985 22647-r02 installation manual orca offshore part1

8/11/2019 985 22647-R02 Installation Manual ORCA Offshore Part1

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Created by ALFALAVAL Copenhagen

Installation Manual

Fresh Water MakerORCA OffshoreDocument No.: 985 22647 Rev. 02

Project Name :Project No. :

Serial No. :


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985 22647-R02 Installation Manual ORCA Offshore Part1.doc Page 2 of 21

Generally most of the items installed in the ORCA can be found in the equipment,valve or the instrument list in the appendix.

Additionally Part Lists and drawings can also be found in the appendix.

All items on the lists refer to a tag number in the PID.

Equipment, valves or instruments for which Alfa Laval supplies spare parts, canbe found with article numbers in the Spare Parts Manual.

Spare parts for the electrical control panel as well as parts for the separatorvessel which cannot be found in the equipment, valve or the instrument list areincluded separately in the Spare Parts Manual.

When requesting or ordering spare parts from Alfa Laval please always state:

The ORCA serial number

(Please see name plate mounted on the equipment, current front page or footer)Article number & item descriptionTag number (if relevant).

Alfa Laval Service

The Alfa Laval group is represented in all major parts of the world.

DO NOT hesitate to contact your local Alfa Laval Sales Company if you have anyquestions, problems or require spare parts. Find us at www.alfalaval.com

Alfa Laval reserves the right to make changes at any time without prior notice.

Any comments regarding possible errors and omissions or suggestions forimprovement of this publication would be gratefully appreciated.

Copies of this publication can be ordered from your local Alfa Laval SalesCompany.

Published by:

Alfa Laval Copenhagen A/SMaskinvej 5DK-2860 SborgCopenhagen) Denmark

Copyright Alfa Laval Copenhagen A/S.

This document and it content must not be copied, reproduced, transmitted or disclosedto any third party without consent of Alfa Laval Copenhagen A/S.


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Installation Instructions

1

SAFETY INSTRUCTIONS AND WARNINGS 4

1.1

Safety Instructions and Warnings 4

1.2

General Safety Precautions 4

2

ENVIRONMENT DECLARATION 5

3

STORAGE AND TRANSPORTATION 7

3.1

Storage 73.2

Preservation Procedure for control panels 83.3

Preservation Procedure for Solenoid Valves 83.4

Preservation Procedure for Motors 83.5

Preservation Procedure Compressor 9

3.6

Transportation 10

4

PERFORMANCE CRITERIA 11

4.1

Sea water Design water Analyses 12

5

INSTALLATION 12

5.1

Installation description 125.1.1

Electrical Equipment 125.1.2

Seawater Supply 135.1.3

Brine and Seawater Discharge 13

5.1.4

Distillate Discharge 135.1.5

Space Requirements 135.1.6

Ambient Conditions 135.1.7

Vibrations 135.1.8

General Safety Precautions 135.1.9

Scale Inhibitor Dosage Equipment for Feed Water 13

6

SYSTEM DESCRIPTION 14

6.1

System Description 146.2

Working Principle 156.3

Distillate Quality/Salinity 166.4

Main Components 16

6.5

Optional Equipment 18

7

ELECTRICAL SPECIFICATION 19

7.1

Environment conditions 197.2

Local Control Panel (LCP) 197.3

Cabinet 197.4

Power Supply 197.5

Installed Power 207.6

Earting System 20

7.7

PLC 20

7.8

HMI 21


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1 Safety Instructions and Warnings

1.1 Safety Instructions and Warnings

The following symbols in this manual point out safety precautions. It means yourattention is needed and your safety is involved.

Warning

This symbol is used to indicate the presence of a hazard, which cancause severe personal injury if the warning is ignored.

Caution

This symbol indicates the presence of a hazard, which can causeproperty damage if the instructions are not observed.

Note

This type of instruction indicates a hazard, which could causedamage to equipment.

1.2 General Safety Precautions

It is the responsibility of both operator and owner to ensure that all personnelinvolved in the use or operation of this equipment follow all safety instructions.

Read all safety instructions carefully and insist that they be followed by thoseworking with you and for you.

