02-658 C.M.R. ch. 13, § 10 - Safety and Pressure Relief Valves

Current through 2022-14, April 6, 2022

13.10.1 Approved Safety or Pressure Relief Valve Required

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.

13.10.2 Proper Termination Required

All steam safety or pressure relief valves must terminate in a manner which precludes the possibility of accidental scalding in accordance with ASME.

13.10.3 Location

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.

13.10.4 Installation in Upright Vertical Position

Steam safety and pressure relief valves on boilers must be installed with the spindle in the upright vertical position.


02-658 C.M.R. ch. 13, § 10

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