Rotary Screw Air Compressor Manufacturers in India

Rotary Screw Air Compressor 7.5 To 270 HP Lubricated

Main part of Screw Compressor is Air-end, consisting of a pair of rotors. The male motor is driven by electric motor. Suction of air though Inlet filter and suction control valve. Air – oil mixture from air-end flows into an air – oil separator. The separated oil flows through oil filter and after cooling in 'cooler', it gets back into the system. The air also passes through air cooler and to the receiver. The whole system is controlled through valves / sequence of compressor is done through electric /electronic control.

High Quality Compressors

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Rotary Screw Air Compressor Parts

Compact, High-efficiency, Low-noise:

  • Big Rotor, Big Output Capacity, Good Specific Power.
  • Stable Air Flow Volume, Less wear Parts than Piston Compressor, High Reliability

Low Investments:

  • Mechanical structure is simple, has low running cost and provides a continuous 24 hours operation

High Reliability:

  • Less moving parts. Integrated combination parts, Lower failure, high protection grade
  • Excellent quality compressed air, outlet compressed air oil content less than 3ppm, suitable for all main industry area

Fully Automatic Interlocking Control and Operation Management

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Intelligent PLC, with the signals of pressure, temperature, current provided with key important indicator of 12 alarms and full security protection measures, multi-language display suited for different countries requirement, maintenance period reminder, RS485 communications interface help realize linkage work for many compressors, concisely and comprehensively to let customer understand the running situation in a timely manner.

Safe Leakage-Proof Connection

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Safe Leakage-Proof Connection

Abandoned the traditional hose with low cost whole rigid line and flexible connection, put an end to bursting of ageing of pipeline causing leakage, reduce the oil pressure loss at the same time. Adopt cutting sleeve or ?uorine rubber o-rings for sealing which prevent leakage. Also, it helps reduce vibration effectively.

Intake Valve With Saving Energy

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Intake valve with high-quality and high reliability effectively control the loading and unloading of machine, saving energy. Sol.valve service life is up to 2 million times more than the structure used to upgrade, no gap can be completely sealed, no need air cylinder pneumatic control, no seal diaphragm etc. wearing parts.

Intake Valve

Electric control Components

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Electric Panel

Reliable electrical control components to ensure the long-term stable operation of units.

General Arrangement Diagram of Compressed Air System

Rotary Screw Air Dryer

Rotary Screw Small Range (7.5 To 30 Hp)

Technical Specifications

MODEL 7 BAR 8 BAR 10 BAR 13 BAR Motor Power HP Length MM Width
Air Conn.
M3/ MIN Delivery CFM M3/ MIN Delivery CFM M3/ MIN Delivery CFM M3/ MIN Delivery CFM
IAS 7.5 0.85 30 0.79 28 0.71 25 0.62 22 7.5 870 760 1120 286 ¾"
IAS 10 1.13 40 0.99 35 0.91 32 0.79 28 10 870 760 1120 292 ¾"
IAS 15 1.70 60 1.61 57 1.42 50 1.22 43 15 870 760 1120 351 ¾"
IAS 20 2.38 84 2.29 81 1.98 70 1.81 64 20 870 760 1120 489 ¾"
IAS 25 3.29 116 3.00 106 2.61 92 2.32 82 25 1470 1115 1175 504 1 ¼"
IAS 30 3.77 133 3.51 124 3.29 116 2.89 102 30 1470 1115 1175 517 1 ¼"
7 BAR M3/ MIN 0.85 1.13
7 BAR Delivery CFM 30 40
8 BAR M3/ MIN 0.79 0.99
8 BAR Delivery CFM 28 35
10 BAR M3/ MIN 0.71 0.91
10 BAR Delivery CFM 25 32
13 BAR M3/ MIN 0.62 0.79
13 BAR Delivery CFM 22 28
Motor Power HP 7.5 10
Length MM 870 870
Width MM 760 760
Height MM 1120 1120
Weight kg 286 292
Air Conn. ¾" ¾"
7 BAR M3/ MIN 1.70 2.38
7 BAR Delivery CFM 60 84
8 BAR M3/ MIN 1.61 2.29
8 BAR Delivery CFM 57 81
10 BAR M3/ MIN 1.42 1.98
10 BAR Delivery CFM 50 70
13 BAR M3/ MIN 1.22 1.81
13 BAR Delivery CFM 43 64
Motor Power HP 15 20
Length MM 870 870
Width MM 760 760
Height MM 1120 1120
Weight kg 351 489
Air Conn. ¾" ¾"
7 BAR M3/ MIN 3.29 3.77
7 BAR Delivery CFM 116 133
8 BAR M3/ MIN 3.00 3.51
8 BAR Delivery CFM 106 124
10 BAR M3/ MIN 2.61 3.29
10 BAR Delivery CFM 92 116
13 BAR M3/ MIN 2.32 2.89
13 BAR Delivery CFM 82 102
Motor Power HP 25 30
Length MM 1470 1470
Width MM 1115 1115
Height MM 1175 1175
Weight kg 504 517
Air Conn. 1 ¼" 1 ¼"

