The ASME B&PV code gives an eq'n to calculate minimum required pipe wall thickness for given pipe dimensions (OD,ID), design pressure and allowable stress on the pipe material. The eq'n also includes an 'A' factor, which is to account for additional thickness required for, say, material removed due to threading. For taper threads, the A value to be used is the thread depth. This seems only to account for the thread depth, neglecting the taper of the thread itself. Is the assumption in the code that NPT connections will be engaged all the way to the vanish threads and therefore the wall thickness reduction due to taper is not an issue? Or is there a section of the code which allows one to neglect the wall thickness variation due to the taper entirely? Any advice would be much appreciated.
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