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

Exam Question

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

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

Reference Answer

### (a) Mast Raiser
#### Definition
A mast raiser, also known as a mast riser or vent post, is a fabricated vertical steel structure on the deck of a ship. It serves as a common high-level termination point for the air and sounding pipes of several tanks, typically for fuel oil, diesel oil, lubricating oil, or ballast tanks. It consolidates multiple vent lines into a single, tall, and robust post.
#### Purpose

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