Rotary Screw Medium Range(40 To 125 Hp)

Technical Specifications

MODEL 7 BAR 8 BAR 10 BAR 13 BAR Motor Power HP Length MM Width
Air Conn.
M3/ MIN Delivery CFM M3/ MIN Delivery CFM M3/ MIN Delivery CFM M3/ MIN Delivery CFM
IAS 40 5.10 180 4.98 176 4.19 148 3.68 130 40 1470 1115 1175 610 1 ½"
IAS 50 6.46 228 6.29 222 5.81 205 5.30 187 50 1450 1600 1480 650 1 ½"
IAS 60 8.13 287 8.01 283 6.80 240 6.00 212 60 1850 1600 1480 1050 2"
IAS 75 10.39 367 10.00 353 8.50 300 7.59 268 75 1850 1600 1480 1250 2"
IAS 100 13.82 488 13.31 470 11.70 413 10.00 353 100 2340 1740 2000 1760 2 ½"
IAS 125 16.51 583 16.00 565 14.50 512 12.52 442 125 2340 1740 2000 1890 DN 65
7 BAR M3/ MIN 5.10 6.46
7 BAR Delivery CFM 180 228
8 BAR M3/ MIN 4.98 6.29
8 BAR Delivery CFM 176 222
10 BAR M3/ MIN 4.19 5.81
10 BAR Delivery CFM 148 205
13 BAR M3/ MIN 3.68 5.30
13 BAR Delivery CFM 130 187
Motor Power HP 40 50
Length MM 1470 1450
Width MM 1115 1600
Height MM 1175 1480
Weight kg 610 650
Air Conn. 1 ½" 1 ½"
7 BAR M3/ MIN 8.13 10.39
7 BAR Delivery CFM 287 367
8 BAR M3/ MIN 8.01 10.00
8 BAR Delivery CFM 283 353
10 BAR M3/ MIN 6.80 8.50
10 BAR Delivery CFM 240 300
13 BAR M3/ MIN 6.00 7.59
13 BAR Delivery CFM 212 268
Motor Power HP 60 75
Length MM 1850 1850
Width MM 1600 1600
Height MM 1480 1480
Weight kg 1050 1250
Air Conn. 2" 2"
7 BAR M3/ MIN 13.82 16.51
7 BAR Delivery CFM 488 583
8 BAR M3/ MIN 13.31 16.00
8 BAR Delivery CFM 470 565
10 BAR M3/ MIN 11.70 14.50
10 BAR Delivery CFM 413 512
13 BAR M3/ MIN 10.00 12.52
13 BAR Delivery CFM 353 442
Motor Power HP 100 125
Length MM 2340 2340
Width MM 1740 1740
Height MM 2000 2000
Weight kg 1760 1890
Air Conn. 2 ½" DN 65

Rotary Screw Large Range (150 To 270 Hp)

