Threaded Pipe Installation 1

[algerrl]

Where can I find the minimum and maximum installation torque for NPT threaded pipe? Is there a pipe-fitters manual somewhere? I need this for the design of the threaded body/adapter joint on our threaded-end ball valves.

 

[MikeHalloran]

I don't know if there's a standard or not, but I'd suggest a higher design torque level than that.

If I were able to fracture your valve with the amount of torque I could exert through a good pipe wrench's teeth, with a handle of arbitrary length, without stripping the outside surface off the pipe, I'd speak ill of your valve.



Mike Halloran
NOT speaking for
DeAngelo Marine Exhaust Inc.
Ft. Lauderdale, FL, USA

 

[TBP]

Check the "Piping And Fluid Mechanics Engineering" forum for thread 378-5045 "Torque For NPT Connections". Measured torque doesn't come into play, for a variety of reasons.

 

[jsummerfield]

Threaded fittings do not necessarily coincide with pipe wrenches. I often buy hex nipples or threaded fittings with wrench flats.

John