TaiBang 3GR three screw pump selection should note the following
When screw pump selection, pump as much as possible to make a detailed understanding of the conditions of use , in addition to operating parameters such as flow, pressure needs than clear, the transmission medium characteristics such as corrosive media , including steam , with the ratio of solid solution and size of the solid particles and the medium temperature , viscosity , specific gravity, suction conditions of corrosive materials , etc. , and the pump device , installation conditions have to understand , based on our experience, three screw pump selection should note the following :

Speed Selection

1 to specification transport medium viscosity and pump speed range is determined :

Transmission of high viscosity media , the pump should be selected low speed , if the viscosity is low , the corresponding optional high speed:

1 ) when the medium viscosity > 20 ° E, the large size of the three screw ( 60mm outer diameter than the main bar ) , speed to 970rpm or 720rpm appropriate, if a higher viscosity ( viscosity > 80 ° E) as viscose , use can reduce the speed recommended 200-500rpm;

2 ) For the small size of the three screw pump, the medium viscosity > 20 ° E, speed 970rpm to 1450rpm or appropriate, if a higher viscosity ( viscosity > 80 ° E), can reduce the speed using the recommended 300-600rpm;

2, the higher the speed of the pump , in the same performance parameters, the smaller the volume of the pump , but because of high speed, high power friction , wear of the pump is large, the life is short, if the transmission medium or poor lubrication containing trace impurities should choose a lower speed in order to extend the life of the pump , it is recommended 1450rpm or less.

Select structure

1 , conveyor lubrication oils at temperatures below 80 ° C to select the built- bearing structure of the pump ;

2, the temperature exceeds 80 ° C or transport medium lubrication is poor, select the external pump bearing structure ;

Select double- pump 3 heating pump structure , transportation , poor mobility, high viscosity media or require the transmission medium heat or thermal insulation ;

4, the high-temperature transport , you should choose a pump made of high-temperature materials , please contact our factory .

Optional matching motor

After the pump selection is determined , based on the sample data can be found in three screw shaft power N, the shaft power plus a power reserve after the motor as an option based on the general power Nm motor shaft power should not be less than N multiplied by the value of the power reserve coefficient K, the value of K values can refer to the following table:

Three screw pump flow, pressure at the same speed, the viscosity of approximately linear relationship , the higher the pressure, the flow is smaller.

N (KW) ≤ 5 5 × N ≤ 10 10 N> 50
Nm (kw) ≥ 1.25 × N ≥ 1.2 × N ≥ 1.15 × N ≥ 1.1 × N
        Under the same viscosity , pressure, flow and speed of three screw approximately proportional .

Same speed, viscosity , and pressure is approximately proportional to shaft power .

The same viscosity, under pressure , shaft power and speed is approximately proportional .

When the viscosity increases , flow and shaft power are increased, but the relationship is more complex because of which , if necessary, to the professional advice.

In short, as long as the proper selection , maintenance and reasonable, three screw can ensure satisfactory operation.