Technical Specifications

MODEL 7 BAR 8 BAR 10 BAR 12.5 BAR Motor Power HP Length MM Width MM Height MM Weight kg Air Conn.
M3/ MIN Delivery CFM M3/ MIN Delivery CFM M3/ MIN Delivery CFM M3/ MIN Delivery CFM
IAS 150 20.25 715 19.97 705 17.42 615 15.58 550 150 2340 1740 2000 2350 DN 65
IAS 180 24.5 865 24.0 847 21.0 741 18.00 635 180 2700 1750 1850 3100 DN 65
IAS 220 29.0 1024 28.3 1000 24.0 848 21.5 759 220 2700 1750 1850 3200 DN 65
IAS 250 32.5 1147 31.6 1116 28.3 999 24.5 865 250 2700 1820 1850 3450 DN 80
IAS 270 35 1236 33.6 1186 30.8 1088 27.2 960 270 2700 1820 1850 3600 DN 80
7 BAR M3/ MIN 20.25 24.5
7 BAR Delivery CFM 715 865
8 BAR M3/ MIN 19.97 24.0
8 BAR Delivery CFM 705 847
10 BAR M3/ MIN 17.42 21.0
10 BAR Delivery CFM 615 741
12.5 BAR M3/ MIN 15.58 18.00
12.5 BAR Delivery CFM 550 635
Motor Power HP 150 180
Length MM 2340 2700
Width MM 1740 1750
Height MM 2000 1850
Weight kg 2350 3100
Air Conn. DN 65 DN 65
7 BAR M3/ MIN 29.0 32.5
7 BAR Delivery CFM 1024 1147
8 BAR M3/ MIN 28.3 31.6
8 BAR Delivery CFM 1000 1116
10 BAR M3/ MIN 24.0 28.3
10 BAR Delivery CFM 848 999
12.5 BAR M3/ MIN 21.5 24.5
12.5 BAR Delivery CFM 759 865
Motor Power HP 220 250
Length MM 2700 2700
Width MM 1750 1820
Height MM 1850 1850
Weight kg 3200 3450
Air Conn. DN 65 DN 80
7 BAR M3/ MIN 35
7 BAR Delivery CFM 1236
8 BAR M3/ MIN 33.6
8 BAR Delivery CFM 1186
10 BAR M3/ MIN 30.8
10 BAR Delivery CFM 1088
12.5 BAR M3/ MIN 27.2
12.5 BAR Delivery CFM 960
Motor Power HP 270
Length MM 2700
Width MM 1820
Height MM 1850
Weight kg 3600
Air Conn. DN 80

What is a screw type air compressor?

Indo-Air’s rotary screw air compressors serve as the backbone of a wide range of industrial applications. The principle of the rotary screw air compressors are made from high-end designs, innovative features, and technologies to provide cost-effective, long-lasting, dependable, and premium compressed air solutions for light to heavy-duty industrial applications.

Rotary screw air compressors are high-efficiency rotary positive displacement machines that can operate at high speeds over a wide range of operating pressures and flow rates. There are no valves or other mechanical forces that can induce unbalance in screw air compressors. This permits a compressor to run at high speeds while delivering a huge flow rate in a tiny package. The fundamental benefit of employing a rotary screw air compressor is that it can continuously produce compressed air with little delivery pressure fluctuations and generates less heat than traditional air compressors, resulting in energy efficiency.

How does a screw type air compressor work?

Within the casing of a rotary screw air compressor, two interlocked helical rotors rotate in opposite directions. Ambient air is drawn into the compressor and circulated through the intended valve, where it is confined between the two helical rotors. As the screws turn, the pressure rises as the air volume decreases. Inside a rotary screw air compressor, Lysholm screws can be found.

Air compressors, in many circumstances, will have the full power of two screws, which is necessary for many large-scale productions. Some rotary screw air compressors only have one screw and are only used for refrigeration in rare cases.

What is the working principle of the rotary screw air compressor?

The rotary screw compressor is one of the most extensively used technologies in modern industrial machinery. Screw compressors are the workhorse behind many industrial processes and applications, thanks to their dependability and versatility. This long-lasting technology is well-suited to a variety of demanding industry operations, without which organisations all over the world would face operational difficulties and inefficiency.

In air compressors, there are two primary compression concepts. The principle of positive displacement is one of them. This technology is used by a variety of compressors, the most common of which being screw compressors.

Operating Principles

A set of male and female rotors are located within the compressor. They'll be built differently such that when they're all twisted at the same time, air gets trapped between them. The male rotor features convex lobes, while the female rotor has concave chambers, allowing them to mesh without touching and achieve compression. As the male rotor has fewer lobes than the female, it will rotate faster, thus driving the female rotor. Unlike piston compressors, which use the same compression concept, the screw element does not have valves. As a result, it can operate at high shaft speeds without causing instability due to mechanical or volumetric losses. Screw technology may therefore combine a high flow rate with a small, space-saving design.

What are the benefits of rotary screw air compressors?

Screw compressors, being the technology of choice for a wide range of reciprocating compressor applications, have a lot to offer customer including:

Continuous operation - They don't need to be turned on and off, and they don't have a duty cycle because they can provide continuous airflow and pressurisation. This implies they can run indefinitely with little to no downtime.

