5 Rule-of-thumb method
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Statutory Documents - IMO Publications and Documents - International Codes - CSS Code - Code of Safe Practice for Cargo Stowage and Securing1 – Resolution A.714(17) - Annex 13 - Methods to assess the efficiency of securing arrangements for non-standardized cargo - 5 Rule-of-thumb method

5 Rule-of-thumb method

  5.1 The total of the MSL values of the securing devices on each side of a cargo item (port as well as starboard) should equal the weight of the item.footnote

 5.2 This method, which implies a transverse acceleration of 1g (9.81 m/s2), applies to nearly any size of ship, regardless of the location of stowage, stability and loading condition, season and area of operation. The method, however, takes into account neither the adverse effects of lashing angles and non-homogeneous distribution of forces among the securing devices nor the favourable effect of friction.

 5.3 Transverse lashing angles to the deck should not be greater than 60° and it is important that adequate friction is provided by the use of suitable material. Additional lashings at angles of greater than 60° may be desirable to prevent tipping but are not to be counted in the number of lashings under the rule of thumb.

Parent topic: Annex 13 - Methods to assess the efficiency of securing arrangements for non-standardized cargo
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