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  Two Spindle Screw Pump ( Series TD )  
 
 

TUSHACO Twin Screw pumps employ a unique principle that makes it the only choice for certain applications. No other design of Positive  Displacement Rotary pumps offer so much versatility in the operating parameters with guaranteed total reliability and maintenance-free service.

Working Principle

A pair of specially profiled screw, machined integral from solid stock and well supported on antifriction bearings run in precision bored interchangeable casing liners.Each screw set has one RH and one LH screw engaging with a similar but opposite hand screw pair.

A pair of hardened and profile ground timing gears synchronize the screws to maintain a small but positive clearance between the flanks thus ensuring no metal to metal contact. The pumps can therefore run dry for sometime without any damage. This unique feature enables to run the pump even dry and handle fluids that do not have enough lubricating value and also very low or high viscous products. Consequently, since there is no metal to metal contact; wear and tear is reduced to the minimum, ensuring extremely long service life. With two pairs of screws running in the same casing, the internal velocities are very small - consequently the NPSHR is practically the lowest even when the pumps run at motor speeds and while handling viscous products. Opposed screw pitches totally eliminate axial thrusts. Relatively small diameters of screws enables the pump to operate at high speeds directly coupled to prime movers - without the need for speed reducers even while handling high sealings always under suction pressure, thus making use of simple, inexpensive seals. The axial flow without turbulence, rotation, churning, chewing guarantees gentle handling of products. Noise and vibration or ---- levels are about the lowest. Positive clearance between running parts makes it easier to construct the pump in different materials safely, especially in stainless steel, without the fear of seizing. Thus a variety of fluids can easily be handled by selecting the right materials of construction.

TUSHACO PUMPS have earned a reputation of being the most reliable Positive Displacement Pumps for practically any given application since 1968 due to the widest choice of designs available and excellent knowledge of application engineering. Continuous Research and Development together with modernization with CNC machines and testing facilities has enabled us to accept challenging jobs. Thousands of TUSHACO pumps in operation to the total satisfaction of the users in core industries throughout the country and abroad are a silent testimony.

Salient Features

Positive clearance between rotors

Insensitive to varying viscosities

No metal to metal contact between rotors

Long maintenance free service

Dry running capability

Lowest NPSHR

Negligible wear over years

Shaft sealing at suction pressures

Axial smooth steady flow

Axial thrusts completely eliminated

High speed running

Interchangeable liner

Pulsation free output

Adaptability of various MOC

Negligible vibrations

 

Typical Parameters

Temperature: -30 to +350°C

Viscosity: 1cSt to 50,000 cSt or more

Pressure: Normal 16 bar/ 24bar, with special designs upto 50 bar

Specialties: Partial heating/ complete heating/ cooling arrangements

Sealing: Stuffing box/ mechanical seal with or without quenching/ heating/ cooling

Mounting: Horizontal foot mount/ vertical pedestal

Accessories: Relief valves, base frame, coupling, coupling guard, companion flanges, pressure gauges, electric motor/ diesel engines, variable speed drives and as per customer requirements.

Typical Applications

Loading / unloading of fuel oil and other products from: Railway wagon rakes, Truck tankers, Barges, Ships and Tankers.

Bulk cargo handling.

Lubrication, circulation and cooling.

Process pumping of high viscous products, bitumen, molasses, soap and similar products.

Long distance pipeline pumping of viscous products.

Typical Liquid List

Additives

Paraffin

Base oils

Petroleum products

Bitumen

Polyester

Fuel oils - all grades

Residues

Lubricating oils - all grades

Soap

Lyes

Vegetable oils

Molasses

 

Major Industries

Petroleum refineries, Terminals, Depots, Oil blending stations, Thermal power plants, Steel plants, Fertilizer industries, Petrochemical plants, Carbon black, Sugar, Paper and Pulp, Marine.

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