Clasification Society Rulefinder 2016 - Version 9.25
Clasification Society Rules and Regulations - Rules and Regulations for the Classification of Offshore Units, January 2016 - Part 4 STEEL UNIT STRUCTURES - Chapter 1 General - Section 2 Direct calculations

Section 2 Direct calculations

Parent topic: Chapter 1 General

2.1 General

2.1.1 Direct calculations may be specifically required by the Rules or may be submitted in support of alternative arrangements and scantlings. LR may undertake independent calculations to check the calculations submitted by the designers.

2.2 Equivalents

2.2.1 In addition to cases where direct calculations are specifically required by the Rules, LR will consider alternative arrangements and scantlings which have been derived by direct calculations in lieu of specific Rule requirements. All direct calculations are to be submitted for examination.

2.2.2 Where direct calculation procedures are employed supporting documentation is to be submitted for appraisal and this is to include details of the following:
  • Calculation methods, assumptions and references.
  • Loading.
  • Structural modelling.
  • Design criteria and their derivation, e.g., permissible stresses, factors of safety against plate panel instability, etc.
2.2.3 LR will be ready to consider the use of Builders’ programs for direct calculations in the following cases:
  1. Where it can be established that the program has previously been satisfactorily used to perform a direct calculation similar to that now submitted.
  2. Where sufficient information and evidence of satisfactory performance is submitted to substantiate the validity of the computation performed by the program.
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