Class 4 (4th Engineer) SC&S 📅 Aug 2022

Exam Question

(a) Sketch a water-tight door and frame showing manner of attachment to bulkhead and the additional reinforcement carried by the bulkhead to compensate for the aperture (8)

(b) Explain how water-tightnes of the door and frame mating surface is ensured with an hydrostatic pressure tending to force the faces apart (8)

Reference Answer

### (a) Watertight Door, Frame, and Bulkhead Reinforcement
A watertight door assembly is a critical safety feature designed to maintain the integrity of a vessel's watertight subdivision. Its construction and installation must compensate for the structural weakness introduced by cutting an aperture in a watertight bulkhead.
**1. Watertight Door Panel & Frame:**
* **Door Panel:** The door itself is constructed from steel plate, with a thickness equivalent to or greater than the bulkhead plating it is fitted to. It is stiffened by welded steel sections (angles or flat bars) to prevent deflection under hydrostatic load.

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