Eccentric Helical Rotor Pumps
Application
Handling abrasive, neutral or aggressive liquids, the viscosity and consistency of which may be just fluid. Medium with fibrous content or containing very high proportions of solids, as well as gaseous, aerated and foaming compounds can also be pumped safely. This pump is used especially in food-, chemical-, ceramic-, cosmetic-, cellulose-, plastic-, soa and fat-industry, agriculture, filter technique, ship-building, water treatment plants.
Design
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Horizontal or vertical self-priming eccentric helical rotor pumps. Stator and rotor (wearing parts) are replaceable.
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Pump and motor are connected flexibly to each other and mounted on a common base plate. A relief valve must be provided on the discharge side of the pump if a shut-off valve is installed on pump outlet. If a dry running may occur the pump must be protected by separate equipment.
Connections
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Suction socket: vertical upwards
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Discharge socket: axial
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If direction of rotation changed: connections opposite
Temperature
Capacity range
Delivery head
Shaft sealing
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stuffing box or mechanical seal
Materials
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Casing: cast iron, steel, stainless steel or cast iron inside rubberized
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Rotor and shaft: stainless steel
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Stator: perbunan, natural rubber, neoprene, hypalon, silicon, buna, viton, polyethylene, polyamide, teflon etc.
Driver
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Electric motor, geared motor, infinitely variable gear, gasoline or diesel-engine by means of flexible coupling. V-belt drive and chain drive.
Direction of rotation
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CCW (if required CW in this case suction axial, discharge vertical upwards)
Bearing
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Two grease lubricated ball bearings in bearing housing. The rotor is connected by two cardan joints and the universal joint with the drive shaft rotates. The cardan joints are necessary so that the rotary motion of the driver can be transmitted to the rotor which is eccentrically located in the stator.
Suction lift
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max. 8 m (depending on medium and viscosity)
Type of construction
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The pump can be delivered as express cleaning model; as vertical submerged model, as block pump and in many other special designs.
For pumping extremely viscous, pasty or hardly pumpable medium or medium with a content of solid matter (up to 60 % drying agent) on the universal joint a screw conveyor is mounted transporting this very viscous medium into the handling elements to avoid failure.
Pumps' special features for use in oil and gas installations on and offshore
Flow rater
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starting from 0.1 l/hr (0.026 usgph) for precise dosing of liquids with accuracies of ±1 % Volumes of 350 m3/h (1542 usgpm) at speeds of approx. 350 rpm can be achieved e.g. for transporting drilling mud, crude oil, etc.
Pressure
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up to 144 bar (2088 psi) can be achieved e.g., Down Hole Pump used in oilfield installations for oil extraction
API 373
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pumps can be manufactured in accordance with API 676 "Rotary Positive Displacement" Pumps
