NPT Torque Values
NPT Torque Values
(OP)
Need help to what is turning out to be an elusive question.
We have female 3/4" NPTF threads (material SA-105) mating to a stainless steel (304/316) valve with NGT threads.
We are using Teflon tape.
Could someone tell me what the acceptable torque range is to install these valves - leak free?
We have other pipe thread sizes for this situation also - any info or reference would be appreciated.
Thank you.
We have female 3/4" NPTF threads (material SA-105) mating to a stainless steel (304/316) valve with NGT threads.
We are using Teflon tape.
Could someone tell me what the acceptable torque range is to install these valves - leak free?
We have other pipe thread sizes for this situation also - any info or reference would be appreciated.
Thank you.





RE: NPT Torque Values
According to "The Pipe Fitters Blue Book" W.V. Graves, 1973.
The amount of thread engagement must be 9/16" for a "tight joint"
Hope this helps.
RE: NPT Torque Values
RE: NPT Torque Values
For API - Power tight on these types of threads regardless of the size - is 2 complete turns past the hand tight plane.
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RE: NPT Torque Values