Pump Torque Calculation

Pump Torque Formula:

\[ T = \frac{Q \times P}{2\pi \times N \times \eta} \]

Flow Rate (Q):

m³/s

Pressure (P):

Speed (N):

rev/s

Efficiency (η):

unitless

Torque (T):

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1. What Is Pump Torque Calculation?

Pump torque calculation determines the rotational force required to drive a pump based on flow rate, pressure, speed, and efficiency. It's essential for proper pump selection and motor sizing in various industrial applications.

2. How Does The Calculator Work?

The calculator uses the pump torque formula:

\[ T = \frac{Q \times P}{2\pi \times N \times \eta} \]

Where:

\( T \) — Torque (Nm)
\( Q \) — Flow rate (m³/s)
\( P \) — Pressure (Pa)
\( N \) — Rotational speed (rev/s)
\( \eta \) — Pump efficiency (unitless)

Explanation: This formula calculates the torque required to overcome the hydraulic forces and drive the pump at the specified operating conditions.

3. Importance Of Torque Calculation

Details: Accurate torque calculation is crucial for proper motor selection, preventing overload conditions, ensuring efficient operation, and extending equipment lifespan.

4. Using The Calculator

Tips: Enter flow rate in m³/s, pressure in Pascals, rotational speed in revolutions per second, and efficiency as a decimal between 0 and 1. All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What units should I use for this calculation?
A: Use consistent SI units: flow rate in m³/s, pressure in Pascals (Pa), speed in revolutions per second (rev/s), and efficiency as a unitless decimal.

Q2: How does efficiency affect torque requirements?
A: Lower efficiency values result in higher torque requirements, as more energy is lost to friction and other inefficiencies within the pump.

Q3: Can this formula be used for all pump types?
A: This formula provides a general calculation for pump torque. Specific pump designs may have additional factors to consider for precise torque requirements.

Q4: Why is torque calculation important for motor selection?
A: Proper torque calculation ensures the selected motor can provide sufficient starting and running torque without overheating or stalling.

Q5: How does speed affect torque requirements?
A: Higher rotational speeds generally require less torque for the same power output, as torque is inversely proportional to speed in this calculation.