Figure 6.9
Fuel transfer and separating system (3V76F6626d)
Separator feed pumps (1P02)
Feed pumps should be dimensioned for the actual fuel quality and recommended throughput of the separ-
ator. The pump should be protected by a suction strainer (mesh size about 0.5 mm)
An approved system for control of the fuel feed rate to the separator is required.
MDF
HFO
Design data:
0.5 MPa (5 bar)
0.5 MPa (5 bar)
Design pressure
50°C
100°C
Design temperature
100 cSt
1000 cSt
Viscosity for dimensioning electric motor
Separator pre-heater (1E01)
The pre-heater is dimensioned according to the feed pump capacity and a given settling tank temperature.
The surface temperature in the heater must not be too high in order to avoid cracking of the fuel. The tem-
perature control must be able to maintain the fuel temperature within ± 2°C.
Recommended fuel temperature after the heater depends on the viscosity, but it is typically 98°C for HFO
and 20...40°C for MDF. The optimum operating temperature is defined by the sperarator manufacturer.
The required minimum capacity of the heater is:
Product Guide Wärtsilä 34DF - 3/2012
55
Product Guide
6. Fuel System