Not following the instructions may cause severe personal injury or damage the

equipment beyond repair.

Do not allow this equipment to be used if it is faulty or the operator does notunderstand the proper use.

Warning

The ORCA is not to be operated in polluted water.The produced water can be unsuitable for human consumption.


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Warning

Noise hazardsUse ear protection in noisy environments.

Crush hazardsUse correct lifting tools.Do not work under hanging load.

Caution

Burn hazardWear gloves to avoid burns by hot surfaces.

Cut hazards

Wear gloves to avoid cuts by sharp edges when handling machinedparts.Wear helmet to avoid cuts by sharp edges when maintaining themachine.

Note

Max. ambient temperature for ORCA is 50CMin. ambient temperature for ORCA is 2C

( if nothing else is mentioned in the Technical Specification)

Always handle the equipment with great care. Take precautions not to damagethe parts during transportation and installation.

Warning

Before start-up: Check that your main supply cable size, voltages,frequency and maximum error current agrees with the electricalspecifications.

Warning

Before start-up: Check that all connections are properly earthed(grounded) in accordance with local regulations, and properlyisolated.

2 Environment Declaration


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Type:ORCA freshwater generator

Manufacturer:Alfa Laval Copenhagen A/S, Maskinvej 5, 2860 Sborg, Denmark

Product:ORCA Offshore

Production site:Alfa Laval Copenhagen A/S, Maskinvej 5, 2860 Sborg, Denmark

Local environment legislation or regulation to consider:The ORCA must be installed and operated with respect to any local environmentlegislation. It is the purchaser / owner of the ORCA responsibility to follow anylegislation or regulation.It is the purchaser / customers responsibility to make sure that all necessary

approval from the environmental authorities is obeyed, before installing andoperating the ORCA.

Handling of waste:In relation to maintain the ORCA, it is necessary to dispose cip-, dechlorination-and anti scale fluids and oil-soil from the compressorAll waste shall be stored in safe approved containers and be handled anddisposed after the local environmental regulations.

Handling of hazardous materials:Cip-, dechlorination- and anti scale fluids shall be stored in safe approved

containers before and after use. All handling of hazardous materials shall takeplace after present local environmental regulations. Schemes for correct dosingchemicals are located under the Feed Water Treatment section in this manual.

Noise:The ORCA has a noise emission of maximum 81dBA. It is necessary to use earprotection when operating the ORCA.

Discharge of process water:The salinity in the process water from the ORCA can have an impact on the localenvironment if it is channelled into the ground or areas near freshwater. If the

ORCA is placed offshore, the process water is harmless when it is lead back tothe sea. It is the purchaser / customers responsibility to make sure that theORCA installation has no impact on the local environment.

Emission to air:There is no emission to air from the ORCA.

Risk of soil and ground water pollution:Following the instructions in this manual, there is no risk for soil and ground waterpollution.

Disassembling and disposal of the ORCA:Disassembling and disposal of the ORCA shall be executed after the presentlocal environmental regulations regarding all separate materials.


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3 Storage and Transportation

3.1 StorageAlfa Laval standard packing(seaworthy) is suited for transportation and for up to 6months indoor storage in a vibration free area at a temperature ranging between

15 to 45 oC (59 to 113 oF) and with a humidity around 70%. For crate storage upto 8 months from date of delivery it is only necessary to check the crate forexternal physical damage and view humidity levels at two weeks intervals.

Records of date for inspection and results shall be maintained.

Should the humidity level be high it can be assumed that the bag is breached.The crate should be opened desiccant replaced and the bag evacuated and re-sealed. For security the crate should be re-closed.

Should it be necessary to remove the original packing for pre-commissioning, the

following should apply for up to six months prior to commissioning.

Turn rotating equipment by hand once per week leaving in a different restingposition.Keep equipment protected against rain, dust, sand etc. stored under a securedpolythene sheet.Repair paints damage promptly.Change electrical desiccant once per month.Permanently energise anti-condensation heaters for electrical equipment.Post notice prohibiting climbing or abuse of equipment.

In the event of physical damage or queries contact Alfa Laval Copenhagen.

