1. What is Total Dynamic Head (TDH)?

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

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• Static Head — The vertical distance between the liquid level and the discharge point (ft)
• Friction Loss — Head loss due to friction in pipes and fittings (ft)
• Pressure Head — Additional head required at the discharge point (ft)

Explanation: The equation sums all resistance components that the pump must overcome to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for proper pump selection, ensuring the pump can provide sufficient pressure to overcome system resistance and deliver the required flow rate.

4. Using the Calculator

Tips: Enter all values in feet. Static head is always required. If there's no pressure requirement at discharge (open system), leave pressure head as 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is the vertical distance only, while dynamic head includes all resistances (friction, pressure, etc.) the pump must overcome.

Q2: How do I determine friction loss?
A: Friction loss depends on pipe size, length, material, flow rate, and number of fittings. Use hydraulic tables or software for accurate calculations.

Q3: When is pressure head needed?
A: Pressure head is required when the discharge point has a pressure requirement (e.g., pressurized tank, spray nozzle).

Q4: What units should I use?
A: The calculator uses feet (ft) for all head components. Convert from PSI if needed (1 PSI = 2.31 ft water head).

Q5: How does TDH affect pump selection?
A: The pump's performance curve must show it can deliver the required flow rate at the calculated TDH. Operating outside this range reduces efficiency.