Exam Question
(a) Explain the need for additives in engine jacket water cooling systems. (6)
(b) State what factors determine the choice of chemicals used (5)
(c) State why chromates are seldom used. (5)
Class 4 (4th Engineer)
MEKM
📅 Sep 2022
Reference Answer
### (a) The Need for Additives in Engine Jacket Water Cooling Systems (6 Marks)
The primary function of the engine jacket water system, also known as the High Temperature (HT) cooling system, is to remove excess heat from the engine's combustion space components (cylinder liners, cylinder heads, exhaust valve cages) and maintain them at their optimal operating temperature. While fresh water is the cooling medium, using it without chemical treatment would lead to severe operational problems and eventual component failure. The need for additives arises from the necessity to counteract the inherent detrimental properties of water in a high-temperature metallic environment.
Key reasons for adding chemical additives are:
1. **To Prevent Corrosion:**
The primary function of the engine jacket water system, also known as the High Temperature (HT) cooling system, is to remove excess heat from the engine's combustion space components (cylinder liners, cylinder heads, exhaust valve cages) and maintain them at their optimal operating temperature. While fresh water is the cooling medium, using it without chemical treatment would lead to severe operational problems and eventual component failure. The need for additives arises from the necessity to counteract the inherent detrimental properties of water in a high-temperature metallic environment.
Key reasons for adding chemical additives are:
1. **To Prevent Corrosion:**
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