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NFPA 20 2016 states under section 4.7.7.2 that relief valves are not to be used for maximum pressure (backed up by A.4.7.7) but 4.19.1.1 says you can use it to protect diesel pumps from overspeed and by A.4.7.7.2 for downstream equipment. My question is c

Question asked by Michael McPhail on May 31, 2017

NFPA 20 2016 states under section 4.7.7.2 that relief valves are not to be used for maximum pressure (backed up by A.4.7.7) but 4.19.1.1 says you can use it to protect diesel pumps from overspeed and by A.4.7.7.2 for downstream equipment. My question is can I use the relief valve for the diesel pump as a downstream protection device or am I required to install a second pressure control valve with forward pressure protection against the deluge piping

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