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 represents the actual work that the pump must accomplish to move the fluid from the suction point to the discharge point.

2. How Does the Calculator Work?

The calculator uses the TDH formula:

Where:

• Static Head — The vertical distance between the fluid level in the suction tank and the discharge point (ft)
• Friction Loss — Head loss due to friction in pipes, valves, and fittings (ft)
• Pressure Head — Additional pressure required at discharge point (ft of fluid)

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

3. Importance of TDH Calculation

Details: Accurate TDH calculation is crucial for proper pump selection and system design. An undersized pump won't deliver required flow, while an oversized pump wastes energy and may cause operational issues.

4. Using the Calculator

Tips: Enter all values in feet. Static head is the vertical distance, friction loss can be calculated separately, and pressure head is zero for open systems.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between static head and dynamic head?
A: Static head is just the vertical elevation difference, while dynamic head includes friction and pressure components.

Q2: How do I determine friction loss?
A: Friction loss depends on pipe size, length, material, flow rate, and number of fittings. Use Darcy-Weisbach or Hazen-Williams equations.

Q3: When is pressure head needed?
A: Pressure head is required when the discharge goes to a pressurized system (like a boiler) rather than an open tank.

Q4: What units should I use?
A: While feet are common in the US, the formula works with any consistent units (meters, etc.) as long as all terms use the same unit.

Q5: Does TDH change with flow rate?
A: Static head remains constant, but friction loss increases with flow rate, making TDH flow-dependent.