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 a critical parameter for proper pump selection and sizing in fluid systems.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

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

Explanation: TDH represents the total resistance the pump must overcome to move fluid through the system at the desired flow rate.

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. An undersized pump won't deliver the needed flow, while an oversized pump wastes energy and may cause operational issues.

4. Using the Calculator

Tips: Enter all values in feet. Static head is the vertical distance, friction loss can be calculated separately or estimated, and pressure head is only needed if there's specific pressure requirement at the discharge point.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is just the vertical distance, while dynamic head includes all resistances (friction, velocity head, pressure head).

Q2: How do I determine friction loss?
A: Friction loss depends on pipe size, length, material, flow rate, and number of fittings. Use Darcy-Weisbach or Hazen-Williams equations.

Q3: When is pressure head needed?
A: When the discharge point requires specific pressure (e.g., sprinkler systems, pressure vessels). Convert psi to feet (1 psi = 2.31 ft water).

Q4: What units should I use?
A: This calculator uses feet. For metric, convert all values to meters (1 ft = 0.3048 m).

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