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  • News >> Single screw pump selection key points

    Single screw pump selection key points

    1 pump pressure to determine:

    Single screw pump maximum output pressure is according to the liner bushing series that the lead can be determined:

    Level 1: maximum working pressure of 0.6 MPa;

    Level 2: maximum working pressure of 1.2 MPa;

    Level 4: maximum working pressure of 2.4 MPa;

    As the transmission medium is different, for containing severe wear resistance of the medium, please refer to table a selected Bush series.

    Table 1: according to media on wear resistance of selected Bush series

    Wear a level two

    No 0.6MPa 1.2MPa

    General 0.4MPa 0.8MPa

    Severe 0.2MPa 0.4MPa

    The 2 single screw pump speed selection:

    Single screw pump because of its structural features, mostly used in the conveying of high viscosity liquid and the liquid containing the particles, so the choice of rotation is critical, according to experience, listed in table two, table three, you can according to the specific situation of comprehensive consideration.

    Table two: according to the wear of the pump selection medium speed

    Wear resistance of medium speed ( RPM )

    Without fresh water, accelerant, oil, juice, minced meat, paint, soap, water, blood glycerol 400-1000

    General slurry, suspension, industrial waste water, waste water, paint pigment ( sugar ), mortar, fish, wheat bran, rapeseed oil after filtering sediment 200-400

    Severe lime slurry, clay, plaster, clay 50-200

    * table gives the delivery of specific medium and wear characteristics of the special case, please note that the characteristics of the medium with the concentration and temperature changes.

    * when the pump specifications, speed should be low.

    Table three: according to the viscosity of the medium selection of pump speed

    The viscosity of the medium ( CST ) 1-1000 1000-10000 10000-100000 100000

    1000000

    Speed ( RPM ) 400-1000 200-400 < 200 < 100

    * in the selection of speed according to the experience, because of some other factors also affect the speed selection, in the final of the numerical value of the best manufacturers and negotiate.

    The 3 single screw pump bush rubber material selection:

    Rubber bushing for single-screw pump, is a single-screw pump wearing parts, it is the choice of good or bad, directly affects the lining of the life, under normal conditions of life Bush for 3-6 months, if the chosen properly, the bushing may be detached from the steel or rubber blocks away. So we asked for the basic properties of rubber and rubber on the adaptability of various media to understand, according to our experience are listed in table four, table five.

    Table four: the basic characteristics of rubber

    Rubber, nitrile rubber chloroprene rubber properties of NBR CR PPM EPDM fluorine rubber ethylene-propylene rubber

    High temperature + 120 C + 110 C + 200 C + 150 C

    Wear resistance and very good and very good

    The aging resistance of very good quality and

    Ozone resistance no actor actor actor

    Steam resistant well not gifted actor

    Flame resistance good actor actor actor

    Table five: single screw pump commonly used rubber bushing

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