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 is the sum of the static head, friction head, and pressure head.

2. How Does the Calculator Work?

The calculator uses the TDH formula:

Where:

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

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's total resistance.

4. Using the Calculator

Tips: Enter static head and friction loss in feet. Include pressure head if your system requires additional pressure at the discharge point. All values must be non-negative.

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 size, length, material, flow rate, and number of fittings. Use friction loss charts or calculators.

Q3: When is pressure head needed?
A: Pressure head is required when the system needs additional pressure at discharge (e.g., for sprinklers or pressurized tanks).

Q4: What units should I use?
A: This calculator uses feet. For meters, convert all values (1 m = 3.28084 ft).

Q5: How does TDH affect pump selection?
A: Pumps are selected based on their performance curves at the required flow rate and TDH. The operating point should be near the pump's best efficiency point.