Air pipe closing devices ( Regulation 20 ) (IACS interpretation LL.49)
Clasification Society 2023 - Version 9.38
Statutory Documents - IMO Publications and Documents - International Conventions - Load Lines, 1966/1988 - International Convention on Load Lines, 1966, as Amended by the Protocol of 1988 - Unified Interpretations of the Provisions of the International Convention on Load Lines, 1966 - Air pipe closing devices (Regulation 20) (IACS interpretation LL.49)

Air pipe closing devices ( Regulation 20 ) (IACS interpretation LL.49)

 This interpretation is not intended to be applied to existing ships.

 The means of closing air pipes should be weathertight and of an automatic type if the openings of the air pipes to which the devices are fitted would be submerged at an angle of less than 40 (or any lesser angle which may be needed to suit stability requirements) when the ship is floating at its summer load line draught. Pressure vacuum valves (P.V. valves) may be accepted on tankers.

 Wooden plugs and trailing canvas hoses should not be accepted as closing devices for air pipes in positions 1 and 2.


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