allseason Posted June 13, 2012 Report Share Posted June 13, 2012 Is this pvc allowed as a drain pipe on a water heater TPRV? Labeled: Schedule 40 PVC ASTM D-1785 Click to Enlarge 50.23 KB Quote Link to comment Share on other sites More sharing options...
resqman Posted June 13, 2012 Report Share Posted June 13, 2012 Last time I checked the IRC, PVC is not rated for hot water use and is not allowed. PEX, Copper, CPVC, Steel but not PVC Quote Link to comment Share on other sites More sharing options...
Mark P Posted June 13, 2012 Report Share Posted June 13, 2012 Around here in some towns you cannot use CPVC on the TPRV extension. Over the winter I renovated a home. 100% new plumbing. All the old cast iron drains were replaced with PVC and the galvanized water lines were replaced with CPVC. On the new water heater I had CPVC on the TPRV extension. When the county came in to inspect they made me replace the extension with metal. It is a real head scratcher, here is a house with ever inch of water line made of CPVC and yet the extension had to be metal. I suspect part of the reason was so they could charge me for another inspection to come back and confirm it was replaced w/ metal. $50. Quote Link to comment Share on other sites More sharing options...
Jerry Simon Posted June 13, 2012 Report Share Posted June 13, 2012 Around here in some towns you cannot use CPVC on the TPRV extension. Over the winter I renovated a home. 100% new plumbing. All the old cast iron drains were replaced with PVC and the galvanized water lines were replaced with CPVC. On the new water heater I had CPVC on the TPRV extension. When the county came in to inspect they made me replace the extension with metal. It is a real head scratcher, here is a house with ever inch of water line made of CPVC and yet the extension had to be metal. I suspect part of the reason was so they could charge me for another inspection to come back and confirm it was replaced w/ metal. $50. IL State Plbg Code specifies metal ext. pipes only. Sect 890.1230 d) 3) Quote Link to comment Share on other sites More sharing options...
Marc Posted June 14, 2012 Report Share Posted June 14, 2012 When the county came in to inspect they made me replace the extension with metal. It is a real head scratcher, here is a house with ever inch of water line made of CPVC and yet the extension had to be metal. If you read the pressure/temperature specs on the CPVC pipe, you'll see that they are lower than the same specs on the TPRV. Marc Quote Link to comment Share on other sites More sharing options...
hausdok Posted June 14, 2012 Report Share Posted June 14, 2012 There are plastic pipes manufactured specifically to be used as TPR extensions. I think all of the what-if scenarios that deal with this are silly. I bet it performs just as well as metal pipe when/if a TPR activates. ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
John Kogel Posted June 15, 2012 Report Share Posted June 15, 2012 There are plastic pipes manufactured specifically to be used as TPR extensions. I think all of the what-if scenarios that deal with this are silly. I bet it performs just as well as metal pipe when/if a TPR activates. ONE TEAM - ONE FIGHT!!! Mike From yesterday's job, tank installed by a plumber. I'd be a fool to call out all the plastic discharge pipes I see, lots of them. Click to Enlarge 20.9 KB Click to Enlarge 29.39 KB 100 degrees C is 212 F. Quote Link to comment Share on other sites More sharing options...
Greg Booth Posted June 16, 2012 Report Share Posted June 16, 2012 There are plastic pipes manufactured specifically to be used as TPR extensions. I think all of the what-if scenarios that deal with this are silly. I bet it performs just as well as metal pipe when/if a TPR activates. ONE TEAM - ONE FIGHT!!! Mike From yesterday's job, tank installed by a plumber. I'd be a fool to call out all the plastic discharge pipes I see, lots of them. Click to Enlarge 20.9?KB Click to Enlarge 29.39?KB 100 degrees C is 212 F. ...........I agree, however I would say something about the WH laying on its side[:-monkeyd.............Greg. Quote Link to comment Share on other sites More sharing options...
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