Class 4 (4th Engineer) SC&S 📅 Feb 2025

Exam Question

(a) What is a 'mast riser' and what is the purpose of it? (6)

(b) A ship 96 m long is floating at 5m fwd draft and 6.4 m aft draft, MCTC 180 tm, TPC 16. COF is 2 m abaft of midships. Find the location where a weight of 50 t should be placed so as to keep the aft draft constant. (10)

Reference Answer

### Part (a): Mast Riser
A 'mast riser' is a critical component of a tanker's cargo tank venting system or inert gas system. It is a vertical pipe, typically of large diameter, that extends to a significant height, often up a vessel's mast or a dedicated post.
**Purpose and Function:**
The primary purpose of the mast riser is to ensure the safe and controlled ventilation of cargo tanks to the atmosphere, in compliance with international regulations (SOLAS, MARPOL).

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