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PVC drain leg

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Wyckoff, NJ
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[#1] Posted: 06/13/2012 - 10:19:03 AM
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Is this pvc allowed as a drain pipe on a water heater TPRV?
Labeled: Schedule 40 PVC ASTM D-1785


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PVC drain leg
[#2] Posted: 06/13/2012 - 12:43:54 PM
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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

Bruce Ramsey
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PVC drain leg
[#3] Posted: 06/13/2012 - 4:51:09 PM
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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.

Mark A. Perry
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PVC drain leg
[#4] Posted: 06/13/2012 - 4:54:29 PM
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Quote: Originally posted by Mark P

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)

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PVC drain leg
[#5] Posted: 06/13/2012 - 5:55:42 PM
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Quote: Originally posted by Mark P

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

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PVC drain leg
[#6] Posted: 06/13/2012 - 8:41:37 PM
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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

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PVC drain leg
[#7] Posted: 06/15/2012 - 12:18:55 PM
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Quote: Originally posted by hausdok

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.


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100 degrees C is 212 F.

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PVC drain leg
[#8] Posted: 06/15/2012 - 5:17:47 PM
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Quote: Originally posted by John Kogel

Quote: Originally posted by hausdok

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.


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100 degrees C is 212 F.



...........I agree, however I would say something about the WH laying on its side.............Greg.

   
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