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Total Pump Head Formula:
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Total Dynamic Head (TDH) is the total equivalent height that a fluid is to be pumped, taking into account static head, friction losses, and pressure head. It's a crucial parameter in pump system design and selection.
The calculator uses the TDH formula:
Where:
Explanation: The equation sums all components of head that the pump must overcome to move fluid through the system.
Details: Accurate TDH calculation is essential for proper pump selection, ensuring the pump can provide sufficient head to overcome system resistance and deliver the required flow rate.
Tips: Enter all values in feet. Static head is the vertical distance, friction loss depends on pipe characteristics, and pressure head represents any additional pressure requirements.
Q1: What's the difference between static head and TDH?
A: Static head is just the vertical elevation difference, while TDH includes all resistance components the pump must overcome.
Q2: How do I determine friction loss?
A: Friction loss depends on pipe diameter, length, material, flow rate, and fluid properties. It's typically calculated using the Darcy-Weisbach equation.
Q3: When is pressure head needed?
A: Pressure head is required when the system needs to maintain pressure at the discharge point (e.g., for sprinkler systems or pressure vessels).
Q4: What units should be used?
A: While we use feet in this calculator, TDH can also be expressed in meters or psi (though feet of head is most common in pump curves).
Q5: How does TDH affect pump selection?
A: The pump's performance curve must show it can deliver the required flow rate at the calculated TDH. Operating outside this range reduces efficiency and can damage the pump.