Total Dynamic Head Pump Calculator

TDH Equation:

\[ TDH = \text{Suction Head} + \text{Discharge Head} + \text{Friction Loss} + \text{Velocity Head} \]

Suction Head:

Discharge Head:

Friction Loss:

Velocity Head:

Total Dynamic Head (TDH):

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1. What is Total Dynamic Head (TDH)?

Total Dynamic Head (TDH) represents the total equivalent height that a fluid is to be pumped, taking into account the static elevation change, friction losses, and velocity head. It is a crucial parameter in pump system design and selection.

2. How Does the Calculator Work?

The calculator uses the TDH equation:

\[ TDH = \text{Suction Head} + \text{Discharge Head} + \text{Friction Loss} + \text{Velocity Head} \]

Where:

Suction Head — Vertical distance from pump centerline to source liquid surface
Discharge Head — Vertical distance from pump centerline to discharge point
Friction Loss — Head loss due to friction in pipes and fittings
Velocity Head — Energy due to fluid velocity (\( v^2/2g \))

Explanation: The equation accounts for all energy requirements needed to move fluid through the pumping 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 the required flow rate at the desired pressure.

4. Using the Calculator

Tips: Enter all head values in feet. Ensure measurements are accurate and include all system components. 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 elevation difference only, while dynamic head includes friction and velocity components.

Q2: How do I measure friction loss?
A: Friction loss is calculated based on pipe diameter, length, material, flow rate, and number of fittings using standard hydraulic tables or formulas.

Q3: When is velocity head significant?
A: Velocity head becomes significant in high-flow systems or when fluid velocity exceeds 5-10 ft/s. In many applications, it's relatively small.

Q4: What units should I use for TDH?
A: TDH is typically measured in feet (US) or meters (metric). This calculator uses feet.

Q5: How does TDH affect pump selection?
A: TDH determines the pump's required pressure capability. The pump must be selected to operate efficiently at the calculated TDH and desired flow rate.