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 vertical lift, friction losses, and pressure requirements. 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 liquid surface to discharge point (ft)
• \( Friction\ Loss \) — Head loss due to pipe friction (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 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.

4. Using the Calculator

Tips: Enter static head (vertical lift), friction losses, and any additional pressure head required. All values must be in feet (convert psi to feet by multiplying by 2.31).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is the vertical distance only, while dynamic head includes friction losses and pressure requirements.

Q2: How do I calculate friction loss?
A: Friction loss depends on pipe size, length, material, flow rate, and fluid properties. Use hydraulic tables or calculators.

Q3: When is pressure head needed?
A: When the system requires pressure at discharge (e.g., sprinkler systems, pressure vessels).

Q4: What's a typical TDH range?
A: Varies widely by application - from 20 ft for simple water transfer to 1000+ ft for high-pressure systems.

Q5: How does TDH affect pump selection?
A: The pump's performance curve must show adequate flow at your calculated TDH. Operating at wrong TDH reduces efficiency.