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 the static head (vertical distance) and friction losses in the system.

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 (feet)
• \( Friction\ Loss \) — Pressure loss due to friction in pipes and fittings (feet)

Explanation: TDH represents the total resistance the pump must overcome to move water through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is crucial for selecting the right pump size. An undersized pump won't deliver required flow, while an oversized pump wastes energy and may cause system damage.

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
• For complex systems, consider additional factors like velocity head

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 resistance (static head + friction losses).

Q2: How do I determine friction loss?
A: Use friction loss charts or calculators based on pipe diameter, length, material, and flow rate.

Q3: What are typical TDH values for residential systems?
A: Typically 30-100 feet, depending on house height, pipe layout, and flow requirements.

Q4: Does TDH change with flow rate?
A: Yes, friction loss increases with flow rate, so TDH rises as flow increases.

Q5: Should I add a safety factor to TDH?
A: It's common to add 10-20% to account for aging pipes or future flow increases.