"TUSHACO" - a leading name in the field of Positive Displacement Rotary pumps since 1968 introduced for the first time in India the concept of "Three Screw Pumps" already in 1970's. Foreseeing the growing demand for totally reliable fuel and lube oil pumps for Thermal and Hydel Power Plants, Fertilizer, Chemical and Steel Projects a beginning was made by importing critical components and building pumps locally. Over decades, thousands Three Screw pumps have been manufactured and delivered. Valuable experience gained and modern manufacturing and testing facilities established under joint collaboration from world-renowned German company.
Today TUSHACO is undisputed leader not only in Three Screw pump technology but equally in the other types - namely Twin Screw, Single Screw/ Progressing Cavity - as well as the conventional types like Shuttle Block, Internal Gear, External Gear, Trochoidal and Vane types. This unique position, combined with years of Application Engineering expertise and knowledge of Process Engineering requirements offers direct benefit to customers by the right choice of the pump design selection for almost any given duty parameters.
TUSHACO pumps are on the OEM list of practically all major plant and equipment manufacturers, consulting organizations and has met with approvals from third party inspection agencies - national and international.
Reliable performance of thousands of TUSHACO Three Screw pumps in India and overseas - over decades is the silent testimonial of the hard and dedicated efforts behind this success. Working Principle
TUSHACO Three Screw pumps employ just three screw elements - one power screw and two idler screws running in the three precision bores in the housing or liner. The screws are so profiled that they form a liquid tight seal between the thread. 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 reducing the friction. The idlers simply roll over the root diameter of idler dia.reduce the unit pressure, centralize the power rotor and absorb the radial loads. A balance piston integrally machined on power rotor takes care of 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 3000 or 3600 RPM motors or other prime movers. Such unique design and features has demonstrated excellent reliability with pumps in operation continuously non-stop for decades together without replacement of any components or maintenance on clean fluids.
High speed capability
Long service life
Insensitive to viscosities
High pressure capability
Axial flow - no churning, chewing or shearing
Excellent suction capability
Smooth pulsation free flow
Hydraulic balancing of forces eliminates need for any bearings
Low noise and vibrations
T 3S FP
T 3S L
T 3S N
T 3S M
T 3S H
Figures given are indicative for range only considering speeds upto 2900 RPM.
Three screw pumps can run to speeds upto 10000 RPM under special conditions.
+ Higher viscosities can be handled upto 50, 000 cSt or more.
* Higher temperatures upto 250°C can be handled with special execution.
Fuel Oil Service:
Fuel oil burner service for Thermal Power Plant/ Industrial Package, Boilers, Furnaces, Kilns and Combustion systems.Fuel transfer and booster service for Captive Diesel/ Gas Turbine Plants and Industrial Combustion Systems, Fuel Oil Circulations and Centrifuge Feeding. Tank farm tank to tank transfers. Hydraulic Duties :
Hydraulic governing service for Water Turbines, Inlet Penstock Valves.
Low and medium pressure hydraulic applications, high pressure jacking oil service for rotor lifting for Turbines/ Compressors/ Alternators. Lubricating Duty :
Pressure lubrication and cooling of bearings for Turbo Machinery, Gear Boxes, Bearing Lubrication of Coal Mills, ID/FD Fans, Diesel Engines, Steel Rolling Mills, Air pre-heater guide bearings, Compressors. Seal Oil Service :
Hydrogen cooled Generators, Gas and Refrigeration Compressors.
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.
Positive clearance between rotors
Insensitive to varying viscosities
No metal to metal contact between rotors
Long maintenance free service
Dry running capability
Negligible wear over years
Shaft sealing at suction pressures
Axial smooth steady flow
Axial thrusts completely eliminated
High speed running
Pulsation free output
Adaptability of various MOC
Temperature: -30 to +350°C
Viscosity: 1cSt to 50,000 cSt or more
Pressure: Normal 16 bar/ 24bar, with special designs upto 50 bar
The very first pump produced by TUSHACO in 1968 was an Internal Gear Pump Model R-1-G for low-pressure burner service - till this day it is in production with great success. Subsequently only TUSHACO had the foresight to introduce several other exotic designs, to take care of growing industrial demands, thus placing themselves on the forefront in the field of Rotary Positive Displacement Pumps. Experience gained over years in designing and building Rotary Pumps combined with knowledge in Application Engineering has resulted in this development of New Stainless Steel Internal Gear Series specifically for food, chemical and pharmaceutical industry. Computer aided designs, CNC in-house machining facilities and sophisticated test beds, together with TUSHACO dedication made instant success of the New Internal Gear "IG" series from day one.
Innovation, simple construction has ensured very easy maintenance and totally reliable hassle free installation. A glance at the reference list of scores of pumps delivered for New Food Processing and Industrial projects within a short period is a silent testimony for TUSHACO performance. Working Principle
TUSHACO IG series employs proven Internal Gearing (Gear within Gear) principle for pumping. The main gear is keyed to the drive shaft, and rotates concentric in the pump casing. Idler is located on an eccentric pin on the front cover to rotate freely and meshes with main gear when assembled. A crescent shaped partition precision machined on the front cover maintains a small, but positive clearance to achieve perfect scaling between parts. As the gears come out of mesh, a partial vacuum is created, forcing the fluid to rush into the pump casing and fill in the voids between the teeth. Both gears rotating in the same direction of rotation gently transfer the fluid to the delivery port. The resulting action is a smooth-steady flow; low in pulsation, noise and vibration.
