Two Spindle Screw Pump ( Series D2S)

Delta Twin Screw pumps work on 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.

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  • 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 right hand and one left hand 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 sealing’s 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.
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: 1 cSt to 50,000 cSt or more
  • Capacity: 20 to 500 m3/hr
  • Pressure: Normal 16 bar/ 24bar, with special designs up to 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 Soaps
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.

Company News

  • Delta successfully commissions pumps on the Coastguard 06-CG-OPV for 7 ships.
  • Delta gets approval from NTPC for screw pumps & gear pumps.
  • Delta completes export order for supply of pumps for 10 ships for leading European Shipyard.
  • Delta successfully replaces Chinese screw pumps for the critical fuel oil firing application in a UMPP.
  • Delta provides Bitumen Pumps with variable speed drive to HPCL refinery.