3.2 Alarm conditions
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1370 – Guidelines for the Design, Construction and Testing of Fixed Hydrocarbon Gas Detection Systems – (22 June 2010) - Annex – Guidelines for the Design, Construction and Testing of Fixed Hydrocarbon Gas Detection Systems - 3 System Control Requirements - 3.2 Alarm conditions

3.2 Alarm conditions

  3.2.1 Audible and visual alarms in accordance with the Code on Alerts and Indicators should be initiated on the navigation bridge, at the control panel, and at all indicating units under the following conditions:

  • .1 upon detection of gas concentrations above the alarm setpoint in any monitored space;

  • .2 in a fault condition, such as power failure or short-circuit;

  • .3 low or no flow in any sampling pipe;

  • .4 tampering with the alarm setpoint; or

  • .5 failure of any self-test functions described in paragraph 4.1.4.

  3.2.2 A visual alarm should remain in effect while an alarm condition is present. The audible alarm may be silenced manually.

  3.2.3 The gas concentration inside the control panel enclosure should be monitored. Upon detection of gas concentrations above the alarm setpoint within the enclosure, in addition to the alarm, the gas analysis unit should be automatically isolated from all sampling pipes and shut down. Appropriate measures should be taken to vent flammable gas inside the enclosure to an open space away from ignition sources.

Parent topic: 3 System Control Requirements
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