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Shear Stress Through tapered Pipe Threads

Thread starter tc7
Start date Jul 8, 2003

Status: Not open for further replies.

Jul 8, 2003

tc7

Mechanical

I am trying to calculate the maximum pressure a threaded pipe fitting may withstand when the fitting has a NPT thread (1/4 -18 NPT). The failure mode I am worried about is excess shear load through the thread teeth. For this calculation I cannot determine shear area though the threads (because of the taper), nor can I easily determine length of engagement for an NPT thread.

Thanks to anyone who can provide advice.
tc7