There are no lubrication requirements for the equipment during storage.

Releasing of flanges and unions shall be permitted for draining low and deadparts of the system.

Note

There should ABSOLUTELY NOT be any OZONEPRODUCINGequipment in the room, like operating electric motors or arc-welding,

since ozone destroys many rubber materials.

Do not store organic solvents or acids in the room.

Avoid heat and ultraviolet radiation.

The Alfa Laval standard packing is NOT suited for outdoor storage, Alfa Lavalcan therefore not be held responsible for any damage to the ORCA under theseconditions.In case it is needed to unpack the ORCA the yard is responsible for protectingthe equipment as Alfa Laval can not be held responsible for any damage whenstored under these conditions.


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3.2 Preservation Procedure for control panels

The panels have to be disconnected from the main supply and kept clean and dryduring the long-term standstill period.

The panel is kept dry inside either by an anti-condensation heating element or byuse of a desiccant.

Warning

If anti-condensation heater is used, prominent warnings of liveterminals inside the panel must be posted inside and outside thepanel.

The electric panel normally includes motor starters with thermal relays,transformer, contactors and salinometer.

Remove the salinometer sensor in the distillate pipe after the distillate pump,clean the sensor and store it in the electric panel or in a dry place.

3.3 Preservation Procedure for Solenoid Valves

The solenoid valves and the associated on/off valves should be activated every 6months with the normal operating air pressure. The valves are operated using thecontrol switches on the relevant control panel.The solenoid valves should be removed, flushed with warm freshwater andstored in a clean dry ozone free area.Before replacing, the valves should be flushed again with warm freshwater and

the valve functions are to be checked by energising the coil.

3.4 Preservation Procedure for Motors

Factory fitted bearings use a lithium-based grease with a recommended shelf lifeof two years. If stored for a longer period, grease may need to be replaced.

Shielded bearings have a storage life of five years and a further two yearsoperational life following the installation.

To avoid static indentation during long term stand still, the area should be

vibration free.

Where exposure to some vibration is unavoidable, the shaft should be locked.Roller bearings may be fitted with a shaft-locking device, which should be kept inplace during long term stand still.

Shaft should be rotated by hand, one quarter of revolution weekly.


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Warning

Where anti-condensation heaters have been fitted, it isstrongly recommended that they are energised.

In such case, prominent warnings of live terminals insidethe terminal box must be posted inside and outside themotor terminal box.

Where anti-condensation heaters are not fitted, the use of desiccant isrecommended.

3.5 Preservation Procedure Compressor

Remove the belt and store it in a clean dry ozone free area.

Turn the compressor rotor twice a week.

Stuffing boxes, shaft passages at shaft seals should be wrapped in Denso-Bindings (wax-permeated Jute bindings). The running surfaces and bushingsshould be coated with Molycote.

Labyrinth shaft seals must be treated with long-term protective material such asTectyl No. 505.

Anti-corrosive wax should be applied to the running surfaces on the pulleys.


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3.6 Transportation

All transportation of the ORCA must be in accordance with local regulations.

Always handle the equipment with great care. Make sure not to damage the partsduring transportation.

After transportation the crates should be visually inspected for physical damage.In the event that the packing is damaged the following action shall be taken:

Remove sufficient packing to verify that there is no physical damage to thegoods.On finding no damage replace and repair packing.

In the event of physical damage to the goods Alfa Laval Copenhagen inspectionshall be requested.

Any damage to paint shall be repaired promptly in accordance with the approvedpaint repair procedure.

The ORCA must be lifted using the lifting points indicated on the ORCA, hookedwhere the following label is placed:

Warning

The ORCA is very heavy. Lifting the ORCA or parts therefore maybe hazardous to personnel.

Ensure that safe working load of the lifting equipment is sufficient tolift the ORCA.

Remember to lift simultaneously at all lifting points indicated toensure an even load.

Warning

Make sure that the lifting equipment has the required breaking

strength to lift the unit. See weight in General Arrangement drawing.


