Class 2 (2nd Engineer) SC&S 📅 Aug 2019

Exam Question

Discuss the need for adequate support of engine room gantry cranes, detailing the following.

(a) Sketch section through the engine room casing showing how the crane is supported by the ship structure.

(b) State what restricts the forward and aft limits of the crane and what is fitted to prevent the crane damaging the forward and aft bulkheads or casing.

Reference Answer

(a) Engine room gantry crane:
(b) Forward and aft limits of crane:
Two limit switches are installed to automatically cut off the motor power when the crane reaches its forward or aft limits.
Mechanical Stoppers are fitted at the forward and aft ends of the crane rails. They act as a failsafe to prevent the crane from damaging the forward and aft bulkheads or casing if the limit switches fail. Rubber or spring buffers may also be added to absorb impact forces and reduce the risk of damage.

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