Water Heater Pressure ValveAuthor: Pacific Northwest Inspections Group, LLC Date: 19-Nov-2013. Category: Plumbing Add to Favorites
State of Washington Hot Water Heater TP Valve Requirements
608.5 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, or listed relief valve drain tube with fittings which 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 with the end of the pipe not
more than two (2) feet (610 mm) nor less than six (6) inches (152 mm) above the ground or the flood level of the area receiving the discharge
and pointing downward. Flex line is not permitted for use on TP lines.
Such drains may terminate at other approved locations. No part of such drain pipe shall be trapped or subject to freezing. The terminal end of the drain pipe shall not be threaded.
Exception: Replacement water heating equipment shall only be required to provide a drain pointing downward from the relief valve to extend between two feet (610 mm) and six inches (152 mm) from the floor. No additional floor drain need be provided.