6.Platform Utilities

PLATFORM UTILITIESPAB 2073 Reference: PCSB/PMO document

Firewater systemInstrument air systemStarting air systemSeawater and potable water systemElectric power generation

Firewater SystemPlatform are equipped with extensive fire fighting facilities to extinguish and control spread and damage of firesMain componentsFirewater pumpsFirewater ring mainFirewater deluge system

Platform may have minimum 2 FWPs to provide high-pressure water to FW rings and FW deluge systemsFW PumpsLocated 20 feet below sea levelMulti-stage submersible centrifugal pumpsTheir shafts hung-off in a caissonUse liquid fuel for its engineSet to turn on when fire alarm sounded or when pressure in firewater ring main drops below certain pressure

Firewater delivery classified in 2 waysFixedActiveFixed FW deluge system for each module and sprinkler for LQActive FW ring main and associated FW monitors, hose reels, light water station

FW deluge systemDeluge - to wash, to floodDeluge system supplies water to cool equipment in event of fireModules with high electrical equipment and low inventory of fuel usually do not have delugeSystem has a valve tied to FW pump discharge, main line to the module and a distribution system around the module with nozzles directed to specific equipment

Sprinkler in LQSprinkler system in event of fire in living quartersConsists ofLine from FWP dischargepipings throughout the LQnozzles that open when fusible plug meltsSystem to charge and flush with water

INSTRUMENT AIR SYSTEMInstrument air system provides air for all pneumatic controlsValve actuatorsService air for tools, air motors, and startersThe system consists of Air compressorsAir storage /receiverAir dryers Piping system

Air compressorsTakes atmospheric air, filter it, compress it, cool it and deliver it to instrument/service air receiverHave 2 units, one operating, one standby

Air receiver/Storage vesselStores compressed air to provide additional capacity when required

Air DryersRemoves water vapour from air as it can clog the small orifices in instrumentsHas 2 vessels containing silica gel (dry desiccant)Air will flow into one vessel, after certain pressure the vessel is closed and the desiccant is regenerated (dried) while air flows into the other vessel

Distribution pipingsRuns throughout entire platform

STARTING AIR SYSTEMSupply air to start motors on generators and diesel enginesHas pair of air compressors, vessel for air storage (receiver), distribution piping systemNo need dryerNot continuously used only in utilities, power generation modules and cranes

SEAWATER AND POTABLE WATER SYSTEMSeawater is used for many purposes:Heating, Ventilation and Air-conditioning (HVAC)Living Quarters kitchen and toiletsFirewater ring main pressurisation facilityWater injectionDrilling facilitiesSand jetting systemSewage treatment

Potable means drinkableSeawater treated using chemicals or methods such as reverse-osmosisSupplies fresh water to LQ for drinking, washing, showers, cookingProvides water for emergency uses such as eyewash, shower stations (washdown facilities)

Components of seawater and potable water supply systemSeawater lift pumpsWatermakers to convert seawater into potable waterWater storage tanks and pumpsUV sterilizer to kill bacteriaDistribution pipings

ELECTRIC POWER GENERATIONElectric power is generated on all platformsPower generated at 50 60 Hz, 480 V up to 4160 V depending on the size of motors requiring the voltageUse step down transformers to provide power to equipment at lower voltages

Power from electric generators run to a central control/switchgear room tied to motor control center (MCC) panels/central power distribution panelsPanels provide electric power to individual pieces of equipment such asElectric motors for pumps, fans, air compressorsAir conditioning, lighting, battery chargingElectronic controls and communication equipment