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4 Performance criteria

The desalination system has been designed according to the parameters outlinedin the end of the installation manual; however, the performance of the system isalso subject to the following criteria:

a) Raw water supply shall be seawater with a concentration of no more than3.5%, unless otherwise stated. The seawater shall be pre-filtered by thecustomer to remove suspended solids larger than 0.5 mm. Further, the seawaterused shall not contain pollutants, such as oil, fat, detergents, organic matters,micro-organisms, algae, humic matter, mud, clay, sand, etc. Generally the al-lowance of such undesirable matter shall not surpass content in the raw watersupply that results in a fouling factor of the heat transfer surfaces higher than15% of the normal practice within international desalination engineering practice.Moreover, the seawater supply shall not contain corrosive substances or gasessuch as H2S, free Chlorine, Fluorine, etc. higher than stated in the specificationor other substances, which can alter the physical-chemical properties of the raw

water.

b) Supply of Utilities and consumables such as: Air, electric power shall beprovided on a constant basis and at the values for voltage, Phases andFrequency required and specified in this quotation, and not presentingfluctuations of more than 5 %.The pre-treatment chemicals shall be dosed in the correct amount and typerecommended by Alfa Laval. The raw water shall be supplied constant andwithout variations at the required flow and pressure.

c) The equipment shall be properly operated in accordance to the instruction

manuals provided by Alfa Laval for this purpose. Critical parameters shall be keptwithin the design values for: flows, pressures, temperatures, chemicals dosage,evaporating temperature, water recovery factor, maximum allowed brineconcentration etc. plus proper observance of the maintenance proceduresincluded in the manuals. Recording of the operation parameters plus writtenlogging of the preventive and corrective maintenance will be the only validdocumentation for evaluation of performance of the equipment delivered.Improper physical handling of the equipment and components will causeimmediate invalidation of guarantees of performance.


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4.1 Sea water Design water Analyses....................TSS ............. < 2,00 p.p.m. (mg/l)pH ............... 8,26TDS ............ 35.175,00 p.p.m. (mg/l)Calcium Ca++ 408,1 p.p.m. (mg/l)MagnesiumMg++ 1.297,50 p.p.m. (mg/l)Sodium ...Na+ 10.767,80 p.p.m. (mg/l)Potassium K+ 387,6 p.p.m. (mg/l)Barium ... Ba+ 0 p.p.m. (mg/l)BicarbonateHCO3 - 142,5 p.p.m. (mg/l)Chlorides Cl - 19.360,50 p.p.m. (mg/l)SulphatesSO4 - 2.701,70 p.p.m. (mg/l)Fluoride ....F - 1,3 p.p.m. (mg/l)Bromium Br - 65,9 p.p.m. (mg/l)Iridium ....... I - 0,05 p.p.m. (mg/l)

Silica ....SiO2 2,4 p.p.m. (mg/l)....................Spec. densityy at 20 oC 1.024.0 kg/m3...................

Ref. Standard Sea Water according to OSW 3

Note: The seawater supplied shall, by proper design of seawater intake andproper filtration be free of impurities, such as mud, clay, silt, algae etc. whichcould cause fouling and/or blockage in the unit.

5 Installation

5.1 Installation description

The ORCA is delivered as a unit that can be either bolted or welded to the floorplate. See attached Foundation Plan drawing.When the Fresh Water Maker is complete and fastened to the floor plate allterminal points shall be connected to supply seawater, service water, instrumentair and electrical power. Secure free access for discharge of drain water anddistillated water.

The terminal points for hook-up are detailed on the general arrangement drawing

and on the P&IDs. The hook-up does not require the presence of Alfa Lavalpersonnel.

5.1.1 Electrical EquipmentA control panel with starters for electric motors is delivered mounted on the units.

Check all connections and cables to make sure that the frequency and voltageagrees with the electrical specifications

Check that all connections are properly earthened (grounded) in accordance with

local regulations, and properly insulated.

All electric installations must be carried out by a professional electrician in fullaccordance with local regulations.


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5.1.2 Seawater SupplyThe seawater supplied to the unit has to pass a filter (customer supply) in the seawater line before the feed water line and ejector pump.Please refer to the P&IDs for recommended pipe dimensions.

