Exam Question
With reference to hydraulic steering gears, sketch and describe each of the following:
(a) Single failure concept
(b) 100 percent redundancy
Class 2 (2nd Engineer)
MEKG
📅 Jan 2021
Reference Answer
(a) Single failure concept: As per SOLAS Chapter 2-1, regulation 29.6:
The main steering gear is arranged so that after a single failure in its piping system or one of the power units, the defect can be isolated so that steering capability can be maintained or speedily regained.
It refers to the operation of the steering gear even in the event of failure of one power actuating system with either 100% power or 50% power. i.e., a single failure concept can be either a 100% redundant system or a 50% redundant system.
(b) 100% redundancy:
The main steering gear is arranged so that after a single failure in its piping system or one of the power units, the defect can be isolated so that steering capability can be maintained or speedily regained.
It refers to the operation of the steering gear even in the event of failure of one power actuating system with either 100% power or 50% power. i.e., a single failure concept can be either a 100% redundant system or a 50% redundant system.
(b) 100% redundancy:
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