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@LittleInch : Thank you so much, for such a valuable clarification

Thanks to all, I appreciate your contributions, I'd actully assist to many hydrotest, but this is first time with such conditions ( pipe diameter & pipe lenght) we've prepared test plan & WMS, but the only pending point is about the amount of water to add for pressurisation ( after pipeline...

Gentlemen, We are planning for the hydrotest of 36" pipeline (20Km long). After pipeline filling we will pressurize the pipe. I'd like to know the relation between the added water volume and pressure raise in the pipe (i.e: how much water will we need to increase pressure by 5 or 10 bars)...