PLATFORM UTILITIES PAB 2073 Reference: PCSB/PMO document.

PLATFORM UTILITIES

PAB 2073

Reference: PCSB/PMO document

Firewater system Instrument air system Starting air system Seawater and potable water system Electric power generation

Firewater System

Platform are equipped with extensive fire fighting facilities to extinguish and control spread and damage of fires

Main components Firewater pumps Firewater ring main Firewater deluge system

Platform may have minimum 2 FWPs to provide high-pressure water to FW rings and FW deluge systems

FW Pumps Located 20 feet below sea level Multi-stage submersible centrifugal pumps Their shafts hung-off in a caisson Use liquid fuel for its engine Set to turn on when fire alarm sounded or when

pressure in firewater ring main drops below certain pressure

Firewater delivery classified in 2 ways Fixed Active

Fixed – FW deluge system for each module and sprinkler for LQ

Active – FW ring main and associated FW monitors, hose reels, light water station

FW deluge system Deluge - ‘ to wash’, ‘to flood’ Deluge system supplies water to cool equipment

in event of fire Modules with high electrical equipment and low

inventory of fuel usually do not have deluge System 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 LQ Sprinkler system in event of fire in living quarters Consists of

Line from FWP discharge pipings throughout the LQ nozzles that open when fusible plug melts System to charge and flush with water

INSTRUMENT AIR SYSTEM

Instrument air system provides air for all pneumatic controls Valve actuators Service air for tools, air motors, and starters

The system consists of Air compressors Air storage /receiver Air dryers Piping system

Air compressors Takes atmospheric air, filter it, compress it, cool it

and deliver it to instrument/service air receiver Have 2 units, one operating, one standby

Air receiver/Storage vessel Stores compressed air to provide additional

capacity when required

Air Dryers Removes water vapour from air as it can clog the

small orifices in instruments Has 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 pipings Runs throughout entire platform

STARTING AIR SYSTEM

Supply air to start motors on generators and diesel engines

Has pair of air compressors, vessel for air storage (receiver), distribution piping system

No need dryer Not continuously used – only in utilities,

power generation modules and cranes

SEAWATER AND POTABLE WATER SYSTEM

Seawater is used for many purposes: Heating, Ventilation and Air-conditioning (HVAC) Living Quarters kitchen and toilets Firewater ring main pressurisation facility Water injection Drilling facilities Sand jetting system Sewage treatment

Potable means drinkable Seawater treated using chemicals or

methods such as reverse-osmosis Supplies fresh water to LQ for drinking,

washing, showers, cooking Provides water for emergency uses such as

eyewash, shower stations (washdown facilities)

• Components of seawater and potable water supply system• Seawater lift pumps• Watermakers to convert seawater into potable

water• Water storage tanks and pumps• UV sterilizer to kill bacteria• Distribution pipings

ELECTRIC POWER GENERATION

Electric power is generated on all platforms Power generated at 50 – 60 Hz, 480 V up to

4160 V depending on the size of motors requiring the voltage

Use 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 panels

Panels provide electric power to individual pieces of equipment such as Electric motors for pumps, fans, air compressors Air conditioning, lighting, battery charging Electronic controls and communication equipment