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 static head, friction losses, and velocity head. It's a crucial parameter in pump selection and system design.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

Where:

• \( H_{static} \) — Static head (elevation difference in meters)
• \( H_{friction} \) — Friction head loss (meters)
• \( H_{velocity} \) — Velocity head (meters)
• \( V \) — Fluid velocity (m/s)
• \( g \) — Gravitational acceleration (9.81 m/s²)

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 essential for proper pump selection, ensuring the pump can overcome system resistance and deliver required flow rates.

4. Using the Calculator

Tips: Enter static head (elevation difference), friction losses (from calculations or tables), and fluid velocity. All values must be non-negative.

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 and velocity components.

Q2: How do I determine friction losses?
A: Use Darcy-Weisbach or Hazen-Williams equations with pipe length, diameter, roughness, and flow rate.

Q3: When is velocity head significant?
A: Velocity head becomes important in high-velocity systems (typically >2 m/s) but is often negligible in low-velocity applications.

Q4: What units should I use?
A: Consistent SI units are recommended (meters for head, m/s for velocity).

Q5: How does TDH affect pump power requirements?
A: Pump power is directly proportional to TDH and flow rate (Power = ρgQH/η).