1. What is Total Dynamic Head (TDH)?

Total Dynamic Head (TDH) is the total equivalent height that a fluid needs to be pumped, accounting for static head, friction loss, and pressure head. It's a crucial parameter for proper pump sizing and selection.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

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

Explanation: TDH represents the total work the pump must overcome to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for selecting a properly sized pump that can deliver the required flow rate against the system's total resistance.

4. Using the Calculator

Tips: Enter all values in feet. Static head is the vertical distance, friction loss can be calculated separately, and pressure head is optional (use 0 if not applicable).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and TDH?
A: Static head is just the vertical component, while TDH includes all resistances the pump must overcome.

Q2: How do I determine friction loss?
A: Friction loss depends on pipe size, length, material, flow rate, and number of fittings. Use hydraulic tables 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 of head. For PSI, convert using: 1 psi = 2.31 ft of water head.

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