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

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 50t should be placed so as to keep the aft draft constant. (10)

Reference Answer

### Part (a): Mast Riser
**(6 Marks)**
**1. Definition:**
A 'mast riser' is a large-diameter vertical pipe, typically attached to a ship's mast, which serves as a common high-level vent outlet for the vapour lines from multiple cargo tanks on a tanker (oil, chemical, or gas carrier). It terminates at a significant height above the deck, ensuring that vented gases are dispersed safely into the atmosphere.

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