1. What is Total Dynamic Head?

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 simple TDH formula:

Where:

• \( TDH \) — Total Dynamic Head (ft)
• \( \text{Static Head} \) — Vertical distance from water surface to discharge point (ft)
• \( \text{Friction Loss} \) — Head loss due to pipe friction (ft)

Explanation: This calculation determines the total head that the pump must overcome to move water through the system.

3. Importance of TDH Calculation

Details: Proper TDH calculation is essential for selecting the right pump. 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. Friction loss can be calculated separately or obtained from pipe friction charts based on flow rate, pipe size, and material.

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 both static head and friction losses in pipes and fittings.

Q2: How do I determine friction loss?
A: Friction loss depends on flow rate, pipe diameter, length, material, and number of fittings. Use friction loss tables or calculators.

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 are typical TDH values for residential wells?
A: Typically 100-300 ft, depending on well depth, water level, and piping system.

Q5: Why is TDH important for pump selection?
A: Pumps are rated for specific flow rates at specific TDH values. The operating point must match the pump's performance curve.