Cargo manifold gutter bars - freeing arrangements and intact stability ( Regulation 24 and Regulation 26 ) (IACS interpretation LL.59)
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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 - Cargo manifold gutter bars - freeing arrangements and intact stability (Regulation 24 and Regulation 26) (IACS interpretation LL.59)

Cargo manifold gutter bars - freeing arrangements and intact stability ( Regulation 24 and Regulation 26 ) (IACS interpretation LL.59)

 Where gutter bars are installed on the weather decks of tankers in way of cargo manifolds and are extended aft as far as the after house front for the purpose of containing cargo spills on deck during loading and discharge operations, the free surface effects caused by containment of a cargo spill during liquid transfer operations or of boarding seas while underway require consideration with respect to the ship's available margin of positive initial stability (GMo).

 Where the gutter bars installed are greater than 300 mm in height, they should be treated as bulwarks according to the Load Line Convention with freeing ports arranged in accordance with regulation 24 and effective closures provided for use during loading and discharge operations. Attached closures should be arranged in such a way that jamming cannot occur while at sea, ensuring that the freeing ports will remain fully effective.

 On ships without deck camber, or where the height of the installed gutter bars exceeds the camber, and for tankers having cargo tanks exceeding 60% of the ship's maximum beam at midships regardless of gutter bar height, gutter bars should not be accepted without an assessment of the initial stability (GMo) for compliance with the relevant intact stability requirement taking into account the free surface effect caused by liquids contained by the gutter bars.

Parent topic: Unified Interpretations of the Provisions of the International Convention on Load Lines, 1966
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