rules and regulations classification of a floating...

Part 6Control and ElectricalEngineeringJune 2013

Rules and Regulationsfor theClassification of aFloating Offshore Installation at a Fixed Location

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Chapter ContentsRULES AND REGULATIONS FOR THE CLASSIFICATION OF A FLOATING OFFSHORE INSTALLATION AT A FIXED LOCATION, June 2013

Part 6

PART 1 REGULATIONS

PART 2 RULES FOR THE MANUFACTURE, TESTING AND CERTIFICATION OF MATERIALS

PART 3 FUNCTIONAL UNIT TYPES AND SPECIAL FEATURES

PART 4 STEEL UNIT STRUCTURES

PART 5 MAIN AND AUXILIARY MACHINERY

PART 6 CONTROL AND ELECTRICAL ENGINEERING

Chapter 1 Control Engineering Systems

2 Electrical Engineering

PART 7 SAFETY SYSTEMS, HAZARDOUS AREAS AND FIRE

PART 8 CORROSION CONTROL

PART 9 CONCRETE UNIT STRUCTURES

PART 10 SHIP UNITS

PART 11 PRODUCTION, STORAGE AND OFFLOADING OF LIQUEFIED GASES IN BULK

LLOYD’S REGISTER 1

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ContentsRULES AND REGULATIONS FOR THE CLASSIFICATION OF A FLOATING OFFSHORE INSTALLATION AT A FIXED LOCATION, June 2013

Part 6

2 LLOYD’S REGISTER

CHAPTER 1 CONTROL ENGINEERING SYSTEMS

Section 1 General requirements1.1 General1.2 Documentation1.3 Control, alarm and safety equipment1.4 Alterations and additions

Section 2 Essential features for control, alarm and safety systems2.1 General2.2 Control stations for machinery and equipment2.3 Alarm systems2.4 Safety systems2.5 Control systems – General requirements2.6 Manoeuvring controls for propulsion machinery2.7 Valve control systems2.8 Ballast control systems for column-stabilised units2.9 Programmable electronic systems – General requirements

2.10 Data communication links2.11 Additional requirements for wireless data communication links2.12 Programmable electronic systems – Additional requirements for essential services and safety

critical systems2.13 Programmable electronic systems – Additional requirements for integrated systems

Section 3 Control and supervision of unattended machinery3.1 General3.2 Oil engines for propulsion purposes3.3 Steam turbine machinery3.4 Gas turbine machinery3.5 Main, auxiliary and other boilers3.6 Thermal fluid heaters3.7 Inert gas generators3.8 Incinerators3.9 Auxiliary and other engines

3.10 Controllable pitch propeller and transverse thrust units3.11 Podded propulsion units3.12 Cargo and ballast pumps in hazardous spaces3.13 Electric system3.14 Steering gear3.15 Miscellaneous services and machinery

Section 4 Unattended machinery space(s) – UMS notation4.1 General4.2 Alarm system for machinery4.3 Remote control of propulsion machinery4.4 Control stations for machinery4.5 Fire detection alarm system4.6 Bilge level detection4.7 Supply of electric power – General

Section 5 Machinery operated from a centralised control station – CCS notation5.1 General requirements5.2 Centralised control system for machinery

Section 6 Integrated computer control – ICC notation6.1 General6.2 General requirements6.3 Operator stations


Part 6


Section 7 Functional testing7.1 General7.2 Unattended machinery space operation – UMS notation7.3 Operation from a centralised control station – CCS notation7.4 Record of trials

Section 8 Ergonomics of control stations8.1 Control station layout8.2 Physical environment8.3 Operator interface, controls, display

CHAPTER 2 ELECTRICAL ENGINEERING

Section 1 General requirements1.1 General1.2 Plans1.3 Equipment surveys during construction1.4 Additions or alterations1.5 Definitions1.6 Design and construction of equipment1.7 Quality of power supplies1.8 Ambient reference conditions1.9 Inclination of the unit

1.10 Location and construction1.11 Earthing of non-current-carrying parts1.12 Bonding for the control of static electricity1.13 Alarms1.14 Operation under fire conditions1.15 Protection of electrical equipment against the effects of lightning strikes

Section 2 Main source of electrical power2.1 General2.2 Number and rating of generating sets2.3 Number and rating of converting equipment2.4 Starting arrangements2.5 Prime mover governors2.6 Main propulsion driven generators not forming part of the main source of electrical power

Section 3 Emergency source of electrical power3.1 General3.2 Starting arrangements3.3 Prime mover governor3.4 Radio installation3.5 Accommodation units

Section 4 External source of electrical power4.1 Temporary external supply4.2 Permanent external supply

Section 5 Supply and distribution5.1 Systems of supply and distribution5.2 Essential services5.3 Isolation and switching5.4 Insulated distribution systems (IT systems)5.5 Earthed distribution systems (TN systems)5.6 Diversity factor5.7 Lighting circuits5.8 Motor circuits5.9 Motor control


Part 6


Section 6 System design – Protection6.1 General6.2 Protection against short-circuit6.3 Protection against overload6.4 Protection against earth faults6.5 Circuit-breakers6.6 Fuses6.7 Circuit-breakers requiring back-up by fuse or other device6.8 Protection of generators6.9 Load management

6.10 Feeder circuits6.11 Motor circuits6.12 Protection of transformers

Section 7 Switchgear and control gear assemblies7.1 Construction and testing7.2 Position of switchboards

Section 8 Rotating machines8.1 Construction, performance, control and testing8.2 Temperature rise

Section 9 Converter equipment9.1 Transformers9.2 Semi-conductor equipment9.3 Uninterruptible power systems (UPS)

Section 10 Electrical cables and busbar trunking systems (busways)10.1 Construction, selection and testing10.2 Installation of electric cables10.3 Mechanical protection of cables

Section 11 Batteries11.1 Secondary batteries of the vented and valve regulated sealed type11.2 Sealed batteries

Section 12 Equipment – Heating, lighting and accessories, electric trace heating, underwatersystems and refrigeration

12.1 Heating and cooking equipment, lighting, socket outlets and plugs, and enclosures12.2 Underwater systems/impressed current cathodic protection12.3 Refrigeration

Section 13 Navigation and manoeuvring systems13.1 Steering gear13.2 Thruster systems for dynamic positioning13.3 Thruster systems for manoeuvring13.4 Thruster systems for steering13.5 Thruster systems for thruster-assisted mooring systems13.6 Navigation lights13.7 Helideck and Aircraft Warning Lights

Section 14 Signalling lights and sound signals14.1 General

Section 15 Electric propulsion15.1 General15.2 Power requirements15.3 Propulsion control15.4 Protection of propulsion system15.5 Instruments


Part 6

Section 16 Testing and trials16.1 Testing16.2 Trials16.3 High voltage cables16.4 Hazardous areas

Section 17 Spare gear17.1 General


RULES AND REGULATIONS FOR THE CLASSIFICATION OF A FLOATING OFFSHORE INSTALLATION AT A FIXED LOCATION, June 2013

Control Engineering Systems Part 6, Chapter 1Section 1


Section

1 General requirements

2 Essential features for control, alarm and safetysystems

3 Control and supervision of unattendedmachinery

4 Unattended machinery space(s) – UMS notation

5 Machinery operated from a centralised controlstation – CCS notation

6 Integrated computer control – ICC notation

7 Functional testing

8 Ergonomics of control stations

Section 1General requirements

1.1 General

1.1.1 The requirements of this Chapter apply to all unitsdefined in Pt 1, Ch 2. Where applicable, the relevantrequirements for control, alarm and safety systems as statedin Pt 6, Ch 1 of the Rules and Regulations for theClassification of Ships (hereinafter referred to as the Rules forShips) are to be complied with.

1.1.2 Attention is to be given to the relevant statutoryrequirements of the National Administrations of the country inwhich the unit is to be registered and in the area of operation,as applicable.

1.1.3 These requirements apply to manned offshoreunits. Special consideration will be given to unmannedoffshore units which are controlled from the shore or fromanother offshore installation.

1.1.4 Where reference is made in this Chapter to therequirements of the Rules for Ships, references therein to‘ship(s)’ are to be understood to apply to ‘unit(s)’.

1.2 Documentation

1.2.1 The documentation described in 1.2.2 to 1.2.8 isto be submitted for design review.

1.2.2 Where control, alarm and safety systems areintended for machinery or equipment as defined in 1.2.3, theplans and particulars stated in Pt 6, Ch 1,1.2.2 of the Rulesfor Ships are to be submitted.

1.2.3 Documentation for the control, alarm and safetysystems of the following is to be submitted, as applicable:(a) Propulsion and positioning systems:

• Controllable pitch propellers.• Dynamic positioning systems.• Positional mooring and single point mooring

systems.• Propelling machinery, including essential auxiliaries.• Steering gear.• Thruster-assisted positional mooring systems.• Thruster units.

(b) Utilities and services:• Air compressors.• Bilge and ballast systems.• Cargo and ballast pumps in hazardous areas.• Cargo tank, ballast tank and void space

instrumentation where specified by other Sectionsof the Rules (e.g., water ingress detection, gasdetection).

• Diving systems, including compression chambers.• Electric generating plant.• Evaporating and distilling systems.• Fixed water based local application fire-fighting

systems.• General service plant air and control and instrument

air systems.• Heating Ventilation and Air Conditioning (HVAC)

systems, including arrangements provided inrespect of 1.3.4.

