Section R20-5-413. Safety and Safety Relief Valves

A.      A valve shall not be placed between a safety valve or a safety relief valve and installed on a boiler or lined hot water heater, or between a safety valve or a safety relief valve and the dis- charge pipe attached to the boiler or lined hot water heater.

B.       When a power boiler is supplied with feed-water directly from a water main without the use of a feeding apparatus, safety valves shall not be set at a pressure greater than 94% of the lowest pressure obtained in the water main feeding the boiler;

C.      Safety valves, safety relief valves and relief valves shall con- form to the requirements of the 2007 ASME Boiler and Pres- sure Vessel Code, Section I, IV or VIII, and addenda as of January 1, 2008, incorporated by reference as applicable. This incorporation does not include any later amendments or edi- tions of the incorporated material. A copy of this referenced material is available for review at the Industrial Commission of Arizona, 800 W. Washington Street, Phoenix, AZ and may be obtained from the ASME, Three Park Avenue, New York, NY 10016-5990 or at http://www.asme.org/.

Historical Note

Repealed effective April 12, 1979 (Supp. 79-2). New

Section adopted effective April 9, 1992 (Supp. 92-2). R20-5-413 recodified from R4-13-413 (Supp. 95-1). Amended effective October 9, 1998 (Supp. 98-4). Amended by final rulemaking at 15 A.A.R. 1496, effec- tive August 18, 2009 (Supp. 09-3).