Section 5 Standpipes and branches

Clasification Society 2024 - Version 9.40

Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Special Service Craft, July 2022 - Part 15 Piping Systems and Pressure Plant - Chapter 4 Pressure Plant - Section 5 Standpipes and branches

Section 5 Standpipes and branches

5.1 Minimum thickness

5.1.1 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, D _o and σ are defined in Pt 15, Ch 4, 1.7 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:

5.1.2 In no case does the wall thickness need to exceed that of the shell as required by Pt 15, Ch 4, 2.1 Minimum thickness, Pt 15, Ch 4, 3.1 Minimum thickness or Pt 15, Ch 4, 4.1 Minimum thickness as applicable.

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