Single shaft design well supported on outboard bearing (except for one inside sleeve bearing) enables to pump products even with poor lubricating value unlike in the external gear pumps. External bearing construction offers easy access the pump components i.e., rotor set and even pump casing simply by removing the front cover without disturbing drive parts, bearings etc., and in place. Block pump mounted integrally on hollow shaft gearbox automatically reduces the speed (in several ratios) and enables even the pump rotor to be pulled out without disturbing the drive! It is easily possible to jacket front and rear covers for products heating - thus making the design unique and versatile - ideally suited for process pumping.
Built-in reducer offers ideal speed range 240~960 RPM
Single sealing, external bearing
Slow speeds ensure better pumping & longer life
Low noise and pulsation
The IG series is modular developed with excellent interchangeability. The pump is available either as bracket mounted 'BM' or gearbox mounted 'GM" models. The bracket mounted casing construction provides stress free operation while handling products at higher temperatures. The major components are casing, front cover, rear cover, seal box (casing parts) and rotor set (rotor, idler and shaft). Most casing components are made by lost wax process for better finish and grain structure.
'GM' version offers a choice of different speed ratios, making it easy to handle viscous products besides eliminating problems of alignment, extra set of coupling. Standard 4 pole or 6 pole motors can be directly coupled to such units making it very reliable, compact and clean drive. Another unique feature is the adjusting clearance between rotor set and cover by means of rotor positioning device enabling to restore pump capacity even after wear and tear after a long use.
Pumps can be equipped with Heating/ Cooling Jacket on front cover/ rear cover and in some cases also Pump Housing. Choice of Mechanical Seal/ Stuffing box is available for shaft sealing.
Unique pumping principle - a combination of Rotary and Piston pump- two double acting pistons in their respective cylinders at right angles to each other.
Rotation of rotor causes reciprocating movement of shuttle and piston.
Single shaft design with long sleeve-bearing support and external ball bearing.
Single gland construction reduces leakage to minimum.
Choice of Mechanical seal and oil seals available.
Specially designed for transfer applications.
Front pull out design permits inspection of parts without disturbing the pipe connection, couplings or prime mover.
Slow speed operation contributes to high reliability and less maintenance.
Product is pumped without shear, foaming, agitating, heating, emulsifying or chewing.
Pumping elements are of simple geometric form. Parts can be manufactured locally in any part of the world by a small repair shop.
Micrometer Axial shaft position device permits controlled clearance between rotor face and cover. Even after long use wear can be compensated by simple adjustment at site without disturbing pipe line or motors.
Pump can be supplied in partial or full heating arrangement.
Pumps available with built in relief valve.
from 250 lpm to 970 LPM
Upto 6 bar
from 1 cSt to 30,000 cSt
Fuel oil transfer, loading and unloading
Edible oil transfer
Tank to tank transfer in process plant.
For all cases involving viscosities higher than 200 cSt
Very economical and costs fraction of the cost of gear, vane or screw pumps
Power consumption is less than conventional pumps
Simplest of all Positive Displacement Pumps
Most compact for any given capacity compared to other Positive Displacement Pumps
Field maintenable. (In-situ repairs permitted !)
For further details refer to catalogues as well as liquid list as well as application list.
Tushaco progressing cavity pump is a positive displacement rotary pump. The actual pumping elements of the pump are rotor and stator. The single helical rotor rolls eccentrically in a double threaded helix stator of twice the pitch length. A series of sealed cavities 180° apart are created that appear to progress from suction to discharge during one rotation of rotor.
The opposing cavities fill and empty simultaneously resulting in a pulsationless flow.The fluid travels axially with relatively low velocity and minimal agitation.The stator is made of a resilient elastomeric material and bonded to the stator tube. The important feature of the pumping principle is the ability to handle slurries and solid particles. The elastomer stator also permits passage of solid particles due to elastomeric deformation. The compression fit of the rotor and stator enables the Tushaco progressing cavity pumps to handle gaseous and low viscosity liquids. The pressure capabilities of the pump are a function of the number of cavities. Tushaco progressing cavity pumps are available in a wide variety of materials - cast iron or stainless steel wetted parts and 10 standard elastomer materials. Tushaco versatile progressing cavity pumps are rugged, compact and highly efficient.
Fluids, which are delicate, shear sensitive or abrasive, low or high viscosity, with fibres, with high air content, or large solids, can be conveniently handled by Tushaco progressing cavity pumps.
Sturdy drive design provides strength for rigorous continuous operation.
Unique pivot-joint design extends service life and reduces replacement cost.
Close coupled models with built-on speed reducers offer compact pumping unit.
Stators are available in a wide range of elastomers.
Suction lift to 28' w.c. (Water column)
Possible drive arrangements include:
Direct drive with motor
Through gear box
Variable speed drives
Special drives such as hydraulic, with I.C. engines.
5 to 2700 lpm
6 to 24 bar
from cryogenic to 120°C
1 to 100,000 cp
Typical Industries, Applications & Fluids
Transfer Service Sampling
Polymer Feed Dewatering Sludge Transfer
Effluent with & without solids, Milk of Lime
General Sewage Slurry, Media
Centrifuge Charging, Transfer, Filter Charging
Kiln Charging Drainage, Metering, Tank Loading/ Unloading