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Old 01-07-2018, 07:39 AM   #1
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Bending 3/4 PEX


I'm working on a water filter system and I decided to use 3/4" 90 pipe supports (metal) instead of elbow joints but I'm having a lot of trouble bending the PEX into the brackets without kinking.

I'm using a heat gun which helps and also putting sand inside the PEX segment to prevent kinking. It's quite fiddly and difficult and my best attempt still has a slight kink. I could probably get away with it but I'm really not happy with the result.

Is there a secret to bending 3/4" PEX? Is there more flexible 3/4" PEX I can buy? Not having any troubles bending 1/2". I'm about to abandon the idea and just use elbow joints...



Here is the bracket:
http://www.sharkbite.com/sharkbite/w...ds/23054_3.jpg

I'm using regular 3/4" blue PEX from Lowes.

Any advice would be appreciated!

Last edited by tom_poconos; 01-07-2018 at 07:44 AM.
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Old 01-07-2018, 07:52 AM   #2
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Re: Bending 3/4 PEX


either use type A PEX or go with fittings....
no more flow loss through the 90s than would
occur in that filter cartridge as it clogs with time

what are you attempting to filter?

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Old 01-07-2018, 08:15 AM   #3
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Re: Bending 3/4 PEX


Thanks. I thought the 90s would be worthwhile due to better flow rate over elbows, but we're probably talking minuscule figures... not worth the headache?

I'm filtering well water. It's moderately hard with some sediment.

I'm doing a bunch of things in tandem - replacing an old leaking well pressure tank, adding a 3-piece (size 1 big blues) sediment filter system and adding a water softener, in three stages. And after that, replacing old copper with PEX line by line, as I slowly renovate the whole cabin.

Should be finished by 2030

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Old 01-07-2018, 08:42 AM   #4
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Re: Bending 3/4 PEX


how many plumbing fixtures in cabin?
if you're getting fair amount of sediment
I'd recommend a spin down filter or
possibly even a sediment trapper if needed
I'm sure there is a demo on you tube

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Old 01-07-2018, 09:08 AM   #5
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Re: Bending 3/4 PEX


There's 3 h/c taps, 1 cold tap (laundry tub), 2 toilets, 1 shower. Water heater. That's about it. The sediment isn't too bad - though it's going to be a experimental process determining what micron filters to use. The housings came with 3 filters each so I may as well start with those. I'm going to put a 150 sediment trap infront of 2 identical filters in parallel. In hindsight i should have just bought 1 large big blue instead of doing 2 smalls in parallel. Will run unfiltered water to the toilets (eventually).

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Old 01-07-2018, 10:27 AM   #6
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Re: Bending 3/4 PEX


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Originally Posted by tom_poconos View Post
Will run unfiltered water to the toilets (eventually).
What you save in filter replacements you will likely make up in shortened life of the toilet, and aggravation. Hard water clogs the little flush jets that swirl the water in the bowl.
Although, you can clean them with pipe cleaners and CLR, changing a filter sounds like more fun.
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Old 01-10-2018, 08:25 PM   #7
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Re: Bending 3/4 PEX


I have kinked countless sections of 3/4 pex trying to get them in those stupid supports. Had a few that kinked after being in the support for a couple of hours.

Cut out, coupling, then a 90. Gave up on them a long time ago. Didn't save much in the way of time anyway.
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Old 01-10-2018, 10:07 PM   #8
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Re: Bending 3/4 PEX


I have used plenty and never had a problem.
3/4 just takes a bit of strength to hold the bend and snap in the pipe.

Never used heat or anything else.
But I do use the plastic bends. I know I tried the metal ones years ago. Cant remember why. But I did not like or use them after trying one.
Went to the plastic ones. Use a few different brands over the years and not a problem.

I use them when I can. Less fittings the better.
And more freeze protection if ever needed. Pex can freeze and expand. But not the fittings.

Last ones I got at here
https://www.supplyhouse.com/PEX-Bend-Supports-719000

S

Last edited by RRH; 01-10-2018 at 10:10 PM. Reason: add
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Old 01-11-2018, 08:18 AM   #9
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Re: Bending 3/4 PEX


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I have used plenty and never had a problem.
3/4 just takes a bit of strength to hold the bend and snap in the pipe.
You must be using PEX-A. There's no way in hell you can bend 3/4 PEX-B without a heatgun and without kinking... I abandoned my attempts and just used elbow fittings.
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Old 01-11-2018, 08:48 AM   #10
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Re: Bending 3/4 PEX


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Originally Posted by tom_poconos View Post
You must be using PEX-A. There's no way in hell you can bend 3/4 PEX-B without a heatgun and without kinking... I abandoned my attempts and just used elbow fittings.

Not sure what you are talking about. We have been using about 15 years. With Pex B and the crimp on fitting. First started with the Zurn brand.

And never not once even considered the hassle of using a heat gun. If we had to do that in a crawl space. We would have never used the bends and just put in a fitting.
Have you tried the plastic bends. I do think they had a longer sweep bend.
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Old 01-11-2018, 08:49 AM   #11
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Re: Bending 3/4 PEX


I have done many whole houses in pex including radiant floor heat and never once used a molded corner. Just bend the tube naturally as far as you can and attach with nail strap. Why buy extra accessories?
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Old 01-11-2018, 08:50 AM   #12
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Re: Bending 3/4 PEX


I've not used Pex but right or wrong or possibly inaccurate, find this article interesting. I do find it odd minimum radius for bending each size and type wasn't mentioned.

https://www.pexuniverse.com/content/types-of-pex-tubing

Last edited by SeniorSitizen; 01-11-2018 at 08:55 AM.
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Old 01-11-2018, 10:29 AM   #13
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Re: Bending 3/4 PEX


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Originally Posted by Yodaman View Post
I have done many whole houses in pex including radiant floor heat and never once used a molded corner. Just bend the tube naturally as far as you can and attach with nail strap. Why buy extra accessories?
Because you want a tighter bend.

What is good for radiant heat is not the same.

One example. If coming out of a wall with 3/4" pex and need to bend to go down to a water heater. Or in a crawl going up in a wall. Without a bend it would look very sloppy with the extra pipe hanging down in a crawl space. Instead of nail tight up to the joist.
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