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 represents the actual work the pump must perform to move the fluid through the system.

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 (converted to ft of head)

Explanation: The equation sums all resistance components 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. 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 source to discharge
• Calculate friction loss using pipe size, length, flow rate, and material
• Include pressure head if system requires pressure at discharge (e.g., sprinkler systems)
• All values must be in feet of head (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 just the vertical elevation difference, while dynamic head includes all resistance components (static head + friction loss + pressure head).

Q2: How do I calculate friction loss?
A: Use Hazen-Williams or Darcy-Weisbach equations based on pipe material, diameter, length, and flow rate. Many online calculators are available.

Q3: When is pressure head needed?
A: When the discharge point requires pressure (e.g., sprinkler systems, pressure tanks). Convert required psi to feet (1 psi = 2.31 ft water head).

Q4: What's a typical TDH range for residential systems?
A: Typically 30-100 ft, depending on well depth, piping, and pressure requirements.

Q5: How does TDH affect pump power requirements?
A: Pump power is directly proportional to TDH. Higher TDH requires more powerful pumps for the same flow rate.