Which of the following is NOT the main criterion for selection of hydraulic pumps?

Explanation:

While selecting a pump for a specific application, several key parameters must be considered to ensure optimal performance and reliability. The main criteria include:

1. Maximum Operating Pressure:

   • The maximum pressure the pump can handle during operation.

2. Maximum Delivery:

   • The highest flow rate the pump can deliver.

3. Type of Control:

   • The control mechanism used to regulate the pump's operation.

4. Pump Drive Speed:

   • The speed at which the pump operates, usually dictated by the motor or engine driving it.

5. Type of Fluid:

   • The nature of the fluid being pumped, including its viscosity, corrosiveness, and temperature.

6. Pump Contamination Tolerance:

   • The pump's ability to handle contaminants in the fluid without significant wear or damage.

7. Pump Noise:

   • The level of noise produced by the pump during operation, which may be important in noise-sensitive environments.

8. Size and Weight of the Pump:

   • The physical dimensions and weight of the pump, which can impact installation and mobility.

9. Pump Efficiency:

   • The overall energy efficiency of the pump, affecting operational costs.

10. Cost:

    • The initial purchase price and the total cost of ownership over the pump's lifespan.

Additional Information

• Atmospheric pressure is generally not a main criterion for the selection of hydraulic pumps.
• This is because hydraulic systems are usually closed systems, and the internal pressures within the system are far more critical to the pump’s performance than external atmospheric pressure.