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MAN B&W 7.05
Fuel Oil Heater
The heater <strong>is</strong> to be of the tube or plate heat exchanger
type.
The required heating temperature for different oil
v<strong>is</strong>cosities will appear from the ‘Fuel oil heating
chart’, Fig. 7.05.01. The chart <strong>is</strong> based on information
from oil suppliers regarding typical marine
fuels with v<strong>is</strong>cosity index 70�80.
Since the v<strong>is</strong>cosity after the heater <strong>is</strong> the controlled
parameter, the heating temperature may vary,
depending on the v<strong>is</strong>cosity and v<strong>is</strong>cosity index of
the fuel.
Recommended v<strong>is</strong>cosity meter setting <strong>is</strong> 10�15 cSt.
Temperature
after heater
Fig. 7.05.01: Fuel oil heating chart
C
170
160
150
140
130
120
110
100
90
80
70
60
50
40
Normal heating limit
Approximate pumping limit
Page 2 of 3
Fuel oil v<strong>is</strong>cosity specified ... up to 700 cSt at 50°C
Fuel oil flow .................................... see capacity of
fuel oil circulating pump
Heat d<strong>is</strong>sipation ................. see ‘L<strong>is</strong>t 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 v<strong>is</strong>cosity 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 v<strong>is</strong>cosity
after heater
30
10 15 25 35 45 55 cST/100˚C
30 60 100 180 380 600 cST/50˚C
200 400 800 1500 3500 6000 sec.Rw/100˚ F
MAN B&W MC/MC-C, ME/ME�C/ME�GI/ME-B engines 198 39 51�2.6
MAN Diesel
cSt.
7
10
12
15
20
30
sec.
Rw.
43
52
59
69
87
125
178 06 28�0.1