9. Cooling Water System
9.1 Water quality
The fresh water in the cooling water system of the engine must fulfil the following requirements:
min. 6.5pH ...............................
max. 10 °dHHardness ....................
max. 80 mg/lChlorides ....................
max. 150 mg/lSulphates ....................
Good quality tap water can be used, but shore water is not always suitable. It is recommended to use water
produced by an onboard evaporator. Fresh water produced by reverse osmosis plants often has higher
chloride content than permitted. Rain water is unsuitable as cooling water due to the high content of oxygen
and carbon dioxide.
Only treated fresh water containing approved corrosion inhibitors may be circulated through the engines.
It is important that water of acceptable quality and approved corrosion inhibitors are used directly when
the system is filled after completed installation.
9.1.1 Corrosion inhibitors
The use of an approved cooling water additive is mandatory. An updated list of approved products is supplied
for every installation and it can also be found in the Instruction manual of the engine, together with dosage
and further instructions.
9.1.2 Glycol
Use of glycol in the cooling water is not recommended unless it is absolutely necessary. Glycol raises the
charge air temperature, which may require de-rating of the engine depending on gas properties and glycol
content. Max. 50% glycol is permitted.
Corrosion inhibitors shall be used regardless of glycol in the cooling water.
Product Guide Wärtsilä 34DF - 3/2012 85
Product Guide
9. Cooling Water System
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