5.1.3 Brine and Seawater DischargeThis line is and open line.Please refer to the P&IDs for recommended pipe dimensions

5.1.4 Distillate DischargePlease refer to the P&IDs for recommended pipe dimensions

5.1.5 Space RequirementsThe space requirements are indicated on the service area drawing of the ORCAunit. See attached service area drawing.

5.1.6 Ambient ConditionsWhen determining where to place the ORCA, consideration must be paid to anumber of ambient conditions such as vibrations, service space, allowable backpressure, and pressure loss.

5.1.7 VibrationsThe ORCA cant be placed in an area known to be subject to frequent and highvibrations.

However, under normal conditions no further precautions are necessary.

5.1.8 General Safety PrecautionsAlways handle the ORCA with great care. Make sure not to damage the partsduring transportation or installation.During erection all inlets and outlets must be covered to be protected from dirtand particles.

5.1.9 Scale Inhibitor Dosage Equipment for Feed WaterThe Anti scale tank with pump and safety valve shall be positioned max. 2 mfrom the ORCA.Fittings and hose is supplied with the tank. Installation is to be done by Yard.


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FreshWaterTo

Tank

Brine

Overboard

SeawaterFrom

Sea

Seawater

Overboard

Compressor

8

7

6

3

2

5

9

10

13

14

4

Condenser

Evaporator

11

12

1

6 System Description

6.1 System Description

1. Vent condenser2. Circulation pump3. Brine pump4. Compressor

5. Air ejector6. Distillate pump7. Brine heat exchanger8. Distillate heat exchanger

9. Electrical heater10. Filter11. Sight glass

12. Filter13. Evaporating chamber14. Condenser chamber


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6.2 Working Principle

Numbers in the text below refer to the drawing above:

Seawater is supplied to the ORCA where it is divided into two streams, one as

feed water and one as jet water for the ejector (5). The feed water stream isdivided into two equal streams to the plate heat exchangers (7, 8). One streampasses through the distillate / feed water pre-heater (8) and the other streamthrough the brine / feed water pre-heater (7). The ingoing feed water is heated inthe plate heat exchangers by the outgoing brine and distillate flows obtainedduring the process.

After the pre-heaters, the feed water stream from the distillate cooler is ledthrough a vent condenser (1) into the evaporation chamber (13).

In the vent condenser the temperature of the feed water is increase slightly. This

is caused by condensing vapour and the cooling down of the non-condensablegasses vented to the atmosphere by means of the Ejector (5).

The other stream is led directly into the evaporation chamber (13) where it ismixed with brine. Approx. 90% of this blended mixture is circulated by thecirculation pump (2) and discharged into the evaporator/condenser forevaporation. The remaining 10% is extracted by the brine pump (3) and ledthrough the brine / feed water pre-heater (7) in order to heat up the incoming feedwater, and then finally discharged overboard.

The blended feed and brine flow, circulated by pump (2), is discharged into theevaporator where it flows through the distribution channels of the plates anddown in an even and controlled falling film. While flowing down, the brine film isheated up and partially evaporated by the heat obtained from the condensationof vapour on the other side of the plates. The released vapour in chamber (13) isthen sucked through a demister by the centrifugal vapour compressor (4) whichcompresses the vapour and thereby increases its temperature with approx. 3-5C. The vapour is then led back into the condensation chamber (14) where theevaporator/condenser plate stack is situated. Here the vapour condenses intopure distillate yielding its latent heat and thereby evaporating the brine on theother side of the plates.

The distillate produced in the condenser is extracted by the distillate pump (6)which pumps it through the distillate / feed water pre-heater (8) in order to heatup the incoming feed water, and then to the storage tank.

The evaporation process normally takes place around 75C. The evaporationeffect is done at sub-atmospheric conditions, where the vacuum is created bymeans of the ejector (5), which initially evacuates the air from the system, andafterwards maintains the vacuum by extracting the non-condensable gases andventing them to the atmosphere.

The electrical heater (9) is primarily for starting up the process.


