"Ned Simmons" wrote in message
...

The argument that tapered pipe threads are not intended to
carry a tension or compression load is nonsense. (I don't
mean to imply you said this, Jim.) If there is pressure in
the pipe, then there is an axial force on the joint equal
to the pressure x area of the pipe ID.

Ned Simmons

And that may run a couple of hundred psi. Those loads on plumbing pipe from
internal pressure are nowhere near the strength expected of mechanical
tubing in tension or compression, Ned.

Ed Huntress