Pressure design of piping for external pressure - ASME B31.3

[svi]

B31.3 refers to the Sec VIII Div 1 procedure for the external pressure
calculations. The allowable external pressure for a given material is
primarily depended upon the thickness of the shell and the length between
the stiffening elements along the length. How is this length, along a
piping run, determined for a calculation. Curved and mitered sections are
also to be treated as equivalent straight sections.

I could not find any reference in the code interpretations,

http://cstools.asme.org/csconnect/pdf/CommitteeFiles/26670.PDF

 

[prex]

Normally a pipe will be treated as having infinite length, unless it is specifically provided with stiffening rings at more or less constant intervals.

prex

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