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6.3 Distillate Quality/Salinity

To continuously check the quality of the produced distillate, a salinometer(measuring conductivity) is provided together with an electrode unit fitted on the

delivery side of the distillate pump.

If the salinity of the produced distillate exceeds the chosen maximum value, thedump valve and alarm are activated to automatically dump the produced water toopen drain.

If there are no special requirements from the authorities, the produced distillatecan be used directly as drinking water. Otherwise the distillate should be post-treated in suitable equipment.

6.4 Main Components

The ORCA consists of the following main components:

1. Evaporator/Condenser sectionThe evaporator/condenser section consists of a titanium plate heat exchangerand is mounted inside the separator vessel. It generates the distillate byevaporating the feed water on one side of the plate and condensing it on theother. The evaporator and the condenser section are internally separated with apartition plate.

2. Feed water pre-heatersThe pre-heaters are two titanium heat exchangers (one brine cooler and onedistillate cooler) where the incoming feed water is pre-heated by the excess heatobtained during the process in the outgoing brine and distillate flows.

3. Separator vesselThe separator vessel is made by stainless steel and contains the plates as wellas other interior construction parts. Further anodes are mounted in the vessel.

4. Air ejectorThe ejector evacuates the air to create vacuum inside the vessel. During

operation, the ejector maintains the vacuum by extracting the non-condensablegases from the separator vessel. Maximum backpressure at seawater outlet isnormally 0.6 bar g, due to the performance of the Air Ejector.

5. Brine pumpThe brine pump is a single-stage centrifugal pump. The brine pump extracts partof the brine from the bottom of the vessel to ensure a constant brine level andconcentration, and pumps the water through the brine/feed water pre-heater todischarge. The brine discharge is internally connected to seawater outlet.

6. Distillate pump

The distillate pump is a single-stage centrifugal pump. The distillate pumpextracts the produced distillate from the vessel and pumps the water through thedistillate/feed water pre-heater to a tank or post treatment equipment, if any.


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Normally discharge pressure at is 0.6 bar g. (If nothing else is mentioned in thetechnical specification).

7. Circulation pumpThe circulation pump is a single-stage centrifugal pump. The circulation pump

circulates the brine/feed water mixture into the evaporator/condenser to ensure aconstant flow of feed water to the evaporating channels in the plate stackAs the brine is heated as part of the process inside the plate heat exchanger inthe vessel, its latent heat is used to pre-heat the cold incoming seawater.

8. Control panel / HMIThe control system is for operating monitoring the ORCA unit. This includesstarting up and stopping components as well as the continuous monitoring ofORCA performance.The panel contains of motor starters with thermal relays, running lights,salinometer, as continuously checks the salinity of the produced water. Besides

of the PLC and HMI, where all action and monitoring of performance andparameters are performed. The ORCA is entirely operated from the touch panelon the HMI.

9. Electrical heaterThe electrical heater is primarily used for starting up the process and willautomatically shut off when the process is on its specified values. The electricalheater also switches on during actual operation, if the heat exchangertemperature falls below adjustable set points.

10. Vapour compressorThe vapour compressor is a single-stage centrifugal vapour compressor. Thecompressor compensates for the loss of energy in the heat exchangers, the heatradiating from the vessel during operation, and loss of energy through the airejector. The performance of the centrifugal compressor is vital to the process. Itsupplies the energy required to drive the process inside the ORCA .The vapour compressor is a single-stage centrifugal vapour compressor whichrise the pressure of the produced vapour and thereby increases the temperatureof the vapour with approx. 3-5C, this temperature increase keep the processrunning.

11. Vent condenserThe vent condenser is a small plate heat exchanger (PHE). The hot vapour fromthe evaporation phase is cooled by incoming feed water, yielding its heat to thefeed for pre-heating. The vent condenser cools the vented vapour before itreaches the ejector. The ejector may function less efficiently, if the entering feedwater temperature is too high.

12. SeparatorThe demister is a small-meshed filter in stainless steel. The demister filters offdroplets in the produced vapour before the vapour enters the compressor.

13. Anti scalant dosing unitThe anti scalant dosing unit consist of a dosing pump mounted on a tank withmanual agitator and low level switch. The anti scalant is dosed to the feed water.


