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Class 4 (4th Engineer) MEKG 📅 Jun 2025

Exam Question

Explain any four of the following

(a) Difference between crude oil washing and tank cleaning. (4) 

(b) Dynamic positioning system and its types (4) 

(c) Deaeration tank in the HT Jacket Cooling Water System (4) 

(d) Thermostatic expansion valve (4) 

(e) Proportional controller with examples (4) 

Reference Answer

### (a) Difference between Crude Oil Washing (COW) and Tank Cleaning
**Crude Oil Washing (COW)**
* **Purpose:** Crude Oil Washing is a method of cleaning cargo tanks on crude oil tankers using the crude oil cargo itself. The primary objectives are to:
* Maximize cargo outturn by minimizing cargo residues ("clingage" and sludge) left in tanks after discharge.

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