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, friction head loss, and velocity head.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• Static Head — Vertical distance between the fluid surface and the discharge point (meters)
• Friction Head Loss — Pressure loss due to friction in pipes and fittings (meters)
• Velocity Head — Energy due to fluid motion (V²/2g, meters)

Explanation: The equation accounts for all energy requirements needed to move fluid through a piping system.

3. Importance of TDH Calculation

Details: Accurate TDH calculation is crucial for proper pump selection and system design. It determines the pump's required energy output to move fluid through the system.

4. Using the Calculator

Tips: Enter all values in meters. Static head is the elevation difference, friction loss can be calculated separately, and velocity head is typically small (often negligible for low velocity systems).

5. Frequently Asked Questions (FAQ)

Q1: Which component of TDH is usually the largest?
A: In most systems, static head (elevation difference) is the dominant component, though friction loss can be significant in long pipe runs.

Q2: When can velocity head be neglected?
A: Velocity head can often be neglected when fluid velocities are low (below 1 m/s) as it becomes a very small portion of the total head.

Q3: How is friction head loss determined?
A: Friction loss is calculated using the Darcy-Weisbach equation or Hazen-Williams equation, considering pipe length, diameter, roughness, and flow rate.

Q4: Does TDH change with flow rate?
A: Yes, friction loss increases with flow rate (approximately with the square of velocity), so TDH increases with higher flow rates.

Q5: How does TDH relate to pump power requirements?
A: Pump power is directly proportional to TDH. Higher TDH requires more pump power to move the same flow rate.