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


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