Fuel Oil Heater; Fuel Oil Heating Chart - Man B&W S50MC-C8-TII Project Manual

MAN B&W

Fuel Oil Heater

The heater is to be of the tube or plate heat ex-
changer type.
The required heating temperature for different oil
viscosities will appear from the 'Fuel oil heating
chart', Fig. 7.05.01. The chart is based on informa-
tion from oil suppliers regarding typical marine
fuels with viscosity index 7080.
Since the viscosity after the heater is the control-
led parameter, the heating temperature may vary,
depending on the viscosity and viscosity index of
the fuel.
Recommended viscosity meter setting is 1015 cSt.
Fig. 7.05.01: Fuel oil heating chart
MAN B&W MC/MC-C, ME/MEC/MEGI/ME-B engines
Temperature
after heater
C
170
Normal heating limit
160
150
140
130
120
110
100
90
80
70
60
Approximate pumping limit
50
40
30
10 15
30 60 100
200 400 800
Fuel oil viscosity specified ... up to 700 cSt at 50°C
Fuel oil flow .................................... see capacity of
Heat dissipation ................. see 'List of Capacities'
Pressure drop on fuel oil side ........maximum 1 bar
Working pressure .......................................... 10 bar
Fuel oil inlet temperature .................approx. 100 °C
Fuel oil outlet temperature ........................... 150 °C
Steam supply, saturated ..........................7 bar abs
To maintain a correct and constant viscosity of
the fuel oil at the inlet to the main engine, the
steam supply shall be automatically controlled,
usually based on a pneumatic or an electrically
controlled system.
Approximate viscosity
25 35 45 55
180 380 600
1500 3500 6000
MAN Diesel
fuel oil circulating pump
after heater
sec.
cSt.
Rw.
7 43
10 52
12 59
15 69
20 87
30 125
cST/100˚C
cST/50˚C
sec.Rw/100˚ F
7.05
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