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Expansion Tank sizing made easy

Disclaimer:

This calculator is provided for general guidance and informational purposes only. Results are indicative and based on simplified assumptions. FlowQuip accepts no liability for incorrect sizing, system design, or application. Final selection should always be verified by a qualified professional.

Expansion Tank Size Calculator

Enter the starting (minimum) and maximum system pressures and the required drawdown volume. The calculator estimates an optimal pre-charge, acceptance factor, minimum theoretical tank size, and a recommended nominal size with 20% safety margin.

Recommended optimal pre-charge -
Acceptance factor -
Minimum theoretical tank size -
Recommended nominal size (+20%)
Rounded catalogue size -
Calculation basis:
Pre-charge (recommended) = Starting pressure - offset
Acceptance factor = (Pmax abs - Pmin abs) / (Pmax abs - P0 abs)
Minimum theoretical tank size = Required drawdown / Acceptance factor
Recommended nominal size = Minimum theoretical tank size × 1.20


Expansion tanks

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