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  1. e9999

    Do you know about NPT threads?

    the issue may be how long the die and tap are, compared to the thread. Unfortunately, IIRC, the die was quite a bit shorter, and I did keep going for a bit with it, so I may have lost some of my taper doing that. added: I measured, and yup, that was it, the die cutters were too short so I...
  2. e9999

    Do you know about NPT threads?

    well, dang. I did some trials. Took some brass nipples and fittings and went to town on the threads with a thread cutter (long story). Something odd happened. After a fair bit of cutting new threads, the male thread barely changed in number of threads engaged. A bit more but less than a...
  3. e9999

    Do you know about NPT threads?

    Yes, may do that. This is the TP valve engagement I'm questioning. I wonder if the threads may have been coated when they did the glass lining. Or just cut incorrectly. If so, I'd rather work on the valve thread first. I don't think I can use a regular pipe threading die as there may not be...
  4. e9999

    Do you know about NPT threads?

    I just get only 3 1/2 turns total with a wrench before I feel like I can't go further reasonably. Probably only 2 turns of that is finger tight. That's with Teflon too. I'm questioning whether either the male or female thread was not cut enough and whether that is an issue for my situation.
  5. e9999

    Do you know about NPT threads?

    thanks. Interesting read. But I'm not concerned about leaking, I'm wondering about structural strength and what should be considered a minimum thread engagement to prevent pushout. I'm zeroing a bit on this, including with the Machinery Handbook but it's a bit unclear still. My impression...
  6. e9999

    Do you know about NPT threads?

    Dealing with an issue with a new water heater I've just gotten. Question: any idea how many turns on a 3/4" NPT thread would be required to resist pushout under 150 psi of water pressure? Or more specifically, do you think that 3 turns would be enough? TIA
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