• Incinerators.• Inert gas generators.• Lifting appliances.• Main propelling machinery including essential

auxiliaries.• Mechanical refrigeration systems.• Miscellaneous machinery or equipment (where

control, alarm and safety systems are specified byother Sections of the Rules).

• Oil fuel transfer and storage (purifiers and oilheaters).

• Oily water separators.• Steam raising plant (boilers and their ancillary

equipment).• Steering gear.• Tempered water systems.• Thermal fluid heaters.• Waste heat boiler.• Valve position indicating systems, see 2.7.

(c) Process plant equipment:• Coalescers, skimmers and dehydrators.• Export pumps and compressors.• Gas compressors.• Gas lift systems.• Glycol contactors and regenerators.• Heat exchangers.• HP and LP flare systems.• Process analysers.• Production and test separator vessels.• Production transfer and storage systems.• Sand detection systems.• Scrubbers.• Sphere launching and receiving systems.• Surge, flash and knock out drums.• Water, gas and chemical injection systems.• Well-head, choke and header systems.

1.4 Alterations and additions

1.4.1 The requirements for alterations and additions aregiven in Pt 6, Ch 1,1.4 of the Rules for Ships, which are to becomplied with.

Section 2Essential features for control,alarm and safety systems

2.1 General

2.1.1 Where it is proposed to install control, alarm andsafety systems to the equipment defined in 1.2.3, theapplicable features contained in Pt 6, Ch 1,2 of the Rules forShips are to be incorporated in the system design.

2.2 Control stations for machinery and equipment

2.2.1 The requirements for control stations for machineryand equipment are given in Pt 6, Ch 1,2.2 of the Rules forShips, which are to be complied with where applicable.

2.2.2 Additions or amendments to these requirementsare given in 2.2.3 to 2.2.4.

2.2.3 Means of communication are to be provided asapplicable between the main control station, subsidiary stations,the bridge area where applicable, the unit manager’s office, thedrill floor, the tool pusher’s office and the accommodation foroperating personnel.

2.2.4 For requirements regarding general emergencyalarm systems, see also Pt 7, Ch 1,3.3.

2.3 Alarm systems

2.3.1 The general requirements for alarm systems aregiven in Pt 6, Ch 1,2.3 of the Rules for Ships, which are to becomplied with where applicable.

2.3.2 The acknowledgement of alarms at main andsubsidiary control stations is to be arranged so that theoperator required to take action is aware of the fault.Generally, it should not be possible to acknowledge alarmsfrom positions other than the relevant control station or thespace in which the machinery is situated.

2.4 Safety systems

2.4.1 Where safety systems are provided, therequirements of Pt 6, Ch 1,2.4 of the Rules for Ships are tobe satisfied. The requirements of this sub-Section apply,where relevant, to the safety systems installed on theequipment defined in 1.2.3, including those provided inaddition to those safeguards required by Section 3 or Part 5.


Control Engineering Systems Part 6, Chapter 1Sections 1 & 2


• Wireline systems.(d) Drilling plant equipment:

• Blow out preventer stacks and diverter systems.• Cement and barytes storage and handling systems.• Choke and kill systems.• Drawworks and eddy current brakes.• Mud logging systems.• Mud and cement pumps.• Mud treatment systems.• Rotary table.• Wireline systems.

(e) Riser systems.

1.2.4 Alarm systems. Details of the overall alarmsystem, linking the main control station, subsidiary controlstations, conning positions and, where applicable, the bridgearea, the accommodation and other areas where dutypersonnel may be present, are to be submitted.

1.2.5 Programmable electronic systems. In additionto the documentation required by 1.2.2 and by Pt 6, Ch1,1.2.5 of the Rules for Ships, details of self-monitoringtechniques are to be submitted.

1.2.6 Wireless data communication. For wireless datacommunication equipment the documentation required by Pt 6, Ch 1,1.2.6 of the Rules for Ships is to be submitted.

1.2.7 Control stations. Plans and particulars required tobe submitted are given in Pt 6, Ch 1,1.2.7 of the Rules forShips.

1.2.8 Approved system. Where it is intended to employa standard system which has been previously approved,plans are not required to be submitted, providing there havebeen no changes in the applicable Rule requirements. Thebuilding port, where applicable, the specific project and dateof the previous approval are to be advised.

1.3 Control, alarm and safety equipment

1.3.1 The requirements for control, alarm and safetyequipment are given in Pt 6, Ch 1,1.3 of the Rules for Ships,which are to be complied with.


1.3.3 For fire and gas detection alarm systems, see Pt 7, Ch 1,2.2.9 and for programmable electronic systems, seePt 6, Ch 1,2.10.5 and Pt 6, Ch 1,2.13.3 of the Rules forShips.

1.3.4 Where equipment requires a controlledenvironment, alternative arrangements, whether permanentlyinstalled or of a temporary nature, are to be provided tomaintain the required environment in the event of a failure ofthe normal air conditioning system, see also 3.15.14. Detailsof these arrangements are to be submitted for consideration.


2.4.3 For emergency shut-down systems, see also Pt 7,Ch 1,7.

2.4.4 For safety system alarms, see also 3.1.4.

2.5 Control systems – General requirements

2.5.1 The requirements for control systems of machineryand process equipment are given in Pt 6, Ch 1,2.5 of theRules for Ships, which are to be complied with.

2.6 Manoeuvring controls for propulsionmachinery

2.6.1 Where manoeuvring control systems for propulsionmachinery are to be fitted, the requirements of Pt 6, Ch 1,2.6of the Rules for Ships are to be complied with whereapplicable.NOTES

1. The conning position will be located on the bridge ofthe unit, where such is provided. Where there is no designated bridge area, the requirements for theconning position remain applicable, wherever its location.

2. Where the Rules for Ships refer to ‘bridge controlsystem’, this should be understood to apply topropulsion control system.


2.6.3 Instrumentation to indicate the following is to befitted at the conning position:(a) Direction and speed of rotation of propeller for a fixed

pitch propeller or pitch position for controllable pitchpropeller, see also 3.10.

(b) Clutch position, where applicable.(c) Shaft brake position, where applicable.(d) For an azimuth thruster, direction and magnitude of

thrust, and alarms and indications as detailed inTable 20.4.1 in Pt 5, Ch 20 of the Rules for Ships.

2.6.4 Azimuth thrust direction is to be controlled from theconning position under all sea-going and manoeuvringconditions.

2.6.5 Two means of communication are to be providedbetween the conning position and the main control station inthe machinery space. One of these means may be thepropulsion control system; the other is to be independent ofthe main electrical power supply, see also 2.2.3 and thefollowing:• One of these means is to indicate visually the order and

response, both at the main control station in themachinery space and the conning position.

• At least one means of communication is to be providedbetween the conning position and any other controlposition(s) from which the propulsion machinery maybe controlled.



2.7 Valve control systems

2.7.1 The requirements for valve control systems aregiven in Pt 6, Ch 1,2.7 of the Rules for Ships, which are to becomplied with where applicable.

2.7.2 Additions or amendments to these requirementsare given in 2.7.3 and 2.7.4.

2.7.3 For ballast controls of column-stabilised units, seealso 2.8.

2.7.4 For requirements applicable to closing applianceson scuppers and sanitary discharges, see Pt 4, Ch 8,10.

2.8 Ballast control systems for column-stabilisedunits

2.8.1 Column-stabilised units are to be provided with aballast control system which meets the requirements of 2.8.2to 2.8.8. The requirements for intact and damage stability andrelated definitions used in this Section are given in Pt 4, Ch 8,to which reference should be made.

2.8.2 A centralised ballast control station is to beprovided from which all ballast operations can be performed.It is to be situated above zones of immersion after damage, ashigh as possible, as near a central position on the unit as ispracticable, and adequately protected from the weather.

2.8.3 Control and instrumentation for the following is tobe provided at the centralised control station:(a) Ballast pump stop/start arrangements, status

indicators, and control facilities.(b) Ballast valve controls and position indication.(c) Ballast tank level indication.(d) Tank level indication of all tanks containing quantities

of liquid that could affect stability of the unit, includingfuel oil, fresh water, drilling water and other storedliquids.

(e) Unit draught, heel and trim indication.(f) Remote controls and indicators for watertight doors

and hatch covers and other closing appliances, seePt 7, Ch 1,9.

(g) Bilge and flood alarms, see Pt 7, Ch 1,9.(h) Mooring line tension indication.

2.8.4 A permanently installed means of communication,independent of the unit’s main source of electrical power, isto be provided between the centralised ballast control stationand spaces that contain ballast pumps and servicesnecessary for ballast operations, including local hand controlscalled for in 2.8.5.

2.8.5 In addition to the centralised controls required by2.8.3(a) and (b), permanently installed local controls are to beprovided to allow operation in the event of failure of thecentralised controls.

2.8.6 The independent local controls for each ballastpump and its associated ballast tank valves are to be locatedin the same location, and a diagram of that part of the systemis to be permanently displayed at the local control position.




2.8.7 The local controls are to be in readily accessiblepositions, and the associated access routes are to be situatedinboard of the penetration zones after defined damage, seePt 4, Ch 8,3.2. They are also to remain accessible andprotected from the weather when the unit is in the intact anddamaged condition.

2.8.8 Valve controls are to comply with 2.7 and, inaddition, remote valve position indication systems are tofunction as independently as practicable of the controlsystems, see also Pt 5, Ch 12,11, and particularly Pt 5,Ch 13,11.5.

