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 total energy required to move fluid through a piping system.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• Static Head — 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 feet of head)

Explanation: The equation sums all resistance components that 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 all values in feet. Static head is the vertical distance. Friction loss can be calculated separately using pipe sizing charts. Pressure head is optional (use when discharge pressure is specified).

5. Frequently Asked Questions (FAQ)

Q1: How do I determine friction loss?
A: Friction loss depends on pipe size, length, material, flow rate, and fittings. Use hydraulic tables or online calculators for accurate values.

Q2: What's the difference between static head and TDH?
A: Static head is just the vertical component, while TDH includes all resistances (friction, pressure, velocity head).

Q3: When is pressure head needed?
A: When the discharge goes to a pressurized system (like a boiler or pressurized tank), convert PSI to feet (1 PSI = 2.31 ft water head).

Q4: How does TDH affect pump selection?
A: Pumps are selected based on their performance curves at your required flow rate and calculated TDH.

Q5: What about velocity head?
A: Velocity head (v²/2g) is often negligible in most systems and is typically omitted unless dealing with high-velocity applications.