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NPT Vs NPTF

NPT Vs NPTF

NPT Vs NPTF

(OP)
I have supplied 10 pressure components on which 1" NPTF thredolet was required by drawing.
Test certificate for thredolet shows 1"NPT & hense customer has rejected all the components.
What is the difference in above two threading.
Is there any chance that above material will get accepted?
I need to reply to customer on above mess.

RE: NPT Vs NPTF

Is the test certificate incorrect about the thread?

Ted

RE: NPT Vs NPTF

(OP)
TC is correct .

RE: NPT Vs NPTF

If the TC is correct, then you used the wrong thredolet and the customer is correct in rejecting them.
 

"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

RE: NPT Vs NPTF

A thredolet is by definition a branch fitting with a female NPT thread in it.  There is a male threaded "Olet" and I can't think what it is called right off (don't use them - rarely see them).

So on that basis, listing a thredolet with a FNPT thread is superfolous.  If you said thredolet, you said female threads, and the only thing to determine then is if they are NPT or BST or some other standard.

Google the word "olet" and see what pops up.

rmw

RE: NPT Vs NPTF

My current operating hypothesis about the reason for using 'F' as a suffix to denote 'dryseal' is that it's somebody's subtle joke, and means 'fantasy'.

.... because I have never seen one actually seal without some kind of thread sealant applied.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: NPT Vs NPTF

I believe the 'F' was to indicate fuel service.

Ted

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