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ASME B31.3 Sample Wall Thickness Calculations


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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