1. What is Total Dynamic Head?

Total Dynamic Head (TDH) is the total equivalent height that a fluid needs to be pumped, accounting for static lift, friction losses, and pressure differences. It's a crucial parameter in pump selection and system design.

2. How Does the Calculator Work?

The calculator uses the fundamental pump head equation:

Where:

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

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 selecting the right pump size, ensuring proper system operation, and avoiding energy waste or insufficient performance.

4. Using the Calculator

Tips: Enter all values in meters. For pressure head, convert pressure (bar) to meters by multiplying by 10.2 (1 bar ≈ 10.2 m water head).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is the vertical lift alone, while dynamic head includes all resistances (friction, velocity head, pressure).

Q2: How do I calculate friction loss?
A: Use Darcy-Weisbach or Hazen-Williams equations considering pipe length, diameter, material, and flow rate.

Q3: When is pressure head needed?
A: When the discharge point requires pressure (e.g., sprinkler systems, pressure vessels).

Q4: What units should I use?
A: The calculator uses meters (UK standard), but you can convert from feet (1 ft = 0.3048 m).

Q5: How does TDH affect pump selection?
A: The pump's performance curve must provide required flow rate at the calculated TDH.