Water Heater Pressure Relief Valve Drain Pipe Code

The tpr valve discharge piping serving a pressure relief valve temperature relief valve or combination valve shall.

Water heater pressure relief valve drain pipe code. P2804 6 1 requirements for tpr temperature pressure relief valve discharge pipe. 1 equal to the size of the valve outlet and shall discharge full size to the flood level of the area. I think the concern about the pipe size reduction occurs with pex pipe. The tpr valve will activate if either water temperature measured in degrees fahrenheit or pressure measured in pounds per square inch psi exceed safe levels.

4 termination of the discharge piping can be to any of the following. All hot water distribution pipe and tubing shall have a minimum pressure rating of 100 psi at 180 f 689 kpa at 82 c. Its proper functioning is the difference between a nice hot shower and an explosion. Go to our blog post when is a water heater drain pan required.

Irc p2904 5 water distribution pipe. Building codes require temperature pressure relief tpr valves with discharge pipes on all new water heater installations. Water distribution piping within dwelling units shall conform to nsf 61 and shall conform to one of the standards listed in table p2904 5. The pressure relief valve exit is threaded and the 7 8 inner diameter is presumed that a threaded fitting will reduce the inner bore to 3 4.

For more on this. Drain pan while always a good idea. Discharge through an air gap located in the same room as the water heater. The ontario building code relief valves 7 6 1 12.

The valve should be connected to a discharge pipe also called a drain line that runs down the length of the water heater tank. This copper discharge tube ends about 2 inches above the floor. The california water heater code is part of a larger statewide california plumbing code and has several very specific restrictions. Unlike the expansion tank which is intended to protect the piping system from pressure the tprv protects the water heater tank from experiencing more pressure than it can handle.

T p valve the temperature and pressure relief valve is an important safety device which goes off when your tank exceeds 210 degrees fahrenheit or 150 psi. In the example below an upper pressure relief valve drain not visible behind vent connector has been tied into the drain for the lower one. Not be directly connected to the drainage system. If the pressure in the tank exceeds 150 psi or the temperature exceeds 210 degrees fahrenheit the tpr valve opens to release the pressure.

Pan serving the water heater. Relief valve drains shall comply with section p2904 5 or asme a112 4 1.