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Old 02-13-2009, 01:41 PM   #1
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Gas line union installataion


I have a couple questions on the proper way to install a 1/2" black gas union.

The union came in plastic and is coated with oil to prevent rusting. Should I degrease it for a better seal or is that not required?

I expect to use pipe dope on the male pipe threads that connect to both female ends. Should I use dope on the inside copper seat where the union meets, or is that considered a compression seal and using dope could prevent a good seal?

Does it matter which direction the union is installed? I would think gas should flow into the female brass seat since the other end has a male flare if you will. See picture.
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Old 02-13-2009, 05:57 PM   #2
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Gas line union installataion


Dope the pipe threads. Do not dope the seat. It is a machine fit.

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Old 02-13-2009, 07:04 PM   #3
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Gas line union installataion


Ok. Does anyone know the answer to the other questions?

1. Do I need to degrease the fitting?

2. Does it matter which end gets connected to the supply line from the ceiling?
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Old 02-14-2009, 06:26 AM   #4
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Gas line union installataion


Ayuh,..

Degreasing is Unnecessary,...

I've found them headed both ways over the years,...It doesn't seem to matter...
When I'm installing them, I put the piece on the right in your picture Upstream,+ the 1 on the left downstream..

And, as noted,.. Dope up Only the Pipe threads,... Not the seat, nor the locking collar threads...
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Old 02-14-2009, 10:25 AM   #5
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Gas line union installataion


Thats what I thought but wanted to double check. Thanks for your help.
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Old 02-14-2009, 12:59 PM   #6
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Gas line union installataion


If there is "dripping" oil inside the union halves or on the seating faces, wipe it off since it may also contain dirt that could prevent a tight fit. I always install unions with the "nut side" on the supply side of the piping. This is in agreement with your thinking. If all unions are installed the same direction, you can always tell the flow direction with just a glance at the nut. No pipe dope is needed or used on the mating surfaces or the nut threads. I am guilty of using Never-seez on the nut threads for ease of removal if ever necessary.

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