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Old 07-15-2012, 04:02 AM   #1
Huaco
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Default Compression fittings.

I am mounting my 1/2" O.D. HERMS Copper coil with 1/2" O.D. Compression fittings. How tight do I need to tighten up the compression side of the connection? I have tightened it down till I heard metal squealing and the coil still moves in the compression nut. (if I wriggle it) Is some movement normal for compression fittings or do I need to lube the threads with some veg. oil and keep compressing the fitting?



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Old 07-15-2012, 04:14 AM   #2
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If its metal to metal compression there shouldn't be any wiggle room. Oring compression on the other hand there might be a little wiggle but not much.



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Old 07-15-2012, 04:16 AM   #3
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Ok... Thanks. I will oil the threads upon re-install.

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Old 07-15-2012, 04:17 AM   #4
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Quote:
Originally Posted by Huaco
I am mounting my 1/2" O.D. HERMS Copper coil with 1/2" O.D. Compression fittings. How tight do I need to tighten up the compression side of the connection? I have tightened it down till I heard metal squealing and the coil still moves in the compression nut. (if I wriggle it) Is some movement normal for compression fittings or do I need to lube the threads with some veg. oil and keep compressing the fitting?
I bet you have a stainless compression nut. Not sure it will compress on the copper. Best bet is remove it and use orings. Think 211 is the size, but check that.
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Old 07-15-2012, 04:35 AM   #5
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It is a brass compression. Got a picture of the o ring method?

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Old 07-15-2012, 01:15 PM   #6
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Hi

Simple answer with any sort of fitting - you should not be able to twist it after it's tightened down. It's a good basic check to do any time you are putting things together.

Bob

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Old 07-16-2012, 01:35 AM   #7
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Quote:
Originally Posted by Huaco View Post
It is a brass compression. Got a picture of the o ring method?
pretty simple, get a bag of silicon orings from McMaster Carr. Replace the compression ring with 1 or 2 orings, hand turn the compression nut till tight, turn 1/4 to 1/2 more.

I think this is the one, number 111 for 1/2 o.d.(works on 5/8 od also). It is the same as the oring from a keg disconnect.

http://www.mcmaster.com/#9396K24

I think I also order 109 back in the day for 3/8 tubing.

here is another useful list of orings
http://www.homebrewtalk.com/f11/mcmaster-keg-o-ring-list-233086/
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Old 07-16-2012, 03:20 AM   #8
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Thanks for the response. This helps my build as well. Is there anything specific about needing "high-temp" o-rings since the herms coil will be up to 175 degrees or no prob?

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Old 07-16-2012, 04:55 PM   #9
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Quote:
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Thanks for the response. This helps my build as well. Is there anything specific about needing "high-temp" o-rings since the herms coil will be up to 175 degrees or no prob?
Just get silicon ones. They are fine. I use them in my bk, hlt, etc..


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