Arthit Platform

Fire & Gas Detection Philosophy

Type of Fire & Gas (F&G) detectorsInstallationVoting philosophyAutomatic action by SIS (Safety Instrumented

System)Automatic action by Addressable Fire Panel

(For ALQB) F&G in Turbo Machinery PackagesDeluge SystemFire Water Pumps

Content

Flame DetectorFusible Plug LoopGas Detector (Point Type)Gas Detector (Line of Sight)VESDA (Very Early Smoke Detection Apparatus)Smoke DetectorHeat DetectorEmergency Shutdown PushbuttonManual Alarm Call pointSpecial

Type of F&G detectors

Multi spectrum IR Flame DetectorInstallation

All decks on APPField of View

Distance 30 m.90 degree horizontal75 degree vertical

Flame Detector

One flame detector – alarm onlyAt least two flame detector in same fire zone

Activate ESD1 on APPActivate deluge valve in that fire zoneStart fire water pumpsPAGA tone 2

Flame Detector

2oo27 Voting of flame detectors

Flame Detector

2oo2 Voting of flame detectors

Special ActionInhibit FWPs on APP to startDeluge valve NOT activated (no deluge in this fire zone)

Flame Detector

Fusible plugs are fixed temperature heat detectors that melt at the required temperature.

Fire detection is due to loss of air/gas pressure in the fusible plug loop.

Melt point is 203 DegF (95 DegC) on AWPsMelt point is 160 DegF (71 DegC) on APP

Fusible Plug

Fusible plug melt on APPActivate deluge valve in that fire zoneStart fire water pumps (due to fire water ring main

pressure low)

Fusible plug melt on AWP1Activate ESD1 on AWP1Activate deluge valve to AWP1Start fire water pumps (due to fire water ring main

pressure low)

Fusible plug melt on AWPsActivate ESD1 on AWPs

Fusible Plug

SpecialFusible plugs were provided at each riser valve

to directly close the valves when exposed to a fire.

Fusible Plug

The Deluge system is designed to protect high hazard areas containing a severe fuel hazard with a high heat release rate by bringing a large number of open sprayers into action simultaneously in the event of a fire. 

Deluge System

P&ID

Deluge System

5 Deluge valve for APP2 for lower deck – always open together

XV-5650 and XV-56602 for main deck – always open together

XV-5670 and XV-56801 for upper deck

XV-5690

1 Deluge valve for AWP1XV-5640

Deluge System

How many ways to activate deluge?Fusible plug meltSIS energize solenoid when confirm fireManually press hand switch at localManually press push button in CCR

Deluge System

SpecialManually press deluge push button in CCR will;

Activate ESD1 on APPStart fire water pumpsPAGA tone 2

Note: for AWP1 will be activate ESD1 on AWP1 only

Deluge System

The Fire Water Manifold is pressurized at 10 barg by utility water pumps. When the pressure drops to 6.5 barg or Confirmed Fire/Gas the first Fire Water Pump in the preset start sequence starts. If the manifold pressure do not build to 10 barg in 30 seconds, the second pump starts. If the manifold pressure still does not reach 10 barg in another 30 seconds, the third pump starts. If 1st FW pump start and build pressure to 10 barg within 30s.

2nd FW pump will not start But if the pressure drop below 10 barg after 30s. 2nd pump will

start. After 2nd pump start, if pressure drop below 10 barg, 3rd pump

will start. (With 30 seconds delay after 2nd pump started)This logic is to prevent FW pumps start consecutively within

30 seconds

Fire Water Pumps Start Sequence

Infrared Hydrocarbon Gas DetectorInstallation

All decks on APPTheory of Operation

Certain IR wavelengths are absorbed by the gas

Gas Detector (Point Type)

Infrared Hydrocarbon Gas DetectorTransmitter

Transmitter produces an intense, collimated infrared beam which is produced by a Xenon arc flash lamp.

Receiver Receiver collects infrared radiation from the

transmitter and performs measurements to enable hydrocarbon gases in the beam path to be detected.

