Brian G Posted October 6, 2004 Report Share Posted October 6, 2004 I assume that at least some PEX is rated for hot water, but is all of it so rated or are there different types for that? I found some used as piping on a relief valve (ASTMF 876/877). They reduced it to 1/2", so it has to go anyway, I'm just curious. Brian G. Ain't PEX Them Thar Chest Muskles? [:-dunce] Link to comment Share on other sites More sharing options...
Bill Kibbel Posted October 6, 2004 Report Share Posted October 6, 2004 I asked a similar question years ago when CPVC and even PB started appearing as T&PR extensions. The answer I got from the gurus was it should be rated at 210 degrees (the max temp. at which the valves are supposed to open). Anyone else see garden hose for T&PR extensions? What is their temp. rating? Link to comment Share on other sites More sharing options...
Jim Katen Posted October 6, 2004 Report Share Posted October 6, 2004 Originally posted by hausdok . . . Otherwise, if the T & P did blow the thing might flail around like a woman at a bluelight sale in WalMart. ONE TEAM - ONE FIGHT!!! Mike Michael, I am shocked. Shocked and appalled that you would say such a thing. Blue light sales are a *K-Mart* thing. Not a WalMart thing. - Jim Katen, Oregon Link to comment Share on other sites More sharing options...
Brian G Posted October 6, 2004 Author Report Share Posted October 6, 2004 Originally posted by inspecthistoric Anyone else see garden hose for T&PR extensions? What is their temp. rating? I haven't seen that, but about 8 out of 10 I see across the line in Bama has nothing on the relief valve (the infamous "air pipe"). [:-bigeyes Brian G. Link to comment Share on other sites More sharing options...
Paul MacLean Posted October 6, 2004 Report Share Posted October 6, 2004 For years I used to write any plastic T&P drainpipe as "not rated for 210 degrees or 150psi, the temperature and pressure at which the T&P valve opens." I took a lot of grief and got slapped around by codes permitting CPVC (as others have stated). So I backed off and don't make such a big deal about it any more. I just make sure the CPVC isn't close to the flue and discharges correctly. I have yet to see PEX on a water heater; in fact, seeing PEX at all is very rare around here. Link to comment Share on other sites More sharing options...
Jim Baird Posted October 27, 2004 Report Share Posted October 27, 2004 ...For years I used to write any plastic T&P drainpipe as "not rated for 210 degrees or 150psi, the temperature and pressure at which the T&P valve opens." Hey Paul, what you have to remember about the PT discharge is that it is open ended, so the pressure-temp rating for the pipe is moot. I think "size is what matters" here. Link to comment Share on other sites More sharing options...
Paul MacLean Posted October 27, 2004 Report Share Posted October 27, 2004 Originally posted by Jim Baird ...For years I used to write any plastic T&P drainpipe as "not rated for 210 degrees or 150psi, the temperature and pressure at which the T&P valve opens." Hey Paul, what you have to remember about the PT discharge is that it is open ended, so the pressure-temp rating for the pipe is moot. I think "size is what matters" here. Jim...we hope it's open ended![:-timebm] Link to comment Share on other sites More sharing options...
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