hazards 3.2.1Electrical Power Distribution The electrical power distribution facilities distribute LV power to the ALQ. Electrical personswiththerequiredtechnicalknowledge,trainingandcompetency,ableto recogniseandattempttopreventdangerousactivitiesandtreatanyinjuries,are allowed to work on or with such systems unsupervised. Less qualified persons may work on electrical systems under strict supervision. 3.2.2Hot and Cold Potable Water Distribution Thehotandcoldpotablewatersystemhandlesfreshwateratlowpressure. Therefore, hazards are low compared with other processing systems. However, it is incorrect to assume that no hazards exist. This system cannot be taken for granted just because it usually contains water alone. The hot and cold potable water system employs various items of rotating equipment, which must have all moving parts securely guarded at all times. 3.2.3Sewage System The sewage system operates mainly at low temperature and pressure and hazards are low compared with other processing systems. However, the sodium hypochlorite generatedwithinthebookcellsshouldbetreatedwithcaution.Hydrogenisa byproduct of the process within the bookcells. All personnel must wear the appropriate protective clothing (overalls, safety helmet, gloves, gogglesetc)wheninthearea,andhearingprotectionifnoiselevelsinthe area are high. The sewage system employs some items of rotating equipment, which must have all moving parts securely guarded at all times. Shell Nigeria E & P Company Ltd. unrestricted Part 1Section 1System Overview OPRM-2003-0335Page 8 of 810-April-2006 3.2.4Fire and Gas Detection System The level of access to the fire and gas detection system within the ESS is controlled by keyswitch to reduce the risk of unauthorised changes to the configuration of the system.Changestothesystemshouldonlybeperformedbyauthorisedpersons only to avoid the loss of protection provided by the ESS. Facilities are provided in the ESS to bypass or inhibit safety devices providing input tothesystem,suchasfireandgasdetectors,andtooverrideoutputsfromthe system logic. The use of bypasses, inhibits and overrides must be closely controlled tomaintainthefunctionalityofthesystemandensureitiscapableofproviding protection at all times. 3.2.5HVAC TheHVACSystememploysitemsofrotatingequipment,whichmusthaveall moving parts securely guarded at all times. The fans in the AHU must be electrically isolatedbeforeenteringthefanchambersbecauseofdangersassociatedwith rotating machinery. RefrigerantR407Cisusedinthissystemandmaybepresentundercertainfault conditions. Due care must be taken when handling the refrigerant R407C, or in circumstances where it is possible to come into contact with it. Information on the properties of the refrigerantcanbefoundinthechemicaldatasheetthataccompaniesallmaterials coming onboard the platform. TheAHUairintakeis fittedwithsmokeand gasdetectors. Thedetectorsinterface withtheESSwhich,ifactuated,raiseaplatformgeneralalarmandinitiatethe necessary executive actions, including closure of the AHU air intake and cabin inlet and outlet fire dampers. The ESS initiates an alarm and executive actions as per the F&G Cause and Effect Chart.Theairintakeissuitablylocatedtominimisethepossibilityofingressofair containing smoke, toxic and flammable gases. A reasonable distance separates air inlets from extract outlets discharging from hazardous areas. 3.3Environmental Issues Thesewagetreatmentplantisdesignedtomeetorexceedthestandardsofthe International Convention for the Prevention of Marine Pollution from Ships 1973 as modifiedbytheProtocolof1978(MARPOL73/78), therebyensuringallsewageis processed to the required standard prior to overboard disposal. TherefrigerantR407usedinthechilledwaterunitintheHVACSystemis non-ozone depleting. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 1 of 3310-April-2006 Part 1 Technical Description Section 2 System Description Table of Contents 1.0INTRODUCTION...........................................................................................................2 2.0EQUIPMENT DESCRIPTION........................................................................................2 2.1Ancillary Living Quarters Structure.....................................................................2 2.2Electrical Distribution .........................................................................................3 2.3Potable Water Distribution .................................................................................3 2.4Sewage Treatment Plant....................................................................................4 2.5Fire and Gas Detection......................................................................................7 2.6Fire Protection ...................................................................................................8 2.7HVAC System..................................................................................................10 3.0CONTROL AND INSTRUMENTATION.......................................................................17 3.1Sewage Treatment System..............................................................................17 3.2HVAC System..................................................................................................19 3.3Fire and Gas Detection....................................................................................24 TABLES Table 2.1 Refrigeration Chillers Relief Valves....................................................................17 Table 2.2 Chiller Unit Pressure Switches...........................................................................24 FIGURES Figure 2.1 Hot and Cold Potable Water Supplies from Hull ...............................................25 Figure 2.2 ALQ Hot and Cold Potable Water Supply and Return.......................................26 Figure 2.3 ALQ Black and Grey Water ..............................................................................27 Figure 2.4 ALQ and Main Accommodation Sewage Treatment Facilities...........................28 Figure 2.5 ALQ Omnipure Sewage Treatment System ....................................................29 Figure 2.6 Refrigeration Chiller Units.................................................................................30 Figure 2.7 Chilled Water Circuits .......................................................................................31 Figure 2.8 ALQ AHU.........................................................................................................32 Figure 2.9 ALQ Levels 1 and 2 HVAC Supplies.................................................................33 Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 2 of 3310-April-2006 1.0INTRODUCTION TheAncillaryLivingQuarters(ALQ)hasbeeninstalledonCdeckoftheFPSOto make extra accommodation available during periods of high-maintenance activity or during construction projects when the demand on accommodation is high. Asfaraspracticable,theutilitiesandsafetysystemsrequiredbytheALQare providedfromtheutilitiesprovidedforthemainaccommodationwithsomeminor modifications which are described in other volumes of the POPMs. However, it has beennecessarytoprovideaseparateHVACSystemandasewagetreatment facility for the ALQ. Thefollowingparagraphsdescribetheadditionalfacilitiesinstalledtoprovidethe necessary services to make the ALQ habitable. 