Easy to maintain - Wear and tear are minimised because there are very few moving and contacting parts. Long service intervals save maintenance expenses and make routine inspections and repairs simple, quick, and painless.

Powerful performance - Screw compressors have high airflow rates and can perform at extreme temperatures, allowing them to operate in difficult environments. This implies they can readily and efficiently operate pneumatic tools and big equipment.

Energy-efficient - These long-lasting machines emit less heat and use less energy than other models since they have endured the test of time. Because of these design qualities, there is no capacity decrease over time, lowering the compressor's lifetime cost.

Low noise - The quiet operation of the devices is due to their tiny size and absence of moving parts, making them ideal for point-of-use installations.

Are screw compressors better?

To understand which one is better, the following comparison can be helpful - Screw air compressor -

  • A constant supply of air
  • Increased duty cycle
  • Better long-term durability
  • Increased overall effectiveness
  • Reduced background noise
  • Airflow per rated power is higher.

Reciprocating air compressor -

  • Extremely high pressure demands
  • Spare parts management
  • Reduced duty cycle

What is the difference between the reciprocating compressor to a screw type compressor?

The mechanism by which Rotary Screw Air Compressors and Reciprocating Air Compressors compress air differs significantly.

Their distinguishing characteristics can be summed up as follows:

System design

For compressing the input air, rotary screw air compressors use a pair of meshing spiral screws known as rotors. For compressing the air, reciprocating air compressors use pistons that are moved by a crankshaft.

Components involved

Screw air compressors are not vulnerable to significant wear and tear because they only have two moving parts (screws) with a little space between them. Even in versions where the two screws come into contact with one another, there is little friction, therefore they are less prone to break down. Reciprocal air compressors, on the other hand, contain more moving parts, such as pistons, piston rings, connecting rods, and inlet-outlet valves, which makes them noisier and necessitates spare parts storage.


Screw air compressors generate between 80 and 99 degrees Celsius of internal heat during use. Because there is no friction between the screws, heat production is reduced. With the help of a thermostatically controlled fluid circuit, the oil or lubricant employed between the rotors and casing forms a non-wearing seal that can eliminate the heat. The pistons of reciprocating air compressors operate at temperatures ranging from 150 to 200 degrees Celsius. The friction created by the movement of piston rings against the cylinder walls causes the high temperatures.

Oil filtration

Because this machine features a three-stage oil filtering system, the chances of finding leftover oil in an oil-lubricated screw air compressor are quite slim. Typically, the oil concentration is less than three particles per million (PPM).

However, because a reciprocating air compressor lacks an oil filtration mechanism, the air it produces can be more contaminated than that produced by a screw air compressor. When piston rings and oil rings deteriorate, oil can flow up to the compression side, increasing the oil concentration in the air.

Air-receiver tanks

When using a rotary screw air compressor, determining the right size of an air-receiver tank might be difficult because most of the connected applications don't require one. This machine is designed to deliver a constant stream of compressed air with no pulsation or interruption. You won't need a tank if the airflow needs of your tool is smaller than what the air compressor can provide. Piston-based compressors, on the other hand, have air-receiver tanks that store air and reduce pulsation before running the linked applications. Once the tank is filled, the equipment can be used.

Industries that use rotary screw air compressors

Screw compressors are used by many industries to increase their daily production capacity. Due to their strong design diagram and lack of a duty cycle, they are well-suited to heavy-demand industrial activities. Manufacturing sectors such as automotive, brewing, food packaging, aerospace, construction, beverage, and textile all benefit from screw air systems. Because they can withstand a wide range of working circumstances, they are appropriate for both small and large-scale operations as well.

Rotary screw air compressors are driven by two counter-rotating screws. They're usually quieter and more effective than piston engines. Rotary air compressors are utilised when huge amounts of high-pressure air are required on a daily basis for around 8 hours. Rotary screw air compressors also have extended lifespans, making them an excellent long-term investment. Because there is no metal-to-metal contact, there is less wear. Finally, these systems are generally easy to maintain.


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Common questions we get asked about air compressors with our replies.
Trouble shooting questions are answered on another page, there links to other popular air compressor related pages to the right.

The atmospheric air enters the compressor at atmospheric pressure and leaves it as a high pressure at low volume gas . This process can be done by Piston or by Rotary.

