Section 7 Standpipes and branches
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 11 Other Pressure Vessels - Section 7 Standpipes and branches

Section 7 Standpipes and branches

Parent topic: Chapter 11 Other Pressure Vessels

7.1 Minimum thickness

7.1.1 The minimum wall thickness, t, of standpipes and branches is to be not less than the greater of the two values determined by the following formulae, making such additions as may be necessary on account of bending, static loads and vibrations:

= where t, p, Do, c and σ are defined in Pt 5, Ch 11, 1.2 Definition of symbols.

If the second formula applies, the thickness need only be maintained for a length, L, from the outside surface of the vessel, but need not extend past the first connection, butt weld or flange, where:

7.1.2 In no case need the wall thickness exceed the minimum shell thickness as required by Pt 5, Ch 11, 2.1 Minimum thickness, Pt 5, Ch 11, 3.1 Minimum thickness or Pt 5, Ch 11, 4.1 Minimum thickness as applicable.

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