1. What is Total Dynamic Head (TDH)?

Total Dynamic Head (TDH) is the total equivalent height that a fluid needs to be pumped, accounting for static head, friction losses, and any additional pressure requirements. It's a crucial parameter in pump selection and system design.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• Static Head — Vertical distance from the liquid surface to the discharge point (ft)
• Friction Loss — Head loss due to pipe friction and fittings (ft)
• Pressure Head — Additional pressure required at discharge (converted to ft of head)

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 deliver the required flow rate against the system's total resistance.

4. Using the Calculator

Tips: Enter all values in feet. Static head is the vertical lift, friction loss includes pipe and fitting losses, and pressure head is any additional pressure requirement (set to 0 if not applicable).

5. Frequently Asked Questions (FAQ)

Q1: How do I determine friction loss?
A: Friction loss can be calculated using the Darcy-Weisbach equation or Hazen-Williams formula based on pipe size, length, material, and flow rate.

Q2: What if I have pressure in psi instead of feet?
A: Convert psi to feet by multiplying by 2.31 (1 psi = 2.31 ft of water head).

Q3: Does TDH change with flow rate?
A: Yes, friction loss increases with flow rate, so TDH is flow-rate dependent.

Q4: What's typical TDH for residential systems?
A: Typically 30-100 ft, depending on house height, distance, and fixture requirements.

Q5: How does TDH relate to pump curves?
A: The operating point is where your system curve (TDH vs flow) intersects the pump's performance curve.