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Section P-812 Temperature and Pressure Relief Valves
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An approved pressure relief valve shall be installed on all equipment used for heating or storing hot water and which forms part of a water supply system. The rate of discharge of such valve shall limit the pressure rise in the water supply system to 10% above the pressure at which the valve is set to open. Pressure relief valves shall be of the spring-loaded type with a pull rod and lever handle, or shall be of an equivalent approved type which will permit the manual operation and testing of the valve. Pressure relief valves shall be installed in the cold water supply to the heater or storage tank and adjacent to such heater or storage tank. In addition, an approved backflow preventer shall be installed on all equipment which is connected to the potable water supply when such equipment is used for any purpose other than supplying potable water to approved fixtures or as required by the Department.
An approved temperature relief valve shall be installed on all equipment used for heating or storing hot water and which forms part of a water supply system. When the temperature of the water within the vessel to which such relief valve is connected reaches 210oF, the valve shall automatically discharge sufficient hot water to prevent any further rise in the temperature. Each temperature relief valve shall be rated in terms of the maximum permissible hourly BTU input which the valve can safely relieve, and such rating shall be plainly stamped, etched, or cast on the valve or on a permanent nameplate securely attached to the valve. Temperature relief valves shall be installed in the hot water connection to the heater or storage tank in such a manner that the stem of the temperature-sensing element will project at least one inch into the tank.
Copper tanks shall be provided with vacuum relief valves. Vacuum relief valves shall be placed at or as close as possible to the tanks, which they are intended to protect.
A combination pressure and temperature relief valve of an approved type shall be accepted in lieu of separate valves, provided it meets the requirements for separate valves. The combined relief valve shall be located as a temperature relief valve and shall be installed in the hot water connection to the heater or storage tank in such a manner that the stem of the temperature-sensing element will project at least one inch into the tank.
No pressure relief valve or temperature relief valve shall be installed after the effective date of this code, unless it is a type which has been approved by the Department and is installed in conformity with the conditions of approval. Relief valves which meet the requirements of this code shall be approved by the Department without additional tests, provided that they have been tested and labeled by an approved agency and conform to ANSI Z21.22-86.
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