3.8.1.9.2 Static Pressure. The pressure that exists at a given point under normal distribution system conditions measured ... We have a project with an electric pump and when combined with the current water supply the churn pressure is 178 psi. A nationally known engineering firm wants us to install PRV's on the lowest level of the building because of the 3 psi. Our position is that the pressure only exists at churn and that is similar to an overnight pressure surge in a municipal water system. The over pressure will be compensated for by the pressure relief valves once the pump stops. Are we being overly loose with our interpretation of "normal" or is the engineering firm correct? Ron F
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