DUPLEX SCREW PUMP
	Range
	a) Capacity upto 1000 M3 / HR b) Temperature upto 3500 C c) Viscosity upto 50000 cSt d) Pressure upto 24 bar

Salient Features
Adaptability of various MOC.	Lowest NPSHR.
Axial smooth steady flow.	Negligible vibrations .
Axial thrusts completely eliminated	Negligible wear over years.
Dry running capability	No metal to metal contact between rotors.
High speed running ..	Positive clearance between rotors.
Insensitive to varying viscosities.	Pulsation free output.
Inter changeable liner.	Shaft sealing at suction pressures.
Long maintenance free service.

Working Principles

A pair of specially profiled screws, machined integral from solid stock and well supported on anti friction 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 & profile ground timing fears 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 viscosities. The flow patterns of fluid through the pump keeps the (shaft) 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.

Application
1) Carbon Black	4) Marine	7) Petrochemical Plants	10) Terminals
2) Depots	5) Oil Blending Stations	8) Petroleum Refineries	11) Thermal Power Plants
3) Fertilizers	6) Paper and Pulp	9) Steel Plants	12) Water Treatment Plant