Regulation 37 - Deduction for Superstructures and Trunks
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Conventions - Load Lines, 1966 - International Convention on Load Lines, 1966 - Annex I - Regulations for Determining Load Lines - Chapter III - Freeboards - Regulation 37 - Deduction for Superstructures and Trunks

Regulation 37 - Deduction for Superstructures and Trunks

  (1) Where the effective length of superstructures and trunks is 1.0 L, the deduction from the freeboard shall be 350 millimetres at 24 metres length of ship, 860 millimetres at 85 metres length, and 1070 millimetres at 122 metres length and above (14 inches at 79 feet length of ship, 34 inches at 279 feet length, and 42 inches at 400 feet length and above); deductions at intermediate lengths shall be obtained by linear interpolation.

  (2) Where the total effective length of superstructures and trunks is less than 1.0 L the deduction shall be a percentage obtained from one of the following tables:

Percentage of Deduction for Type 'A' ships
  Total Effective Length of Superstructures and Trunks  
  0 0.1 L 0.2 L 0.3 L 0.4 L 0.5 L 0.6 L 0.7 L 0.8 L 0.9 L 1.0 L
Percentage of deduction for all types of superstructures 0 7 14 21 31 41 52 63 75.3 87.7 100
                       

Percentages at intermediate lengths of superstructures shall be obtained by linear interpolation.

Percentage of Deduction for Type 'B' ships
  Line Total Effective Length of Superstructures and Trunks  
  0 0.1 L 0.2 L 0.3 L 0.4 L 0.5 L 0.6 L 0.7 L 0.8 L 0.9 L 1.0 L
Ships with forecastle and without detached bridge I 0 5 10 15 23.5 32 46 63 75.3 87.7 100
Ships with forecastle and detached bridge II 0 6.3 12.7 19 27.5 36 46 63 75.3 87.7 100
                         

Percentages at intermediate lengths of superstructures shall be obtained by linear interpolation.

  (3) For ships of Type 'B':

  • (a) Where the effective length of a bridge is less than 0.2 L, the percentages shall be obtained by linear interpolation between lines I and II.

  • (b) Where the effective length of a forecastle is more than 0.4 L, the percentages shall be obtained from line II.

  • (c) Where the effective length of a forecastle is less than 0.07 L, the above percentages shall be reduced by:

    where
    f = is the effective length of the forecastle.
Parent topic: Chapter III - Freeboards
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