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All the above equipment is mounted and internally wired on the ORCA.

6.5 Optional Equipment

14. Seawater pumpThe seawater pump is a single-stage centrifugal pump. This pump supplies theORCA with seawater for the air ejector as well as feed water for evaporation.

15. Distillate Booster PumpA distillate booster pump with a backpressure valve can be added as loosesupply to the ORCA. A motor circuit breaker for the distillate booster pump isinstalled in the control panel. The distillate booster pump starts simultaneouslywith the distillate pump.This option can be needed if the distillate discharge pressure is more than 0.6

bar g.

16. De-chlorination dosing unitIf the feed water (seawater) contains more than 0,5% ppm of Chlorine *, it isrecommended to inject de-chlorination agent into the feed water, in order tominimize corrosion.

17. Mineralisation FilterWater produced from any freshwater generator, reaches a pH-value of 5 to 7.0.To bring the pH-value back to neutral ( 7 8.5 ) a pH-adjustment filter is to beinstalled after the freshwater generator. Drinking water should have a minimum ofcarbonate hardness for human healthcare and beside this, the carbonatehardness is helping to form protective layers against corrosion on all wettedsurfaces for instance within the pipe manifolds.

* Free chlorine ions.


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7 Electrical Specification

7.1 Environment conditionsAs a standard the plant is designed to operate in the following conditions:

AmbientTemperature

2 C to 50 C

SeawaterTemperature

18 C to 32 C

Humidity < 90 % Non-Condensing

Location Indoor & Non-Hazardous

7.2 Local Control Panel (LCP)The LCP is designed as a combined control and MCC (Motor Control Center)

panel in a common cabinet.

The LCP is installed directly on the ORCA frame.

7.3 CabinetThe cabinet material is (CS) sheet steel with the below specified thickness:Enclosure 1.5 mmDoor 2.0 mmMounting Plate 3.0 mmThe cabinet has the following surface finish:

Enclosure & Door Dip coat primer and powder coatedMounting plate Zinc plated

The standard cabinet color is light grey, RAL 7035.

The cabinet is protection class IP54.

7.4 Power SupplyA single power supply is needed for the LCP. The following power supplies arestandard:

Voltage Frequency3x380V 50Hz

3x400V

3x415V

3x690V

3x440V 60Hz

3x460V

3x480V

The following permanent variation in voltage and frequency can be accepted:


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PermanentVariation

Voltage 10%

Frequency 2 %

Typically a 200 A circuit breaker (or fuse) shall be installed on the main powersupply for the ORCA.

7.5 Installed PowerThe typical rated power installed on the ORCA is specified in below table:

Plant size 50Hz 60Hz

ORCA 20ORCA 30

ORAC 40ORCA 50

71 kW 78 kW

ORCA 60ORCA 70

80 kW 87 kW

The standard LCP is designed for a short circuit level of 30 kA.

7.6 Earting SystemThe earthing system is IT. The earth bar is divided in 2 earth bars in the LCP.Instrument Earth Bar IEProtection Earth Bar PE

Instrument Earth BarThe instrument cable screen is connected to the instrument earth bar in LCP.The instrument screen is standard not connected to the earth terminal on theinstrument.

The instrument earth bar is insulated from the LCP cabinet.

Protection Earth BarThe earth conductor in all power cables (yellow/green insulation) are connected

to the protection earth bar in LCP and the equipment (motors and heater).

The protection earth bar is connected to the LCP cabinet.

Earth bonding is installed between ORCA freshwater maker skid and:Vessel FramesLCPMotors

16mm2yellow/green insulated earth conductor is standard installed on allbonding, bonding on small motors (< 5kW) is, however, 6mm2.

7.7 PLCThe operation of the freshwater maker is controlled by a Programmable LogicController (PLC) with automatic start-up / stop and automatic production.


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7.8 HMIA touch screen operator panel (HMI) is installed on the front of LCP. Thefreshwater maker can be operated from the HMI only, however the plant can alsobe started and stopped from remote (hardwired signals).

985 22647-r02 installation manual orca offshore part1

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