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Did You Know: PSV Isolation on Air Receivers

Posted by Brandon Ring on Jan 14, 2020 10:26:07 AM
Brandon Ring
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Did you know, OSHA does not allow block valves on the inlet of relief valves installed on air receivers in compressed air systems?

OSHA CFR 1910.169(b)(3)(ii) states, “No valve of any type shall be placed between the air receiver and its safety valve or valves.”

OSHA Air Receivers


However, installation of a block valve on the inlet of a relief valve can be considered acceptable for facilities located in states that enforce ASME boiler / pressure vessel code as the law (as indicated in the OSHA standards interpretation below).

OSHA Response

 

 

Topics: Did You Know?, Pressure Relief Valves, Detailed Engineering, OSHA, PRV, Relief System Design, Relief Header, Set Pressure, Exit Pipe Fitting

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