what is easiest way to loosen galvanized dielectric union?

Darrell_4

Yes...but, make sure that you ignore the leak for at least six months so that the union is barely recognizable and allows lots of new water to be added to the system. If you are lucky, the union is placed so as to allow a pump to charge the system with air. Then, you are ready to mount a full scale union fixing project. but, it's kinda fun if you like that sorta thing!

Not a huge fan of dielectric unions...

Dave_61

We have a dielectric union that has a slow leak. I know that many people on this board are not crazy about them. It was fine all winter but seems to drip now that the boiler only is running intermittently. I bought a high temp gasket (EDPM) and am hoping this will do the trick as it is close to the output of the boiler. However, I could not budge the union with 2 pipe wrenches. Are there any other tricks anyone has up their sleeves? I even put a length of pipe on one wrench to increase the torque, but no go. Thanks.

bob young

new york city smackdown method

take two hammers .one to smack on the square wrench pads as hard as possible & one to hold on opposite side to absorb the blow. you will just about be able to turn by hand.

Mike C._4

variation

Two hammers will work. I also use two hammers to tap opposite flats in the off direction at the same time (at an angle). Usually beats pipe wrenches for stuck unions.

Mike

Rich L.

Length of pipe

Put your length of pipe on each wrench. Make em long enough and it'll break loose. Caution: If they're aluminum they may not be perfectly straight after you do this! Another caution: what ever trick you try, wear safety glasses while you're doing this. Anytime you start smacking fittings or anything else for that matter be sure and protect your eyes.

Good Luck

Dan_53

You guys are great....

I stood a pipe wrench up under the fitting to wedge it tight and support it (fitting is about 1.5 feet off floor). Then I gave a few solid whacks with small sledge. Came right apart. Thanks again.

bob young

replace

now that you took it apart, replace it with regular or flange union

Darrell_4

I usually just go out to the truck and get my hand DeWalt 18v Sawzall and cut the thing out prior to replacing it with a bronze union. Winds up being faster in the long run.

Dave_61

Will the EDPM

gasket also eventually leak? We have 4 or 5 unions in the system. The only one that leaks (knock on wood) is the one that is about a foot from the boiler output. Water temp gets to about 180 deg. The person at Watts Regulator said that EDPM gasket is made for steam/higher water temps and should solve problem. So far, no leak after replacement (again, knock on wood).

EricAune

Right on

What Darrell said is about right

Unknown

what the die-electric unoins

Doing on the heating system in first place? They are not needed and will leaks now matter what. Get rid of them all in same time. Less make up water when doing it so.

mtfallsmikey

We had

A local AHJ require them...for a brief period. You know the rest of the story....