Several key parameters of centrifugal pumps

ATACH Industrial Pump Factory often encounters such inquiries from customers: We want to purchase centrifugal pumps. 

Could you please tell us what key information we should provide for your selection and quotation? 

We now analyze as follows:

3.1 Operating point: The point on the performance curve that represents the actual operating condition of the pump, which is the intersection of the head curve and the resistance curve.

3.2 Specified point: The point determined by the specified flow rate and specified head on the performance curve. 

3.3 Head: The algebraic difference between the total outlet head and the total inlet head. 

3.4. Head off: The total water head when the pump flow rate is zero. 

3.5 Specified head: The total head corresponding to the flow rate specified on the contract. 

3.6. Net Positive Suction Head (NPSH) : The difference between the absolute total inlet head relative to the NPSH reference plane and the vaporization pressure head. 

3.7. Allowable suction vacuum height: For different types of pumps and different usage conditions, consider a certain safety margin for the suction vacuum height. 

3.8. Rated flow: The flow rate at the guarantee point. 

3.9. Pump output power: The power transmitted by the pump to the output liquid. 

3.10. Pump input power (shaft power) : The power transmitted by the drive motor to the pump. 

3.11. Input power of the drive machine: The power absorbed by the pump drive machine.