02-658 C.M.R. ch. 13, § 10 - Safety and Pressure Relief Valves
Current through 2022-14, April 6, 2022
Steam and hot water boilers must be equipped with listed or approved steam safety or pressure relief valves that conform to ASME requirements. A shut-off valve shall not be placed between the relief valve and the boiler or on discharge pipes between such valves and the atmosphere.
All steam safety or pressure relief valves must terminate in a manner which precludes the possibility of accidental scalding in accordance with ASME.
Steam safety relief valves over 2 inches in diameter must terminate outside of the structure in a safe location. Steam safety or pressure relief valves which terminate in the structure must terminate 6 inches to 12 inches above the floor.
Steam safety and pressure relief valves on boilers must be installed with the spindle in the upright vertical position.
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