Interpretation Monitoring of overpressure in spaces protected by air-locks (Paragraphs 3.6.3 and 3.6.4)
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.406/Rev.1 – Guidelines on Interpretation of the IBC Code and the IGC Code and Guidelines for the Uniform Application of the Survival Requirements of the IBC and IGC Codes – (Adopted on 29 June 1990) - Annex - Guidelines on Interpretation of the IBC Code and the IGC Code and Guidelines for the Uniform Application of the Survival Requirements of the IBC and IGC Codes - Interpretation of Provisions in the IGC Code - InterpretationMonitoring of overpressure in spaces protected by air-locks (Paragraphs 3.6.3 and 3.6.4)

Interpretation Monitoring of overpressure in spaces protected by air-locks (Paragraphs 3.6.3 and 3.6.4)

 The following means are considered acceptable alternatives to differential pressure sensing devices in spaces having a ventilation rate not less than 30 air changes per hour:

  • .1 monitoring of current or power in the electrical supply to the ventilation motors; or

  • .2 air flow sensors in the ventilation ducts.

 In spaces where the ventilation rate is less than 30 air changes per hour and where one of the above alternatives is fitted, in addition to the alarms required by paragraph 3.6.3, the arrangements should be made to de-energize electrical equipment which is not of the certified safe type, if more than one air lock door is moved from the closed position.

Parent topic: Interpretation of Provisions in the IGC Code
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