2.0EQUIPMENT DESCRIPTION 2.1Ancillary Living Quarters Structure Equipment Details Tag No:ALQ Location:C Deck, aft of the main accommodation Overall Dimension:9.94m wide/12.19m long (without airlock) No of Beds:56 (28 per level) No of Cabins:14 (7 per level) No of Locker Rooms:2 (one per level) The ALQ is constructed on two levels, each level having eight modules arranged in two blocks of four, with a corridor providing access to all eight modules. The corridor is closed at one end by an emergency exit and at the other end by a door to allow entrytoanairlock,whichisthenormalentryandexitpoint.Theairlockand emergency exits are located in non-hazardous areas. The external door on the upper level airlock opens onto the stairway, and the lower level airlock opens onto the C deck walkway. TheALQissupportedonaplatformatCdecklevelatthesternofthevessel, the platform support being H60 rated. Alloutside-facingwalls,ceilings, floorsanddoorsareH60rated,whiletheinternal walls ceilings, floors and doors are B15 rated. The emergency and airlock exit doors are hinged and open outwards in the direction ofescape.Doorsonthecabins,whichallowaccesstothecorridor,openintothe cabins so as not to obstruct corridor egress from the ALQ.The door to the washroom in each cabin has a grill in the lower section to allow the flow of ventilation air from the cabin through the washroom to the exhaust grill. TheHeating,VentilationandAirConditioning(HVAC)plantroomisalsolocatedonCdeck,adjacenttotheALQ,andiscomprisedoftwomodulesconnectedendto end. Two exits are provided on the plant room both located on the same side of the plant room. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 3 of 3310-April-2006 2.2Electrical Distribution Refer to Power Distribution Drawing BON-AME-3AGN-E-25016-001.DistributionofelectricalpowerforlightingandsmallpowercircuitsintheALQis throughdistributionboardsontheupperandlowerlevels.Thedistributionboards are located on the wall in the locker rooms with the supply cable entering through a H60 cable transit in the external wall. The distribution boards each have a metal casement in which there is a main supply breaker and a row of switches that supply and protect the individual circuits fed from the distribution board. Eachcabinorlockerroomisprovidedwithtwofluorescentlamps,withasingle fluorescentlamplocatedineachwashroom.Theupperandlowercorridorseach have four fluorescent lamps spaced evenly over their length.Batterybacked-upemergencylightsareprovidedateachendoftheupperand lower corridors to illuminate the exits.2.3Potable Water Distribution 2.3.1Cold Potable Water Supply ThecoldpotablewatersupplyfortheALQistakenfromthesupplytothemain accommodation. To meet the additional demand, the Cold Water Pumps P-5103A/B have been replaced with higher performance pumps with a greater head.For details of the new pumps, refer to POPM Volume 22 Fresh and Potable Water Systems (OPRM-2003-0322). 2.3.2Hot Potable Water Supply Equipment Details Tag No:P-5102C/D Manufacturer:DPV/Hamworthy Model:DPV-2-20-0.37 Capacity:2.0m3/hr Suction Pressure:Max 7barg (normal 3barg) Operating Temperature:70C Differential Head:14mlc Motor Rating:0.37kW Refer to P&ID BON-AME-3GN-B-21301-005-C02 and Figure 2.1.ThehotwatersupplyfortheALQistakenfromthehotwatersupplytothemain accommodation.TomeettheALQhotwaterrequirement,HotWaterPumps P-5102C/Dhavebeeninstalledtakingsuctionat3bargfromthehotwatersupply line to the main accommodation. Thepumpisavertical,two-stagepumpdrivenbya0.37kWelectricmotor.The pumpismanufacturedfrom304stainlesssteelandfittedwithceramicaluminium oxidebearings.Containmentismaintainedbetweenthecasingandtheshaftbya mechanical seal. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 4 of 3310-April-2006 2.4Sewage Treatment Plant Equipment Details Tag No:A-1605Location:Machinery Space No 4 Deck Manufacturer:OmnipureModel:12MXMPDimensions (H/W/L):2.26m/1.22m/2.62m Capacity:1.182m3/hr Seawater Requirement:28.4ltr/min Note:Meets IMO and USCG effluent discharge rating. RefertoP&IDBON-AME-3GN-B-21301-004-C02andOmnipureP&IDs12MXMP- F-01 Sheets 1 and 2, and also Figures 2.4 and 2.5.The Omnipure Sewage Treatment Plant A-1605 is a package unit provided to meet the extra demand for black water treatment when the ALQ is occupied. The package is automated and controlled through Local Control Panel CP-1 on the skid. For details of the controls for the Omnipure Plant, refer to Paragraph 3.1. 2.4.1Sewage Collection Tank V-1 BlackwaterfromtheALQisroutedthrougha4incollectionlinetotheOmnipure Collection Tank V-1, entering the tank through a nozzle on top of the tank.The collection tank is an enclosed, rectangular steel tank coated with an epoxy coal tar internal coating, to prevent corrosion.The collection tank is vented to atmosphere via a vent line which joins the line from the main sewage treatment plant, terminating at D deck. The top of the tank can be removedforinternalmaintenanceandinspectionpurposes.Afloatswitchis mounted on the tank to monitor the level in the tank. The sewage leaves the tank through a 3in nozzle in the side of the tank close to the bottomtoflowtothemaceratorpump.Acleanoutpointwitha3innozzleisalso provided at a similar level on the adjacent side to the pump outlet. A 1 1/2in nozzle located above the pump outlet allows recycle flow from the pump to flow back to the vessel through a flow orifice. When the pump is stopped seawater, whichisnormallymixedwiththedischargefromthepump,flowsintothevessel through this nozzle.The level in the tank can be monitored on a level gauge mounted on the tank. 2.4.2Macerator Pump M-1 When there is sufficient sewage collected in the collection tank, the Macerator Pump M-1 is started and sewage is pumped from the tank for processing.Themaceratorsectionofthepumphasonestationarycutterandtworotating cutterspositionedupstreamofthepumpstagetoreducethesizeofthesolidsto between 1/8in and 1/16in. The pump section is a single-stage centrifugal pump with the impeller on the same shaft as the rotating cutters. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 5 of 3310-April-2006 The pump casing is manufactured from silicone bronze and the rotating parts are of stainless steel.Containmentismaintainedbyamechanicalseal,whichispressurisedwithoilto containthecorrosivefluidsbeingpumped. Whenthemaceratorpumpisoperating thesealfacesareprovidedwithaseawaterflush,appliedthroughSolenoidValve EV-3. The seawater removes debris from the faces and also provides cooling of the seal in the event that the pump should run dry. Themaceratorpumpisdrivenat3450rpmthroughaflexiblecouplingbya1.5kW electric motor.Thedischargeofthemaceratorpumpconnectstooneportofthemotorised three-way Valve EV-6. Normally the fluid is directed to the bookcell viaa seawater mixer for processing. The flow to the bookcell and the recycle to the collection tank are set by flow orifice plates FO-1 and RO-1. Energising the motorised Valve EV-6 routes the discharge to the collection tank via an eductor, which is used to blow down the Effluent Tank V-2.Themaceratorpumpcanalsoberealignedtopumpoutthecollectionoreffluent tanks overboard in an emergency. 2.4.3Bookcells TheprocessofsterilisationandbreakdownofsolidmatterinthesewagestreamisperformedinanOmnipure12MXMulti-passBookcell.Inthecellsodium hypochloritesolutionisproducedfromtheseawatermixedwiththesewagebyan electrolytic chemical reaction. The seawater is added to the sewage in a fixed ratio before it enters the cell to provide enough seawater for the chemical reaction. ThebookcellconsistsoftwoPVCmachinedrectangularsections,amovabledoor andafixedbase,whicharehingedalongthelongestsidesotheycanbebrought togetherlikeabook.Arubbersealaroundtheperimeterofoneoftheblocks provides a seal to prevent leakage when the cell is closed.A second rubber seal fits vertically into the door to divide the cell into two separate sections (flowpaths). The two sections are connected at the bottom of the bookcell so that flow can be in either direction. Flowintoandoutofthebookcellisviatwosolenoid-operatedthree-wayValves EV-7A and EV-7B. The valves are controlled by the unit control panel and are used to reverse flow through the bookcell after every cycle of operation to reduce buildup on the electrodes. Theprimaryanodesaretitanium,locatedinthebottomofthebookcelland connected to the positive side of the DC supply from a local powerpack. TheprimarycathodesareofHastelloy,locatedinthetopofthebookcell,and connected to the negative side of the DC supply. There are also 18 bipolar titanium plates in the bookcell, ten in the door and eight in the base. One half of each plate is coated with a dimensionally stable anode coating to act as an anode while the other half is bare titanium to serve as a cathode. Thefourprimaryelectrodesand18bipolarelectrodesformtwoidenticalparallel electrical circuits, each having a primary anode and cathode, and nine bipolar plates which form ten cells in series. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 6 of 3310-April-2006 The first cell in each of the two circuits is formed by the primary anode and cathode sectionofthehighestbipolarplateinthedoor.Thenexteightcellsareformedby theanodesectionandcathodesectionofadjacentplates.Thefinal(tenth)cellis formedbytheanodesectionofthelowermostbipolarplateinthedoorandthe primary cathode. Each of the two circuits is supplied with a current of 25 amps and with a voltage of between 50V DC and 100V DC from the powerpack. When in operation the sewage/seawater mixture flows down between the electrodes through one half of the cell and crosses to the other half where it flows up between the electrodes to the outlet.Thesewage/seawatermixtureprovidestheconductivepathtocompletetheelectriccircuitswithsodiumhypochloriteisproducedfromtheseawaterinthe electrochemical reaction.2.4.4Effluent Tank ThetreatedfluidfromthebookcellflowsintoEffluentTankV-2wherethefluidis degassed, and the solids and liquid are separated. The effluent tank is an enclosed, rectangular steel tank, smaller than the collection tank, coated with an epoxy coal tar internal coating to prevent corrosion. Theeffluententersthetankthroughalarge-diameterdowncomerextendingtothe bottom of the tank which allows the effluent to degass before entering the tank.A conical-type spray head supplied with seawater at 9.5ltr/min is installed in the top ofthedowncomertokeepdownanyfoamformedasthefluidreleasesgasand preventsfoamleavingthroughthepositiveventejectorwhichdrawsthegasfrom the top of the downcomer.Theventejectorisdrivenbyairfromablowertoproduce2in WCofvacuum,and the vent is fitted with a flame arrestor on the vent outlet as the gases releasedwill includesomehydrogenfromtheelectrochemicalreactioninthebookcell.The pressure in the vent is monitored by Pressure Switch PSH-1. Theeffluenttankisalsoventedtoatmosphereviaaventline,whichjoinstheline fromthecollectiontank.Thetopoftheeffluenttankcanberemovedforinternal maintenance and inspection purposes.Thetreatedliquidsfromtheeffluentflowfromthetopoftheeffluenttanktothe suction of the overboard discharge pump for disposal overboard. The solids that collect in the bottom of the effluent tank are pumped out on a daily basis for reprocessing back to the collection tank. This operation is performed either automatically using the discharge of the macerator pump through solenoid-operated Valve EV-6 to drive an eductor or manually by realigning the suction and discharge of the macerator pump. A cleanout point with a 3in nozzle is also provided at the base of the tank. 2.4.5Overboard Discharge Pump Theoverboarddischargepumpisasingle-stagecentrifugalpumpdrivenbya 0.746kW electric motor at 3450rpm. Thepumpcasingandtherotatingpartsarestainlesssteel.Containmentis maintained by a mechanical seal on the shaft.Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 7 of 3310-April-2006 Whenthepumpisoperatingthesealhasaseawaterflushacrossthesealfaces, applied through Solenoid Valve EV-4.The seawater flush removes debris from the faces and provides cooling of the seal in the event that the pump should run dry. Thepumpoperatesinconjunctionwiththemaceratorpumpandhasaflooded suction taking effluent from the effluent tank overflow.Note:Asthepumphas alargercapacitythanthemaceratorpump,the pump may often run dry. 2.5Fire and Gas Detection 2.5.1Fire Detection FireintheALQcabins,lockerroomsandcorridorsisdetectedbyatotalof 20 Addressable Smoke Detectors 8350-SO-AQ3-540 to 549 and 8350-SO-AQ3-552 to561,distributedoneineachcabin/lockerroomandtwoineachcorridor.The smokedetectorsusedintheALQareThornaddrMF901addressablesmoke detectors.Insteadofactingasaswitch,eachaddressabledetector containssmart electronicsthatcantransmit,viaacommunicationsloop,asignalthatisan analogue of the level of smoke sensed by the detector.Themeasuredsmokeconcentrationisconvertedinthedetector fromananalogue value to multiple digital levels, which are then transmitted as digital pulses with other data such as detector type and location to the Thorn control panel and Thorn relay boxviatheintrinsicallysafeJunctionBox83-EF-JB-7002,locatedintheALQ Level 1 locker room.In addition, a fire alarm can be raised manually by operation of one of the four Thorn addrCP920ManualAlarmCallpoints(MACs)8350-MAC-AQ3-550/551/562/563, located one at each exit. The signal routing is the same as for smoke detection. 2.5.2Plant Room Fire Detection FireintheALQHVACplantroomisdetectedautomaticallybytwoAddressable SmokeDetectors8350-SO-AQ3-566/7.ThesmokedetectorsusedintheHVAC plantroomarethesameasthoseintheALQandareconnectedtotheThorncontrolpanelandThornrelayboxviatheintrinsicallysafeJunctionBox 83-EF-JB-7004, located in the ALQ HVAC plant room. This system is connected to the existing addressable Loop K which covers the helideck and living quarters. In addition, a fire alarm can be raised manually by operation of one of the two Thorn addrCP920MACs8350-MAC-AQ3-568/9,locatedoneateachexit.Thesignal routing is the same as for smoke detection. 2.5.3AHU Air Intake Gas and Smoke Detection SmokeintheAHUairintakeisdetectedautomaticallybytwoAddressableSmoke Detectors8350-SO-AQ3-564/5,locatedintheAHUairintakeduct.Thesmoke detectors used in the AHU air intake are the same as those in the HVAC plant room andareconnectedtotheThorncontrolpanelandThornrelayboxviathe intrinsically safe Junction Box 83-EF-JB-7004, located in the HVAC plant room. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 8 of 3310-April-2006 ThepresenceofhydrocarbongasintheAHUairintakeisdetectedbytwoGas Detectors 8341-GD-AQ3-790/1, located in the AHU intake duct. The detectors used areDragerPolytronIRPoint-typeGasDetectors.Thedetectorsarewiredthrough thenon-intrinsicallysafeJunctionBox83-EF-JB-7003totheEmergencySupport System (ESS) Triconex I/O Marshalling Panel J-8323-CP-02, located in the central equipment room. In the ESS the gas detector outputs are voted and the necessary executive actions are initiated by the ESS. 2.5.4Thorn Control Panel A serial link is provided between the Thorn control panel and the Distributed Control System(DCS)toallowinformationtobedisplayedonthecontrolroom Human/Machine Interfaces (HMIs). The voted outputs from the Thorn control panel are cabled into the ESS at the ESS TriconexI/OMarshallingPanelJ-8323-CP-03inthecentralequipmentroomto provide indication on the backup display panel and to initiate executive actions. ForfurtherdetailsoftheThornFireDetectionSystem,refertoPOPMVolume29 PSCS and ESS (OPRM-2003-0329). 2.5.5Public Address and General Alarm System The FPSO Public Address and General Alarm (PA/GA) system has been extended to include the ALQ, through a junction box located in each locker room. The junction box for PA/GA system A is located in the lower locker room and the junction box for PA/GA system B is located in the upper locker room. Thereisatotalof20speakers,oneineachcabinandtwoineachcorridor. The speakersinthecorridorsarearrangedoneoneachPA/GAsystem,the speakers in the cabins are linked to alternate PA/GA systems. TheHVACplantroomhastwojunctionboxes,oneforeachPA/GAsystem,each connecting to one speaker in the plant room. A visual alarm in the form of a flashing beacon for each system is fitted in the plant room due to the high noise levels.2.6Fire Protection 2.6.1Water Mist System Refer to P&IDs BON-SHI-008-P-00002-088 and BON-AME-3GN-B-21301-006-C02, and Marioff Layout Drawing 3126-P-07 Issue C. IntheALQ,WaterMistSectionsS8andS9provideprotectionfortheindividual cabins and locker rooms on the lower and upper levels respectively. The water mist systemisawetpipesystem,whichusetheSectionValves63-ZCV-108and 63-ZCV-109 to provide indication of operation to the ESS.Each cabin/locker room has a single strategically placed sprinkler head, held closed by a frangible bulb, to protect the space. The lower and upper level corridors each have three sprinkler heads. Fordetailsoftheaftwatermistsystem,refertoPOPMVolume27FireProtection Systems and Equipment (Hull and Topsides) (OPRM-2003-0327). Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 9 of 3310-April-2006 Sprinkler Heads ThesprinklerheadsareMarioffType1B1ME6MF10RAfittedatceilinglevel. The device has a single central 2mm nozzle and six 2.5mm nozzles spaced around the conical body, designed to produce a fine mist in the form of a 120-degree cone of spray. Release is by a frangible bulb designed to fail at 57C. Failureofthefrangiblebulbresultsinafreshwatermistbeinggeneratedfromthe affectedheadwithpressureproducedbythepneumaticPumpSM-6301-1-P-02, togetherwithadropinpressurewhichresultsinthestart-upoftheAftWaterMist PumpSM-6301-1-P-01A/BasdescribedinPOPMVolume27FireProtection Systems and Equipment (Hull and Topsides) (OPRM-2003-0327). Section Valves Thesectionvalves,oneperlevel,provideasignaltotheESSaswaterstartstoflowthroughthevalve.IntheESSthesignalidentifieswhichsectionvalvehas sensed flow.When a sprinkler head is operated the differential pressure across the piston in the valve increases and the piston moves against the spring. This movement is detected by a proximity switch. To close the valve, the pressure is equalised across the piston toallowthevalvetobeclosedbythespring.Thisiscarriedoutbyclosingthe manual valve located on the section valve.Atestfacilityisprovidedonthebalancelinefromtheoutlettosimulatewater release from a single sprinkler. 2.6.2Hosereels Equipment Details Tag:Firewater Hosereel Stations Manufacturer:Knowsley SK Ltd Type:Drum Type Model:Dominator Flow Rate:450 litres/min @ 3.5barg Refer to P&ID BON-AME-3GN-B-21301-003-C02. Thetwofirewaterhosereels,SH-6001RandSH-6001S,eachstoring18.3mof 40mmNominalBore(NB)rubberfirehoseandratedfortheshut-offheadofthe firewaterpumps,arelocatedadjacenttotheALQ. Thehosereelsarepositionedto ensure that two hoses can reach any part of the ALQ.Eachhosereelissuppliedfromtheaccommodationringmainandincorporatesan integralvariableorificepressurereducertomaintainhosepressurebelowdefined limits for ease of handling.Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 10 of 3310-April-2006 2.7HVAC System Equipment Details Location:ALQ HVAC Plant Room C Deck Manufacturer:North Sea Ventilation Air Volume:5018.4m3/hr AHU Outlet Static Press:0.8barg AHU Fan Speed:3970rpm Motor Speed:2900rpm Motor Rating:4.5kW Cooling Coil Air Temp:35C in/12C out Heater Air Temp:12C in/15C out Refer to NSV P&ID 7377-PID-001 Sheets 1 to 4.2.7.1Introduction The ALQ HVAC system provides fresh air to the cabins, corridors and locker rooms intheALQandtotheHVACplantroom.TheHVACisasimplesystemthatdoesnotmakeuseofextractsystemsorindividualductheaters.Individualcabin temperaturesareadjustedbychangingtheamountofconditionedairflowingtoa cabin within set limits. Most of the HVAC equipment and controls are located in the modularised plant room locatedneartheALQonCdeck.Themoduleiscomprisedoftwo6.1mby 2.44 squaresectionunitsconnectedendtoend,onecontainingtheAirHandling Unit (AHU), and the second housing the chiller package and control panel. Access panels are provided in the side of the AHU to allow access for maintenance. For details of the controls for the HVAC System, refer to Paragraph 3.2. The HVAC System is comprised of the following major components: Common air intake, including filter/coalescer and fire damper AHU,includingdualairfiltrationunits,aircoolingcoils,ventilationfansets, recirculation and non-return dampers, air reheaters and the AHU common outlet ALQventilationairdistribution,includingsupplyairducting,volumecontrol dampers, inlet and exhaust fire dampers, cabin/locker room supply air terminals, localexhaustpressurereliefdampers,exhaustoutletattenuators,andcorridor supply and exhaust grills ChilledWaterUnitsAandB,includingcirculatingpumps,three-wayvalves, accumulators, refrigeration chillers and air cooled condensers HVAC control panel Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 11 of 3310-April-2006 2.7.2Common Air Intake Refer to Figure 2.8. Filter/Coalescer HCF-1785 The air handling unit common air intake is located on top of the AHU section of the HVACmodule.InsidethemoduletheairpassesthroughFilter/CoalescerHCF-1785,designedtohandleanairflowof1.394m3/sec.Thefilter/coalesceris manufacturedfromstainlesssteelandhasaheavy-dutyhorizontalvane,thena vertical vane weather louvre to prevent rainwater entering the unit directly. Thisisfollowedbyacoalescing/filtersection(withside-withdrawablefilters)anda twin-passverticalvaneeliminatorsectiontoremovewater,saltandanyairborne particles from the incoming airflow. Waterremovedfrom theairstream flowsdownintoacollectiontrayandthentoa deck drain. The coalescing filter provides for salt elimination to 99% at 6 micron (0.05ppm) and solids removal of 95% at 1 micron. Fire Damper HDS-1793A Fire Damper HDS-1793A is located downstream of the filter/coalescer, before the air stream splits to flow to the two parallel air conditioning units. The damper is driven by a Belimo electric actuator that is controlled from the HVAC control panel, but can also be closed by the ESS. Indication of damper status is provided on Fire Damper ControlPanelsJ-8347-AP-01and02,onelocatedinthelockerroomoneach ALQ level. Thefiredamperismanufacturedfromstainlesssteelandhasthreeverticalaction double leaf blades.Whentheactuatorisenergised,thedamperwillopen.Whentheactuatoris de-energised,thedamperisclosedwithin1secondbyareturnspring(withinthe actuator) to prevent smoke or gas ingress. The airflow downstream of the damper is monitored by redundant Smoke Detectors 8350-SD-AQ3-564/565andGasDetectors8350-GD-AQ3-790/791.Onconfirmed fire or gas, the ESS will initiate damper closure. 2.7.3Air Handling Unit A-1785 Refer to Figure 2.8. TheAHUA-1785hastwo100%capacitytotallyseparateairhandlingsystems within the one AHU. The following description is for the A unit as the two units are identical. The tag for the B unit is shown in parenthesis. Air Filtration Units A-1785A(B)-HDS-02 Air entering the system is filtered by a pleated bag filter (600mm square in section) beforeenteringthesuctioneyeofthefan.Thefilterbagmaterialisrotproof, non-hygroscopic, inorganic and incapable of migrating into the air stream. Thefilterelementissupportedinastainlesssteelframeincorporatingamanual shut-offdamperupstreamofthefilterelement,toallowmaintenancetobe performedontheairhandlingsystem.Theshut-offdamperisoperatedbya quadrantthatcanbesecuredinanypositiontoadjustfloworcompletelyshutoff airflow.Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 12 of 3310-April-2006 The differential pressure across the filter is indicated locally at a gauge on the side of the module. Air Cooling Coils A-1785A(B)-CC-01 The Air Cooling Coil A-1785A-CC-01 is a chilled water fin and tube heat exchanger constructedfromcoppertubewithtinnedcopperfins,supportedinstainlesssteel endplates.Thecoilhasadownstreameliminatortoremovecondensatefromthe cooled air stream.Thewateriscollectedinadraintrayandflowstoadeckdrain.Thedraintrayis insulated to prevent condensation buildup on the outside of the tray, which may get intotheairstream.Similarly,thechilledwaterpipestoandfromthecoolercoil inside the unit are insulated. Ventilation Fan Sets A-1785A(B)-K-01 The Ventilation Fan A-1785A-K-01 is a centrifugal flow unit with a double inlet, one oneachsideoftheimpeller.Theimpellerisfabricatedfromcarbonsteelandis designed to be non-sparking by using naval brass where contact between parts may take place.The impeller shaft is mounted in double row ball bearings and driven through a belt drive by a 5.5kW electric motor. Guards are provided for the belts and pulleys. Recirculation Dampers A-1785A(B)-HDS-01 TheelectricallyactuatedRecirculationDamperA-1785A-HDS-01ispositioned between the fan exhaust and inlet.ThisdamperisclosedbytheHVACcontrollogicwhenMannedOperationis selected. Thedamperisopenedtopermit recycleofapproximatelyonehalfof the airflow when Unmanned Operation is selected.Thisprovidesalowervolumeofsupplyairthroughthesystematlowerrelative humidity. Non-return Dampers A-1785A(B)-HND-01 Thegravity,multivane-typeNon-returnDamperA-1785A-HND-01ispositionedon theoutletfromtheventilationfantopreventshort-circuitingofairfromexhaustto inletwhenthefanisshutdownandtheotherfanoperating.Thebladesare supported freely in maintenance-free bushes in a stainless steel frame. Air Reheaters A-1785A(B)-HHT-01 ThefinalelementintheairhandlingsystemisthesmallelectricAirReheaterA-1785A-HHT-01,whichhasaratedcapacityof6kW.Thereheaterlimitsthe humidity of the supply air and is controlled by logic in the HVAC control panel (which monitors relative humidity and temperature through instrumentation on the common ventilation air outlet). In summer, the heater lifts the supply air from 12C and 100% relative humidity to 15C and 82% relative humidity. ThereheateriscomprisedofmineralinsulatedsheathedIncoloy800elements, housed in a stainless steel duct section. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 13 of 3310-April-2006 AHU Air Common OutletAir leaves either of the two air handling systems in the AHU through the supply air attenuatorandflowsthroughinsulatedductingattheentrypointattheALQ.Thetemperatureandrelativehumidityismeasuredatthecommonoutletby17-TE-501and17-AE-501respectivelymountedontheAHUoutlet.Thesignals pass to the HVAC Control Panel LCP-1782. Air is tapped from the AHU outlet through a manually set, volume control damper to provide ventilation, pressurisation and purging of the plant room. The supply air attenuator reduces the sound carried in the ventilation air stream with a minimal backpressure on the air supply.Theattenuatorusesmineralwool,astheacousticmaterial,heldinplaceby perforatedgalvanisedsteelplatesinthestainlesssteelductsection.Migrationof fibresintheairstreamispreventedbyclose-weaveglassclothfittedbetweenthe mineral wool and perforated sheets. 2.7.4Ventilation Air Distribution Refer to Figure 2.9.Supply Air Ducting TheventilationairiscarriedfromtheHVACplantroomtotheALQinletvia316L stainlesssteelrectangularsectionducting,supportedbyaUnistrutsupport arrangement.The ducting is fire rated for H60 and is provided with external thermal lagging with a Insulfrax S mineral fibre blanket held in place by stainless steel sheet cladding. Distribution in the ALQ is by two ducts on each level, each provided with a manually setvolumecontroldampertosharetheairbetweenthefourductstomeetthe individual air requirements. AirsupplytoeachALQcabinandthelockerroomsisthroughanactuatedfire damper and terminal unit. The air leaves through a pressure relief damper, actuated fire damper and attenuator. The corridors are supplied with air via an actuated fire damper grill box at one end and leaves through a pressure relief damper, actuated fire damper and attenuator at the other end.Aconstantvolumevalveinstalledupstreamofthegrillboxespreventssurgesof airflow in the corridor when a door is opened.Ducting within the ALQ is lightweight, spiral-wound galvanised sheet ducting. Supply Ducting Volume Control Dampers Volume control dampers are used to set the flow to the four distribution ducts for the ALQ.Thedampersareofamultibladeconstructionhousedinastainlesssteel framework.Whenfullyopenthedamperbladesdonotprotrudeoutsideofthe housing. The dampers are adjusted by a hand-operated quadrant which can be locked in any position between fully open and fully closed. Theunitsarelaggedexternallytoconserveheatandpreventcondensationinthe ducting. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 14 of 3310-April-2006 Air Inlet and Exhaust Fire Dampers There are two sizes of fire damper used on the ALQ: 125mm by 125mm and 200mm by 100mm. All of the fire dampers have a single blade installed in a stainless steel housing.The spindle on which the blade is mounted is supported in pre-lubricated phospher bronze Oilite bearings. Leakage through the closed damper is reduced by stainless steel,spring-loadedsideseals,andtopandbottombladeanglestops.Theseals ensurethatleakageislessthan0.1m3/secwithadifferentialpressureof 0.102kg/m2. Theactuatorsusedonthefiredampersareelectric-motordriventotheopen position, and closed when the motor is de-energised by a spring incorporated in the actuator. In addition there is a frangible bulb in the actuator that will shatter at 72C, breakingthesupplytothemotorandresultinginthedamperclosingthroughthe actuator spring. Anindicatorisprovidedoneachactuatortoshowtheopen/closestatusofthe damper. ThefiredampersarelaggedwithDarmattjacketstomeettheH60firerating requirement. Cabin/Locker Room Supply Air Terminal Units Ventilation airflow into each individual cabin and locker room is through a supply air terminal unit. Each terminal unit has an adjustable constant volume control damper housed in an attenuated enclosure (to reduce noise) and with an adjustable horizontal outlet grill (to direct the air). The constant volume control handle is on the side of the unit and allows adjustment ofairflowtocontrolconditionswithintheventilatedarea,whilstguaranteeinga maximum and minimum airflow of 175m3/hr and 300m3/hr. Local Exhaust Pressure Relief Dampers Airleaveseachcabinthroughapressurereliefdamperlocatedinthewallofthe washroom.Communicationbetweencabinandwashroomisthroughagrillinthe washroom door. A flame-retardant seal is provided to the back edge of the blade to provide silent operation. Thedampersareconstructedinarectangularframeandhaveasingebladewith openingcontrolledbyacounterbalanceweight,adjustabletoprovidetherequired pressure. Exhaust Outlet Attenuators Theexhaustoutletattenuatorsreducethesoundoftheairleavingeachcabin, locker room or corridor. They are of similar construction to the supply air attenuator butarerequiredtohaveanH60fireratingsotheacousticinsulationisConlit Firebatt which provides H60 protection to the airway passing through. Corridor Supply and Exhaust Grills Airenterseachcorridorthroughahighlevel,wall-mountedgrillviaasupplyduct that penetrates the internal wall from the locker room to the corridor. Each grill has an airflow adjuster to set the flow into the corridor. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 15 of 3310-April-2006 Airleavesthecorridorattheoppositeendthroughahighlevel,wall-mountedgrill located above the last cabin door on the same side as the locker room. The exhaust ducting in the cabin is custom made and powder coated to match the ceiling panels. 