2.9 Programmable electronic systems – Generalrequirements

2.9.1 The requirements for programmable electronicsystems are given in Pt 6, Ch 1,2.10 of the Rules for Ships,which are to be complied with.

2.10 Data communication links

2.10.1 The requirements for data communication linksare given in Pt 6, Ch 1,2.11 of the Rules for Ships, which areto be complied with.

2.11 Additional requirements for wireless datacommunication links

2.11.1 The requirements for wireless data communicationlinks are given in Pt 6, Ch 1,2.12 of the Rules for Ships,which are to be complied with. The requirements are inaddition to 2.10 and apply to systems incorporating wirelessdata communication links.

2.12 Programmable electronic systems –Additional requirements for essential servicesand safety critical systems

2.12.1 The requirements for programmable electronicsystems incorporated in control, alarm or safety systems foressential services, as defined by Pt 6, Ch 2,1.6, or safetycritical systems, are given in Pt 6, Ch 1,2.13 of the Rules forShips, which are to be complied with.

2.12.2 Additions or amendments to these requirementsare given in 2.12.3.

2.12.3 Input and output connections for safety criticalsystems (including emergency shut-down push buttonsignals) are to be hard wired unless shown to meet therelevant requirements of Pt 7, Ch 1,7 for emergency shut-down systems. The transmission of the alarm and statusinformation by digital means between the system and thesupervisory workstation is permissible.

2.13 Programmable electronic systems –Additional requirements for integratedsystems

2.13.1 The requirements for programmable electronicsystems for integrated systems are given in Pt 6, Ch 1,2.14of the Rules for Ships, which are to be complied with.

Section 3Control and supervision ofunattended machinery

3.1 General

3.1.1 When machinery and equipment as listed in 1.2.3 isfitted with automatic or remote controls so that under normaloperating conditions it does not require any manualintervention by the operators, it is to be provided with thealarms and safety arrangements required by 3.2 to 3.15 asappropriate. Alternative arrangements which provideequivalent safeguards will be considered.

3.1.2 Where machinery is arranged to start automaticallyor from a remote control position, interlocks are to beprovided to prevent start-up under conditions which couldhazard the machinery.

3.1.3 Where machinery specified in Part 5 is required tobe provided with a standby pump, the standby pump is tostart automatically if the discharge pressure from the workingpumps falls below a predetermined value.

3.1.4 Where a first stage alarm together with a secondstage alarm and automatic shut-down of machinery arerequired in the relevant Tables of Part 5, the sensors andcircuits utilised for the second stage alarm and automaticshut-down are to be independent of those required for thefirst stage alarm.

3.1.5 Where means are provided to prevent leaks fromhigh pressure oil fuel injection piping for main and auxiliaryengines dripping or spraying onto hot surfaces or intomachinery air inlets, an alarm is to be provided to indicate thatleakage is taking place, see Pt 5, Ch 2,7.1.2 and 15.4.3.These requirements may also be applicable to high pressurehydraulic oil piping, see Pt 5, Ch 2,7.2.1 and 14.4.4.

3.1.6 Oil mist monitoring or engine bearing temperaturemonitors for crankcase protection are to be provided:(a) when arrangements are fitted to override the automatic

stop for excessive reduction of the lubricating oil supplypressure; and

(b) for engines of 2250 kW and above or having cylindersof more than 300 mm bore.

NOTE:1. For medium and high speed engines, automatic shut-down of the engine is to occur, see also 3.2.1.2. For slow speed engines, automatic slow-down is to occur.


3. Where arrangements are made to override the automaticslow-down or shut-down due to high oil mist or bearingtemperature, the override is to be independent of otheroverrides.4. Where the bearing temperature monitoring method ischosen, all bearings in the crankcase are to be monitoredwhere practicable, e.g., main, crankpin, crosshead.5. Where engine bearing temperature monitors or alternativemethods are provided for the prevention of the build-up of oilmist that may lead to a potentially explosive condition withinthe crankcase, details are to be submitted for consideration.The submission is to demonstrate that the arrangements areequivalent to those provided by oil mist monitoring or enginebearing temperature monitors. See also Pt 5, Ch 2,10.8.14and 10.8.15 of the Rules for Ships.

3.2 Oil engines for propulsion purposes

3.2.1 Alarms and safeguards are indicated in Pt 5, Ch 2,7.2 of the Rules for Ships, which are to be compliedwith.

3.3 Steam turbine machinery

3.3.1 Alarms and safeguards are indicated in Pt 5, Ch 3.6 of the Rules for Ships, which are to be complied with.


3.3.3 For steam turbines the requirements of Pt 5, Ch 3,4for safety arrangements and Pt 5, Ch 3,5 for emergencyarrangements are to be followed.

3.4 Gas turbine machinery

3.4.1 Alarms and safeguards are indicated in Pt 5, Ch 4,8of the Rules for Ships, which are to be complied with.


3.4.3 For gas turbines the requirements of Pt 5, Ch 4,8for control, alarm and safety systems are to be followed.

3.5 Main, auxiliary and other boilers

3.5.1 Alarms and safeguards are indicated in Pt 5, Ch 10,18 of the Rules for Ships, which are to be compliedwith.

3.6 Thermal fluid heaters

3.6.1 Alarms and safeguards are indicated in Pt 5, Ch 10,18 of the Rules for Ships, which are to be compliedwith.




3.6.3 The requirements in Pt 5, Ch 15,6 and associatedTable 15.6.1 are to be followed.

3.7 Inert gas generators

3.7.1 Alarms and safeguards are indicated in Pt 5, Ch 14,12.3 of the Rules for Ships, which are to be compliedwith.


3.7.3 Instrumentation and alarms are indicated in Pt 5,Ch 15,7.7.

3.7.4 For flue gas inert gas system requirements, see Pt 5, Ch 15,7 of the Rules for Ships.

3.8 Incinerators

3.8.1 Alarms and safeguards are indicated in Pt 5, Ch 14,13.2 and associated Table 14.13.2.

3.9 Auxiliary and other engines

3.9.1 Alarms and safeguards are indicated in Pt 5, Ch 2,7 of the Rules for Ships, which are to be complied with.

3.10 Controllable pitch propeller and transversethrust units

3.10.1 Alarms and safeguards are indicated in Pt 5, Ch 7,5 of the Rules for Ships, which are to be complied withwhere applicable.

3.11 Podded propulsion units

3.11.1 Alarms and safeguards are indicated in Pt 5, Ch9,8.2 and associated Table 9.8.1.

3.12 Cargo and ballast pumps in hazardous spaces

3.12.1 Alarms and safeguards are indicated in Pt 7, Ch 2,5.1.8 and associated Table 2.5.1.

3.13 Electric system

3.13.1 Alarms and safeguards are indicated in Pt 6,Ch 2,1.14.

3.14 Steering gear

3.14.1 For the requirements for steering gear, see Pt 5,Ch 19,5.3.




3.15 Miscellaneous services and machinery

3.15.1 Alarms and safeguards are indicated in Pt 5,Ch 14,12.5 of the Rules for Ships, which are to be compliedwith where applicable.


3.15.3 Dual fuel systems. Indication for dual fuelsystems is given in Pt 5, Ch 14,12.5.2 of the Rules for Ships,which are to be complied with. For oil and gas dual firedsystems for boilers and engines, see Pt 5, Ch 16,1.

3.15.4 Lifts. For details of alarms and safeguards for liftsclassed by LR, reference should be made to LR’s Code forLifting Appliances in a Marine Environment.

3.15.5 Oil heaters. Alarms and safeguards are given inPt 5, Ch 14,12.5.4 of the Rules for Ships, which are to becomplied with. For oil fuel or lubricating oil heaters, see Pt 5,Ch 14,3.13.17.

3.15.6 Oil tank electric heating. Alarms andsafeguards are given in Pt 5, Ch 14,12.5.5 of the Rules forShips, which are to be complied with. For oil fuel andlubricating oil tanks that are provided with electric heatingelements, see Pt 5, Ch 14,3.13.21.

3.15.7 Oil fuel tanks. Means are to be provided toeliminate the possibility of overflow from daily service oil fueltanks into the machinery space and to safeguard againstoverflow of oil from the daily service oil fuel tanks through theair pipe together with termination of air pipes, see also Pt 5, Ch 13,12.5.

3.15.8 Sterntube. Alarms are given in Pt 5, Ch 14,12.5.1of the Rules for Ships, which are to be complied with whereapplicable. For lubricating oil tank and bearing temperature,see also Pt 5, Ch 6,3.12.7 and 3.12.8.

3.15.9 Coolant tanks, feedwater tanks, and dailyservice tanks, settling tanks, and sludge tanks, see Pt5, Ch 14,2.1.4, 2.9.10, 3.13.4, 13.1 and associated Table14.13.1.

3.15.10 Oil fuel, see Pt 5, Ch 14,2.

3.15.11 Oil fuel and lubricating oil purifiers, see Pt 5,Ch 14, Sections 2, 4, 8 and 13.

3.15.12 Air compressors, see Pt 5, Ch 14, Sections 10and 13.

3.15.13 Hydraulic power units and control air systems, seePt 5, Ch 14, Sections 8, 9, 10, 13 and associated Table14.13.1.

3.15.14 An alarm is to operate for abnormal controlledenvironmental conditions when equipment requires airconditioning, see Pt 5, Ch 14,13 and associated Table14.13.1 and 1.3.

