Calculation of HFO Booster Pump

 FO Booster pump unit

GENERAL

Booster pumps are used to pump the oil through heaters and a viscosity regulator to the engine-driven fuel pumps. The fuel pumps will discharge high-pressure fuel to their respective injectors.

To cool the engine mounted high pressure injection pumps, the capacity of the booster pump has to be at least 300 % of maximum fuel oil consumption at injection viscosity.

F.O System Diagram

Required delivery capacity of  HFO at 145° C as shown at below formula :

QP2 = P1 x br ISO x f5

Where :
QP2 (l/h) = Required booster pump delivery capacity with HFO at 145° C

P1 (Kw)  = Engine output at 100 % MCR
brISO (g/kWh) = Specific engine fuel consumption (ISO) at 100 % MCR
f5 ( l/g) = 3.9 x 10^-3
Factor for pump dimensioning
▪ For diesel engines operating on main fuel HFO
Note!
The factor f5 includes the following parameters:
▪ 300 % fuel flow at 100 % MCR
▪ Main fuel: HFO 380 mm2/50 °C 
▪ Attached lube oil and cooling water pumps
▪ Tropical conditions
▪ Realistic lower heating value
▪ Specific fuel weight at pumping temperature
▪ Tolerance

In case more than one engine is connected to the same fuel system, the pump capacity has to be increased accordingly.


Hopefully helpfully 😊
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