MAN B&W L28/32H, Manual

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08028-0D\H5250\94.08.12
General
The built-on cooling water preheating arrangement
consist of a thermostat-controlled el-preheating ele-
ment built into the outlet pipe for the HT cooling water
on the engine's front end. The pipe dimension has
been increased in the piping section where the
heating element is mounted.
Preheater
3x380V/3x440V
kW
12.0
12.0
15.0
15.0
15.0
Cyl. No.
5
6
7
8
9
1613487-1.4
Page 1 (1)
Preheater Arrangement in High Temperature System B 13 23 1
L28/32H
99.48
The system is based on thermosiphon cooling and
reverse water direction, i.e. from top and downward,
and an optimal heat distribution in the engine is thus
reached.
When the engine is in standstill, an extern valve must
shut-off the cooling water inlet.
Operation
Engines starting on HFO and engines in stand-by
position must be preheated. It is therefore recom-
mended that the preheater is arranged for automatic
operation, so that the preheater is disconnected
when the engine is running and connected when the
engine is in stand-by position. The thermostat set-
point is adjusted to 70° C, that gives a temperature
of app. 50° C at the top cover. See also E 19 13 0,
High Temperature Preheater Control Box.