Sheer credit for superimposed superstructures ( Regulation 38(5), 38(7) and 38(12) ) (IACS interpretation LL.29/Rev.1)
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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 - Sheer credit for superimposed superstructures (Regulation 38(5), 38(7) and 38(12)) (IACS interpretation LL.29/Rev.1)

Sheer credit for superimposed superstructures ( Regulation 38(5), 38(7) and 38(12) ) (IACS interpretation LL.29/Rev.1)

  Superstructures superimposed on a complete superstructure (Regulation 38(5))

 In applying regulation 38(5) (sheer on complete superstructure ship), where there is an enclosed poop or forecastle superimposed on a complete superstructure, sheer credit should be allowed for such poop or forecastle according to the method of regulation 38(12) as shown in figure 7.

Figure 7

  Superstructures superimposed on a forecastle or poop (i.e. a stepped forecastle or poop) (Regulation 38(7))

 In applying regulation 38(7) and 38(12) where a poop or forecastle consists of two layers, the method shown in figure 8 should be used.

Figure 8

 In the above the following definitions should apply:

  Z is as defined in regulation 38(5)

  Z v is the end ordinate of a virtual standard parabolic curve taken through the point “x”. If Z v is greater than (Z + h), the end ordinate should be (Z + h), in which case point “x” should be disregarded and curve 2 not taken into account.

 When the length of the first tier superstructure is greater than 0.5L, the virtual standard parabolic curve should commence at amidships as indicated in figure 7.

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