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:

• \( Static\ Head \) — Vertical distance from water source to discharge point (ft)
• \( Friction\ Loss \) — Pressure loss due to friction in pipes and fittings (ft)

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

3. Importance of TDH Calculation

Details: Accurate TDH calculation is crucial for selecting the right pump for a water system. It ensures the pump has sufficient power to overcome both the vertical lift and friction losses in the piping system.

4. Using the Calculator

Tips: Enter static head (vertical distance in feet) and friction loss (in feet). Both values must be positive numbers. Friction loss can be calculated separately using pipe friction calculators.

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 the system.

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

Q3: Why is TDH important for pump selection?
A: Pumps are rated for specific flow rates at specific TDH values. Choosing a pump with insufficient TDH capacity will result in poor performance.

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

Q5: What units should I use for TDH?
A: TDH is typically measured in feet (US) or meters (metric). This calculator uses feet.