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 friction losses in the pipe. It's the sum of the static head, friction head, and pressure head (if applicable).

2. How Does the Calculator Work?

The calculator uses the TDH formula:

Where:

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

Explanation: The equation accounts for all resistance the pump must overcome to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is crucial for proper pump selection and ensuring the pump can deliver the required flow rate against the system resistance.

4. Using the Calculator

Tips: Enter static head and friction loss in feet. Pressure head is optional. All values must be positive numbers.

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 friction losses and pressure requirements.

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

Q3: When is pressure head needed?
A: Pressure head is required when the discharge point needs specific pressure (e.g., sprinkler systems or pressurized tanks).

Q4: What units should I use?
A: The calculator uses feet for all values. Convert from PSI to feet by multiplying by 2.31 (for water).

Q5: How does TDH affect pump selection?
A: The pump's performance curve must show it can deliver the required flow rate at your calculated TDH.