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The functions of an LP booster pump in a gas turbine fuel system are to…

  • A

    pressurise the fuel dump system and increase the pressure during refuelling.

  • B

    avoid vapour locking and increase the pressure during refuelling.

  • C

    increase the pressure during refuelling and prevent cavitation of the HP fuel pump.

  • D

    avoid vapour locking and prevent cavitation of the HP fuel pump.

Refer to figure.
CENTRIFUGAL PUMPS
Centrifugal pumps are the most common type of auxiliary/booster fuel pumps used on aircraft, especially in large and high-performance aircraft, used to increase the fuel pressure in the pipe. A centrifugal boost pump is a low pressure and electric motor driven variable displacement pump. Most frequently, this type of pumps are submerged in the fuel tank thereby enabling pump priming and preventing cavitation. Another reason for submerging the pumps is to cool them during operation.

Cavitation and vapour lock are slightly different. but mostly occur due to low pressure in a line. the LP pump helps to prevent this by pressurising the fuel lines to the HP pump.

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