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Negative Pressure

Hello, as per my attached model, i have already done network for four deep well pumps going through a common pipeline to an elevated tank. i make the network in watercad and i placed every air valve in the network, but i found a huge number of negative pressure warnings. i tried to use PSV or orifice between pipes to eliminate the negative pressure but i failed. i want to use that model to select each pump head at a fixed well flow rate of 36 l/s . i need help please. thanksProject.zip

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