2.7.5Chilled Water Units A-1787A and B Refer to Figures 2.6 and 2.7. Chilledwaterproducedbythetwo100%ChilledWaterUnitsA-1787AandBis circulated through the cooling coil for the associated A or B air handling system in AHUA-1785tomaintainthedesiredtemperatureandhumidityoftheairsupplyto theALQ.Theamountofchilledwaterflowingthroughthecoolingcoilineach systemisregulatedbyanactuatedthree-wayvalve,whichismodulatedbythe HVAC control logic. The pumps, accumulators and control valves are part of the chilled water pump set located in the HVAC plant room. ThefollowingdescriptionisforA-1787Aasthetwounitsareidentical.Where required, the tag for the A-1787B unit is shown in parenthesis. The main components of the system are as follows: Circulating Pumps A-1786A(B)-P-01 Three-way Valves A-1786A(B)-MOV-01 Accumulators A-1786A(B)-V-01 Refrigeration chillers and air cooled condensers Circulating Pumps A-1786A(B)-P-01 Circulating Pump A-1786A-P-01 is a single-stage centrifugal pump directly coupled toa3kWelectricmotor.Thepumphasacastironhousinganda304Lstainless steelimpeller.Thepumpisnotself-primingbutispositionedsuchthatitisgravity primedasthecircuitisfilled.Thepumpisprovidedwitha20-micronmesh-type strainer on the suction to protect the pump from damage and erosion should solids enter the circuit. The maximum flow in the loop is set by a factory set flow valve located downstream of the pump. Three-way Valves A-1786A(B)-MOV-01 Three-wayValveA-1786A-MOV-01providesabypasspatharoundtheAHU Cooling Coil A-1786A-CC-01 thereby controlling the amount of chilled water flowing through the coil and hence the cooling capacity of the coil.Thetargetistohaveareturntemperatureof10C.Thevalveispositionedbya linearpositionalactuatorcontrolledbytheHVACcontrolpanel.Onfailure,the valve moves to the full cooling position, ie the bypass is fully closed. Accumulators A-1786A(B)-V-01 AccumulatorA-1786A-V-01isacylindricaltankof200-litrecapacity.Thevessel provides a reservoir buffer for chilled water returning to the chillers.Theextracapacityincreasesthecirculatingvolumetoalevelthatpreventsthe chiller from hunting to maintain a control point due to constant or sudden changes in returning water temperature.Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 16 of 3310-April-2006 Refrigeration ChillersThetworefrigerationchillersaremodelURAC-175DQunitsmanufacturedby Airedale International. URAC indicates that they have remote air-cooled chillers. Therefrigerationpackageisenclosedinacabinet(1.85mhighby2mlongand 0.76mwide)usingR407Castherefrigerant.Theunithasacoolingcapacityof 202.5kW and has a power consumption of around 54.3kW.Thedualrefrigerantcircuitunitscompriseacompactmultiplescrollcompressor chillerunitandastainlesssteelchilledwaterbrazedplateheatexchanger. The chiller cools the circulating water down to 5C. Refrigerationcapacitycontrolisself-containedwithinthechillers.Havingtwo refrigerationcircuitsandparallelcompressorsofdifferentphysicalcapacities,six stages of switched capacity control is achieved.Fine tuning of capacity is by electronic expansion valves, one on each refrigeration circuit.ThepackagehasaProgrammableLogicController(PLC)basedcontrol system located within the cabinet. The chillers have trace heating on the plate heat exchangerevaporatorasameansofsafeguardingagainstliquidmigrationor slugging into the compressors. Air-cooled CondensersThetwosetsofair-cooledcondensersaretheheatrejectionsystemforthetwo refrigerationchillersandincludethecondenserfans,condensercoilsandliquid receivers.The condensers are mounted vertically on the outside wall of the HVAC plant room. For each refrigeration chiller there are two condenser coils, one per refrigerant loop, andatotalofsixelectricmotor-drivenfans,threeinarowdedicatedtoeach condensercoil.Condensedrefrigerantiscollectedintwoliquidreceivers,one dedicated to each condenser coil. Thecondensercoilsarevertical-installed,finnedcoppertubesupportedbetween stainless steel plates. Thecoolingfansblowairthroughthecondensercoils.Eachfanhasanaxial propeller made of Glass Reinforced Plastic (GRP) and is driven by a 1.5kW electric motor. The liquid receiver in each circuit provides a continuous liquid feed to the associated chillers expansion valve, and caters for the varying pressure conditions in the circuit which results from the switched fan heat rejection capacity control. Each receiver is protected by a pair of pressure relief valves as shown in Table 2.1. The condenser fans are controlled through the condenser fan motor control panel in the plant room. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 17 of 3310-April-2006 VesselPSVPSV Liquid Receiver A117-RV-503A17-RV-503B Liquid Receiver A217-RV-504A17-RV-504B Liquid Receiver B117-RV-505A17-RV-505B Liquid Receiver B217-RV-506A17-RV-506B Table 2.1 Refrigeration Chillers Relief Valves 3.0CONTROL AND INSTRUMENTATION 3.1Sewage Treatment System 3.1.1Omnipure Local Control Panel CP-1 TheOmnipureSewageTreatmentSystemA-1605iscontrolledthroughaPLCin Local Control Panel CP-1, mounted on the skid. The control panel also includes the DCpowersupplyforthebookcellandhasaninterfacewiththeDCStoenable remote monitoring of the unit. Thepanelfronthastwoammeters,whichdisplaythecurrentpassingthroughthe twocircuitsinthebookcell,andanemergencystoppushbuttontoshutdownthe unit. An operator interface panel is positioned in the centre of the panel front which allowsoperatorcontrolthroughfunctionkeysandprovidesinformationonasmall display.The function keys initiate the following actions: Off Mode (Key F1)When F1 is pressed the unit is shut down and Off Mode displayed in the mode of operation box on the display. Bookcell in Auto is displayed in the display message box.Also,whilstinOffModeandwiththeHourMeterscreendisplayed,the operator can cycle the bookcell valves by pressing the F4 key. Cell Valves Cycling is displayed in the message box.Hand Mode (Key F2) When F2 is pressed the macerator pump will run for 30 seconds and HandMode displayed in the mode of operation box on the display. Caution Do Not Leave Unit Unattendedisdisplayedinthedisplaymessagebox.Thisfunctionisusedwhen manual blowdown of the effluent tank is performed. Auto Mode (Key F3) WhenF3ispressedAutoModeisdisplayedinthemodeofoperationboxonthe display.Theunitwilloperateundercontrolofthehighandlowlevelswitcheson Collection Tank V-1. Auto Mode Operating or Auto Idle is displayed in the display message box, indicating whether the unit is running or not.If thelevelinCollectionTankV-1isabovethehighlevelalarmswitch,HighTank Level is displayed in the message box.Note:The unit does not shut down on high level. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 18 of 3310-April-2006 Reset (Key F4) F4 is pressed to reset any alarms on the systemHour Meter Screen Thehourmeterscreenshowstherunninghoursforthemaceratorpumpand bookcell, along with current time and date. When the hour meter screen is displayed, the purpose of the function keys changes as follows: Key F1 Main Menu Key F2 Cell OverrideKey F3 Blowdown Key F4 Bookcell Valve Cycle Alarm Monitoring Ifanalarmoccursontheunit,thealarmisimmediatelyindicatedonthecontrol paneldisplayscreen.ThealarmisacknowledgedbypressingF4fromthemain screen.Whentheproblemcausingthealarmiscleared,pressingF4willresetthealarm logic and clear the alarm from the screenThelast50alarmscanbedisplayedfromthemainmenuusingtheDownArrow key. The following functions are monitored to raise an alarm on the local control panel: ThetemperatureinthetwocircuitsinthebookcellismonitoredbyTSH-1and TSH-2 which raise an alarm if the temperature exceeds 39C The current produced for the bookcell in the DC power supply is monitored and initiates an alarm if the electric current exceeds the factory set limitIfthereisadifferencebetweenthecurrentflowingthrougheachofthetwo circuits in the bookcell of greater than 20% for a period exceeding 15 seconds, an alarm is raised If the pressure in the vent from the system exceeds the set point of PSH-1 for a period of 5 seconds, an alarm is initiated Malfunctions of the macerator and overboard pumps, Solenoid Valves EV-7A/B and Motorised Valve EV-6 are also monitored and produce alarms on the control panel. 3.1.2Sewage Treatment System Operation Normal Automatic Operation WhenHighLevelControlSwitchLSH-1onCollectionTankV-1isactivated,the macerator pump and overboard pump are started and the Solenoid Valves EV-3 and EV-4ontheseawaterflushlinestothemaceratorandoverboardpumpsealsare energised to provide water to the seals.The spray head Solenoid Valve EV-1 is also energised to introduce seawater to the spray head in the downcomer of the effluent tank. