Aux 2 Unit 15 Bulkheads Q1 Answer

(a) Describe, with the aid of a sketch, the securing arrangement for a pipe passing through a watertight bulkhead.(5)
(b) Sketch an arrangement for a watertight electric cable gland labelling ALL components.(5)

When a pipe passes through a watertight bulkhead, it must not impair the watertight integrity of the bulkhead.
A watertight gland or collar is fitted where the pipe penetrates the bulkhead.
The pipe must be rigidly supported on both sides of the bulkhead so that no stress is transmitted to the joint.
The collar is continuously welded to the bulkhead around the pipe, or alternatively, a bolted gland with a packing arrangement may be used for removable pipes.
The space between the pipe and bulkhead collar is packed with oil- and water-resistant packing material, compressed by a gland flange and bolts, ensuring a tight seal.

Labelled components:

A watertight cable gland ensures that no water can pass along the cable through a bulkhead or deck while maintaining the integrity of the electrical insulation.
The gland is made of brass or corrosion-resistant alloy and uses compression sealing rings or packing to grip and seal the cable.
The gland body is threaded or welded into the bulkhead and is sealed with rubber or neoprene compression bushes and locknuts.
A tapered compression ring compresses the sealing bush tightly around the cable sheath, preventing water ingress.
The gland is designed to maintain both watertight and flameproof properties if required.

Labelled components: