MAN B&W 12.08
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MAN Diesel
198 83 46-5.0MAN B&W 70-26MC/MCC,
70-35ME/MEC/ME-B/GI engines
In order to protect the engine, some minimum
temperature restrictions have to be considered
before starting the engine and, in order to avoid
corrosive attacks on the cylinder liners during
starting.
The temperature and speed/load restrictions vary
with type of propeller as explained below.
Fixed pitch propeller plants
• Normal start of engine:
Normally, a minimum engine jacket water tem-
perature of 50 °C is recommended before the
engine may be started and run up gradually
from 80% to 90% of specified MCR speed
(SMCR rpm) during 30 minutes.
For running up between 90% and 100% of
SMCR rpm, it is recommended that the speed
be increased slowly over a period of 60 minutes.
• Start of cold engine:
In exceptional circumstances where it is not
possible to comply with the above-mentioned
recommendation, a minimum of 20 °C can be
accepted before the engine is started and run
up slowly to 80% of SMCR rpm.
Before exceeding 80% SMCR rpm, a minimum
jacket water temperature of 50 °C should be
obtained before the above described normal
start load-up procedure may be continued.
Controllable pitch propeller plants
• Normal start of engine:
Normally, a minimum engine jacket water
temperature of 50 °C is recommended before
the engine may be started and run up gradu-
ally from 50% to 75% of specified MCR load
(SMCR power) during 30 minutes.
For running up between 75% and 100% of
SMCR power, it is recommended that the load
be increased slowly over a period of 60 minutes.
• Start of cold engine:
In exceptional circumstances where it is not
possible to comply with the above-mentioned
recommendation, a minimum of 20 °C can be
accepted before the engine is started and run
up slowly to 50% of SMCR power.
Before exceeding 50% SMCR power, a mini-
mum jacket water temperature of 50 °C should
be obtained before above described normal
start load-up procedure may be continued.
Jacket water warming-up time
The time period required for increasing the jacket
water temperature from 20 °C to 50 °C will de-
pend on the amount of water in the jacket cooling
water system, and the engine load.
Note:
The above considerations for start of cold engine
are based on the assumption that the engine has
already been well runin.
Temperature at Start of Engine
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