For ASTM A53, A106 and other codes the accepted thickness tolerances are 12.5%.
The allowable pressure in a 4 inch schedule 40 carbon steel pipe with outside diameter 4.5 in, wall thickness 0.237 in, thickness tolerance 12.5% and allowable stress 16000 psi - can with quality factor E for steel 0.8 and wall thickness coefficient 0.4 be calculated as
p = 2 (0.237 in) (1 - 12.5 / 100) (16000 psi) (0.8) / ((4.5 in) - 2 (0.237) 0.4)
= 1232 psi
Some quality factors according ASME 31.3:
The values of coefficient Y depends on type of material, temperature and thickness limits.
Thickness coefficients when t > D / 6:
Y = (d + 2 c) / (D + d + 2 c) (3)
Thickness coefficients when t < D / 6:
|< 900||950||1000||1050||1100||> 1150|
|Other ductile materials||0.4||0.4||0.4||0.4||0.4|
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Allowable pressure for standard seamless A312-TP316/316L stainless steel pipes - temperatures 100oF to 750oF.
Normal maximum working pressures for steel tubes - in psi and kPa.
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