Section 10 Austenitic and duplex stainless steels
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Ships, July 2022 - Part 5 Main and Auxiliary Machinery - Chapter 12 Piping Design Requirements - Section 10 Austenitic and duplex stainless steels

Section 10 Austenitic and duplex stainless steels

Parent topic: Chapter 12 Piping Design Requirements

10.1 Pipe thickness

10.1.1 The minimum thickness of austenitic stainless steel pipes is to be determined from the formula given in Pt 5, Ch 12, 2.2 Wrought steel pipes and bends 2.2.1 and either Pt 5, Ch 12, 2.2 Wrought steel pipes and bends 2.2.3 or Pt 5, Ch 12, 2.2 Wrought steel pipes and bends 2.2.4. Values of 1,0 per cent proof stress and tensile strength of the material for use in the formula in Pt 5, Ch 12, 2.2 Wrought steel pipes and bends 2.2.1 may be obtained from Table 6.5.2 Mechanical properties for acceptance purposes in Ch 6 Steel Pipes and Tubes of the Rules for Materials.

10.1.2 In no case is the thickness of austenitic stainless steel pipes to be less than that shown in Table 12.10.1 Minimum thickness for austenitic and duplex stainless steel pipes.

Table 12.10.1 Minimum thickness for austenitic and duplex stainless steel pipes

Standard pipe sizes (outside diameter)
in mm 		Min. thickness
in mm
8,0 to 10,0 0,8
10,2 to 17,2 1,0
21,3 to 48,3 1,6
60,3 to 88,9 2,0
114,3 to 168,3 2,3
219,1 2,6
273,0 2,9
323,9 to 406,4 3,6
over 406,4 4,0
Note: Diameters and thicknesses according to national or international standards may be accepted.
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.