Code Ref for TPR valve piping?

[Dan Bowers, CMI]

Hank - Screw the code. Read the PVC pipe - rated for up to 73 degrees.

[William R. DeVries, CMHI]

UPC 608.5 states, must drain by gravity-not uphill or trapped, no kinks or restrictions in pipe

[Justin Watts]

William,
Thanks.. then that answers that question.. It would make it a lot easier on all of us if the Water Heater manufacturers installed the TP valve on the side of tank instead of on top for the discharge pipe. And ofcourse if plumbers watched for this as well...

[Scott Schultz]

Did an inspection today in which the TP pipe was made of cpvc and was labeled 100psi at 180F. I know this is ok for water distribution piping but is it ok for a t&p pipe. The t&p valve on the water heater said 150psi at 215F.

[Michael Larson]

Originally Posted by Scott Schultz

Did an inspection today in which the TP pipe was made of cpvc and was labeled 100psi at 180F. I know this is ok for water distribution piping but is it ok for a t&p pipe. The t&p valve on the water heater said 150psi at 215F.

It's OK The discharge pipe is open to atmosphere so it's not under much pressure.

[Scott Schultz]

thanks mike

[jlybolt]

Ok heres one. If you have two water heaters with common TPR drain line (like I usually see on four plex apartmets) what is the mininum size of the drain line?

[Brian E. Kelly]

Piping with 1 1/16 ID. or there abouts.

[William R. DeVries, CMHI]

UPC 608.5 states

Drain size must be at least same size as outlet of valve

[jlybolt]

Yes the code does say that, but there is a provision to that somewhere. I still am looking for it.

[Dan Bowers, CMI]

Before you start quoting UPC or any other code, verify what code and what version that area uses.

[klott]

Originally Posted by wdevries

TPPRV Drain Piping Max of 4 90deg elbows & max 30ft
When the water heater is in a basement or below grade, it may not be possible to arrange for a gravity drain of the TPRV. A Watts 210 valve can be installed. The temperture-sensing bulb of the valve goes in the upper portion of the tank, and the gas piping runs through the valve. The Watts 210 shuts off the gas it the temperture is in excessive. In addition a seperate water pressure relif valve must be installed in the piping and must drain as shown

Not sure if this answers your question but I thought I'd give it a whirl as i get so many answers from here
Billy

It can have a gravity drain if it is below grade! Terminate it within 6" of floor.

[William R. DeVries, CMHI]

Ken;
yes it can but that was a quote from Code Check verbatim.. and in my area most basement's have the TPR off the side with a cpvc pipe the terminates 6" off the ground directly beside the tank, some even happen to fall with luck very close to the sump holw and terminate over the hole with piping.
I have not done a tankless as of yet so I'm looking forward to seeing on in action, there not very popular here yet and I have no gas at my home area so I am stuck with Electric or oil.

[klott]

Originally Posted by Scott Schultz

Did an inspection today in which the TP pipe was made of cpvc and was labeled 100psi at 180F. I know this is ok for water distribution piping but is it ok for a t&p pipe. The t&p valve on the water heater said 150psi at 215F.

It will be fine, it does not have to hold pressure, just drain.

[jlybolt]

Sorry Dan, didnt mean to confuse you or anything like that. I will have the code word per word available for you the next time.