Water and Wastewater Terms Beginning O
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operating pressure differential
The operating pressure range for a hydropneumatic system. For example, when the pressure drops below 40 pounds per square inch (psi) in a system designed to operate between 40 psi and 60 psi, the pump will come on and stay on until the pressure builds up to 60 psi. When the pressure reaches 60 psi the pump will shut off. The operating pressure differential in this example is 20 psi.
