Typical chemical pump characteristics and selection requirements

Pump name Weigh

special      point

selected use want begging

Feed pump (including raw material pump and

Intermediate feed pump)

1 , the flow is stable

2 , the general lift is higher

3 , some raw materials are more viscous or contain solid particles

4 , the pump inlet temperature is generally normal temperature, but the inlet temperature of some intermediate feed pumps can also be greater than 100 °C

5 , can not stop working

1 , generally choose centrifugal pump

2. When the head is high, consider using a positive displacement pump or a high speed pump.

3 , the pump backup rate is 100%

Return pump (including tower top, middle section

And bottom reflux pump)

1. The flow range is large and the head is low.

2 , the pump inlet temperature is not high, generally 30~60 °C

3 , high reliability of work requirements

1 , generally use a single-stage centrifugal pump

2 , the pump backup rate is 50%~100%

 

Tower pump

1 , the flow fluctuation range is large (usually use liquid level control flow)

2 , the flow is large

3 , the pump inlet temperature is higher, generally greater than 100 °C

4 , the liquid is generally in the gas-liquid two-phase state, NPSHa small

5 , high reliability requirements

6 , working conditions are harsh, generally fouling

1. General single-stage centrifugal pump. When the flow rate is large, double suction pump can be selected.

2. Use a low NPSH pump and use the necessary filling head

3 , the pump backup rate is 100%

Circulating pump

1 , the flow is stable, the head is low

2 , a wide variety of media

1 , select a single-stage centrifugal pump

2 , according to the type and material of the pump selected by the medium

3 , the pump backup rate is 50%~100%

Product pump

1 , the flow is small

2 , the head is lower

3 , the pump inlet temperature is low (the top product is generally normal temperature, the middle extraction and the bottom product temperature is slightly higher)

4 , some products pump intermittent operation

1 , should choose a single-stage centrifugal pump

2 , for high purity or valuable products, the seal is required to be reliable, the pump spare rate is 100% ; for general products, the standby rate is 50%~100% . Product pumps for intermittent operation, generally not for equipment pumps

Injection pump

1 , the flow is very small, the measurement requirements are strict

2 , work at room temperature

3 , higher pressure

4 , the injection medium is a chemical, often corrosive

1 , use plunger or diaphragm metering pump

2 , for corrosive media, the pump's overcurrent components are usually made of corrosion-resistant materials

Sewage pump

1 , the flow is small, the head is lower

2 , there are often corrosive media and abrasive particles in the sewage

3 , control flow required for continuous delivery

1. Select sewage pump and slurry pump

2 , the pump backup rate is 100%

3 , often need to use corrosion-resistant materials

Fuel oil pump

1. The flow rate is small, and the pump outlet pressure is stable (generally 1.0~1.2MPa )

2 , higher viscosity

3 , the pump inlet temperature is generally not high

1 , generally can choose rotor pump or centrifugal pump

2 , due to the higher viscosity, generally need to be heated to transport

3 , the pump backup rate is 100%

Lubricating oil pump and sealing pump

1. Lubricating oil pressure is generally 0.1~0.2Mpa

2 , mechanical seal sealing liquid pressure is generally higher than the sealing chamber pressure 0.05~0.15MPa

1 , generally with the host supporting supply

2 , generally screw pump and gear pump, but the centralized oil supply of centrifugal compressor often uses centrifugal pump