Section 4Unattended machinery space(s) – UMS notation

4.1 General

4.1.1 The general requirements for unattendedmachinery space(s) are given in Pt 6, Ch 1,4.1 of the Rulesfor Ships, which are to be complied with.


4.1.3 The requirements of this Section apply to all typesof thrusters incorporated in the propulsion or positioningsystems of the unit.

4.1.4 For this Section where the Rules for Ships refer to‘bridge’, this should be understood to apply to the conningposition, the bridge, if fitted or otherwise a continuouslyattended control station, as approproate for the operatingcondition of the unit.

4.1.5 For this Section where the Rules for Ships refer to‘engineering personnel’, this should be understood to apply tomaintenance personnel.

4.2 Alarm system for machinery

4.2.1 Details are to be submitted.


4.2.3 An alarm system which will provide warning offaults in the machinery is to be installed. The system is tosatisfy the requirements of 2.3.

4.3 Remote control of propulsion machinery

4.3.1 Where propulsion machinery is installed, it is to beprovided with a remote control system operable at theconning position. The system is to satisfy the requirements of2.6.

4.4 Control stations for machinery

4.4.1 Control stations are to be provided in the vicinity ofthe propulsion machinery and at the conning position orbridge, if fitted, and are to satisfy the requirements of 2.2.

4.5 Fire detection alarm system

4.5.1 An automatic fire detection system is to be fitted toprotect all unattended spaces together with an audible andvisual alarm system. The system is to satisfy the requirementsof Pt 7, Ch 1,2.


4.6 Bilge level detection

4.6.1 The requirements for bilge level detection are givenin Pt 6, Ch 1,4.6 of the Rules for Ships, which are to becomplied with.


4.6.3 A minimum of two independent systems of bilgelevel detection is to be provided in each machinery space thatis situated below the water line. In addition, each branch bilgeas required by Pt 5, Ch 13,4 is to be provided with a leveldetector.

4.7 Supply of electric power – General

4.7.1 For units which operate with one generator set inservice, arrangements are to be such that a standbygenerator will automatically start and connect to theswitchboard on loss of the service generator. For units whichoperate with two or more generator sets in service,arrangements are to be such that on loss of one generatorthe remaining one(s) are to be adequate for continuity ofessential services. For the detailed requirements of thesearrangements, see Ch 2,2.2.

Section 5Machinery operated from acentralised control station –CCS notation

5.1 General requirements

5.1.1 The requirements for machinery operated from acentralised control station are given in Pt 6, Ch 1,5.1 of theRules for Ships, which are to be complied with.


5.1.3 The controls, alarms and safeguards required bySection 3 and by 4.6 together with a fire detection systemsatisfying the requirements of Pt 7, Ch 1,2 are to be provided.However, the automatic operation of machinery and certainsafeguards required by Section 3 may be omitted. Wheresuch safeguards are omitted, due consideration is to be givento the reaction time required for manual intervention, followingindication that a system or equipment has deviated outsideacceptable operational limits.

5.2 Centralised control system for machinery

5.2.1 The requirements for centralised control system formachinery are given in Pt 6, Ch 1,5.2 of the Rules for Ships,which are to be complied with where applicable.



Control Engineering Systems Part 6, Chapter 1Sections 4, 5 & 6

5.2.3 Pt 6, Ch 1,5.2.6 of the Rules for Ships is notapplicable to offshore installations.

Section 6Integrated computer control – ICC notation

6.1 General

6.1.1 Integrated Computer Control class notation ICCmay be assigned where an integrated computer system incompliance with Pt 6, Ch 1,6 of the Rules for Ships providesfault tolerant control and monitoring functions for one or moreof the following services:• Propulsion and auxiliary machinery.• Dynamic positioning systems.• Positional mooring systems.• Ballast systems.• Process and utilities.• Drilling equipment.• Product storage and transfer systems.

6.2 General requirements

6.2.1 The integrated computer control system is tocomply with the programmable electronic systemrequirements of 2.9 to 2.13 and Pt 6, Ch 1,6.2 of the Rules forShips and the control and monitoring requirements of theRules applicable to particular equipment, machinery orsystems.


6.2.3 Alarm and indication functions required by 2.4 areto be provided by the integrated computer control system inresponse to the activation of any safety function forassociated machinery. Systems providing the safety functionsshould be independent of the integrated computer system,see also Pt 6, Ch 1,2.12.8 of the Rules for Ships.

6.2.4 Controls are to be provided, in compliance with2.5, to ensure the safe and effective operation of equipmentand response to faults, e.g., stopping, starting, adjustment orparameters, etc. Indication of operational status and othersuch parameters necessary to satisfy this requirement is tobe provided for all equipment under control by the integratedcomputer control system.

6.3 Operator stations

6.3.1 The requirements for the operator stations aregiven in Pt 6, Ch 1,6.3 of the Rules for Ships, which are to becomplied with.




Control Engineering Systems Part 6, Chapter 1Sections 6, 7 & 8

6.3.3 Where the integrated computer control system isarranged such that control and monitoring functions may beaccessed at more than one operator station, the selectedmode of operation of each station (e.g., in control, standby,etc.) is to be clearly indicated, see also 2.2.

Section 7Functional testing

7.1 General

7.1.1 The general requirements for the functional testsare given in Pt 6, Ch 1,7.1 of the Rules for Ships, which are tobe complied with.

7.2 Unattended machinery space operation –UMS notation

7.2.1 In addition to the tests required by 7.1, therequirements for the functional tests of ‘UMS’ notation duringfinal commissioning sea trials are given in Pt 6, Ch 1,7.2 ofthe Rules for Ships, which are to be complied with.

7.3 Operation from a centralised control station – CCS notation

7.3.1 In addition to the tests required by 7.1, therequirements for the functional tests of ‘CCS’ notation duringfinal commissioning sea trials are given in Pt 6, Ch 1,7.3 ofthe Rules for Ships, which are to be complied with.

7.4 Record of trials

7.4.1 The requirements for the records of the trials aregiven in Pt 6, Ch 1,7.4 of the Rules for Ships, which are to becomplied with.

Section 8Ergonomics of control stations

8.1 Control station layout

8.1.1 In order to take account of operator tasks at controlstations, enhance usability and reduce human error, the layoutarrangements are to comply with the requirements set out inPt 6, Ch 1,3.2 of the Rules for Ships.

8.2 Physical environment

8.2.1 In order to establish a working environment thathas minimum distractions, is sufficiently comfortable, helpsmaintain vigilance and maximises communication amongstoperators at main control stations, the requirements in Pt 6,Ch 1,3.3 of the Rules for Ships are to be complied with.

8.3 Operator interface, controls, display

8.3.1 The requirements in Pt 6, Ch 1,3.4 to 3.6 of theRules for Ships apply to operator interfaces for essentialengineering systems located either locally, remotely or withinthe main control room. The requirements are intended toenhance the usability of systems and equipment, reducehuman error, enhance situational awareness and support safeand effective monitoring and control under normal andabnormal modes of operation.



Electrical Engineering Part 6, Chapter 2Section 1


Section

1 General requirements

2 Main source of electrical power

3 Emergency source of electrical power

4 External source of electrical power

5 Supply and distribution

6 System design – Protection

7 Switchgear and control gear assemblies

8 Protection from electric arc hazards withinelectrical equipment

9 Rotating machines

10 Converter equipment

11 Electrical cables and busbar trunking systems(busways)

12 Batteries

13 Equipment – Heating, lighting and accessories, electric trace heating, underwatersystems and refrigeration

14 Signalling lights and sound signals

15 Navigation and manoeuvring systems

16 Electric propulsion

17 Testing and trials

18 Spare gear

Section 1General requirements

1.1 General

1.1.1 The requirements of this Chapter apply to all unittypes defined in Pt 1, Ch 2 except where otherwise stated.Where applicable, the relevant requirements for electricalservices necessary to maintain the unit in a normal sea-going,operational and habitable condition, for electrical servicesessential for safety and for the safety of crew and ship fromelectrical hazards as stated in Pt 6, Ch 2 of the Rules andRegulations for the Classification of Ships (hereinafter referredto as the Rules for Ships) are to be complied with.

1.1.2 Attention is also to be given to any relevantStatutory Regulations of the National Authority in which theunit is to operate and/or be registered. Compliance with theStatutory Regulations of the National Authority may beaccepted as meeting the requirements of the InternationalConvention for the Safety of Life at Sea, 1974, and applicableamendments.

1.1.3 Where reference is made to the requirements of theRules for Ships, references therein to ‘ship(s)’ are to be under-stood to refer to ‘unit(s)’.

1.2 Documentation required for design review

1.2.1 The documentation described in Pt 6, Ch 2,1.2 ofthe Rules for Ships is to be submitted for design review.NOTE

Where reference is made in the Rules for Ships to explosivegas atmospheres and/or combustible dusts, or to theelectrical equipment for use in those areas, see also Pt 7, Ch 2,8 and Ch 2,9.


1.2.3 System study and calculations are to be in accor-dance are with the IEC 61892-2 Section 9, or an acceptableand relevant National Standard.

1.2.4 The general arrangement of the unit, showing thehazardous zones and spaces, is to include details on ignitiontemperature and hence temperature class and gas group.

1.3 Documentation required for supportingevidence

1.3.1 The documentation and particulars in Pt 6, Ch 2,1.3 ofthe Rules for Ships are to be submitted as supportingevidence.


