Class 2 (2nd Engineer) SC&S 📅 Aug 2022

Exam Question

With reference to cargo hatch covers on large container ships:

(a) Describe how they are tested for water tightness

(b) Explain how the weight of the hatch and containers is transferred to the ship's structure whilst allowing for deflections of the hull in a seaway

(c) Describe, with the aid of a sketch, the type and location of damage that can occur due to wear of the hatch supporting arrangements.

Reference Answer

(a) Cargo hatch cover can be tested for water tightness by Hose test. In this test, a water spray from a nozzle of 12mm diameter is sprayed over the joint of hold and cover from a distance of 1m to 1.5 m with a pressure of 0.5 m/sec water jet. Any leak of water inside the cargo hold will indicate a gap between the hold and the cover.
Other methods include:
Chalk test - on top of bar that the hatch sealing rubber rests
Ultrasonic testers are available to check the seals

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