Ordinance 3838 - Laserfiche WebLink

a • 1 (b) Excessive water pressure. Where local water pressure is in excess of sixty-five (65) pounds per 2 square inch, an approved type pressure regulator preceded by an adequate strainer shall be installed 3 and the pressure reduced to sixty-five (65) pounds per square inch or less . Each such regulator and 4 trainer shall be accessibly located and shall have the strainer readily accessible for cleaning without 5 removing the regulator or strainer body or disconnect- ing the supply piping. All pipe size determinations 6 shall be based on eighty (80) per cent of the reduced pressure. 7 All equipment for heating and storage of hot water for 8 domestic or commercial purposes, when installed, repaired, replaced, relocated or re-connected, shall 9 be equipped with acceptable emergency protective devices to prevent excessive pressure and excessive temperature 10 as hereinafter described. These emergency devices shall be of the following classifications: 11 A combined temperature and pressure relief valve. 12 A separate pressure and a separate temperature 13 relief valve. 14 A temperature relief valve shall have the capacity to prevent water in the heater from exceeding 210° maximum 15 temperature. It shall be tested and rated by an approved and qualified testing laboratory and certified 16 to comply fully with the provisions of the American Standards Association ASA Z21 .22 - 1958. 17 A pressure relief valve shall have a relieving capacity 18 capable of preventing a pressure rise in excess of 10% of the set pressure. It shall be set to start opening 19 at a pressure not exceeding the rated working pressure of the tank or heater. It shall be tested by an 20 approved and qualified testing laboratory and certified to comply fully with the provisions of the American 21 Standards Association Standard ASA Z21.22 - 1958 and when required shall comply also with the ASME Low 22 Pressure Heating Boiler Code for hot water supply boiler. 23 Combined temperature and pressure relief valves shall comply with the requirements as outlined above for 24 both temperature relief valves and pressure relief valves . 25 Temperature Relief Valves shall be installed either 26 directly in the tank providing a tapping is available, not more than six (6) inches down from the top of the 27 tank, or in the hot water outlet pipe. The valve shall be of such design and so installed that the end of 28 the temperature sensing element shall be immersed in the hottest water within the upper six (6) inches of 29 the tank. 30 Pressure Relief Valves may be installed in either the hot or cold line as indicated by local conditions . When 31 an ASME pressure-only relief valve is required, it shall be installed in compliance with the requirements of 32 the ASME Code.