1.3.3 A description of the philosophy of the systems ofpower generation and distribution, describing their modes ofoperation under normal and emergency conditions, is to besubmitted.

1.4 Surveys

1.4.1 The equipment required to be surveyed is given inPt 6, Ch 2,1.4 of the Rules for Ships, which are to becomplied with.

1.5 Additions or alterations

1.5.1 The requirements for additions or alterations aregiven in Pt 6, Ch 2,1.5 of the Rules for Ships, which are to becomplied with.


1.9.3 The rating for classification purposes of essentialelectrical equipment is to be based on the maximum ambientair and water temperatures expected at the location of theunit. In the absence of precise temperatures, the followingtemperatures are to be assumed:(a) For units intended to operate within the tropical belt (i.e.,

between latitudes 35°N and 20°S):Primary cooling water supply 32°CCooling air temperature 45°C

(b) For units intended to operate in northern or southernwaters outside the tropical belt:Primary cooling water supply 25°CCooling air temperature 40°C.

1.9.4 The air temperature range considered with respectto the selection of equipment the safe operation of which maybe subject to limitations on ambient temperature (e.g.,safe type electrical equipment) is to be that expected at thelocation of the equipment, taking into account local sources ofheat and the range of ambient air temperature expected atthe location of the unit. In the absence of precise informa-tion, the maximum air temperature is to be assumed to be thecooling air temperature given in 1.8.1(a) or (b), as appropri-ate, and the minimum is to be assumed to be minus 20°C, oras determined by reference to Annex B of IEC 61892-1:Mobile and fixed offshore units – Electrical installations – Part1: General requirements and conditions.

1.9.5 Where electrical equipment is installed within envi-ronmentally controlled spaces, the ambient temperature forwhich the equipment is suitable for operation at its ratedcapacity may be reduced to a value below that determinedby reference to 1.9.3 or 1.9.4, provided that the requirementsof Pt 6, Ch 2,1.9.4 of the Rules for Ships are complied withwhere applicable, see also Ch 1,1.3.4.

1.10 Inclination of the unit

1.10.1 The requirements for inclination of the unit are givenin Pt 5, Ch 1,3.7, which are to be complied with where appli-cable.


1.10.3 Essential and emergency electrical equipment is tooperate satisfactorily under the conditions as shown in Table 2.1.1 for column-stabilised, tension-leg and self-elevat-ing units. For buoy and deep draught caisson units, theangles of inclination will be specially considered in each case.

1.11 Location and construction

1.11.1 The requirements for location and construction aregiven in IEC 61892-1 Sections 4.15 to 4.20 and Pt 6, Ch 2, 1.11 ofthe Rules for Ships, which are to be complied with.





1.6 Definitions

1.6.1 Definitions are given in Pt 6, Ch 2,1.6 of the Rulesfor Ships, as amended by 1.6.2 and 1.6.3; additional defini-tions are given in IEC 61892-1 Section 3.

1.6.2 Essential services are those necessary for thepropulsion and safety of the unit, such as the following:• abandonment systems dependent on electric power;• ventilation systems for hazardous areas and those

maintained at an overpressure to exclude the ingress ofdangerous gases;

• wellhead control and disconnection systems dependenton electric power;

• electric starting systems for oil engines;• other items as given in Pt 6, Ch 2,1.6.1 of the Rules for

Ships.

1.6.3 Services, such as the following, that are additionalto those in Pt 6, Ch 2,1.6.1 and 1.6.2 of the Rules for Ships,and are considered necessary to maintain the unit in a normaloperational and sea-going habitable condition:• drilling plant equipment;• processing and production equipment;• hotel services, other than those required for habitable

conditions;• thrusters, other than those for essential services; and• lifting appliances for the transfer of material, equipment

or personnel.

1.7 Design and construction of equipment

1.7.1 The requirements for design and construction aregiven in Pt 6, Ch 2,1.7 of the Rules for Ships, which are to becomplied with.

1.7.2 Additions or amendments to these requirements aregiven in 1.7.3.

1.7.3 Equipment or apparatus required to be suitable foruse in explosive gas atmosphere shall comply with therequirements of Pt 7, Ch 2,8, 9, 10 and 11, IEC 60092-502,IEC 61892-7 or alternative relevant International or NationalStandard.

Such equipment shall be constructed and tested inaccordance with the requirements of the IEC 60079 series (oralternative relevant International or National Standard) asrequired in IEC 61892-7 and be fit for purpose for the actualambient temperature and other environmental conditions tothe satisfaction of the LR Surveyor.

1.8 Quality of power supplies

1.8.1 The requirements for quality of power supplies aregiven in Pt 6, Ch 2,1.8 of the Rules for Ships, and IEC 61892-1Section 4.7, which are to be complied with.

1.9 Ambient reference conditions

1.9.1 The requirements for design and construction aregiven in Pt 6, Ch 2,1.9 of the Rules for Ships, which are to becomplied with where applicable.

1.13 Bonding for the control of static electricity

1.13.1 The requirements for earthing of non-current-carry-ing parts are given in Pt 6, Ch 2,1.13 of the Rules for Ships,IEC 60092-502 Section 5.5 and IEC 61892-6 Section 4,which are to be complied with where applicable.


1.13.3 Bonding straps for the control of static electricityare required for storage tanks, process plant and pipingsystems located in hazardous areas, or for products liable torelease flammable gases, which are not permanentlyconnected to the structure of the unit either directly or via theirbolted or welded supports and where the resistance betweenthem and the structure exceeds 1MΩ.

1.14 Alarms

1.14.1 The requirements for alarms are given inIEC 61892-2 Section 12 and Pt 6, Ch 2,1.14 of the Rules forShips, which are to be complied with.

1.15 Labels, signs and notices

1.15.1 The requirements for labels, signs and notices aregiven in Pt 6, Ch 2,1.15 of the Rules for Ships, which are to becomplied with.

1.16 Operation under fire conditions

1.16.1 The requirements for operation under fire condi-tions are given in Pt 6, Ch 2,1.16 of the Rules for Ships, whichare to be complied with. NOTE

• Fire safety stops, see also Pt 7, Ch 1,2.4.• Low location lighting, see also Pt 7, Ch 1,3.5.

1.17 Operation under flooding conditions

1.17.1 The requirements for operation under fire conditionsare given in Pt 6, Ch 2,1.17 of the Rules for Ships, which areto be complied with.

1.18 Protection of electrical equipment against theeffects of lightning strikes

1.18.1 The requirements for protection of electrical equip-ment against the effects of lightning strikes are given inIEC 61892-6 Section 16, IEC 60092-502 Section 5.6 andPt 6, Ch 2,1.18 of the Rules for Ships, which are to becomplied with.

1.19 Programmable electronic systems

1.19.1 The requirements for programmable electronicsystems are given in Pt 6, Ch 2,1.19 of the Rules for Ships,which are to be complied with.

1.11.3 Electrical equipment, as far as is practicable, is tobe located:(a) Such that it is accessible for the purpose of

maintenance and survey;(b) Clear of flammable material;(c) In spaces adequately ventilated to remove the waste

heat liberated by the equipment under full load condi-tions, at the ambient conditions specified in 1.9;

(d) Where flammable gases cannot accumulate. If this isnot practicable, electrical equipment is to comply withthe relevant requirements of Pt 7, Ch 2,8;

(e) Where it is not exposed to the risk of mechanical injuryor damage from water, steam or oil.

1.11.4 Equipment located in hazardous areas, or requiredto remain operational during catastrophic conditions, is tocomply with the relevant requirements of Pt 7, Ch 2,8.

1.11.5 Where electrical power is used for propulsion, theequipment is to be so arranged that it will operate satisfactorilyin the event of partial flooding by bilge water above the tanktop up to the bottom floor plate level, under the normal anglesof inclination given in 1.10 for essential electrical equipment,see Pt 5, Ch 13.

1.12 Earthing of non-current-carrying parts

1.12.1 The requirements for earthing of non-current-carrying parts are given in Pt 6, Ch 2,1.11 of the Rules forShips, and IEC 61892-6 which are to be complied with.


1.12.3 Where the current-carrying conductor exceeds 125mm2, a 64 mm2 earthing conductor is permitted, providedthat the circuit protection arrangements are such as willprevent an excessive temperature rise under fault conditions.Every other earthing conductor is to have a conductance notless than that specified for an equivalent copper earthingconductor.




Installations,components

Angle of inclination, degrees in any direction

Column-stabilised unitsand tension-leg units

Self-elevating units

Static StaticDynamic Dynamic

Essential electrical equipment

Electrical equipment for emergency services

Table 2.1.1 Inclination of other units

25 15 1525

1522,5 1015

Section 2Main source of electrical power

2.1 General

2.1.1 The main source of electrical power is to include atleast two generating sets and is to comply with the require-ments of this Section, Pt 6, Ch 2,2 of the Rules for Ships andIEC 61892-2 Section 4 without recourse to the emergencysource of electrical power.

2.2 Number and rating of generators andconverting equipment

2.2.1 The requirements for the number and rating ofgenerators and converting equipment are given in Pt 6, Ch 2,2.2 of the Rules for Ships, which are to be complied withwhere applicable. NOTE

The requirements are applicable when a unit is changing itslocation (self-propelled or towed) or stationary engaged in itsprimary function (e.g., oil storage or production).


2.2.3 On loss of power there is to be provision for auto-matic starting and connecting to the main switchboard of thestandby set and automatic sequential restarting of essentialservices, see 1.6.1, in as short a time as is practicable.

