How to Calculate Pump Shaft Torque from Flow Rate, RPM, and Diameter?

In summary, "Pump Shaft Torque" refers to the rotational force needed to turn the pump shaft and is important in the design and operation of a pump. It helps determine the power and motor size needed, as well as the appropriate pump for a specific application. Several factors, such as pump type and size, fluid properties, and system resistance, can affect Pump Shaft Torque. It is calculated using the formula: T = (P x Q) / (63025 x n) and is typically measured in pound-feet or Newton-meters, with variations depending on the industry.
  • #1
Zarathuztra
36
0
Attempting to determine the torque on the shaft of a pump. Known values are flow rate, RPM, and shaft diameter.

1. What other values are needed to make the calculation?

2. What is the equation I can use for this?
 
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  • #2
1) Pressure and Efficiency I think.

2)
Output power = pressure * flow rate
Input power = output power/efficiency
Input power = Torque * Angular velocity

Make sure you are consistent with the units.
 
  • #3
Is the pump itself known or are you trying to pick one? You don't necessarily need to calculate or pick the rpm.
 

FAQ: How to Calculate Pump Shaft Torque from Flow Rate, RPM, and Diameter?

1. What is "Pump Shaft Torque"?

"Pump Shaft Torque" refers to the amount of rotational force that is required to turn the pump shaft. It is an important factor to consider in the design and operation of a pump, as it affects the efficiency and performance of the pump.

2. Why is it important to calculate Pump Shaft Torque?

Calculating Pump Shaft Torque is important because it helps determine the amount of power needed to drive the pump, as well as the size and type of motor that should be used. It also helps in selecting the appropriate pump for a specific application.

3. What factors affect Pump Shaft Torque?

There are several factors that can affect Pump Shaft Torque, including the type and size of the pump, the type of fluid being pumped, the pump speed, and the pump efficiency. Other factors may include the presence of any friction or resistance in the pump system, as well as any changes in the fluid viscosity or temperature.

4. How is Pump Shaft Torque calculated?

Pump Shaft Torque can be calculated using the formula: T = (P x Q) / (63025 x n), where T is the torque (in lb-ft), P is the pressure (in psi), Q is the flow rate (in gpm), and n is the pump speed (in rpm). It is important to note that this formula is only an estimate and may vary depending on the specific pump and application.

5. What are some common units used to measure Pump Shaft Torque?

Pump Shaft Torque is typically measured in pound-feet (lb-ft) or Newton-meters (N-m). In some cases, it may also be measured in inch-pounds (in-lb) or kilogram-meters (kg-m). The units used may vary depending on the application and industry standards.

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