I have a problem about wall thickness pipe.
How to determine minimum wall thickness pipe?
beside, B31.3, b31.4 and b31.8 formula. are there other factor that influence for minimum wall thickness.
If you enjoy doing the mathematics, then the Von Mises-Hencky equation for triaxial state of compression is dependent upon the internal bore pressure and physical pipeline cross sectional geometry.
Of interest is the fact that wall material stress is a linear correlation to both these factors, something frequently overlooked in the literature. The Von Mises-Hencky equation is a natural extension of Thick Wall Pressure Vessel Theory of which a pipeline is treated infinitely long. You could get fancy and model longitudinal stress as thermal expansion/contraction, but this would presuppose that those steel properties were well understood.
Of course the easy way to do it is open a basic textbook on Mechanics of Materials, go to the appendix and look for Pressure Vessel Theory.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada