LNG handling |||
LPG handling||| Other Gas products|||
Fire & Safety|||
Emergency response |||
Boil-off & vaporized gas (BVG) management system for carrying LNG cargo
Marine Steam Turbine Engine
The BVG management system is a total gas flow control from cargo tanks to main boilers. The total gas flow consists of the following two kind of gas.
i) Natural boil-off gas (Natural BOG) from cargo tanks.
ii) Forcing boil-off gas (Forcing BOG) generated by forcing vaporizer.
The natural BOG is sent to the main boilers by low duty compressor (L/D compressor) through the low duty heater and the flow rate is controlled by L/D compressor speed & inlet guide vane (IGV). If natural BOG does not meet boiler demand, the forcing vaporizer will generate forcing BOG and add it to natural BOG for full speed range of ship.
DFDE Engine (TANGGUH SHIPS)
i) Natural boil-off gas (Natural BOG) Burning:
During all periods that the vessel is in service and is “gassed-up”, the boil-off from the tanks will be burnt as fuel in the ship’s main generating plant or disposed of in the gas combustion unit (GCU). This gas burning operation is started on the deck but controlled by the ship’s engineers from the ECR.
Under normal operating conditions when the vessel is at sea, one L/D compressor, and one fuel gas pump for the spray coolers, will be running to supply fuel gas to the main generator engine to ensure that a stable gas supply to the diesel generators is achieved.