Man B&W S50ME-B9.3-TII, Project Manual

Page: 166 / 337

MAN B&W 7.05
Page 2 of 3
MAN Diesel
MAN B&W MC/MC-C, ME/MEC/ME-B/GI engines 198 39 512.8
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
Fuel oil viscosity specified ... up to 700 cSt at 50°C
Fuel oil flow .................................... see capacity of
fuel oil circulating pump
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.
Temperature
after heater
C
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
Normal heating limit
Approximate pumping limit
10 15 25 35 45 55
cST/100˚C
200 400 800 1500 3500 6000 sec.Rw/100˚ F
30 100 180 380 600 cST/50˚C
Approximate viscosity
after heater
cSt.
sec.
Rw.
7
10
12
15
20
30
43
52
59
69
87
125
60
178 06 280.1
Fuel Oil Heater