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 — The vertical distance from the water surface to the 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 crucial for proper pump selection. An undersized pump won't deliver required flow, while an oversized pump wastes energy and may cause operational issues.

4. Using the Calculator

Tips:

• Measure static head as vertical distance from water source to discharge point
• Calculate friction loss using pipe size, length, flow rate, and material
• Include pressure head if the system requires pressure at discharge (e.g., sprinkler systems)

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and TDH?
A: Static head is just the vertical lift, while TDH includes all resistances the pump must overcome.

Q2: How do I calculate friction loss?
A: Use the Hazen-Williams equation or consult friction loss tables based on pipe diameter, length, material, and flow rate.

Q3: When is pressure head needed?
A: When the discharge point requires specific pressure (e.g., 30 psi for sprinklers = ~69 ft head).

Q4: What units should I use?
A: Consistent units are critical. This calculator uses feet for all head measurements.

Q5: Does elevation affect TDH?
A: Elevation affects static head but not TDH calculation directly. Atmospheric pressure changes may affect pump performance at high elevations.