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 friction losses in the pipe. It is the sum of the static head, friction head, and pressure head.

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 (ft)

Explanation: The equation accounts for all resistance the pump must overcome to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is crucial for proper pump selection and system design. An undersized pump won't deliver required flow, while an oversized pump wastes energy and may cause operational issues.

4. Using the Calculator

Tips: Enter static head (vertical lift), friction loss (from pipe calculations), and any additional pressure head required. 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 distance, while TDH includes all resistances (friction, pressure, velocity head).

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

Q3: When is pressure head needed?
A: When the discharge point requires pressure (like sprinkler systems) beyond just reaching the elevation.

Q4: What units should be used?
A: The calculator uses feet of head. For metric, convert meters to feet (1 m = 3.28084 ft).

Q5: Does this account for velocity head?
A: Velocity head is typically small and often omitted, but can be added to the pressure head if significant.