2.2.4 Where the prime mover starting time will result in astarting and connection time in excess of 45 seconds, detailsare to be submitted for consideration.

2.3 Starting arrangements

2.3.1 The requirements for starting arrangements aregiven in Pt 6, Ch 2,2.3 of the Rules for Ships, which are to becomplied with where applicable.

2.4 Prime mover governors

2.4.1 The requirements for prime mover governors aregiven in Pt 6, Ch 2,2.4 of the Rules for Ships, which are to becomplied with.

2.5 Main propulsion driven generators notforming part of the main source of electricalpower

2.5.1 The requirements for starting arrangements aregiven in Pt 6, Ch 2,2.5 of the Rules for Ships, which are to becomplied with.


Electrical Engineering Part 6, Chapter 2Sections 2 & 3

Section 3Emergency source of electricalpower

3.1 General

3.1.1 The general requirements for emergency source ofelectrical power are given in IEC 61892-2 Section 4 and Pt 6,Ch 2,3.3 of the Rules for Ships, which are to be complied withwhere applicable.


3.1.3 The emergency source of electrical power, associated transforming equipment, if any, transitional sourceof emergency power, emergency switchboard and emergency lighting switchboard are to be located in a non-hazardous space above the uppermost continuous deck andabove the worst damage waterline, inboard of the damageconditions in accordance with Pt 4, Ch 8. They are not to belocated forward of the collision bulkhead, where fitted on shipunits.

3.1.4 The space containing the emergency source ofelectrical power, associated transforming equipment, if any,the transitional source of emergency electrical power and theemergency switchboard is not to be contiguous to the bound-aries of hazardous areas.

3.1.5 The electrical power available is to be sufficient tosupply all those services that are essential for safety in anemergency, due regard being paid to such services as mayhave to be operated simultaneously. The emergency sourceof electrical power is to be capable, having regard to startingcurrents and the transitory nature of certain loads, of supplying simultaneously at least the following services for theperiods specified hereinafter, if they depend upon an electrical source for their operation:(a) For a period of 18 hours:

(i) in all service and accommodation alleyways, stairways and exits, personnel lift cars andpersonnel lift trunks;

(ii) in the machinery spaces and main generatingstations including their control positions;

(iii) in all control stations, machinery control rooms, andat each main and emergency switchboard;

(iv) at all stowage positions for fireman’s outfits;(v) at the steering gear; (vi) at the emergency fire pump, at the sprinkler pump,

if any, and at the emergency bilge pump, if any, andat the starting positions of their motors;

(vii) in any stored oil pump-room;(viii) at every survival craft preparation station, muster

and embarkation station and over the sides;(ix) on helicopter decks; and(x) in all spaces from which control of the drilling

process is performed and where controls ofmachinery essential for the performance of thisprocess, or devices for emergency switching off ofthe power plant, are located.


(b) For a period of 18 hours:(i) the navigation lights and other lights required by the

International Regulations for the Prevention ofCollisions at Sea in force;

(ii) the radiocommunications, as required byAmendments to SOLAS 1974, Chapter IV;

(iii) permanently installed diving equipment necessaryfor the safe conduct of diving operations, ifdependent upon the unit’s electrical power;

(iv) the emergency fire pump if dependent upon theemergency generator for its source of power;

(v) one of the refrigerated liquid carbon dioxide unitsintended for fire protection, where both areelectrically driven;

(vi) on column-stabilised units: ballast valve controlsystem, ballast valve position indicating system,draft level indicating system, tank level indicatingsystem, and the largest single ballast pump;

(vii) abandonment systems dependent on electricpower; and

(viii) helicopter deck perimeter lights and helideck statuslights, wind direction indicator illumination, andrelated obstruction lights.

(c) For a period of 18 hours: (i) the navigational aids as required by Amendments

to SOLAS 1974 Regulations V/12 as applicable;(ii) general alarm and internal communication systems

required in an emergency;(iii) intermittent operation of the daylight signalling lamp

and the unit’s whistle;(iv) the fire and gas detection systems and their alarms;(v) the capability of closing the blow out preventer and

of disconnecting the unit from the wellheadarrangement, if electrically controlled, unless suchservices have an independent supply from an accumulator battery suitably located for use in anemergency and sufficient for the period of 18 hours.

(d) The steering gear for the period of time required by Pt 5, Ch 19,6.

(e) For a period of four days, any signalling lights or soundsignals which may be required for marking offshorestructures, unless such services have an independentsupply from an accumulator battery suitably located for use in an emergency and sufficient for the period offour days.

(f) For a period of half an hour: (i) power to operate any watertight doors, but not

necessarily all of them simultaneously, unless anindependent temporary source of stored energy isprovided; and

(ii) power to operate the controls and indicatorsprovided.

(g) Where applicable, the services required by Pt 6, Ch 2,2.3.2 of the Rules for Ships.

3.1.6 The emergency source of electrical power may beeither a generator or an accumulator battery, which is tocomply with the requirements given in Pt 6, Ch 2,3.3.8 of theRules for Ships.

3.1.7 The transitional source of emergency electricalpower, where required by 3.1.6, is to consist of an accumulator battery suitably located for use in an emergency,which is to operate without recharging while maintaining thevoltage of the battery throughout the discharge period within



12 per cent above or below its nominal voltage and be ofsufficient capacity, and be so arranged as to supply automatically in the event of failure of either the main or theemergency source of electrical power for half an hour at leastthe following services if they depend upon an electrical sourcefor their operation:(a) the lighting required by 3.1.5(a) and 3.1.5(b)(i). For this

transitional phase, the required emergency electric lighting, inrespect of the machinery space and accommodationand service spaces may be provided by permanentlyfixed, individual, automatically charged, relay operatedaccumulator lamps, and

(b) all services required by 3.1.5(b)(ii) and 3.1.5(c) unlesssuch services have an independent supply for the periodspecified from an accumulator battery suitably locatedfor use in an emergency.

3.2 Starting arrangements

3.2.1 Where the emergency source of power is a generator, the starting arrangements are to comply with therequirements given in Pt 5, Ch 2,8.14.

3.3 Prime mover governor

3.3.1 Where the emergency source of power is a generator, the governor is to comply with 2.4.

3.4 Radio installation

3.4.1 The requirements for radio installation are given inPt 6, Ch 2,3.6 of the Rules for Ships, which are to becomplied with.

3.5 Accommodation units

3.5.1 The emergency source of electrical power in unitscarrying more than 50 persons, who are not crew members orpassengers, is to comply with the requirements of Pt 3,Ch 4,4.

Section 4External source of electricalpower

4.1 Temporary external supply

4.1.1 The requirements for temporary external supply aregiven in Pt 6, Ch 2,4.1 of the Rules for Ships, which are to becomplied with.

4.2 Permanent external supply

4.2.1 The requirements for permanent external supplyare given in Pt 6, Ch 2,4.2 of the Rules for Ships, which are tobe complied with.




Section 5Supply and distribution

5.1 Systems of supply and distribution

5.1.1 The requirements for systems of supply and distri-bution are given in Pt 6, Ch 2,5.1 of the Rules for Ships, whichare to be complied with where applicable.


5.1.3 The following systems of generation and distribu-tion are acceptable:(a) d.c., two-wire, insulated;(b) a.c., single-phase, two-wire, insulated;(c) a.c., three-phase, three-wire, insulated;(d) earthed systems, a.c. or d.c.The following neutral earthing methods are permitted:• Directly earthed TN System• Impedance earthed IT System• Isolated IT SystemEarthing systems are to comply with IEC 61892-2 Section 5and IEC 60092-502 Section 5.While both insulated and earthed distribution systems arepermitted, systems with a hull or structure return are notpermitted, with the exception of:• limited and locally earthed systems outside any

hazardous area;• intrinsically safe systems;• impressed current cathodic protection systems.NOTE

IEC 61892-2 Table 1 summarises the principal features of theneutral earthing methods.Systems installed in hazardous areas shall comply with therequirements of Pt 7, Ch 2,8, 9, 10 and 11.In hazardous areas (where inflammable gas may be presentas defined in IEC 60092-502 Section 4) a.c. systems are to beearthed to comply with IEC 60079-14, in particular Section 6‘Protection from dangerous (incendive) sparking’, and bearranged so that no current arising from an earth fault in anypart of the system could pass through extraneous metalworklocated in a hazardous area.Earthed intrinsically safe circuits are permitted to pass intoand through hazardous areas.

5.2 Essential services

5.2.1 The requirements for essential services are given inPt 6, Ch 2,5.2 of the Rules for Ships, which are to becomplied with.

5.3 Isolation and switching

5.3.1 The requirements for isolation and switching aregiven in Pt 6, Ch 2,5.3 of the Rules for Ships, which are to becomplied with.

5.3.2 Devices selected for isolation of circuits up to andincluding 1000V a.c or 1500V d.c. shall comply with the rele-vant National and International Standards.

5.4 Insulated distribution systems (IT systems)

5.4.1 The requirements for insulated distribution systemsare given in Pt 6, Ch 2,5.4 of the Rules for Ships, which are tobe complied with.

5.4.2 IT systems (neutral isolated from earth or earthedthrough a high impedance) shall meet the requirements of IEC61892-2, IEC 60092-502 and IEC 60079-14.

5.5 Earthed distribution systems (TN systems)

5.5.1 The requirements for earthed distribution systemsare given in Pt 6, Ch 2,5.5 of the Rules for Ships, which are tobe complied with where applicable.

