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Following API, you use a rated flow to work out inlet losses to PSV; ie rated flow = required flow times de-rating factor (which is = actual orifice A / required A). Following ISO 4126, you have to use instead “actual flow”/0.9. Actual flow is defined as capacity calculated with certified...

Following API, you use a rated flow to work out inlet losses to PSV; ie rated flow = required flow times de-rating factor (which is = actual orifice A / required A), required being = design (from relief load Calc). Following ISO 4126, you have to use instead “actual flow”/0.9. Actual flow is...