NAC445A.6561. “Backpressure” defined.

Latest version.

“Backpressure” means an elevation in the downstream pressure of a piping system above the supply pressure which:

1. Is caused by pumping, air pressure, steam or the elevation of piping; and

2. Could cause a reversal in the normal direction of flow at a particular point.

(Added to NAC by Bd. of Health, eff. 2-20-97)

                    
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