TPR valve

[rdykmann (Robert Dykmann)]

Can you have 5 bends or elbows in the extension pipe to the drain?

[gromicko (Nick Gromicko, CMI)]

Yes. But it should be as straight as possible. Read: http://www.nachi.org/tpr-valves-discharge-piping.htm

[wsiegel (William E. Siegel)]

“As staight as possible” does not meet a standard. The manufactures recomendations and installation instructions are what is to be followed. If they do not recommend it, you do not do it. If you do, you most likely have voided the warranty if something goes wrong.

[gromicko (Nick Gromicko, CMI)]

wsiegel writes:

“As staight as possible” does not meet a standard. The manufactures recomendations and installation instructions are what is to be followed.

Every manufacturer’s installation instructions that I’ve ever seen mentions something such as

Excessive length, over 30 feet, or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve.

All instructions include something that in essence recommends that the discharge line be “as straight as possible” just as InterNACHI recommends. None of these manufacturer’s instructions recommend anything that conflicts with InterNACHI’s “as straight as possible” recommendation.

See: TPR Valves and Discharge Piping - InterNACHI®

[kramm (Kenneth A. Ramm)]

@gromicko

Every manufacturer’s installation instructions that I’ve ever seen mentions something such as

Excessive length, over 30 feet, or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve.

Not this company.
http://www.americanwaterheater.com/media/23796/6500260.pdf

[mclark2 (Michael Clark, CMI)]

Four 90’s equals one plug!!

[wwilson3 (Wayne Wilson, TN 439)]

I use the more than 4 90’s Always write it up

[frotte (Frank Rotte)]

What do you think of this?

[frotte (Frank Rotte)]

Closer shot of the drain. Notice how it’s going to shoot past the drain.

[jjonas (Jeffrey Jonas)]

@frotte

What do you think of this?

Shoulda extended the first horiz then to the vert to eliminate the lower 90 and the improper air gap…

[wwilson3 (Wayne Wilson, TN 439)]

That was a good one Frank lol

[frotte (Frank Rotte)]

@jjonas

Shoulda extended the first horiz then to the vert to eliminate the lower 90 and the improper air gap…

That’s too simple.

[mclark2 (Michael Clark, CMI)]

It looks like it used to go in that hole in the white pipe.

[ccurrins (Christopher Currins, CMI)]

@mclark2

It looks like it used to go in that hole in the white pipe.

And the inspector recommended corrective action.

[cbottger (Charley L. Bottger)]

@mclark2

It looks like it used to go in that hole in the white pipe.

If they don’t go to the floor I write them up That schedule 40 PVC drain is only rated for 180 degrees and will probably melt with 215+ water being discharged from a relief valve;-)