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 both the static head (vertical lift) and friction losses in the pipe system. It's a crucial parameter for selecting and sizing submersible pumps.

2. How Does the Calculator Work?

The calculator uses the TDH formula:

Where:

• \( Static\ Head \) — Vertical distance from water surface to discharge point (ft)
• \( Friction\ Loss \) — Pressure loss due to pipe friction (ft)

Explanation: The equation sums the vertical lift and the friction losses in the piping system to determine the total head the pump must overcome.

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 system damage.

4. Using the Calculator

Tips: Measure static head as vertical distance from water surface to discharge point. Calculate friction loss based on pipe size, length, flow rate, and material. Both values must be in feet.

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 both static head and friction losses in the piping system.

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

Q3: Does TDH change with flow rate?
A: Static head remains constant, but friction loss increases with higher flow rates, so TDH increases with flow.

Q4: What's a typical TDH range for submersible pumps?
A: Residential systems often range 50-200 ft, while deep well or high-pressure systems may exceed 500 ft.

Q5: Should I add a safety factor to TDH?
A: It's common to add 10-20% to calculated TDH to account for future scaling or unexpected losses.