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Latexman, your answer is more confusing than my question. This PVRV is to be designed for Water supply header and to be protected under drain out condition. Ihave water flow rate and other conditions but don't know how to determine set pressure (vacuum side).Pipe specs say pipe can withstand...

Hi, I am sizing one of the PVRV on supply line. I got equations and charts to be utilized for calculating inbreathing and outbreathing flow for the system (from API 2000). But how to determine set pressure (vacuum) during inbreathing condition. any inputs?? Thanks

Based on concentration, you can determine it by liquid chromatograph, not sure cation or anion...

planedr , Thnaks, I will write a letter with lot information meanwhile its better to start preparing for exams appy