How do I pick the correct air precharge pressure for my hydro-pneumatic bladder tank?
The tank should be set approximately 2 PSI below the lowest pressure switch setting (pump cut-in pressure). For example, the air charge pressure should be set at 28 PSI for a pressure switch setting of 30 PSI minimum and 50 PSI maximum. For surge applications, the tank should be set approximately 10% to 20% below the system pressure.
