Exam Question
(a) Sketch and describe a central cooling fresh system for a motor ship. (8)
(b) State the possible causes of corrosion in the closed system described in (a). (4)
(c) Explain how protections against corrosion is provided? (4)
Class 4 (4th Engineer)
MEKG
📅 Apr 2025
Reference Answer
### (a) Central Cooling Fresh Water System
#### Concept and Purpose
A central cooling fresh water (FW) system is the standard method for cooling machinery on a modern motor ship. Its primary purpose is to limit the use of corrosive seawater to a single, easily maintainable circuit. A large central heat exchanger uses seawater to cool a closed-loop fresh water system, which is then circulated to all the ship's heat-producing machinery. This approach protects engines and auxiliary equipment from the corrosion, erosion, and scaling issues associated with direct seawater cooling.
The system is typically divided into two sub-circuits:
#### Concept and Purpose
A central cooling fresh water (FW) system is the standard method for cooling machinery on a modern motor ship. Its primary purpose is to limit the use of corrosive seawater to a single, easily maintainable circuit. A large central heat exchanger uses seawater to cool a closed-loop fresh water system, which is then circulated to all the ship's heat-producing machinery. This approach protects engines and auxiliary equipment from the corrosion, erosion, and scaling issues associated with direct seawater cooling.
The system is typically divided into two sub-circuits:
Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.
Prepare on Android — MeoMock on Google Play