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Old 05-20-2013, 04:34 PM   #1
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leak in gas fitting at furnace


this union in the gas line just as entering the furnace has a minor leak that , at times, can hardly be detected.

Can i tighten this type of fitting , or should it be replaced?

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Old 05-20-2013, 04:43 PM   #2
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leak in gas fitting at furnace


What kind of pipe is that?
The whole thing was suppost to be black iron.
Why is there even a union there?

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Old 05-20-2013, 05:06 PM   #3
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leak in gas fitting at furnace


It's all supposed to be Black iron like your union fitting as galv pipe supposedly can internally slough off debris that can damage the gas valve.
In my area there is no problem with that union fitting location provided that there is adequate room to work your wrenchs.

Soap the fittings and if you detect any bubbles, use two wrenches to tighten it up while not putting the downstream fittings under too much torque. Usually only cross threading will require the replacing of the union.
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Old 05-20-2013, 05:07 PM   #4
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leak in gas fitting at furnace


I would try tightening it one time if that don't work replace it with another one.

@ Joe, usually there is a union right before the pipe goes into the casing on the heater in case the gas valve needs to be replaced you can remove it without much trouble.

LEAK CHECK, LEAK CHECK, LEAK CHECK.
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Old 05-20-2013, 05:16 PM   #5
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leak in gas fitting at furnace


Were required to use a SS flex line, no unions.
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Old 05-20-2013, 05:17 PM   #6
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leak in gas fitting at furnace


shut the gas going into the furnace and brake that union apart.check both sides of that unions seats if its leaking out the threads..reinstall it hand tight and double wrench to tighten it ..put a rag under it spray it with a dishwashing soap mix
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Old 05-20-2013, 05:28 PM   #7
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leak in gas fitting at furnace


tighten the thing.. .. if it stops leaking go fishing or golfing.....
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Old 05-20-2013, 07:27 PM   #8
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leak in gas fitting at furnace


I have found leaks like this before. I have used a TINY AMOUNT of pipe dope on the threads of the union simply for lubrication purposes so it pulls tight. If it is as tight as you can get it and still leaks, then it's time for a new fitting.

And like everyone has told you.... LEAK CHECK after tightening or replacing!! You really shouldn't use dishwashing soap, but if you rinse the fittings afterwards you should be fine. Your local hardware store should have leak detector solution. It is not that expensive.
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Old 05-20-2013, 08:19 PM   #9
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leak in gas fitting at furnace


Thank you all....but its neither fishing nor golfing....its in the user name.

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