Water Heater Pressure Relief Valve Discharge Pipe Code California

Relief valve drains shall not terminate in a building s crawl space.

Water heater pressure relief valve discharge pipe code california. The california water heater code is part of a larger statewide california plumbing code and has several very specific restrictions. Surface area flow rate surface area flow rate surface area flow rate. Unlike the expansion tank which is intended to protect the piping system from pressure the tprv protects the water heater tank from experiencing. Asme code paragraphs u 68 and u 69 tanks shall have safety valve capacity sufficient to prevent pressure in the tank from exceeding 135 percent of the allowable working pressure of the tank.

A trapped tpr dischage pipe is a common defect when a replacement water heater s tpr valve is lower than the original one and the installer connects to the exisitng discharge piping at the wall. I always use the 18 rule with copper pipe before transitioning to pex pipe. Its proper functioning is the difference between a nice hot shower and an explosion. All safety relief valves required by this order shall be asme rated and stamped.

At a minimum any water heater shall be secured in accordance with the california plumbing code or modifications made thereto by a city county or city and county pursuant to section 17958 5. Not be directly connected to the drainage system. The discharge piping serving a temperature relief valve pressure relief valve or combination of both shall have no valves obstructions or means of isolation and be provided with the following. No part of such drain pipe shall be trapped or subject to freezing.

The valve shall be drained to the exterior terminate toward the ground maintaining between 6 and 24 of clearance from the ground and point downward. T p valve the temperature and pressure relief valve is an important safety device which goes off when your tank exceeds 210. The discharge piping serving a pressure relief valve temperature relief valve or combination valve shall. Not be smaller than the diameter of the outlet of the valve served and shall discharge full size to the air gap.

Discharge through an air gap located in the same room as the water heater. 2015 upc chapter 6 water supply and distribution page 105 section 608 5 discharge piping. 8 termination of the tpr drain pipe cannot be more than 6 inches or less than two pipe diameters above the floor ground or waster receptor. The terminal end of the drain pipe shall not be threaded 2010 cpc 608 5 discharge from a relief valve into a water heater pan shall be prohibited.

Which reads as follows.