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 static head, friction losses, and pressure head. It's a crucial parameter in 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 head if discharging under pressure (ft)

Explanation: The equation sums all components of resistance the pump must overcome to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for proper pump selection, ensuring the pump can deliver required flow against system resistance while operating at optimal efficiency.

4. Using the Calculator

Tips: Enter static head (vertical lift), friction loss (from pipe calculations), and pressure head (if applicable). All values must be in feet.

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 resistance components the pump must overcome.

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

Q3: When is pressure head needed?
A: When discharging into a pressurized system (like a boiler) or when additional pressure is required at discharge.

Q4: What are typical TDH values?
A: Residential systems might have 30-60 ft TDH, while industrial systems can exceed 300 ft depending on application.

Q5: How does TDH affect pump power requirements?
A: Higher TDH requires more pump power. Power is proportional to flow rate × TDH × fluid specific gravity.