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ANSI Class Leakage for Valves

ANSI Class Leakage for Valves

ANSI Class Leakage for Valves

(OP)
Hello,

I would like to test an 8" valve according to ANSI Class VI Leakage criteria.  We normally do a hydro and measure leakage rate.  However, I would like to use air for an upcoming job in which we have to test at vacuum.  Can anyone tell me if there is a conversion or rule of thumb for volumetric leakage rate to pressure drop?  Thanks for the help.  

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