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  1. Dale00

    Definintion of "open to atmosphere"

    We have fire protection sprinkler systems on our coolant circulation pumps. Basically the sub-system has a 3” piping supply (no orifices) with 8 Nozzles. The pressure before the isolation valve is 1100 kPa (abs) with the fire pumps running, while the pressure at the nozzle would be about 1000...

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