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 19 of 3310-April-2006 Thesewagedrawnfromthecollectiontankismaceratedandpumpedthroughthe bookcell in the direction determined by Three-way Valves EV-7A and EV-7B on the inlet and outlet of the bookcell.Thebookcellsarealreadyenergisedpriortocommencementofflowsothat treatment starts as soon as the sewage flows. AsthelevelinthecollectiontankfallsandtheLowLevelControlSwitchLSL-1is activated, the macerator and overboard pumps are stopped, Solenoid Valves EV-3 and EV-4 on the flushing water supplies are de-energised and Solenoid Valve EV-1 is de-energised to shut off water to the spray head.The Three-way Valves EV-7A and EV-7B are reversed by the control logic so that in the next operating cycle, flow through the bookcell is in the opposite direction. Effluent Tank V-2 Automatic Blowdown Automatic blowdown of the effluent tank is performed every 24 hours, to pump the sediment from the effluent tank to the collection tank. The operation is performed when the level in the collection tank is low, ie following a treatment cycle. When a blowdown is required, the treatment cycle is stopped and if the level in the collectiontankissufficientlylow,theThree-wayMotorisedValveEV-6onthe maceratorpumpdischargeisenergisedtodivertthedischargeflowtotheeductor and the macerator pump is started.The fluidpumpedbythemaceratorpumpisusedas thedriving fluid,whichdraws the sediment from the bottom of the effluent tank and delivers the combined stream to the collection tank. Blowdown takes place for a period of 1 minute. Whenthetimerexpires,MotorisedValveEV-6isde-energisedandreturnstoits normalsettingandthemaceratorpumpisstoppedandremainssountilthenext treatment cycle is initiated. 3.2HVAC System 3.2.1HVAC Local Control Panel LCP-1872 The ALQ HVAC Local Control Panel LCP-1872 is located in the HVAC plant room. The control panel is PLC based and performs the start and shutdown sequence for the system and initiates a shutdown to protect the equipment system.ThecontrolpanelhousesthemotorstartersforAHUFansA-1785A/B-K0-01and ChilledWaterPumpsA-1785A/B-P-01,andthebreakersforReheatersA-1785A/ B-HT-01. The control panel has an interface with the DCS to provide the following information on the DCS for remote monitoring: System common alarm ALQ lower level pressure low alarm ALQ upper level pressure low alarm Plant room pressure low alarm Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 20 of 3310-April-2006 ThecontrolpanelhasaninterfacewiththeESSwhichprovidestwoshutdown signals with 2-out-of-2 voting to shut down HVAC. Thefollowingindicatorsandcontrols,commontobothairhandlingsystems,are provided on the front panel:Supply Air Temperature Indicator 17-TI-501 Supply Air Relative Humidity Indicator 17-AI-501 ALQ lower level low pressure alarm ALQ upper level low pressure alarm System A and B duty select switch Duty system start button Duty system stop button Accommodation manned/unmanned selector switch Accommodation manned Accommodation unmanned Therearetwoidenticalsetsofindicatorlampsforeachofthetwoairhandling systems,SystemAisontheleftofthepanelandSystemBisontheright.The indicator lamps are as follows System availableSupply fan faultChilled water low flow Chiller faultChilled water pump running Chilled water pump stopped Chilled water pump fault AHU supply fan running AHU supply fan stopped AHU supply fan fault AHU supply heater on AHU supply heater offAHU supply heater tripped 3.2.2Normal Operation and Control TheoperationoftheHVACSystemisperformedbylogicintheHVACunitcontrol panel.AsbothHVACSystemsareidentical,thefollowingcontroldescriptionisfor the A system. The procedure assumes that the ALQ is to be used to accommodate personnel. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 21 of 3310-April-2006 WhentheALQandplantroomfiredampershaveallbeenopenedbytheresetof the ESS, a permissive signal is sent from each individual fire damper control panel totheHVACcontrolpaneltoallowthesystemtobestarted. Thestatus ofthe fire dampers is indicated locally and through status lamps on the damper control panels. TheoperatorthenselectsALQMannedattheswitchonthelocalcontrolpanel.In this mode, the damper, which bypasses some supply air back to the inlet eye of the fan, is closed so that there is no recycle air being used. The operator next selects the duty HVAC Train A or B (A in this demonstrated case) using the switch on the control panel and initiates a start as follows by operating the start pushbutton.(1)AHUFanA-1786A-K-01startsandsuppliesairtotheALQairdistribution system. (2)Whenthefanhasrunuptospeed,sensedbyaspeedswitch,the Refrigeration Unit A-1787A and Chilled Water Circulation Pump A-1786A-P-01 is started and chilled water starts to circulate. (3)Thetemperaturecontrollermonitoringthesupplyairtemperatureadjuststhe amountofchillingbymodulatingThree-wayValveA-1786A-MOV-01onthe cooling coil bypass. (4)If the relative humidityis outside of the set limits, Reheater A-1786A-HHT-01 is energised to raise the temperature sufficient to reduce the supply air relative humidity. (5)ThedifferentialpressureacrossthecoolingcoilismonitoredbyDifferential PressureSwitch17-PDSL-529,whichprovidesasignaltotheHVACcontrol panel.Automatic Changeover IfafaultdevelopsonthedutyAHUwhichrequiresanimmediateshutdownofthe dutysystem,thedutysystemisshutdownbythelogicintheHVACcontrolpanel andthenthestandbysystem,ifavailable,isstartedautomaticallytomaintainthe required conditions in the ALQ. Cooling Control Philosophy The supply air temperature is programmed to be maintained at 15C all year round to maintain comfortable conditions in the ALQ, adjustable in the HVAC control panel.Therearenoindividualheatersintheairsupplytothecabins.However,the temperatureinindividualcabinscanbesetbyadjustingtheairflowthroughthe cabin at the terminal unit in the cabin. Thechillercoolingcapacityisregulatedbysensingthereturntemperatureofthe chilledwaterleavingthecoolingcoilintheAHU.Thistemperaturewillvary dependentuponoutsidetemperature,astheoutsidetemperatureincreasessowill the load on the chiller to provide more cooling and vice versa. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 22 of 3310-April-2006 Unmanned Operation IftheHVACistobeinoperationwhentheALQisunmanned,thisisachievedby selecting ALQ Unmanned on the HVAC control panel.Inunmannedmode,RecycleDamperA-1785A-HDS-01isopenedand approximatelyonehalfofthesupplyairisrecycledbacktothesupplyfaninlet.Thisprovidesalowervolumeofsupplyairintothedistributionsystematalower relative humidity, reducing the load on the HVAC facilities. Note:Thismodeofoperationisautomaticallyenforcedifanenablesignalislost from one of the fire damper control panels. 3.2.3Fire Damper Control Panels J-8347-AP-01/02 The two fire damper control panels are wall mounted and located one in each locker room. The panel provides the power to each of the 18 fire dampers on the level in which it is located.Thepanelprovidesindicationofwhetheradamperisopenorclosedthroughred and green status lamps, arranged in groups by cabin on the front of the panel. EachfiredampercontrolpanelhasahardwiredconnectionfromtheESS,which tripsthefiredamperswhenitisnecessarytodosoinanemergencysituation.The dampers are reset when the shutdown is cleared and the ESS is reset. The damper control panels also provide all fire dampers open and all fire dampers closed signals to the DCS. The all fire dampers open from each fire damper control panel is a permissive for the start-up of the ALQ HVAC system. Other controls and indications provided on the panels are as follows: Power on lamp Normal/test mode selector (key switch) Open/close selector switch (used in test mode) Lamp test button Panel reset Common fault lamp If two dampers in adjacent cabins are detected as being closed by the control panel, the enable signal from the affected damper control panel to the HVAC control panel isremovedandairthroughputoftheHVACSystemisreducedby50%.Thisis achievedbyforcingthesystemintoALQUnmannedMode.Lossofbothenable signals will shut down the AHU. Afacilitytotestthedampersisprovidedoneachpanel.Toperformatest,the normal/test mode switch is selected to test, and the open/close selector switch can be operated to open and close all dampers controlled from the panel. Closure of the dampersintestmodedoesnotaffectthepermissivesignaltotheHVACcontrol panel. However, while test mode is selected, loss of the signal from the ESS will result in closure of the dampers, overriding the position selected by the test facility. