Section 658-13-10 - Safety and Pressure Relief Valves13.10.1Approved Safety or Pressure Relief Valve RequiredSteam 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.
13.10.2Termination13.10.2.1 All steam safety or pressure relief valves must terminate in a manner which precludes the possibility of accidental scalding in accordance with ASME.13.10.2.2 Steam safety relief valves over two (2) inches in diameter must terminate outside of the structure in a safe location.13.10.2.3 Steam safety or pressure relief valves which terminate in the structure must terminate six (6) inches to twelve (12) inches above the floor.13.10.3Installation in Upright Vertical PositionSteam 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