The tpr extension on the home I just inspected went through the floor and terminated in the crawlspace. If it starts discharging, the homeowner will never know because it is discharging into the crawlspace. Do I write this up?
**504.6 Requirements for discharge piping.
piping serving a pressure relief valve, temperature relief valve
or combination thereof shall:
- Not be directly connected to the drainage system.
- Discharge through an air gap located in the same room
as the water heater.
- Not be smaller than the diameter of the outlet of the
valve served and shall discharge full size to the air gap.
- Serve a single relief device and shall not connect to piping
serving any other relief device or equipment.
- Discharge to the floor, to an indirect waste receptor or
to the outdoors. Where discharging to the outdoors in
areas subject to freezing, discharge piping shall be first
piped to an indirect waste receptor through an air gap
located in a conditioned area.
- Discharge in a manner that does not cause personal
injury or structural damage.
- Discharge to a termination point that is readily observable
by the building occupants.
- Not be trapped.
- Be installed so as to flow by gravity.
- Not terminate more than 6 inches (152 mm) above the
floor or waste receptor.
- Not have a threaded connection at the end of such piping.
#7 says it all.
Here’s what I say:
“The discharge pipe from the pressure relief valve discharges into the crawl space, where any leaks would not be noticed. It should be plumbed to a conspicuous exterior location and terminate no more than twenty-four inches above grade and no closer than six inches to it, or it should discharge to a concrete floor in a conspicuous area where no damage would result.”