InstallationAll decks on APP

Theory of OperationCertain IR wavelengths are absorbed by the gas

Gas Detector (Line of Sight)

One gas detector more than 20% LEL – alarm only

In process area (within same fire zone)One gas detector more than 20% LEL

AndOne gas detector more than 60% LEL

Activate ESD1Start fire water pumpsPAGA tone 2

Gas Detector (Point type + Line of Sight)

Inlet enclosure of turbo machinery (within same fire zone)Two gas detector more than 40% LEL (2ooN)

Activate ESD1Start fire water pumpsPAGA tone 2Isolate essential power to turbo machinery package

Gas Detector (Point type)

In HVAC air inlet LER, SWR (within same fire zone)Two gas detectors more than 40% LEL (2ooN)

Activate ESD1Start fire water pumpsPAGA tone 2Trip HVAC, close fire dampers

Gas Detector (Point type)

In LER, SWR (within same fire zone)Two gas detectors more than 40% LEL (2ooN)

Activate ESD1Start fire water pumpsPAGA tone 2Trip HVAC, close fire dampersIsolate battery of UPS and Battery Charger. (10 s

delay)This will lead to black-out. SIS loss power. EDG can

not start.

Gas detector in airlock is alarm only

Gas Detector (Point type)

AQP Main deckOne gas detector more than 20% LEL

AndOne gas detector more than 60% LEL

Activate ESD1Inhibit AQP fire water pump to startStart fire water pumps on APPPAGA tone 2Stop/Inhibit to start EDGTrip AQP HVAC

Gas Detector (Line of Sight)

AQP HVAC air inletTwo gas detectors more than 40% LEL (2ooN)

Activate ESD1Inhibit AQP fire water pump to startStart fire water pumps on APPPAGA tone 2Stop/Inhibit to start EDGTrip AQP HVACIsolate battery of AQP

All HMI in CCR will power loss

Gas Detector (Point type)

ALQB HVAC air inletTwo gas detectors more than 40% LEL (2ooN)

Activate ESD1Start fire water pumpsPAGA tone 2Trip ALQB HVACTrip ALQB UPS and essential power

Gas Detector (Point type)

Turbo machinery package has “Eagle Quantum” controller as independent F&G system

No detectors votingNo ESD1

F&G in Turbo Machinery Packages

Feed gas compressorsConfirm fire by heat detectorConfirm fire by flame detector (3s delay in “eagle

quantum” for confirmation)Shutdown FGC (with blowdown)Release CO2 for package

Release “main” CO2 then wait for 90 seconds. If fire still active, will release “reserve” CO2

Start fire water pumpsPAGA tone 2Isolate all power to package

Gas alarm at 5% LELConfirm gas at 10% LEL

Same action as above except no CO2 release

F&G in Turbo Machinery Packages

Sale gas compressorsConfirm fire by heat detectorConfirm fire by flame detector (5s delay in “flame

detector” for confirmation)Shutdown SGC (with blowdown)Release CO2 for package

Release “primary” and “extended”Start fire water pumpsPAGA tone 2Isolate all power package

Gas alarm at 20% LELConfirm gas at 40% LEL

Same action as above except no CO2 release

F&G in Turbo Machinery Packages

Power GeneratorsConfirm fire by heat detectorConfirm fire by flame detector (5s delay in “flame

detector” for confirmation)Shutdown power generator Release CO2 for package

Release “primary” and “extended”Start fire water pumpsPAGA tone 2Isolate all power package

Gas alarm at 20% LELConfirm gas at 40% LEL

Same action as above except no CO2 release

F&G in Turbo Machinery Packages

Very Early Smoke Detection Apparatus Work by continually drawing air into the pipe network. The sample

enter to laser detection chamber for smoke detection Installation

APP LER, APP SWR, APP ESWR, AQP SWRAction

When fire alert Alarm in CCR Operator have to investigate the root cause of smoke and try to stop it

When confirm fire Start fire water pumps Trip HVAC units and close fire dampers. Isolate normal and essential lighting PAGA tone2

Note: There is no ESD1 in this case.

VESDA

Manual Alarm Call pointLocated around the facility to allow personnel

to raise an alarm.Alarm in CCR only. Panel operator will take necessary action.

