ASME B31.3 Sample Wall Thickness Calculations
What is the required thickness of NPS 2 threaded A53 Grade B seamless pipe for the following conditions?:
Design pressure = 150 psi
Design temperature = 500°F
Corrosion allowance (CA) = 1/16 in.
SE = 18,900 psi
W = 1.0
D = 2.375 in.
f = 150(2.375)/[2( 18,900 + 0.4 x 150)) = 0.0094 in.
c = CA + thread depth = 0.0625 + 0.07 in.
tm = 0.0094 + 0.0625 + 0.07 = 0.14 in.
The minimum nominal pipe thickness, considering mill tolerance, is
Schedule 80, XS pipe, with a nominal wall thickness of 0.218 in. is acceptable. #Little_PEng
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