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Old 10-26-16, 10:28 AM   #1
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Default Tips / Tricks for getting threaded pipe to seal?

I was helping out my father in law install an on demand water heater last night. The heater has 1/2" threaded pipe fittings coming out of it. So, we ran to the store and grabbed all the stuff we needed (valves, fittings, etc) and came back and installed it. We pressurized it and had a few leaks. So we removed it, tightened them up as much as we thought safe and reinstalled it. Still leaking. We used teflon tape on every joint and I'd say nearly half of them leaked. This seems ridiculous.

So, what tips do you guys have for getting threaded pipe connections not to leak?

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Old 10-26-16, 11:34 AM   #2
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Daox,

Don't feel bad . . . .

Teflon pipe tape works great if the threads are in good shape. More recently, the quality of metal pipe threading has gone to hell.

I never had leaks, in the past, but I get them regularly now if I just use teflon tape.

I still use teflon tape on the outside threads, but now always use pipe "dope" on the inside threads. A bit more time, but NO leaks.

Hope this helps.

Steve

ps pipe dope is messy and nasty . . .
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Old 10-26-16, 01:02 PM   #3
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What stevehull said. I don't rely on teflon tape anymore unless it's a tiny (ie 1/8" NPT or smaller) fitting.
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Old 10-26-16, 10:41 PM   #4
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Thanks guys, I'll have to give that a try next time.
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Old 10-26-16, 11:18 PM   #5
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For Really Really bad pipe threads I've resorted to 5 min epoxy.

Randen

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Old 10-27-16, 06:27 AM   #6
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Randen - I have also used silicone based caulk (the kind that cures to rubber). Will keep your suggestion of 5 minute epoxy in mind also.

I guess we have all found that threading has gotten rather bad . . . .

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Old 10-27-16, 09:11 AM   #7
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Yeah, I did notice that while threading the pieces together it was not a nice smooth process. The joints felt 'gritty' for lack of a better word and didn't engage nice and smoothly.
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Old 01-11-17, 02:24 PM   #8
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Use hydraulic fracturing rated pipe dope. Since fracking uses preasures in excess of 9,000psi at the well head and something like 13,000 or 14,000psi at total deapth you know it will work.
I used it on my 7hp gasoline pressure washer which runs some where between 2,000 and 2,500psi on its pipe thread connections since 2008 and I don't think any have ever leaked. The only ones that leaked were the ones I used Teflon tape on.
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Old 01-12-17, 10:34 AM   #9
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Where do you get said pipe dope?
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Old 01-12-17, 01:57 PM   #10
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Lowes used to have it.
After I posted this I went there to get some lumber and figured I would check to see if they still have it and they do not.
It was "gasoila" rated for -100F to +600F and10,000psi.

But I think any 10,000psi rated pipe dope would work just as well.

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