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 for proper pump selection and system design.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

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

Explanation: TDH represents the total resistance 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 flow.

4. Using the Calculator

Tips: Enter all values in feet. Static head is the vertical lift, friction loss includes pipe and fitting losses, and pressure head is any additional pressure required at discharge (set to 0 if not applicable).

5. Frequently Asked Questions (FAQ)

Q1: How do I determine friction loss?
A: Friction loss can be calculated using pipe size, length, flow rate, and pipe material characteristics, or obtained from pump system design software.

Q2: What's the difference between static head and TDH?
A: Static head is just the vertical component, while TDH includes all resistances in the system.

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

Q4: 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.

Q5: What units should I use?
A: This calculator uses feet. For meters, convert all values (1 m = 3.28084 ft).