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Old 02-07-2012, 08:48 PM   #1
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Pipe unions


I had a professional plumber tell me today that there is a 'correct' way to install typical steel threaded pipe unions...that is, correct orientation relative to the direction (flow) of the water. I didn't catch which side of the union is supposed to 'receive' the water. He did state that for all practical purposes it really didn't matter, but a true plumber always installs them in the correct manner.

Can anybody offer reasoning to this logic?

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Old 02-07-2012, 09:32 PM   #2
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I'd be interested too.

Maybe I've been putting them in backwards for years.

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Old 02-07-2012, 09:41 PM   #3
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I was ready to throw a yellow flag but I didn't because he stated that it really didn't matter. But, as with many trades, the basis for many idiosyncrasies are often rooted in something valid. I just can't figure out what it is for pipe unions.
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Old 02-07-2012, 09:47 PM   #4
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really don't know what he is talking about...BUT...this is what we were told in school...when installing unions..install so that you can pull towards you for the most leverage to tighten...
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Old 02-07-2012, 09:50 PM   #5
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really don't know what he is talking about...BUT...this is what we were told in school...when installing unions..install so that you can pull towards you for the most leverage to tighten...
With a union, aren't you using a backing wrench of some sort, so you are actually pushing and pulling at the same time? At least I do...
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Old 02-07-2012, 09:54 PM   #6
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With a union, aren't you using a backing wrench of some sort, so you are actually pushing and pulling at the same time? At least I do...
you sure are alway use a back up wrench ...just saying what we were told in plumbing school...1974 version..
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Old 02-07-2012, 10:07 PM   #7
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you sure are alway use a back up wrench ...just saying what we were told in plumbing school...1974 version..
Got it. I was 2 years old when that class was taught
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Old 02-07-2012, 10:09 PM   #8
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got it. I was 2 years old when that class was taught
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Old 02-07-2012, 10:23 PM   #9
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I know the reason I need everyone who wants to know to send me 29.95 plus a 3 dollar educational fee and I will send you the answer. No refunds after answers are sent.
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Old 02-07-2012, 11:02 PM   #10
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Quote:
Originally Posted by jlmran View Post
I had a professional plumber tell me today that there is a 'correct' way to install typical steel threaded pipe unions...that is, correct orientation relative to the direction (flow) of the water. I didn't catch which side of the union is supposed to 'receive' the water. He did state that for all practical purposes it really didn't matter, but a true plumber always installs them in the correct manner.

Can anybody offer reasoning to this logic?
Thats odd. I might know that guy. I was told the same thing when I was a pup. I thought he was just pulling my leg.
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Old 02-08-2012, 07:37 AM   #11
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same thing as right handed/left handed broomsmaybe gas unions if even that matters
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Old 02-08-2012, 09:51 AM   #12
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"baby"
I wasn't born yet.
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Old 02-11-2012, 12:45 PM   #13
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I studied the bevels that seat together, and in a way it does make sense to put the nut on the upstream side...maybe more so with steam. Couldn't find a good pic online and forgot to take one when I had the union in my hand. Stupid me.
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Old 02-11-2012, 01:11 PM   #14
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I know around omaha anyway they always put the 1 before the 6 in local 16,oh wait thats the plumbers union not the pipefitters union!

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