BOG Flashcards
Three (3) identical centrifugal BOG compressors trains are equipped with what other equipment?
o Dedicated suction knock out drum
o Aftercooler (2nd stage)
o Temperature desuperheater
What Gas vapors are the K-11001A/B/C Boil-Off Gas (BOG) Compressors used to compress?
o Flash gas
o Heat leak input in Piping System
o Volume displaced vapor)
o Ship Vapor Return during ship loading
What is the discharge PSV high alarm for BOG compressor set at?
o 475 psig
Where are PSVs associated with the BOG compressors gas routed?
o LP Flare
Where can the gas leaving the BOG compressor be routed to?
o BOG Compressors as anti-surge gas.
o HP Fuel Gas Header
o LTS Methane Make up
What is the High-high liquid level (shut down) in V-11001-A/B/C (suction drum) tied to SIS-1110A/B/C is set at?
o 83%
What is the purpose of LNG liquid quench?
o To lower the temperature of the BOG in the knockout drum.
If the LNG quench liquid flows to the bottom of the BOG Compressor Suction Knockout Drum what action is taken?
Warm BOG gas is injected to vaporize the liquid
How are the centrifugal BOG Compressors K-11001A/B/C two-stages identified?
o Low pressure and High-pressure side.
During holding mode how many BOG compressors are in operation?
o 2 compressors
During loading mode, due to increased vapor load on the BOG header how many compressors are in operation?
o 3 compressors
What will happen in the event of the shutdown of BOG Compressor A/B/C ?
o back pressure
o Flaring of the BOG
Once the Compressor is running and loaded, Compressor discharge gas (taken from the HP Compressor 6th stage) will be selected to supply?
Seal Gas
What is used as the external secondary seal gas?
o Nitrogen
What is the purpose of the lube oil filter?
o To filter the lube oil of any debris to avoid damage
