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Main and Auxiliary Machinery Overspeed Protection Devices

It is imperative that machinery safety devices are maintained in working order, and that they are tested at regular intervals according to the instructions in the maker’s manual. The shutdown systems fitted to each machine are to be tested approximately once per month where practical, and must be tested at intervals not exceeding three months.

The Engineer Officer’s carrying out the trip tests are to consult the maker’s manual to ensure that they are fully conversant with the operation of the shutdowns, in particular the over-speed device and the method of testing it. Should there be any doubt about how to test the device you must contact the relevant management office.

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The operation of protection systems must also be checked after any maintenance is carried out on the machinery which could in any way affect the operation of the shut downs or associated equipment. In such cases the engine must only be started under controlled conditions where it can be shut down immediately should a protection device such as the overspeed shutdown fail.

Testing of all machinery safety systems must be included in your vessel’s Planned Maintenance System. Regular testing and confirming the operation of all engine protection devices is to be carried out at the earliest practical opportunity. Should any problems be experienced with the devices, or should there be insufficient makers information available on board to enable test to be carried out seek shore assistance

Malfunction of Remote control and automation have been know to occur, especially in pneumatically operated systems. This can be due to insufficient maintenance or lack of overhaul being carried out on pilot or solenoid valves.

Problems are also caused by poor quality control air. This means of providing suitable air, be it molecular sieve, refrigerated filter or heatless dryer, must be maintained in first class condition. Operation of air cleaning systems must be monitored as part of watch keeper’s checks and all watchkeepers must be instructed as to the importance of maintaining such equipment in good order. They must, in addition, note any quantity of oil or water drained or exhausted from any components of control systems and the source of such contamination must also be traced.

Any failure of the air purification system which cannot be repaired immediately is to be reported to the management office at once, quoting the relevant requisition number for any spare parts required for repair.

All pneumatic valves or devices are to be included in the planned maintenance system and incorporated within checks and inspections. Function checks are normally sufficient to ensure sound operation, but all critical valves (i.e. valves which control main and auxiliary systems and whose failure could have serious impact on the vessel’s safe operation) must be opened for inspection and overhaul at least once every 3 years or earlier if so stipulated by the makers.

In order to avoid failure of control systems after inspection and overhaul, engineers charged with this work must be able to demonstrate competency and understanding of the system that they are working on and be aware of the possible consequences of the overhauled components subsequent failure.



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