1. PLATFORM UTILITIES
PAB 2073
Reference: PCSB/PMO document

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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. Air receiver/Storage vessel
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

10. Air Dryers Distribution pipings
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

13. 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

15. 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

16. 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)

17. 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

19. 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

20. 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