Class 4 (4th Engineer) MEP 📅 Sep 2022

Exam Question

Reduction in vacuum in the suction lines of bilge pump system due to ingress of air, has been experienced

(a) List the causes leading to this problem. (8)

(b) What temporary repairs are to be carried out if a pipe is found to be corroded in one location. (8)

Reference Answer

### (a) Causes for Reduction in Vacuum in Bilge Pump Suction Lines
A reduction in vacuum in the suction line of a bilge pump, primarily due to air ingress, indicates a loss of airtight integrity between the suction bell mouth and the pump impeller. The primary causes can be categorized into system integrity failures, pump-specific failures, and operational issues.
**1. Suction Line and Fitting Integrity Failures:**
* **Leaking Pipe Joints:** The most common cause. Gaskets at flanged joints can perish, degrade due to oil, or become brittle with age. Loosening of flange bolts due to vibration can also create a path for air ingress.

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