Propex

ChrisJ

Just out of curiosity what part is the primary seal? Is it #1 or #2?

Alan (California Radiant) Forbes

I'd say #2 has a bigger and better bite.

hot_rod

when you disassemble a crimp type pex fitting they often look like this. So I would say the first ring on the end is primary, inner is secondary.

ChrisJ

> @hot_rod said:
> when you disassemble a crimp type pex fitting they often look like this. So I would say the first ring on the end is primary, inner is secondary.

Do you think that creates a place for things like legionella to grow?

hot_rod

depends on the temperature, legionella bacteria is all around up. remember the first know case was from potting soil.

Temperature above 140, or chemicals are two known ways to eliminate bacteria growth.

Or herd immunity

ChrisJ

> @hot_rod said:
> depends on the temperature, legionella bacteria is all around up. remember the first know case was from potting soil.
>
> Temperature above 140, or chemicals are two known ways to eliminate bacteria growth.
>
> Or herd immunity

Not sure that works with bacteria?

Another pex question.
I plumbed our bathroom in pex a. There's two huge windows that have shades pulled down but still quite a bit of sun light gets in. I need time to get things finished. Like, a few months.

Am I right in assuming indirect sunlight isn't a concern?

Intplm.

@ChrisJ I ran into a similar situation when some one "temporarily" installed pex in front of a window. There was no shade used. The pex, with no shade was brittle and leaking within a couple years.

The pipe was changed and shades installed (and screwed in the down position. )Since the shades, its been many years now and no leaks.
So you are correct. When not in direct sunlight, this should not be a concern.

Solid_Fuel_Man

UV light, natural or artificial, is bad for PEX. Slide some cheap home depot split foam black insulation over it.

ChrisJ

> @Solid_Fuel_Man said:
> UV light, natural or artificial, is bad for PEX. Slide some cheap home depot split foam black insulation over it.

Apparently you haven't been near a store in New Jersey lately. I won't be going near one for quite a while. If it's an actual known issue I would of course go out of my way to fix it. However if it's likely not an issue I'd rather not waste precious time and money.

That being said there led lights im using in theory produce zero or very close to zero uv.

Intplm.

When you can, do what @Solid_Fuel_Man said about using pipe insulation is something I have done too. A really good idea.

hot_rod

Get some latex paint and coat the Pex 😳 Manufacturers indicate required protection, if yours meets all the tube criteria, no worries.
Top brands of Pex have the best protection and highest listings.

All those numbers on Pex indicate what the tube is tested to for chlorine, UV, temperature/ pressure, O2 ingress, fitting comparability, and more.

ChrisJ

> @hot_rod said:
> Get some latex paint and coat the Pex 😳 Manufacturers indicate required protection, if yours meets all the tube criteria, no worries.
> Top brands of Pex have the best protection and highest listings.
>
> All those numbers on Pex indicate what the tube is tested to for chlorine, UV, temperature/ pressure, O2 ingress, fitting comparability, and more.

That's the thing.
All I can find from Uponor is that my stuff is rated for direct sun exposure for 1 month. No info on indirect exposure or even protecting it from sunlight indoors just from light fixtures etc.

mattmia2

Painting pvc conduit and electrical service cable that is exposed outdoors is a good idea for the same reason. You should see what UV does to anything plastic up on an antenna tower or on a roof.

ChrisJ

> @mattmia2 said:
> Painting pvc conduit and electrical service cable that is exposed outdoors is a good idea for the same reason. You should see what UV does to anything plastic up on an antenna tower or on a roof.

This is why I'm still confused as to why you're allowed to run PVC vents out through the roof without protection.

Fred

http://www.jmeagle.com/sites/default/files/TB10SunlightEffectsonPVC.pdf

mattmia2

because a pipe sticking out of a roof never gets impacted by anything. probably explains how vinyl siding gets hail damaged too.

Solid_Fuel_Man

Remember that PVC and PEX are not even remotely the same! Cross linked polyethylene, has a limited UV resistance. I believe chemicals can be added to make it UV resistant, but those are not what you want in water pipe. XLPE insulation (cross linked polyethylene) has been used for decades on triplex overhead wire, which is likely feeding just about every home in the US, since the 1960s.

haventseenenough

Looks like the fitting has a poor crimp by looking at all three fittings.

ChrisJ

haventseenenough said:

Looks like the fitting has a poor crimp by looking at all three fittings.

Crimp?
What three fittings?


Ahh, the ones @hot_rod posted.
Why do you feel they were poor?

@Solid_Fuel_Man
I think everyone knows pex is completely different than PVC.
But I suspect latex paint may be protective for both, no? I painted the Armaflex on my lineset to protect it from the sun.