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Class 2 (2nd Engineer) MEP 📅 Jan 2024

Exam Question

What typical effects might continuous running at service speed in heavy weather have on marine machinery? Suggest the specific attention one has to pay and the maintenance checks that have to be carried out on the following after continued operation under heavy weather conditions:

(a) intermediate shafting (3)

(b) tail shafting (3)

(c) shafting coupling bolts (4)

(d) engine supports (3)

(e) thrust pads (3)

Reference Answer

Effects of Continuous Running at Service Speed in Heavy Weather
When a ship operates continuously in heavy weather, the propeller experiences irregular immersion, racing, and vibration due to pitching, rolling, and slamming . These fluctuating forces are transmitted through the propeller shaft, intermediate shaft, and main engine , resulting in:
Fluctuating torsional and bending stresses
Overheating and fatigue of rotating machinery

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