MAC

Located principally near main stairways on main process decks.

Action - Activate ESD1Close all shutdown valvesOpen all blowdown valvesTrip all packagesESD2 on all wellhead platformsStart Fire Water PumpsPAGA tone2Trip normal power (Main Generators)

EDG will start automatically

ESD1 Push Button

Located atHelideck Access LandingLifeboat embarkation area Drain Deck

Action – Activate ESD0ESD1ESD1 on all wellhead platformsStop EDGPAGA tone1Isolate Battery charger on AQPDelay 30 minutes to isolate UPS on AQPDelay 3 hours to isolate UPS and Battery charger on

APP

ESD0 Push Button

Located atIn front of LERIn front of ESWRIn front of CCR

This PB is use for isolate power in the room in case of fire.

Power Isolation Push Button

LER and ESWRActivate ESD1Stop/Inhibit to start EDGIsolate APP battery charger120 seconds delay to isolate APP UPS

This will lead to black-out. SIS loss power.

Power Isolation Push Button

CCRActivate ESD1Isolate AQP battery charger and UPS

All HMI in CCR will loss power

Power Isolation Push Button

Photoelectric sensing detect visible fire particles

Located in AQP Workshop, CCR, Raised floors, Laboratory, Battery room

ActionConfirm smoke in Laboratory (1oo1)

PAGA tone 2Trip HVAC units and close fire dampers. Isolate all power sources within the laboratoryStart fire water pumps

Smoke Detector

ActionConfirm smoke in APP battery room (2oo2)

PAGA tone 2Close fire dampers. Start fire water pumps

Confirm smoke in AQP battery room (1oo1)PAGA tone 2Trip AQP HVACStart fire water pumps

Smoke Detector

ActionConfirm smoke in AQP workshop (2ooN in

same fire zone)PAGA tone 2Trip AQP HVAC and close fire dampers. Isolate all power sources within fire zoneStart fire water pumps

Smoke Detector

The outer shell is made of a rapidly expanding alloy which closely follows changes in surrounding air temperature. The inner struts are made of a lower expanding alloy. Designed to resist thermal energy absorption and sealed inside the shell, the struts follow temperature changes more slowly.

Designed to activate at a fixed temperature, regardless of the rate of temperature rise.

Set point is 60 DegC.

Heat Detector (Rate Compensation)

They will be used as the primary means of fire detection in areas where smoke is regularly expected and accepted (Welding workshop, mechanical workshops, EI workshop).

ActionConfirm heat in one fire zone (1ooN)

PAGA tone 2Trip HVAC units and close fire dampers. Isolate all power sources within fire zoneStart fire water pumps

Heat Detector (Rate Compensation)

Autronica AutroSafe on ALQBAutomatic addressing of detectors. Self-Verify Function for automatic testing of

detectors The system operates on the new AUTROLON

communication bus, enabling networking of all panels, detectors and interfaces to easily form a complex, distributed and totally interactive system - giving the flexibility to adapt to the individual requirements of any site.

Addressable Fire Panel

Smoke Detector (optical type) installed in every cabins, offices, recreation area

MAC installed in around the building to allow personnel to raise an alarm

Heat Detector install in galleyVESDA installed in TERFlame detectors at HelideckAddressable interface unit installed on every

floorsAddressable control panel is in CCR

Addressable Fire Panel

ActionConfirm fire inside ALQB

Alarm in CCR with tag and location of fire.Close fire dampersTrip ALQB HVAC Start stairwell pressurize fans

Confirm gas outside ALQB (XS-8600; signal from SIS)Alarm in CCRClose fire dampersTrip ALQB HVAC NOT Start stairwell pressurize fans

Addressable Fire Panel

ActionConfirm fire inside galley

Alarm in CCR with tag and location of fire.Close fire dampersTrip ALQB HVAC Start stairwell pressurize fansTrip galley distribution board (LSB-QP-360)

All ALQB F&G detection will not alarm to PAGA

Addressable Fire Panel

Please refer to C&E for detail actions for each F&G detection

Note