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 a crucial parameter for selecting and sizing centrifugal pumps.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• \( Static\ Head \) — Vertical distance from water surface to discharge point (ft)
• \( Friction\ Loss \) — Head loss due to friction in pipes and fittings (ft)
• \( Pressure\ Head \) — Additional pressure required at discharge (ft, if applicable)

Explanation: The equation sums all resistance components the pump must overcome to move fluid through the system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is essential for proper pump selection, ensuring the pump can provide enough head to overcome system resistance and deliver the required flow rate.

4. Using the Calculator

Tips: Enter static head (vertical distance), friction loss (from pipe calculations), and any additional pressure head required. All values must be in feet.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is the vertical distance only, while dynamic head includes friction losses and pressure requirements.

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

Q3: When is pressure head needed?
A: When the discharge point requires additional pressure (e.g., sprinkler systems or pressurized tanks).

Q4: What units should I use?
A: The calculator uses feet for all inputs. Convert from PSI to feet by multiplying by 2.31 (for water).

Q5: Does this account for NPSH requirements?
A: No, Net Positive Suction Head is a separate calculation for pump suction conditions.