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 static head, friction losses, and any additional pressure head required. 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 — The vertical distance from the liquid surface to the discharge point (ft)
• Friction Loss — Head loss due to friction in pipes and fittings (ft)
• Pressure Head — Additional head required to overcome system pressure (ft)

Explanation: TDH represents the total work the pump must perform to move fluid through the system, accounting for elevation changes, friction losses, and any additional pressure requirements.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential 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: Enter all values in feet. Static head is the vertical distance, friction loss can be calculated separately, and pressure head is zero for open systems. All values must be positive numbers.

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 the pump must overcome (static head + friction + pressure).

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 online calculators.

Q3: When is pressure head needed?
A: Pressure head is required when pumping into pressurized systems (like boilers) or when additional pressure is needed at discharge.

Q4: What units should I use?
A: This calculator uses feet. For meters, convert or use a metric version of the calculator.

Q5: Does TDH change with flow rate?
A: Yes, friction loss increases with flow rate, so TDH rises as flow increases in most systems.