WÄRTSILÄ VASA 6L32, Instruction Manual

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19.1.6 Monitoring
The temperatures mentioned in chapter 01., section 01.2, should
not be exceeded.
Pressure gauges on the instrument panel indicate HT and LT
pressures after the pumps. The pressures depend on the speed
and the installation. Guidance values, see chapter 01., section
01.2.
The HT water outlet after the engine is provided with an alarm
switch and depending on installation with a stop switch. Main
engines are provided with alarm switches for low HT and LT
pressure.
For further information, see chapter 23.
19.2 Maintenance
19.2.1 General
The installation — including expansion, venting, preheating,
pressurizing — should be carried out strictly according to the
instructions of the engine manufacturer to obtain correct and
trouble free service.
The cooling water should be treated according to the recommen-
dations in chapter 02., section 02.3, to prevent corrosion and
deposits.
If risk of frost occurs, drain all cooling water spaces. Avoid
changing the cooling water. Save the discharged water and use it
again.
Remember to close the drain and open the cooling water connec-
tions before the engine is started again.
19.2.2 Cleaning
In completely closed systems the fouling will be minimal if the
cooling water is treated according to the instructions in chapter
02., section 02.3. Depending on the cooling water quality and the
efficiency of the treatment, the cooling water spaces will foul more
or less over the course of time. Deposits on cylinder liner water
jackets, cylinder heads and cooler stacks should be removed as
they may disturb the heat transfer to the cooling water and thus
cause serious damage.
The need of cleaning should be examined, especially during the first
year of operation. This may be done by overhauling a cylinder liner
and checking for fouling and deposits on the water jacket and block.
The deposits can be of the most various structures and consis-
tencies. In principle, they can be removed mechanically and/or
chemically as described below. More detailed instructions for
cleaning of coolers are stated in chapter 18., section 18.5.
32-200050 Cooling Water System 19
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