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  1. mechspng

    Vent for Steam Boiler ASME IV Relief Valve

    Does ASME IV specify a maximum allowed back pressure like ASME VIII? I would like to vent a 15 PSIG steam boiler relief valve up through the roof of the boiler room. And, I would like to verify that the vent pipe size is adequate. Pipe run will be about 40 feet with a few elbows.

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