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Old 06-05-2009, 06:01 AM   #1
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Default welding a locknut onto a kettle

so i bought an NPT coupling off mcmaster and planned to have it welded onto my kettle. however, whether or not the elements screw in enough seems to be hit or miss. i just got some of the stainless locknuts from bargain fittings, and all the elements i have screw in nicely. is there any downside to having one of the locknuts welded on instead of the coupling?

thanks,
p.d.

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Old 06-05-2009, 01:09 PM   #2
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If you are going to weld, weld on a coupling!

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Old 06-05-2009, 01:25 PM   #3
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I have what looks like the same nut as listed on Barging Fittings and plan to weld it to the outside of the keg. Right now I am using it weldless to hold my element on. I plan to have the gasket groove facing the element. I do not see why it will not work. I originally wanted to use a coupling but that will require me to make some other changes to my setup.

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Old 06-05-2009, 02:21 PM   #4
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Quote:
Originally Posted by Poobah58 View Post
If you are going to weld, weld on a coupling!
the problem is the NPT coupling and the straight threaded heater elements. sometimes they play well together, sometimes not. the locknut is almost the size of a half-coupling on it's own.

have you had luck screwing elements into the couplings?
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Old 06-05-2009, 02:27 PM   #5
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Both of my elements on my HLT are screwed into a 1/2 coupler that I welded into place. They don't really feel like they work well together, but they do. Also I have since burned up one of my elements and had to remove and reinstall one, and it worked out just fine. I would go w/ the coupling myself.

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Old 06-05-2009, 02:50 PM   #6
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I have 2 pots with 1" couplings and have no problems getting the elements in and out. Is there enough thread on a locknut to prevent leaking?

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Old 06-05-2009, 03:18 PM   #7
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I assume you have to be liberal with the thread sealant or teflon tape. NPT and NPS sorta sometimes mesh, but I doubt it would be leak free with no sealant.

If I were doing it, I'd be silver soldering the locknut to the kettle.

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Old 06-05-2009, 03:20 PM   #8
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Bobby, the threads don't make the seal. There's a gasket that does.

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Old 06-05-2009, 03:29 PM   #9
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Quote:
Originally Posted by Poobah58 View Post
I have 2 pots with 1" couplings and have no problems getting the elements in and out. Is there enough thread on a locknut to prevent leaking?

The nut has a groove on it for a o-ring. I think it will work. Time will tell ..LOL
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Old 06-05-2009, 04:21 PM   #10
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Quote:
Originally Posted by Yuri_Rage View Post
Bobby, the threads don't make the seal. There's a gasket that does.
You actually get enough turns to the point where the gasket makes contact? That's surprising to me though I've never threaded 1" NPS into NPT either. At 1/2", you get maybe 1 full turn before it binds.
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