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Old 08-04-2016, 11:55 PM   #1
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Water Heater pressure relief drain line.


I have to run a vertical 3/4" copper line from the pressure relief valve on a water heater in a second floor apt. utility closet down through the floor and into the utility closet of the 1st floor apt. I then have to maneuver around the Furnace ductwork with 90 degree elbows to get the copper line vertical again to go out of the building into a crawlspace then, make a turn with another elbow to take the pipe outside. Is there a maximum number of turns I am allowed to make as the pipe travels to the exterior? I will also have to do the same with the water pan drain line. Thanks

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Old 08-05-2016, 06:40 AM   #2
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Re: Water Heater pressure relief drain line.


Ayuh,.... The pressure relief line should go to the drip pan, then the drip pan can be plumbed outdoors,....

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Old 08-05-2016, 08:45 AM   #3
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Re: Water Heater pressure relief drain line.


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Originally Posted by Bondo View Post
Ayuh,.... The pressure relief line should go to the drip pan, then the drip pan can be plumbed outdoors,....
Not acceptable in many areas, the TPV must be plumbed to daylight.

I have never heard of a restriction on the number of elbows but the pipe must always be sloped down. It can not run uphill in any section.
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Old 08-05-2016, 01:44 PM   #4
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Re: Water Heater pressure relief drain line.


Thanks, I'll use 45's in place of 90's.


"Ayuh,.... The pressure relief line should go to the drip pan, then the drip pan can be plumbed outdoors,.... "

My code says I have to plumb drains to outside:

608.5 Drains. Relief valves located inside a building shall be provided with a drain, not smaller than the relief valve outlet, of galvanized steel, hard-drawn copper piping and fittings, CPVC, PP, or listed relief valve drain tube with fittings that will not reduce the internal bore of the pipe or tubing (straight lengths as opposed to coils) and shall extend from the valve to the outside of the building,







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Old 08-05-2016, 02:09 PM   #5
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Re: Water Heater pressure relief drain line.


Quote:
I have never heard of a restriction on the number of elbows but the pipe must always be sloped down. It can not run uphill in any section.
There isn't any code that I am aware of. However, at least one Mfg (Watts) says no more than 4 90s and the drain line should not exceed 30 ft.
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Old 08-05-2016, 06:13 PM   #6
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Re: Water Heater pressure relief drain line.


Why not just run it out the outside wall on the second floor?
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Old 08-05-2016, 06:35 PM   #7
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Re: Water Heater pressure relief drain line.


Where possible use long sweep ells.
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Old 08-06-2016, 01:20 PM   #8
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Re: Water Heater pressure relief drain line.


IF your leaving the room of the original water heater you have to have an air gap so the owner of that water heater can tell he has a problem and the T&P is dripping or blowing off.

504.6 Requirements for discharge piping. The discharge piping serving a pressure relief valve, temperature relief valve or combination thereof shall:
1.Not be directly connected to the drainage system.
2.Discharge through an air gap located in the same room as the water heater.
3.Not be smaller than the diameter of the outlet of the valve served and shall discharge full size to the air gap.
4.Serve a single relief device and shall not connect to piping serving any other relief device or equipment.
5.Discharge to the floor, to the pan serving the water heater or storage tank, to a waste receptor or to the outdoors.
6.Discharge in a manner that does not cause personal injury or structural damage.
7.Discharge to a termination point that is readily observable by the building occupants.
8.Not be trapped.
9.Be installed so as to flow by gravity.
10.Not terminate more than 6 inches (152 mm) above the floor or waste receptor.
11.Not have a threaded connection at the end of such piping.
12.Not have valves or tee fittings.

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