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  • Rotary Twin Gear Pumps

    "Paras Group" Gear pump is a rotary positive displacement pump with positive pressure characteristic. The Capacity of the pump varies directly with speed but remain constant against pressure. however due to running clearance between the casing & impeller some liquid always bypasses to suction causing sleep which depend upon the deferential pressure viscosity of the liquid & of course the workman-ship. the pumps are capable of handling any viscosity. the sleep reduced with viscosity but the viscosity power increases. the pump has sed priming capability however some net positive to avoid cavitation depending upon the viscosity of the liquid to be pumped & the pump speed

    INTERNAL POWER LOSSES

    The internal power losses in rotary pumps are of two types the mechanical losses is the power necessary to overcome frictional drag of all the moving part withing the pump while viscous losses id power required to overcome liquid viscous drag & shearing action of the fluid. this can be computed from the graph on the opposite side

    H.P CALCULATION

    The break horse power required to drive a rotary pump is sum of the theoretical hp & internal losses. the theoretical horse power is the actual work done is moving the fluid from inlet port to out let pressure condition & is product of constant C=0.037,Capacity in cub. Mt/hr. & pressure Kg/Sq. Cm or constant C=2.39,Capacity is us G.P.M. & Pressure in PSI

    PUMP SELECTION & USES

    The bush bearing type of pump can be used for clean viscous liquid having sufficient lubricating Value such as clean lube oil vegetable oil, Fish & Animal oil, Gear oil, Glycerine, Hydraulic oil for intermittent duty. However for continues duty pump with needle roller bearing in SI Series should be selected for liquid having low viscosity poor lubricating values of containing dirts or impurities Such as asphalt bitumen Furnace oil tar, Cellulose, Starch LSHS, HPS, Molasses Napthia, Phenol resin, RFO, Silicate Soap Solution Viscous wax etc.

    INSPECTION AND TESTING

    All pumps are individually tested for its performance as per JIS B- 8312- 1976

    AVAILABLE MODEL SIZE & CAPACITY
    Size & Model 1440 RPM CAPACITY PUMP GD2 IN KGM2 ELE MOTOR H.P FR.SIZE
    LPM US GPM M3/HR
    ½" 50 P-M-L 06.30 / 16.60 / 25.00 02.20 / 04.40 / 06.60 0.50 / 1.00 / 1.50 0.0008 / 0.0009 / 0.0010 0.50 / 0.75 / 1.00 71M / 80M / 80M
    1" 100 P-M-L 33.30 / 50.00 / 60.00 08.80 / 13.20 / 15.94 2.00 / 3.00 / 3.60 0.0007 / 0.0008 / 0.0009 0.75 / 1.00 / 2.00 80M / 80M / 90L
    1.½" 150 P-M-L 83.30 / 100.00 / 125.00 22.00 / 26.40 / 33.30 5.00 / 6.00 / 7.60 0.0008 / 0.0009 / 0.0032 2.00 / 3.00 / 5.00 90L / 100L / 112M
    2" 200 P-M-L 150.00 / 166.00 / 200.00 39.00 / 44.00 / 52.80 5.00 / 6.00 / 7.60 0.0069 / 0.0074 / 0.008 3.00 / 5.00 / 7.50 100L / 112M / 132S
    2.½" 250 P-M-L 250.00 / 299.88 / 333.30 66.00 / 79.20 / 88.00 9.00 / 10.00 / 12.0 0.01 / 0.013 / 0.015 5.00 / 7.50 / 10.00 112M / 132S / 132M
    3" 300 P-M-L 415.00 / 449.82 / 500.00 105.00 / 118.00 / 132.00 15.00 / 18.00 / 20.00 0.02 / 0.024 / 0.027 10.00 / 12.50 / 15.00 132M /160M / 160M
    4" 400 P-M-L 599.76 / 666.66 / 833.30 158.40 / 176.00 / 220.00 25.00 / 27.00 / 30.00 0.056 / 0.062 / 0.072 15.00 / 20.00 / 25.00 160M / 160L / 180M
    5" 500 P-M-L 1000.00 / 1250.00 / 1499.00 264.00 / 330.00 / 396.00 60.00 / 75.00 / 90.00 0.098 / 0.112 / 0.177 20.00 / 30.00 / 40.00 160L / 180L / 200L
    6" 600 P-M-L 1660.00 / 1832.00 / 2083 .00 440.00 / 484.00 / 550.00 100.00 / 110.00 / 125.00 0.27 / 0.31 / 0.335 30.00 / 50.00 / 60.00 180L /225S / 225M
    6" 600 P-M-L 2499.00 / 2915.50 / 3332.00 660.00 / 770.00 / 880.00 160.00 / 175.00 / 200.00 0.4561 / 0.542 / 0.601 50.00 / 75.00 / 100.00 225S/ 250M / 280S