Proposal for Venting Arrangements on Board Chemical Tankers
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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) - Guidelines for the Uniform Application of the Survival Requirements of the Bulk Chemical Code and the Gas Carrier Code(approved by the Maritime Safety Committee at its forty-second session, 1980) - Proposal for Venting Arrangements on Board Chemical Tankers

Proposal for Venting Arrangements on Board Chemical Tankers

 The following arrangement may be accepted as providing a level of protection equivalent to that requested by SOLAS, regulations II-2/59.1.5 and contained in the annex to MSC/Circ.373/Rev.1. The arrangement may be used on non-inerted or inerted cargo tanks with vent pipe sizes up to and including 100 mm in diameter.

  1 Piping systems referred to in chapter 8 of the IBC Code may be provided with the following:

  • .1 pressure/vacuum valves with the following characteristics:

    • constructed in accordance with the appropriate sections of MSC/Circ.373/Rev.1 excluding the type test procedures for flame arresting capabilities;
    • opening overpressure of at least 0.18 bar;

  • .2 a flame-arresting device fitted at the pipe outlet which has been tested for flashback in accordance with paragraph 3.2.2 and, where applicable, paragraph 2.5.4 of MSC/Circ.373/Rev.1;

  • .3 the vacuum side of the valve to be protected with a flamescreen as defined in MSC/Circ.373/Rev.1 or a device tested for flashback.

  2 It should be ensured that when the valve is open a minimum flow velocity of at least 10 m/sec is maintained at the outlet of the assembly above the flame-arresting device.

Parent topic: Guidelines for the Uniform Application of the Survival Requirements of the Bulk Chemical Code and the Gas Carrier Code(approved by the Maritime Safety Committee at its forty-second session, 1980)
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