1. What is Fire Pump Head Calculation?

Total Dynamic Head (TDH) is the total equivalent height that a fluid is to be pumped, taking into account friction losses in the pipe. It's a critical parameter in fire pump system design and selection.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• Static Head — Vertical distance from water surface to discharge point (ft)
• Friction Loss — Pressure loss due to friction in pipes and fittings (ft)
• Pressure Head — Additional pressure required at discharge point (ft)

Explanation: The equation sums all pressure requirements to determine the total head the pump must overcome.

3. Importance of TDH Calculation

Details: Accurate TDH calculation ensures proper pump selection, adequate water pressure for fire protection systems, and compliance with NFPA standards.

4. Using the Calculator

Tips: Enter all values in feet. Static head is always required. Pressure head can be zero if no additional pressure is needed at discharge.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and pressure head?
A: Static head is the physical elevation change, while pressure head is the additional pressure required at the discharge point.

Q2: How do I determine friction loss?
A: Friction loss depends on pipe material, diameter, length, flow rate, and fittings. Use hydraulic tables or software.

Q3: What are typical TDH values for fire pumps?
A: TDH varies widely but often ranges from 50-300 ft depending on building height and system design.

Q4: Does this calculator account for NPSH?
A: No, Net Positive Suction Head requirements should be calculated separately.

Q5: Is this suitable for sprinkler systems?
A: Yes, but ensure all NFPA 20 requirements are met for fire protection systems.