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How to choose a pump?

Data: 2021-02-02


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How to choose a pump?

The principle of pump selection

1. Make the type and performance of the selected pump meet the requirements of process parameters such as device flow, head, pressure, temperature, cavitation flow, and suction.

2. Must meet the requirements of media characteristics.

For pumps that transport flammable, explosive, toxic, or valuable media, reliable shaft seals or leak-free pumps, such as magnetic drive pumps, diaphragm pumps, and canned pumps, are required

For pumps that transport corrosive media, the convection parts are required to be made of corrosion-resistant materials, such as AFB stainless steel corrosion-resistant pumps, and CQF engineering plastic magnetic drive pumps.
FSB-L (long bracket) centrifugal Centrifugal Pump
For pumps that transport solid particles, the convection parts are required to be made of wear-resistant materials, and the shaft seal should be flushed with clean liquid when necessary.

3. High mechanical reliability, low noise and low vibration.

4. Economically, the total cost of equipment costs, operating costs, maintenance costs and management costs should be taken into consideration as the lowest.

5. The centrifugal pump has the characteristics of high speed, small size, light weight, high efficiency, large flow, simple structure, no pulsation in infusion, stable performance, easy operation and convenient maintenance.

Therefore, in addition to the following conditions, centrifugal pumps should be used as much as possible:

  • When there are metering requirements, choose metering pump
  • High head requirements, small flow and no suitable small flow high head centrifugal pumps can be used, reciprocating pumps can be used, if the cavitation requirements are not high, vortex pumps can also be used.
  • When the head is very low and the flow is large, an axial flow pump and a mixed flow pump can be used.
  • When the medium viscosity is large (greater than 650~1000mm2/s), you can consider using a rotor pump or a reciprocating pump (gear pump, screw pump)
  • When the air content of the medium is 75%, the flow rate is small and the viscosity is less than 37.4mm2/s, a vortex pump can be used.
  • For occasions with frequent start-up or inconvenient pumping, pumps with self-priming performance should be selected, such as self-priming centrifugal pumps, self-priming vortex pumps, and pneumatic (electric) diaphragm pumps.

The selection basis of the pump

The basis for pump selection should be considered from five aspects according to the process flow and water supply and drainage requirements, including liquid delivery volume, device head, liquid properties, piping layout and operating conditions, etc.

1. Flow rate is one of the important performance data of pump selection, it is directly related to the production capacity and conveying capacity of the whole device. 

For example, in the process design of the design institute, the normal, minimum and maximum flow rates of the pump can be calculated. When selecting the pump, take the maximum flow as the basis and take into account the normal flow. When there is no maximum flow, 1.1 times the normal flow can usually be taken as the maximum flow.

2. The head required by the installation system is another important performance data for pump selection. Generally, the head should be selected after magnifying 5%-10% of the margin.

3. Liquid properties, including the name of the liquid medium, physical properties, chemical properties and other properties. The physical properties include temperature c, density d, viscosity u, solid particle diameter and gas content in the medium, etc. 

Centrifugal Pump for sale by Paragon

This relates to the lift of the system, the effective gas Calculation of residual allowance and suitable pump type: chemical properties, mainly refer to the chemical corrosiveness and toxicity of the liquid medium, which is an important basis for the selection of pump materials and the type of shaft seal.

4. The piping layout conditions of the device system refer to the liquid delivery height and the liquid delivery distance from the liquid delivery direction, the lowest liquid level on the suction side, the highest liquid level on the discharge side, etc. Some data and piping specifications and their length, materials, pipe fitting specifications, and quantity Etc. in order to carry out the combing head calculation and cavitation margin check.

5. There are many operating conditions, such as liquid operation T saturated steam power P, suction side pressure PS (absolute), discharge side container pressure PZ, altitude, ambient temperature operation is intermittent or continuous, and the pump position is fixed The ones are still removable.

If there is still unclear reference about pump selection, please consult Paragon-the supplier of centrifugal pumps.