1. What is Total Dynamic Head?

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 represents the actual workload on the pump and is crucial for proper pump selection.

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 pipe friction (ft)
• Pressure Head — Additional pressure required at discharge (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 selecting the right pump size, ensuring efficient operation, and preventing pump failure or excessive energy consumption.

4. Using the Calculator

Tips: Enter static head and friction loss in feet (required). Include pressure head if your system requires specific discharge pressure. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and TDH?
A: Static head is just the vertical lift, while TDH includes all resistance components in the system.

Q2: How do I determine friction loss?
A: Friction loss depends on pipe size, length, material, flow rate, and fluid viscosity. Use friction loss charts or calculators.

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

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

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.