Class 4 (4th Engineer) SC&S 📅 May 2023

Exam Question

Define the main purpose of the following with respect to tank and pumping system. (4)

(a) Weighted cocks on tank sounding pipes, (4)

(b) Remote operated gear for bilge valves (4)

(d) Explain why gauze is sometimes titted to tank ventilation pipes and explain the effect of mesh size. (4)

Reference Answer

### (a) Weighted Cocks on Tank Sounding Pipes
**Main Purpose:**
The primary purpose of weighted, self-closing cocks on sounding pipes, particularly for fuel and lubricating oil tanks within machinery spaces, is **fire prevention and safety**. They are a critical engineering control designed to mitigate the risk of tank overflows and subsequent fires.
**Operating Principle and Design:**

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