Section 3 Application
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 3 Ship Structures (General) - Chapter 4 Longitudinal Strength - Section 3 Application

Section 3 Application

Parent topic: Chapter 4 Longitudinal Strength

3.1 Symbols

3.1.1 The symbols used in this Section are defined as follows:

b = breadth, in metres, of the hatch opening. Where there are multiple openings abreast, these are regarded as a single opening, and b is to be the sum of the individual breadths of these openings
H = length of the hatch opening, in metres
BH = distance, in metres, between centres of the deck strip at each end of the hatch opening. Where there is no further opening beyond the one under consideration, the point to which BH is measured will be considered, see also Figure 4.3.1 Deck opening size
B 1 = extreme breadth of deck including hatch opening, measured at the mid-length of the opening, in metres.

Figure 4.3.1 Deck opening size

3.2 General

3.2.1 The requirements of this Chapter apply to sea-going steel ships, of normal form, proportions and speed, unless direct calculation procedures are adopted, in which case the assumptions made and the calculations performed are to be submitted for approval.

3.2.2 The requirements in this Chapter are not applicable to Double Hull Oil Tankers or Bulk Carriers with a CSR notation. See Pt 1, Ch 2, 2.3 Class notations (hull).

3.3 Exceptions

3.3.1 Individual consideration based on direct calculation procedures will generally be required for ships having one or more of the following characteristics:

  • Length L greater than 400 m.
  • Speed V greater than that defined in Table 4.3.1 Ship speed criteria for the associated block coefficient.
  • Unusual type or design.
  • Unusual hull weight distribution.
  • Large deck openings, or where warping stresses in excess of 14,7 N/mm2 are likely to occur.
  • Openings for side loading in way of both sheerstrake and stringer.
  • C b < 0,6
  • Carriage of heated cargo, see Pt 4, Ch 9, 12 Cargo temperatures.

Table 4.3.1 Ship speed criteria

Ship length L,m Cb Speed,

knots

<200

> 0,80

= 0,70

< 0,60

17

19,5

22

> 200

> 0,80

= 0,70

< 0,60

18

21,5

25
NOTE

Intermediate values of speed to be obtained by linear interpolation for Cb

3.3.2 A ship is regarded as having large deck openings if both the following conditions apply to any one opening:

See also Figure 4.3.1 Deck opening size.

Copyright 2022 Clasifications Register Group Limited, International Maritime Organization, International Labour Organization or Maritime and Coastguard Agency. All rights reserved. Clasifications Register Group Limited, its affiliates and subsidiaries and their respective officers, employees or agents are, individually and collectively, referred to in this clause as 'Clasifications Register'. Clasifications Register assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on the information or advice in this document or howsoever provided, unless that person has signed a contract with the relevant Clasifications Register entity for the provision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in that contract.