Pex tubing temp rating

Pex tubing temp rating

PostBy: mdhorvath On: Tue Oct 29, 2013 7:37 pm

Pex tubing is rated for 180 at 70 psi. What is a safe temp at 20 psi?
mdhorvath
 
Stoker Coal Boiler: AHS S500 Coal Gun
Coal Size/Type: Pea Anthracite

Re: Pex tubing temp rating

PostBy: LDPosse On: Tue Oct 29, 2013 7:42 pm

That may be a question best asked of the manufacturer of the PEX you're using.
LDPosse
 
Stove/Furnace Make: DS Machine, Warm Morning
Stove/Furnace Model: DS1500, WM 400-A, 523

Re: Pex tubing temp rating

PostBy: Sting On: Wed Oct 30, 2013 8:55 am

a better question to ask may be

WHAT IF you I have a temperature overrun and WHAT IF the Pex bursts

WHAT WILL you have then???

Even if you design for normal -- you have to also design for WHAT IF and that may/will eliminate many applications of PEX
Sting
 
Other Heating: BurnHAM=NG-gas


Re: Pex tubing temp rating

PostBy: CoalisCoolxWarm On: Fri Nov 01, 2013 10:23 am

The ratings should be printed on the pex itself. It works well for ng oil or other sources of ondemand heat. But I have been hesitant to use it in a coal/wood system. A temp/pressure relief is helpful with a source of fresh water. A tempering valve is helpful, etc.

But as mentioned above, whathappens ifyouhave a water line failure, the valve sticks, your circulator pump fails, etc?

A boiler can usuallymsurvive a lot of heat, but the pex gets soft as temps rise towards max.

After all, you don't want to be in a situation where youhave to dump the warp core...or emergency cool off to prevent majorhome damage by sacrificing your boiler.

That being said, I've read some who use pex for the last section of line, with everythingnnear the boiler being copper or iron.

Everything is a risk, even coal burning itself. PEX sure is nice with crimpers. I installed a ng boiler system for my fil and it works wonderfully, but I keep telling myself NOT to use it in my baseboard/radiator system (currently offline during a majormremodel, using forced air hand fired), even though it would be easier and faster in some places.


In floor is muc more common for PEX usage, which uses cooler temps, 140-170 typically.

Hope this helps. Sorry for typos, Android systems don't believe users need arrow keys :-)
CoalisCoolxWarm
 
Hand Fed Coal Furnace: old Sears rebuilt, bituminous
Coal Size/Type: Kittanning Seam, Stove size
Stove/Furnace Make: old handfired bituminous

Re: Pex tubing temp rating

PostBy: mdhorvath On: Fri Nov 01, 2013 7:14 pm

I asked pexsupply.com customer service and they said 200 hundred degrees is the max temp. Does not matter that the pressure is lower. As for not using pex, I used up 600 feet of tubing. can't imagine paying for copper! I have the boiler coming on at 150 and it drifts up to around 175. There are 2 dump zones that are set at around 180.Been firing since Sept. 17th with no problems so far(knock on wood).
mdhorvath
 
Stoker Coal Boiler: AHS S500 Coal Gun
Coal Size/Type: Pea Anthracite

Re: Pex tubing temp rating

PostBy: Wiz On: Fri Nov 01, 2013 7:28 pm

Sister inlaw home is 100% plumb with pexs piping that's being heated with a central wood boiler. Hasn't had a issue yet with pexs
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

Re: Pex tubing temp rating

PostBy: tsb On: Fri Nov 01, 2013 7:40 pm

tsb
 
Stoker Coal Boiler: Binford 2000
Hot Air Coal Stoker Stove: LL Pioneer top vent
Hand Fed Coal Stove: Saey Hanover II

Re: Pex tubing temp rating

PostBy: SMITTY On: Fri Nov 01, 2013 7:46 pm

Still not sold on that stuff. Copper's tried and true for over 100 years. Expensive, yes - but it works. Keep the plastic where it belongs - wrapped around a baloney sandwich. ;)
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: Pex tubing temp rating

PostBy: mdhorvath On: Fri Nov 01, 2013 7:49 pm

Wiz wrote:Sister inlaw home is 100% plumb with pexs piping that's being heated with a central wood boiler. Hasn't had a issue yet with pexs

Thank You!
mdhorvath
 
Stoker Coal Boiler: AHS S500 Coal Gun
Coal Size/Type: Pea Anthracite

Re: Pex tubing temp rating

PostBy: grumpy On: Fri Nov 01, 2013 7:54 pm

I think I'll be happy with mine if I ever get it online that is..

I like the fact it bends..
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grumpy
 

Re: Pex tubing temp rating

PostBy: SMITTY On: Fri Nov 01, 2013 7:56 pm

Just what in the hell is that there device Grumpy?? :o You building a nuke reactor? :P Looks damn purty! 8-)
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: Pex tubing temp rating

PostBy: grumpy On: Fri Nov 01, 2013 7:59 pm

SMITTY wrote:Just what in the hell is that there device Grumpy?? :o You building a nuke reactor? :P Looks damn purty! 8-)



Just a manifold, I would have used two single units knowing what I know now, but its in so I'll live with it.. BTW I would never go back to copper after doing this install.
grumpy
 

Re: Pex tubing temp rating

PostBy: SMITTY On: Fri Nov 01, 2013 8:02 pm

Interesting. Last person I talked to that used it said it was a nightmare to work with - kept coiling up like a rattlesnake. Had to feed it 120°+ water to get it to conform. Maybe there's different grades of that stuff?? Who knows ... :confused:

Good to know. 8-)
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler

Re: Pex tubing temp rating

PostBy: Wiz On: Fri Nov 01, 2013 8:03 pm

SMITTY wrote:Still not sold on that stuff. Copper's tried and true for over 100 years. Expensive, yes - but it works. Keep the plastic where it belongs - wrapped around a baloney sandwich. ;)


I got hard water that eats copper like coal ash eats SS. I plumb house with 80 % pex last year when installing ka6, zone 1 is still copper.
Wiz
 
Stoker Coal Boiler: Keystoker Ka 6
Coal Size/Type: Casey Junk Coal :(

Re: Pex tubing temp rating

PostBy: SMITTY On: Fri Nov 01, 2013 8:11 pm

Wow that sucks ... could definitely see that happening. Wonder how they dealt with that in the old days? Must've kept a stockpile of copper out in the shed ... :shock:
SMITTY
 
Stoker Coal Boiler: Patriot Coal - custom built by Jim Dorsey
Hand Fed Coal Stove: Harman Mark III (not currently in use)
Coal Size/Type: Rice / Blaschak anthracite
Other Heating: Oil fired Burnham boiler