This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
This section is available on request - MAN Diesel & Turbo
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<strong>MAN</strong> B&W 12.08<br />
Temperature at Start of Engine<br />
In order to protect the engine, some minimum<br />
temperature restricti<strong>on</strong>s have to be c<strong>on</strong>sidered<br />
before starting the engine and, in order to avoid<br />
corrosive attacks <strong>on</strong> the cylinder liners during<br />
starting.<br />
Normal start of engine<br />
Normally, a minimum engine jacket water temperature<br />
of 50 °C <str<strong>on</strong>g>is</str<strong>on</strong>g> recommended before the engine<br />
<str<strong>on</strong>g>is</str<strong>on</strong>g> started and run up gradually to 90% of specified<br />
MCR speed.<br />
For running between 90% and 00% of specified<br />
MCR speed, it <str<strong>on</strong>g>is</str<strong>on</strong>g> recommended that the load be<br />
increased slowly – i.e. over a period of 30 minutes.<br />
Start of cold engine<br />
In excepti<strong>on</strong>al circumstances where it <str<strong>on</strong>g>is</str<strong>on</strong>g> not possible<br />
to comply with the above-menti<strong>on</strong>ed recommendati<strong>on</strong>,<br />
a minimum of 20 °C can be accepted<br />
before the engine <str<strong>on</strong>g>is</str<strong>on</strong>g> started and run up slowly to<br />
90% of specified MCR speed.<br />
However, before exceeding 90% specified MCR<br />
speed, a minimum engine temperature of 50 °C<br />
should be obtained and, increased slowly – i.e.<br />
over a period of at least 30 minutes.<br />
The time period required for increasing the jacket<br />
water temperature from 20 °C to 50 °C will depend<br />
<strong>on</strong> the amount of water in the jacket cooling<br />
water system, and the engine load.<br />
Note:<br />
The above c<strong>on</strong>siderati<strong>on</strong>s are based <strong>on</strong> the assumpti<strong>on</strong><br />
that the engine has already been well<br />
run�in.<br />
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Fig. 12.08.01: Jacket water preheater<br />
Preheating of diesel engine<br />
Preheating during standstill periods<br />
Page of<br />
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178 16 63�1.0<br />
During short stays in port (i.e. less than 4�5 days),<br />
it <str<strong>on</strong>g>is</str<strong>on</strong>g> recommended that the engine <str<strong>on</strong>g>is</str<strong>on</strong>g> kept preheated,<br />
the purpose being to prevent temperature<br />
variati<strong>on</strong> in the engine structure and corresp<strong>on</strong>ding<br />
variati<strong>on</strong> in thermal expansi<strong>on</strong>s and possible<br />
leakages.<br />
The jacket cooling water outlet temperature should<br />
be kept as high as possible and should – before<br />
starting�up – be increased to at least 50 °C, either<br />
by means of cooling water from the auxiliary engines,<br />
or by means of a built�in preheater in the<br />
jacket cooling water system, or a combinati<strong>on</strong>.<br />
<strong>MAN</strong> B&W MC/MC�C, ME/ME-B/ME�C/ME�GI engines 198 39 86�0.2<br />
<strong>MAN</strong> <strong>Diesel</strong><br />
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