All process in indusries can not be done with atmostpheric pressure hence air is required to compress so that process can be been done.

volume of 0.818 m3; or 1 lb of air a volume of 13.07 ft3.

  • Causing leakages causing facrors like rust and scale deposits in steel pipes
  • Any resistance
  • Improper selection of pressure controling devices in the system
  • Moist in electro-magnetic controls
  • Freezing of moisture in pneumatic conveying system
  • Inaccurate moving parts

  • To reduce the running costs
  • Easy maintenance at low costs
  • Quick operation

  • Humidity
  • Dust particles
  • Oil mixed during the process by the compressor
  • Gases, Vapours, Fumes.
  • Bacteria/Viruses

Dew point can be defined as the temperature at which air is fully saturated and below which water will condense.

Compressed Air can be dried by two methods -

  • Refrigeration
  • Sorption
Refrigeration:- When the temperature of the air is lowered, its ability to hold moisture is reduced. A refigeration dryer reduces the dewpoint of the air by reducing the temperature of the air, thus separating moisture.
Sorption:- The air stream passes over a bed of granular desiccant which in its active state has a vapour pressure below the vapour pressure of air stream to be dried and therefore physically removes the moisture from the air stream. Sorption can be classified into Absorption and Adsorption.
Absorption:- Absorption systems use a desiccant that dissolves with the absorbed moisture. The desiccant cannot be regenerated.
Absorption:- Adsorption dryers operate by passing compressed air through a bed of desiccant material, to which the water vapour is adsorbed.. These desiccants once saturated can be regenerated and reused.

Hot, moist air enters the refrigeration dryer through an air to air heat exchanger, where the temperature of the inlet air is reduced. This cooled air now passes through a refrigerant to air to air heat exchanger where the tempe¬rature of the air is reduced to between 2° to 5°C The cooling induces condensation and the liquid water is removed in a liquid seprator. The dry air now goes out of the dryer through the air to air heat exchange where the temperature of the air is increased to slightly below the incoming air. This is a continuous process.

The dewpoint cannot go below 2°C PDP.

There are several different types of regenerative dryers but they all conform to the same basic concept. A regenerative dryer consists of two towers filled with the desiccant. The desiccant in one bed is on stream, drying the air, while the desiccant in the other tower is being regenerated. The two towers are interlinked with switching valves so that when the desiccant in the drying tower is saturated, the valves switch the flow into the tower that has just been regenerated. This switching operation is automatic giving conti¬nuous drying.

With an adsorption dryer, very low dewpoint, down to -40°C or -60°C can be achieved.

  • Silica Gel
  • Activated Alumina
  • Molecular Sieve

  • For general plant air, dewpoints of 2°C to 4°C are considered sufficient,
  • Refrigeration type dryers use less energy and hence are lower in first and operating costs.

Our Products

Experts in the field of engineering for the compressors & vacuum pumps industry

Booster Compressor
Booster Compressor 10 To 40 HP Reciprocating

Indo-Air pressurizes the air entering the compressor at 7-13 bar up to 40 bars with the IBH series booster air compressors in its production range.

Rotary Screw Compressor
Rotary Screw 7.5 To 270 HP Lubricated

Main part of Screw Compressor is Air-end, consisting of a pair of rotors. The male motor is driven by electric motor. Suction of air though Inlet filter and suction control valve.

Oil Free High Pressure Compressor
Reciprocating Oil Free High Pressure Water-Cooled 40 To 215 HP

The search for a reliable 100% Oil Free quality air has prompted INDO-AIR to come out with totally engineered, tested and high performance range of compessors.

Oil Free High Pressure Compressor
Oil Free Medium Pressure Water Cooled 30 To 215 HP

The search for a reliable, 100% oil free quality air has prompted Indo-Air to introduce a totally engineered, tested and high performance range of compressors.

Reciprocating Low Pressure Air Compressor
Reciprocating 1 To 20 HP Single-Stage Low Pressure

INDO-AIR Single-stage air compressors are designed for low pressure application. These compressors have cylinders of same size (regardless of the number of cylinders).

Reciprocating Medium Pressure Air Compressor
Reciprocating 2 To 30 HP Two-Stage Medium Pressure

INDO-AIR Two - stage air compressors are designed for medium pressure application and are made of heavy-duty components to give optimum performance.