1/2 coupler with large OD

jaybone454 · Feb 13, 2016

Hey guy. Hopefully someone can help. Looking for a place to buy large OD 1/2 couplings. Like 1.125 OD. Long story short but i am welding fittings in my keggle and my step bit got away from me. With an oversized hole (1.090) my current couplings (.950) won't weld up nice. So id like to buy a larger OD coupling if they exist. Or ill have to make one. Anyway id appreciate the help.

Jim

IslandLizard · Feb 13, 2016

Can't you weld a washer on it to reduce the hole, then take it from there?

jaybone454 · Feb 13, 2016

I could but im trying to keep it as clean and perfect as possible. Its a polished keg eherms system. Hopefully the last brew rig i build and would like to do it right one time.

jaybone454 · Feb 13, 2016

This is how they have been coming out and im pretty happy until i drilled the hole too big. The tighter the fit to the hole the bet the weld comes out.

http://s2.postimg.org/5kb0k9pe1/20160211_200757.jpg

Ben58 · Feb 13, 2016

1/2"-6000# 1/2 coupling is 1 1/2" diameter.

k1ngl1ves · Feb 13, 2016

Maybe weld a 3/4" and then use a reducer?

Yep. That's all I got. I'm out of ideas...

IslandLizard · Feb 13, 2016

That does look nice and clean. Something that fills the void and looks good should do it. Piece of SS tubing? Or make a narrow sleeve from some 1/16" flat stock or sheet?

jddevinn · Feb 13, 2016

I'd go with a 3/4" to 1/2" reducing coupling placing the 3/4" side on the keggle. Any of these should work depending on how large you want and the style you want.

http://www.mcmaster.com/mv1455311223/#4443k744/=113y0wu

http://www.mcmaster.com/mv1455311223/#51205k226/=113y0sy

http://www.mcmaster.com/#4452k584/=113y0x8

TallDan · Feb 13, 2016

Tri-clamp ferrule and a TC to 1/2" NPT adapter? Clean and will give you some flexibility down the line as well. Or maybe just weld the Tc to NPT adapter in there.

jaybone454 · Feb 13, 2016

Guys thanks for all of the comments and suggestions. A lot of great ideas. Anyway, i a 3/4 reducer isn't going to work because my 3pcs ball valve and swage locks are all 1/2 npt.

Ben58- this is what im looking for. I can have that fitting turned down to size and i wouldn't be noticeable. Do you know where i can buy one? A quick Google search was unproductive.

Ill have to post a thread of how I've done the welding for those who are interested. It was a great learning experience and i think others could benefit. Very easy to do.

Backside of the sanitary weld if anyone is interested.
http://s2.postimg.org/s4rscn0ax/20160213_130222.jpg

jddevinn · Feb 13, 2016

jaybone454 said:
Guys thanks for all of the comments and suggestions. A lot of great ideas. Anyway, i a 3/4 reducer isn't going to work because my 3pcs ball valve and swage locks are all 1/2 npt.

Ben58- this is what im looking for. I can have that fitting turned down to size and i wouldn't be noticeable. Do you know where i can buy one? A quick Google search was unproductive.

Ill have to post a thread of how I've done the welding for those who are interested. It was a great learning experience and i think others could benefit. Very easy to do.

Backside of the sanitary weld if anyone is interested.
http://s2.postimg.org/s4rscn0ax/20160213_130222.jpg

The 3/4"x1/2" reducers I listed all have 1/2" NPT threading on the side that you would connect to. The other side that would be welded to the kettle is simply 3/4"

jaybone454 · Feb 13, 2016

Jd-I need female couplings. Not too sure i understand you. I have all male 1/2 npt fittings which interface with the keg wall. From what i see the reducers you listed all have a different ID pipe thread which will not work.

jddevinn · Feb 14, 2016

the 3/4" side would be on the keggle side and the 1/2" is what you would plumb too..... unless you also want a connection inside the keggle.

Ben58 · Feb 14, 2016

Use this term in a google search - 1/2" 6000# 304 stainless steel coupling. I don't know your location but you will find a number of suppliers of those fittings. Optionally, you can use the term - 1/2" 6000# 304 stainless steel thread-olet, as these are designed to weld to apparent pipe with the weld face machined to match curvature of the parent pipe.

jaybone454 · Feb 14, 2016

Got it. After digging though mcmaster carr this morning i think i found what i need.

http://www.mcmaster.com/#45525k564/=114d3l1

Od is 1.12.

Ill have to update this when i get the part and finish the welding

jaybone454 · Feb 19, 2016

Hey guys. I got the new part from McMaster and everything worked out beautifully.

Turned the coupler down to fit perfectly on my Bridgeport. Since i don't have a lathe i had to improvise.

Also a picture of my back gassing rig.

1/2 coupler with large OD

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