To me, it makes more sense to locate a backflow on the suction side of a pump. However, I have recently run across a facility with the backflow downstream of the pump (discharge side).
The main fire pump controller is connected between the the first check valve and the backflow preventer.
The jockey pump is connected after the backflow preventer.
Here's the problem: when the first check valve fails, the main fire pump continuously starts & stops because the pressure is bleeding off they the relief valve while the jockey pump remains idle.
Is this an acceptable scenario?
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