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