5.5.2 Earthed Distribution Systems (TN Systems) shallmeet the requirements of IEC 61892-2, IEC 60092-502 andIEC 60079-14.

5.6 Diversity factor

5.6.1 The requirements for the diversity factor are given inIEC 61892-2 Section 8 and Pt 6, Ch 2,5.6 of the Rules forShips, which are to be complied with.

5.7 Lighting circuits

5.7.1 The requirements for lighting circuits are given inIEC 61892-2 Section 11 and Pt 6, Ch 2,5.7 of the Rules forShips, which are to be complied with.

5.7.2 Additions or amendments to these requirementsare given in 5.7.3 and 5.7.4.

5.7.3 Emergency lighting fittings supplied by a centralbattery system or UPS are to be connected to the powersource using fire resistant cables and comply with the rele-vant National and International Standards.

5.7.4 Where lighting circuits in a pump-room adjacent toa storage tank are also used for emergency lighting, and havebeen interlocked with ventilation, the interlocking arrange-ments are:• not to cause the lighting to go out following a failure of

the ventilation system; and• not to prevent operation of the emergency lighting

following the loss of the main source of electrical power.

5.8 Motor circuits

5.8.1 A separate final sub-circuit is to be provided forevery motor for essential services, see 1.6.1.

5.9 Motor control

5.9.1 The requirements for motor control are given in IEC 61892-2 Section 7.8 and Pt 6, Ch 2,5.9 of the Rules forShips, which are to be complied with.


Section 6System design - Protection

6.1 General

6.1.1 The general requirements for protection are givenin Pt 6, Ch 2,6.1 of the Rules for Ships, which are to becomplied with.

6.2 Protection against short-circuit

6.2.1 The general requirements for protection againstshort-circuit are given in IEC 61892-2 Section 10 and Pt 6,Ch 2,6.2 of the Rules for Ships, which are to be compliedwith.

6.3 Protection against overload

6.3.1 The general requirements for protection againstoverload are given in Pt 6, Ch 2,6.3 of the Rules for Ships,which are to be complied with.

6.4 Protection against earth faults

6.4.1 The general requirements for protection againstshort-circuit are given in Pt 6, Ch 2,6.4 of the Rules for Ships,which are to be complied with.


6.4.3 Where any circuit, other than an intrinsically safecircuit, passes into or through any Zone 0 area, the circuit isto be disconnected automatically and/or is to be preventedfrom being energised in the event of an abnormally low level ofinsulation resistance and/or high level of leakage current.

6.4.4 Where a circuit passes into any zone 0 area, theprotective systems shall be arranged so that manual inter-vention is necessary for the reconnection of the circuit afterdisconnection as the result of a short-circuit, overload orearth-fault condition.

6.5 Circuit-breakers

6.5.1 The requirements for circuit-breakers are given inPt 6, Ch 2,6.5 of the Rules for Ships, which are to becomplied with.

6.6 Fuses

6.6.1 The requirements for fuses are given in Pt 6, Ch 2,6.6 of the Rules for Ships, which are to be compliedwith.




6.6.3 The use of fuses for overload protection is permit-ted up to 320A, provided they have suitable characteristics,but the use of circuit-breakers or similar devices is recom-mended above 200A. For high voltage a.c. systems (above1000V), the use of fuses for overload protection is not accept-able.Is LimitersThe use of Is Limiters is permitted in situations where circuit-breakers cannot provide any protection against unduly highpeak short-circuit currents, as circuit-breakers are too slow.NOTE

Only the Is Limiter is capable of detecting and limiting a short-circuit current at the first rise, i.e., in less than 1 ms. Themaximum instantaneous current occurring remains well belowthe level of the peak short-circuit current.

6.7 Circuit-breakers requiring back-up by fuse orother device

6.7.1 The requirements for circuit-breakers requiringback-up by fuse or other devices are given in Pt 6, Ch 2,6.7of the Rules for Ships and IEC 61892-2 Section 10.2.3, whichare to be complied with.

6.8 Protection of generators

6.8.1 The requirements for the protection of generatorsare given in Pt 6, Ch 2,6.8 of the Rules for Ships and IEC61892-2 Section 10.4.2, which are to be complied with.

6.8.2 Additions or amendments to these requirements aregiven in 6.8.3.

6.8.3 Where generators are intended to operate in parallel:(a) Generator circuit-breakers shall be capable of inter-

rupting the fault current resulting from a short-circuitoccurring between the generator and its circuit-breaker.

(b) Undervoltage protection shall be provided to preventthe generator circuit-breaker from closing if the gener-ator is not generating, in accordance with Section10.5.1 of IEC 61892-2.

6.9 Load management

6.9.1 The requirements for load management are givenin IEC 61892-5 Section 9.9.2, IEC 60092-504 and Pt 6, Ch 2,6.9 of the Rules for Ships, which are to be complied withwhere applicable.




Electrical Engineering Part 6, Chapter 2Sections 6 to 9

6.9.3 Arrangements are to be made to disconnect auto-matically, after an appropriate time delay, circuits of thecategories noted below, when the generator(s) is/are over-loaded, sufficient to ensure the connected generating set(s)is/are not overloaded:• non-essential circuits;• circuits feeding services for habitability, see Pt 6,

Ch 2,1.6.2 of the Rules for Ships; and• circuits for other essential services, when it can be

established that safe operation can be maintained duringthe temporary loss of such services.

6.10 Feeder circuits

6.10.1 The requirements for feeder circuits are given inIEC 61892-2 Section 10.4.5 and Pt 6, Ch 2,6.10 of the Rulesfor Ships, which are to be complied with as applicable.

6.11 Motor circuits

6.11.1 The requirements for motor circuits are given in IEC 61892-2 Section 10.4.6 and Pt 6, Ch 2,6.11 of the Rulesfor Ships, which are to be complied with where applicable.

6.12 Protection of transformers

6.12.1 The requirements for protection of transformers aregiven in IEC 61892-2 Section 10.4.4 and Pt 6, Ch 2,6.12 ofthe Rules for Ships, which are to be complied with.

6.13 Harmonic filters

6.13.1 The requirements for protection of transformers aregiven in Pt 6, Ch 2,6.13 of the Rules for Ships, which are tobe complied with.

Section 7Switchgear and control gearassemblies

7.1 Construction and testing

7.1.1 The requirements for construction and testing ofswitchgear and control gear assemblies and their compo-nents are given in IEC 61892-3 Section 7 and Pt 6, Ch 2,7 ofthe Rules for Ships, which are to be complied with.

7.2 Position of switchboards

7.2.1 The requirements for the positioning of switch-boards are given in Pt 6, Ch 2,7.16 of the Rules for Ships,which are to be complied with where applicable.


7.2.3 So far as possible, pipes are not to be installeddirectly above, in front of or behind switchboards, sectionboards and distribution boards. If such placing is unavoidable,suitable protection is to be provided in these positions, seePt 5, Ch 13,2.

Section 8Protection from electric archazards within electricalequipment

8.1 Hazard identification, calculations and testing

8.1.1 The requirements for protection from electric archazards within electrical equipment are given in Pt 6, Ch 2,8of the Rules for Ships, which are to be complied with.

Section 9Rotating machines

9.1 Construction, performance, control andtesting

9.1.1 The requirements for construction, performance,control and testing of rotating machines are given inIEC 61892-3 Section 5 and Pt 6, Ch 2,9 of the Rules forShips, which are to be complied with.

9.1.2 Additions or amendments to these requirementsare given in 9.2.

9.2 Temperature rise

9.2.1 The limits of temperature rise specified in Table 2.9.1 in Pt 6, Ch 2,9 of the Rules for Ships are based onthe cooling air temperature and cooling water temperaturegiven in 1.9.3(a).

9.2.2 If it is known that the temperature of coolingmedium exceeds the values given in 1.9.3(a) the permissibletemperature rise is to be reduced by an amount equal to theexcess temperature of the cooling medium.

9.2.3 If it is known that the temperature of coolingmedium will be permanently less than the values given in1.9.3(a) the permissible temperature rise may be increasedby an amount equal to the difference between the declaredtemperature and that given in 1.9.3(a), up to a maximum of15°C.


Section 10Converter equipment

10.1 Transformers

10.1.1 The requirements for transformers are given in IEC 61892-3 Section 6 and Pt 6, Ch 2,10.1 of the Rules forShips, which are to be complied with where applicable.


10.1.3 Transformers are to comply with the requirementsof IEC Publication 60076: Power Transformers, or an accept-able and relevant National Standard, amended wherenecessary for ambient temperature, see 1.9.

10.2 Semi-conductor equipment

10.2.1 The requirements for semi-conductor equipmentare given in IEC 61892-3 Section 8 and Pt 6, Ch 2,10.2 of theRules for Ships, which are to be complied with where appli-cable.


10.2.3 Semi-conductor equipment is to comply with therequirements of IEC 60146: Semi-conductor Convertors, oran acceptable and relevant National Standard, amendedwhere necessary for ambient temperature, see 1.9.

10.3 Uninterruptible power systems (UPS)

9.3.1 The requirements for uninterruptible power systemsare given in IEC 61892-3 Sections 8 and 9, and Pt 6,Ch 2,10.3 of the Rules for Ships, which are to be compliedwith.


10.3.3 UPS units are to comply with the requirements ofIEC 62040: Uninterruptible power systems, or an acceptableand relevant National Standard amended where necessary forambient temperature, see 1.9.


