Motor diesel - cooling

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Background
Correct cooling water treatment and follow-up of the cooling water condition are of utmost importance for keeping the cooling water systems of the engines in good condition. The corrosion processes that could occur due to a bad cooling water quality may under certain circumstances be local and by their nature proceed very rapidly. This may cause unexpected operating problems or engine failures even within relatively short periods of time, for example in the cylinder head exhaust valve seat pockets and other areas prone to corrosion (see further comments in the “Worth noticing” chapter below) in the cooling water systems of the engines.

Most of the cooling water additives which are approved by Wärtsilä are nitrite
(typically NaNO2) based and today the majority of the installations in operation are also using nitrite based additives. There is a slow trend towards more environmentally friendly alternatives. These operating instructions and recommendations are mainly intended for installations using nitrite based additives but certainly contain useful information for users of other types of additives. Purpose
To avoid unnecessary corrosion damages and operating problems in the cooling water systems of the engines.

Instructions & Recommendations

Raw water quality

The raw water quality for the cooling water circuits of an engine must meet the following specification:

Property Limit pH Minimum 6.5
Total hardness Maximum 10 °dH*)
Chlorides (Cl) Maximum 80 mg/l
Sulphates (SO4) Maximum 150 mg/l

*) A total hardness of 10 °dH (German degrees) . 178 mg/l (as CaCO3).

Soft waters (like distilled, ion exchanged, reverse osmosis and rain water) with a total hardness close to 0 °dH have the ability to dissolve oxygen and carbon dioxide from the air, which quite rapidly lowers the pH levels and increases the corrosive effect of these waters.
Suitable amounts of calcium and magnesium

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