4.9 Requirements for spaces containing cargo handling systems other than cargo holds
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1363 – Interim Guidelines for the Construction and Equipment of Ships Carrying Natural Gas Hydrate Pellets (NGHP) in Bulk – (30 June 2010) - Annex – Interim Guidelines for the Construction and Equipment of Ships Carrying Natural Gas Hydrate Pellets (NGHP) in Bulk - 4 General Requirements - 4.9 Requirements for spaces containing cargo handling systems other than cargo holds

4.9 Requirements for spaces containing cargo handling systems other than cargo holds

 The following requirements should apply to spaces containing mechanical cargo handling systems other than cargo holds.

Parent topic: 4 General Requirements

4.9.1 Materials

 The materials for the structure of the spaces should be in accordance with recognized standards for the design temperature. The design temperature for the materials should be calculated for the design conditions accepted by the Administration.

4.9.2 Design pressure

 The design pressure of an enclosed space should be the maximum value of the following:

  • .1 MARVS of relevant cargo holds; or

  • .2 for an enclosed space which may be segregated from all pressure relief valves, an envisaged maximum pressure at the ambient temperature, at the discretion of the Administration, under the assumption that the total amount of NGHPs on the cargo handling system in the space dissociate and the natural gas is contained in the space.

In this context, the provision of paragraph 5.2.3.3 of the IGC Code, i.e. the requirement of design pressure for process pressure vessels and piping, need not apply to spaces containing cargo handling systems on NGHP carriers.

4.9.3 Gas-tightness of joints

 Gas-tightness of all joints between gas-tight spaces should be kept to the satisfaction of the Administration.

4.9.4 Means of closure for openings of gas-tight spaces

 Means of closure should be provided for all openings of the spaces to prevent unexpected ingress or outflow of gases or air. Each means of closure should have remote control function, at the discretion of the Administration, and be capable of being opened and shut at the position of the means of closure.

4.9.5 Testing

 The pressure test and other non-destructive tests for welded parts should be conducted, as necessary, at the discretion of the Administration.

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