Class 4 (4th Engineer) SC&S 📅 Apr 2024

Exam Question

Define the main purpose of the following tank and pumping system in detail:

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

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

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

Reference Answer

### (a) Weighted Cocks on Tank Sounding Pipes (4 Marks)
**1. Main Purpose & Principle:**
The primary purpose of a weighted cock on a tank sounding pipe is to act as a fail-safe, self-closing device. As per regulatory requirements (SOLAS), this is crucial to prevent accidental spillage of tank contents (e.g., fuel, oil) into a machinery space or other compartment, and to prevent progressive flooding. In the event of tank bottom damage or a breach of the sounding pipe itself below the waterline, an open cock would create a direct path for flooding, jeopardizing the vessel's stability and safety.
**2. Construction & Operation:**

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