Class 4 (4th Engineer) MEP 📅 Nov 2024

Exam Question

A centrifugal pump has been opened up due to abnormal noise:

(a) List the cheeks you will carry out on various parts; (4)

(b) Name the parts which may require replacement; (4)

(d) Operational parameters, which may be required to be compared with manufacturers test record. (4)

Reference Answer

### (a) Checks on Various Parts after Opening Up
Upon opening a centrifugal pump due to abnormal noise, a systematic and thorough inspection of all internal components is critical. The following checks must be performed:
1. **Impeller Inspection:**
* **Cavitation & Erosion:** Visually inspect the impeller vanes (both pressure and suction sides) and shrouds for pitting, which indicates cavitation damage. Check for general erosion or corrosion thinning the vane material.

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