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 loss, and pressure head. It's a crucial parameter in pump system design 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 at discharge point (ft of liquid)

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

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for proper pump selection, ensuring the pump can deliver the required flow rate against the system resistance.

4. Using the Calculator

Tips: Enter all values in feet. Static head is the vertical distance, friction loss can be calculated from pipe sizing charts, and pressure head is only needed if there's system pressure at discharge.

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 in the system.

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 software.

Q3: When is pressure head needed?
A: When pumping into a pressurized vessel or system, convert the pressure to feet of liquid (psi × 2.31/SG).

Q4: What units should I use?
A: All values must be in consistent units (feet in this calculator). For metric, convert to meters.

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