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 23 of 3310-April-2006 AthirdfiredampercontrolpanelisprovidedintheHVACplantroomtoprovide similarfacilitiesforthemainairintakefiredamperandthefiredamperontheair outlet from the plant room.3.2.4Locker Room Local Instrument PanelsMountedabovethefiredampercontrolpanelineachlockerroom,thereisalocal instrumentpanelwhichhousestheinstrumentsthatprovidethefollowinglocal indications for the associated ALQ level: Corridor to ambient differential pressure TemperatureRelative humidity In addition there is a differential pressure switch monitoring the pressure difference between the corridor and ambient which initiates the low differential pressure alarm on the HVAC local control panel. 3.2.5Refrigeration Chiller Control PanelsThe Airedale refrigeration units each have a local control panel which performs the automatic control actions for operation of the refrigeration package. Operation of the refrigeration package within preset limits is initiated from the HVAC control panel as part of the start-up sequence.3.2.6Condenser Fan Motor Control PanelThecondenserfanmotorcontrolpaneliswallmountedandlocatedintheHVAC plant room. The panel houses the motor starters for the 12 condenser fans.Onthepanelfront,theoperationalstatusofeachfanisindicatedthroughredand green status lamps. A common fault lamp for the six fans in each of the two chiller packages is also provided. 3.2.7Condenser Fan Pressure ControlsRefer to Figure 2.6. In order to control the pressure in the evaporator, the three fans on each condenser loop are operated selectively, depending upon the pressure in the evaporator, as the loadonthechilledwatersystemvaries.Thepressureonthevapoursideofeach condenserismonitoredbythreepressureswitches,physicallylocatedabovethe condenseraccessdoorintheHVACplantroom,eachswitchcontrollinga condenser fan on the associated refrigeration circuit. Thepressureswitcheshaveanadjustabledeadbandandaresettooperateas follows: Thefirstfanwillstartwhenpressurereaches15bargandwillstopwhenthe pressure falls to 11.5barg The second fan will start when pressure reaches 17barg and will stop when the pressure falls to 13.5barg Thethirdfanwillstartwhenpressurereaches19bargandwillstopwhenthe pressure falls to 15.5barg The switches are assigned as shown in Table 2.2. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System Description OPRM-2003-0335Page 24 of 3310-April-2006 Chiller Unit A-1787AChiller Unit A-1787B Air-cooled Condenser A-1788A-EA-01Air-cooled Condenser A-1788B-EA-01 Refrigeration Circuit 1Refrigeration Circuit 1 17-PS-530A (15/11.5)Fan M117-PS-550A (15/11.5)Fan M1 17-PS-530B (17/13.5)Fan M217-PS-550B (17/13.5)Fan M2 17-PS-530C (19/15.5)Fan M317-PS-550C (19/15.5)Fan M3 Refrigeration Circuit 2Refrigeration Circuit 2 17-PS-530D (15/11.5)Fan M417-PS-550D (15/11.5)Fan M4 17-PS-530E (17/13.5)Fan M517-PS-550E (17/13.5)Fan M5 17-PS-530F (19/15.5)Fan M617-PS-550F (19/15.5)Fan M6 Table 2.2 Chiller Unit Pressure Switches 3.3Fire and Gas Detection Alocalfirepanelwithaddressableinputdevicesisinstalledtoprovidecontinuous automaticmonitoringofthethreefirezonesintheALQ.Thepanelinterfaceswith theESSandtheThornepaneltoalertpersonneltothepresenceofafirehazard, allowingcontrolactionstobeinitiatedmanuallyorautomaticallytominimisethe likelihood of escalation.ThelocalfirepanelmonitorstheALQthroughsmokedetectorsandmanual callpoints. DetectionbyasinglesmokedetectorraisestheaudiblealarmandindicatesFire DetectedSinglelocallyandattheThornfirepanelonly.ThroughtheESS,this situationsoundstheBackupSummaryDisplayPanel(BSDP)audiblealarmand indicatesFireDetectedSingleontheBSDP.Ifthealarmisnotacknowledged fromtheDCSHMIin2minutes,electricalisolationisperformedandthegeneral alarm is sounded. Detectionbytwoormoresmokedetectorsinalooporoperationofamanualcall point raises the audible alarm and indicates Fire Detected Confirmed locally and at the Thorn panel only. Through the ESS, this situation sounds the BSDP audible alarmandindicatesFireDetectedConfirmedontheBSDP.Firedampersare closed, electrical isolation is performed and the general alarm is sounded.Detectionbyadetector fault raisestheaudible alarmandindicatesDetectorFault locally and at the Thorn fire panel and BSDP through the ESS. IftheALQwatermistsystemisoperated,theBSDPaudiblealarmisinitiatedand indicatesWaterMistActuatedonthedelugepanel.ESSexecutiveactionsareas for a confirmed fire. Gas detection in the ALQ is performed by a point gas detector in the HVAC intake air duct which provides an analogue input to the ESS, which performs the necessary executiveactions.GasalarmsarenotprovidedonthelocalfirepanelorThornfire panel. Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System DescriptionOPRM-2003-0335Page 25 of 33 Issue 1.010-April-2006 Figure 2.1 Hot and Cold PotableWater Supplies from Hull Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System DescriptionOPRM-2003-0335Page 26 of 33 Issue 1.010-April-2006 Figure 2.2 ALQ Hot and Cold PotableWater Supply and Return Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System DescriptionOPRM-2003-0335Page 27 of 33 Issue 1.010-April-2006 Figure 2.3 ALQ Black and Grey Water Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System DescriptionOPRM-2003-0335Page 28 of 33 Issue 1.010-April-2006 Figure 2.4 ALQ and Main AccommodationSewage Treatment Facilities Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System DescriptionOPRM-2003-0335Page 29 of 33 Issue 1.010-April-2006 Figure 2.5 ALQ Omnipure SewageTreatment System Shell Nigeria E & P Company Ltd.Unrestricted Part 1Section 2System DescriptionOPRM-2003-0335Page 30 of 33 Issue 1.010-April-2006 Figure 2.6 Refrigeration Chiller Units Shell Nigeria E & P Company Ltd.Unrestricted PART 2 OPERATING PROCEDURES. Section 1System Operating Procedures. Section 2Equipment Operating Procedures.. Section 3Supplementary Operating Procedures Part 2Operating Procedures OPRM-2003-0332Page 1 of 110-April-2006 Shell Nigeria E & P Company Ltd.Unrestricted Part 2 Operating Procedures. Section 1 System Operating Procedures.. Procedure Number PROCEDURE NO 1/001:PREPARATION OF THE ALQ FOR OCCUPANCY PROCEDURE NO 1/002:NORMAL OPERATION PROCEDURE NO 1/003:SHUTDOWN OF THE ALQ WHEN VACATED Part 2Section 1System Operating Procedures OPRM-2003-0335Page 1 of 11 10-April-2006 Shell Nigeria E & P Company Ltd.Unrestricted SYSTEM/EQUIPMENT:ANCILLARY LIVING QUARTERSPROCEDURE NO 1/001:PREPARATION OF THE ALQ FOR OCCUPANCY THE WHOLE OF THIS PROCEDURE MUST BE READ THROUGH AND FULLY UNDERSTOOD BEFORE CARRYING OUT ANY OF THE FOLLOWING ACTIONS. INTRODUCTION This procedure details the operator actions required to prepare the Ancillary Living Quarters (ALQ)foroccupancyfollowingalongperiodoutofservice.Intheprocedureitisassumed that the fire and gas detection, and PA/GA systems have remained in service. It is assumed that the following services need to be restored: Water mist system Hot and cold water systemsElectrical power supplies HVAC Sewage treatmentPRECONDITIONS Supporting Drawings BON-AME-3GN-B-21301-006-C02 P&ID Water Mist System BON-SHI-008-P-000002-088 Aft Water Mist System BON-AME-3GN-B-21301-003-C02 P&ID Firewater Foam System Modifications for ALQ BON-AME-3GN-B-21301-001-C02 P&ID Freshwater System BON-AME-3GN-B-21301-005-C02 P&ID Potable and Freshwater System Modifications BON-AME-3GN-B-21301-002-C02 P&ID Grey and Black Water System BON-AME-3GN-E-25016-001-C02 ALQ Power Distribution Diagram BON-AME-3GN-J-20017-001-C03 ALQ Cable Block Diagram Inst, F&G and Telecom Pre-requisites No work permits are in force which will prohibit any part of this procedure The ESS, fire and