Electrical Engineering Part 6, Chapter 2Sections 10, 11 & 12

Section 11Electrical cables and busbartrunking systems (busways)

11.1 Construction, selection, installation andtesting

11.1.1 The requirements for construction, selection, instal-lation and testing of electrical cables and busbar trunkingsystems (busways) are given in IEC 61892-6 Section 5 andPt 6, Ch 2,11 of the Rules for Ships, which are to be compliedwith.

11.1.2 Additions or amendments to these requirementsare given in 11.2.

11.2 Busbar trunking systems (bustrunks)

11.2.1 Where the busbar trunking system is employed forcircuits on and below the freeboard deck, arrangements areto be made to ensure that circuits on other decks are notaffected in the event of partial flooding under the normalangles of inclination given in 1.10 for essential electrical equip-ment.

Section 12Batteries

12.1 Secondary batteries of the vented and valveregulated sealed type

12.1.1 The requirements for batteries of the vented andvalve regulated sealed type are given in IEC 61892-3Section 9 and Pt 6, Ch 2,12 of the Rules for Ships, which areto be complied with.

12.2 Sealed batteries

12.2.1 A sealed battery is hermetically closed; it may beequipped with a safety device to prevent dangerously highinternal pressure.

12.2.2 The installation of sealed batteries is required tocomply with the above referenced Section of the Rules forShips only in respect of protection against mechanicaldamage, charging arrangements and the recording of batteries for emergency and essential services.

12.2.3 The relevant requirements for location are given inPt 6, Ch 2,12.3.5, 12.3.7 and 12.3.8 of the Rules for Ships,which are to be complied with where applicable.

12.2.4 The relevant requirements for charging facilities aregiven in Pt 6, Ch 2,12.6 of the Rules for Ships, which are to becomplied with where applicable.

12.2.5 The requirements for recording of batteries for emer-gency and essential services are given in Pt 6, Ch 2,12.7 ofthe Rules for Ships.




Section 13Equipment – Heating, lighting andaccessories, electric traceheating, underwater systems andrefrigeration

13.1 Heating and cooking equipment, lighting,socket outlets and plugs, and enclosures

13.1.1 The requirements for heating and cooking equip-ment, lighting, socket outlets and plugs, and equipmentenclosures are given in IEC 61892-3 and Pt 6, Ch 2,13 of theRules for Ships, which are to be complied with.

13.2 Electric trace heating

13.2.2 Electric trace heating shall comply with IEC 61892-3Section 12, trace heating installations in hazardous areas shallcomply with IEC 60079 series or a relevant International orNational Standard.

13.3 Underwater systems/impressed currentcathodic protection

13.3.1 Underwater systems and appliances are to complywith IEC 61892-3 Section 14. To facilitate diving operationsprovision is to be made to isolate Impressed Current CathodicProtection Systems.

13.4 Refrigeration

13.4.1 Refrigeration required in units to facilitate LNGproduction and/or cryogenic storage is to comply with therequirements of the Classification of Offshore LNG Productionand Storage Installations Guidance Notes Rpt. No: GN 02015and IEC 60092-502. Control and instrumentation associatedwith refrigeration systems is to comply with IEC 60092-504.

13.4.2 For LR approval of LNG refrigeration/reliquefactionsystem, the plant is to be considered as a self-containedessential system. Therefore, approval procedures will beperformed for the complete plant as well as the major items ofequipment.

13.4.3 Electrical, control and instrumentation equipmentis to be suitable for its intended purpose and accordingly,whenever practicable, is to be selected from the List of TypeProducts published by LR. A copy of the procedure for LRType approval System will be supplied on application.

Section 14Signalling lights and sound signals

14.1 General

14.1.1 Signalling lights or sound signals required for mark-ing offshore structures detailed in 15.7 and 15.9 are to be fedfrom an emergency source of electrical power, see 3.1.5(e).

Section 15Navigation and manoeuvringsystems

15.1 Steering gear

15.1.1 The requirements for steering gear are given in Pt 6, Ch 2,15.1 of the Rules for Ships, which are to becomplied with where applicable.


15.1.3 These requirements are to be read in conjunctionwith those in Pt 5, Ch 19.

15.2 Thruster systems for steering

15.2.1 Where azimuth or rotatable thruster units, used asthe sole means of steering, are electrically driven, the require-ments of Pt 5, Ch 20,5.1 are to be complied with.

15.3 Thruster systems for dynamic positioning

15.3.1 For units having a DP class notation the require-ments of Pt 3, Ch 9 are to be complied with.

15.4 Thruster systems for manoeuvring

15.4.1 Where a thruster system is fitted solely for thepurpose of manoeuvring, and is electrically driven, the require-ments of Pt 6, Ch 2,15.4 of the Rules for Ships are to becomplied with.

15.5 Transverse thrust units

15.5.1 Where transverse units are remotely controlled, therequirements of Pt 6, Ch 2,15.5 of the Rules for Ships are tobe complied with.


15.6 Thruster systems for thruster-assistedmooring systems

15.6.1 For units having a thruster-assisted positionalmooring system the requirements of Pt 3, Ch 10 are to becomplied with.

15.7 Navigation lights and sound signals

15.7.1 The requirements for navigation lights are given in IEC 61892-5 Section 7 and Pt 6, Ch 2,15.6 of the Rules forShips, which are to be complied with where applicable.


15.7.3 If the unit is capable of a self-propelled passage,‘steaming lights’ shall be provided to comply with TheInternational Regulations for Preventing Collisions at Sea(COLREGS) to include masthead, side, stern and anchor, notunder command, restricted manoeuvrability, appropriatesound signals (for fog, at anchor or aground, etc.) and, ifapplicable, special-purpose lights. Navigation lights are to beconnected separately to a distribution board reserved for thispurpose only, and accessible to the Officer of the Watch. Thedistribution board is to be connected directly or throughtransformers to the emergency source of electrical power, incompliance with 3.1.5(b)(i) and 3.1.7(b). Disconnectable unitsare permitted for this purpose, i.e., for when the unit is notstationary and engaged in operations.

15.7.4 Consideration should be given to fitting anAutomatic Identification System (AIS) and Racon Beacon tothe unit.NOTES

1. AIS is an automated tracking system used on ships,mobile and fixed offshore units for identifying and locat-ing vessels and fixed installations by electronicallyexchanging data with other nearby ships or installa-tions. This would enable nearby vessels positively toidentify and locate the unit, thus aiding the ship'smarine radar in collision avoidance.

2. A Racon is a radar transponder commonly used tomark maritime navigational hazards. The word is a port-manteau of RAdar and beaCON. When a Raconreceives a radar pulse, it responds with a signal on thesame frequency which puts an image on the vessel'sradar display.

15.8 Navigational aids

15.8.1 Navigational aids as required by SOLAS are to befed from the emergency source of electrical power, see alsoPt 6, Ch 2,3.3.7(d)(ii) of the Rules for Ships, which are to becomplied with.

15.8.2 When a unit is stationary and engaged inoperations, navigation aids (lanterns and sound signals) shallbe provided in accordance with the International Associationof Marine Aids to Navigation and Lighthouse Authorities(IALA) requirements and the requirements of the coastal statein whose territorial sea or on whose continental shelf the unitis operating.



15.9 Helideck and Aircraft Warning Lights

15.9.1 Helideck perimeter lighting, helideck floodlights,aircraft warning lights, status (wave-off) lights and Unit identi-fication signage are to comply with UK Standard CAP 437 orthe requirements of the coastal state in whose territorial sea oron whose continental shelf the unit is operating.NOTE

In UK waters, some permanently manned facilities havedispensation for the non fitment of status lights as theonboard personnel would alert incoming aircraft of potentialdangers.

15.9.2 Helideck perimeter lighting, helideck floodlights,aircraft warning lights and status lights are to be supplied bya UPS backed supply.The UPS autonomy is to be agreed with LR and the unitOwner and be in accordance with the requirements of anyrelevant Statutory Regulations of the National Administrationsin the country of registration and area of operation.

Section 16Electric propulsion

16.1 General

16.1.1 The requirements for electric propulsion are givenin Pt 6, Ch 2,16 of the Rules for Ships, which are to becomplied with. This Section applies to disconnectable self-propelled units or units which use their thrusters to stay onstation or to move off-station (e.g., in adverse weather condi-tions). Thruster systems fitted for the purpose of manoeuvringor steering are to comply with Section 15.

Section 17Testing and trials

17.1 Testing

17.1.1 The requirements for testing are given in Pt 6, Ch 2,21.1 of the Rules for Ships, which are to be compliedwith where applicable.

17.2 Trials

17.2.1 The requirements for trials are given in Pt 6, Ch 2,21.2 of the Rules for Ships, which are to be compliedwith where applicable.

17.3 High voltage cables

17.3.1 The requirements for high voltage cables are givenin Pt 6, Ch 2,21.3 of the Rules for Ships, which are to becomplied with where applicable.




17.4 Hazardous areas

17.4.1 The requirements for testing of electrical equipmentlocated in hazardous areas are given in Pt 6, Ch 2,21.4 of theRules for Ships, which are to be complied with where appli-cable.NOTE

For hazardous areas, see Pt 7, Ch 2.

Section 18Spare gear

18.1 General

18.1.1 The general requirements for spare gear are givenin Pt 6, Ch 2,22.1 of the Rules for Ships, which are to becomplied with.


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