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

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. (6)

(b) Explain how water-tightness of the door and frame mating surface is ensured with a hydrostatic pressure tending to force the faces apart. (5)

(с) Describe the means of remote closing operation of the door. State how many closing stations are there and indicate their position. (5)

Reference Answer

### (a) Watertight Door, Frame, and Bulkhead Reinforcement
A watertight door assembly is designed to maintain the integrity of a watertight bulkhead when closed. The aperture for the door is a significant structural discontinuity, requiring substantial reinforcement to restore the bulkhead's strength and stiffness.
**1. Construction & Attachment:**
* **Door:** The door itself is constructed from steel plate, equivalent in strength to the surrounding bulkhead. It is fitted with stiffeners to prevent deflection under hydrostatic load.

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