• Contact us +91 9898816341
  • Three Screw Pump

      Three Screw Pump

      The screw pump of series P 3S FP for a pump and up to 40 bar are three screw rotary positive displacement pump for handling lubricating fluids. They must not contain any abrasive particles nor chemically attack the pump materials. The pump are designed as flange mounted pump and via an intermidate lantern connected with the driving motor.

    Paras Three Screw pumps employ three screw elements - one power screw and two idler screws running in three precision bores in the housing or liner. The screws are so profiled that they form a liquid tight seal between the threads. As the screws rotate, pockets/ cavities are formed where liquid gets trapped and conveyed from one end of the infinite stroke. This results in smooth, pulsation free flow with extremely low noise and vibration levels, almost impossible to be achieved by any other design of positive displacement or other types.

    The power rotor does not drive the idlers as commonly believed. The hydraulic forces acting on screw flanks turn the idlers torquelessly thus reduce the friction. The idlers simply roll over the root diameter of power screw to reduce the unit pressure, centralize the power rotor and absorb the radial loads. A balance piston integrally machined on power rotor balances the axial thrusts.

    While in operation, the screws are in hydrodynamic balance on film lubrication and do not require any additional bearings. The one ball bearing often used is only for axial positioning of rotor and safer operation of mechanical seals. Small rotor dimensions enable the pump to be operated at high speeds directly coupled 2800 or 2900 RPM motors or other prime movers. Such unique design and features have demonstrated excellent reliability with pumps in continuous operation non-stop for decades together without replacement of any components or maintenance on clean fluids.

    Typical Pumped Media

    Fuel Oil, Lube Oil, Mineral Oil, Vegetable Oil, Crude Oil, Glycol, Bitumen, Resins, Paint, Viscose, Pulp, Greases, Molaffes, etc.

    Typical Applications

    Lubrication, Hydraulic jacking, Firing, Transfer, Circulation

    Typical Industries

    Power generation, Marine, Navy, Oil & Gas, General Industrial, Machine Tool, Steel, Cement, Chemical, Rayon

    Maximum performance data

    • Capacity : Up to 2500 lpm
    • Diff. Pressure : Up to 280 bar

    Operating parameters

    • Viscosity : From 3 cSt to 50,000 cSt
    • Fluid Temperature : Up to 80 deg. centigrade
    • Speed : Up to 11000 rpm.

    Material Of Construction

    • Casing options : Cast Iron / Cast Steel / Fabricated / SG Iron
    • Casing Insert Options : Cast Iron / Aluminium / No casing insert
    • Screws : Carbon Steel / Alloy Steel
    • Sealing Options : Gland packing / Mechanical seal

    Construction Features

    • Bearing options : Internal / External ball bearing / Bush bearing
    • Jacketing options : Front cover / gland cover / casing / foot
    • Mounting options : Horizontal Foot / Horizontal Flange / Vertical Pedestal / Vertical Tank
    • Relief valve options : Built-in / Line mounted

    Construction Features

    • Bearing options : Internal / External ball bearing / Bush bearing
    • Jacketing options : Front cover / gland cover / casing / foot
    • Mounting options : Horizontal Foot / Horizontal Flange / Vertical Pedestal / Vertical Tank
    • Relief valve options : Built-in / Line mounted

    Accessories

    Relief valves, base frame, coupling, coupling guard, companion flanges, pressure gauges, electric motor, variable speed drives, etc. Pump mounted on a base plate with above accessories as a ready to install system can be supplied

    Salient Features

    • High reliability
    • Long service life
    • Negligible maintenance
    • High efficiency
    • Self priming
    • Smooth pulsation free flow
    • Low noise and vibrations
    • High speed capability
    • Insensitive to viscosities
    • High pressure capability
    • Axial flow - no churning, chewing or shearing
    • Excellent suction capability
    • Hydraulic balancing of forces eliminates need for any bearings