When 1 or multiple fire hydrants are opened on an municipal potable water main, the other connection points on that main experience pressure loss into their building and therefore creating a BACKSIPHONAGE condition on those connection points...not a BACKPRESSURE condition. The downstream pressure of the RP assembly would have to be greater than the inlet of the assembly for it to be a backpressure condition. The RP assembly does protect against both backsiphonage and backpressure conditions, but I just wanted to help you clarify your explanation.
When 1 or multiple fire hydrants are opened on an municipal potable water main, the other connection points on that main experience pressure loss into their building and therefore creating a BACKSIPHONAGE condition on those connection points...not a BACKPRESSURE condition. The downstream pressure of the RP assembly would have to be greater than the inlet of the assembly for it to be a backpressure condition. The RP assembly does protect against both backsiphonage and backpressure conditions, but I just wanted to help you clarify your explanation.
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