Class 4 (4th Engineer) MEKG 📅 Jan 2023

Exam Question

(a) Sketch and explain the parts of a shell and tube type lubricating oil cooler showing the oil and water flow paths and material of each part. (8)

(b) Explain how the expansion and contraction of the tubes stack of the cooler is accommodated (8)

Reference Answer

### **Part (a): Shell and Tube Lubricating Oil Cooler: Construction, Flow Paths, and Materials**
A shell and tube type heat exchanger is predominantly used for lubricating oil cooling on board ships. Its function is to transfer heat from the hot lubricating oil, returning from the engine, to a cooler medium, typically the LT (Low Temperature) Central Cooling Water, thereby maintaining the oil viscosity within the manufacturer's specified range.
#### **1. Construction and Component Materials**
The cooler consists of the following primary components:

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