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ASME B31.1 Pipe Thickness Calculation Interpretation

ASME B31.1 Pipe Thickness Calculation Interpretation

ASME B31.1 Pipe Thickness Calculation Interpretation

(OP)
There is some debate in my office on how to interpret/apply the sections 102.4.5 and 104.1.2 of ASME B31.1.  I am transproting seawater for which I have been instructed to use a 0.05-in Corrosion Allowance (A).   I am being told not to apply the factor for bending (1.25 for 3D bend for example) to to the whole equation for t(min).  I am instead directed to multiply the factor for bending to only the first term of Equation 3B in 104.1.2.  The logic is that the 0.05_in allowance is plenty large enough to account for corrosion and does not need to be increased any further.  I'm not sure if I agree with this, so I thought I would get some more opinions.  Thanks.  

RE: ASME B31.1 Pipe Thickness Calculation Interpretation

I agree with the way you have been instructed to do the calcs.  I have always calculated required pressure and bending stress thickness requirements first, then added the corrosion allowance to the result.

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