Treatment of superstructures with sloping end bulkheads ( Regulations 34, 35 and 38(12) ) (IACS interpretation LL.37/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 - Treatment of superstructures with sloping end bulkheads (Regulations 34, 35 and 38(12)) (IACS interpretation LL.37/Rev.1)

Treatment of superstructures with sloping end bulkheads ( Regulations 34, 35 and 38(12) ) (IACS interpretation LL.37/Rev.1)

 When taking account of superstructures which have sloping end bulkheads, in the calculations of freeboards, such superstructures should be dealt with in the following manner:

  Length of Superstructure (Regulation 34)

  1 When the height of the superstructure, clear of the slope, is equal to or smaller than the standard height, the length (S) should be obtained as shown in figure 4.

Figure 4 Height of superstructure equal to or smaller than the standard height (h)

  2 When the height is greater than the standard, the length (S) should be obtained as shown in figure 5.

Figure 5 Height of superstructure greater than the standard height

  3 The foregoing should apply only when the slope, related to the base line, is 15, the configuration should be treated as sheer.

  Effective length of superstructure (Regulation 35)

 When the height of the superstructure, clear of the slope is less than the standard height, its effective length (E) should be its length (S), as obtained from paragraph 1 above, reduced in the ratio of its actual height to the standard height.

  Sheer (Regulation 38(12))

 When a poop or forecastle has sloping end bulkheads, and sheer credit may be allowed on account of excess height, the formula given in regulation 38(12) should be used, the values for y and L' being as shown in figure 6.

Figure 6 Sheer credit (s) for excess height


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