HIGH LEVEL ALARM & OVER FILL DETECTION SYSTEMS

Certain cargoes require the designated tank to be fitted with a separate high level alarm to give warning before the tank becomes full. The alarm may be activated by either a float operating a switch device, a capacitive pressure transmitter, or an ultrasonic or radioactive source. The activation point is usually pre-set at 95% of tank capacity.

The high level alarm must be independent of the normal gauging system. High level alarms must be maintained according to maker's instructions and tested as required before cargo operations begin.

A better name for this would be a tank overflow prevention system. It is required for particular cargoes designated in the IBC Code. The system should come into operation when the normal operational procedures fail to stop the tank liquid level exceeding the normal full condition. The activation point is usually set at 98% of tank capacity.

Operation of the system is required to be independent of the high level alarm described above. On activation, the system should give a visual and audible alarm, and a signal in sufficient time to permit sequential shutdown of onshore pumps and/or valves, and the ship's valves. The shutdown can be dependent or independent of the intervention of operators.

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