PEX-AL-PEX compression fitting replacement o-rings for leaks

PEX-AL-PEX compression fitting replacement o-rings for leaks

PostBy: qbwebb On: Mon Sep 23, 2013 9:11 am

Does anyone have a source for PEX-AL-PEX compression fitting replacement o-rings? I just shut down for the first time in a year yesterday to do some maintenance and found a bunch of drippy PEX-AL-PEX compression fittings this morning. I originally got my fittings from a dealer on e-bay when I did my install 3 years ago and am wondering if upon cooling down the o-ring "Squeeze" is lost. My fittings have 3 O-rings in them. The way I see it I have 3 options,

1.) Do nothing, start up again and assume the expansion from the heat will re-seal all my fittings

2.) Try to further tighten fittings while I am shutdown to see if that slows down leaks

3.) Try and replace O-rings in fittings (somewhat of a hassle, I have closed cell insulation around most of my fittings).

I Isolated the Boiler H2O w/ shutoffs and then drained the Pex-Al PEX lines so they don't continue to drip for the time being. My setup is in a remote outbuilding installed in 2010, and I have Pex-Al-Pex in a series loop in basement feeding indirect H2O heater (w/ electric backup) and a furnace.
qbwebb
 
Stove/Furnace Make: Harman
Stove/Furnace Model: VF3000

Re: PEX-AL-PEX compression fitting replacement o-rings for leaks

PostBy: Rob R. On: Mon Sep 23, 2013 12:18 pm

Does anyone have a source for PEX-AL-PEX compression fitting replacement o-rings?


Do the fittings have any kind of brand name?

I would check to see if the fittings are loose. Perhaps you can "snug" them and all will be well.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: PEX-AL-PEX compression fitting replacement o-rings for leaks

PostBy: qbwebb On: Mon Sep 23, 2013 12:37 pm

This website says O-rings are EDPM, I suppose I can just measure one and look for spares.

http://www.ardipex.com/pex-al-pex-fittings-screw.php


A Good portion of the fittings I purchased here;
http://www.outdoorfurnacesupply.com/fit ... ssion.html

I think I will just try snugging a few of them up and finish my maintenance then fire up again. These fittings go through a bunch of hot/cold cycles (basically every heat call from the DHW tank), I wonder if the o-rings fatigue over time or if the hot/cold cycles work the compression nut loose. I originally went with these over the crimp style because the tool was really expensive, but I wonder if they were the best choice long term.
qbwebb
 
Stove/Furnace Make: Harman
Stove/Furnace Model: VF3000

Visit Lehigh Anthracite

Re: PEX-AL-PEX compression fitting replacement o-rings for leaks

PostBy: qbwebb On: Mon Sep 23, 2013 8:31 pm

I was able to snug up a bunch of the fittings using my giant crows foot adapter, some of the spots are really tight. Definitely an un anticipated PITA. Some of the compression nuts we're quite loose, very strange, I know I had them tight when I did my instal back in 2010. Funny thing I remember some of the fittings then not leaking with the nut completely off and having zero issues with them when I first started up. tightening the nut up has seemed to do the trick for now. Anyone else have any similar experiences with Pex-Al-Pex and compression fittings?
qbwebb
 
Stove/Furnace Make: Harman
Stove/Furnace Model: VF3000

Visit Lehigh Anthracite