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 the sum of static head, friction head, and pressure head (if applicable).

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 work the pump must perform to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for proper pump selection and ensuring the pump can provide sufficient pressure to overcome system resistance and elevation changes.

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: 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 online calculators.

Q2: What if I have pressure in PSI instead of feet?
A: Convert PSI to feet by multiplying by 2.31 (1 PSI = 2.31 ft of water head).

Q3: Does TDH change with flow rate?
A: Yes, friction loss increases with flow rate, so TDH increases as flow rate increases.

Q4: What's a typical TDH range for residential systems?
A: Typically 30-100 ft, depending on house height, distance, and fixtures.

Q5: How does TDH relate to pump curves?
A: The pump must be selected so its performance curve meets or exceeds your system's TDH at the desired flow rate.