Single Stage Reciprocating Low Pressure Air Compressor

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

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). Robust, overhung design crankshaft for reliability & easy maintenance, solid end connecting rods, high thermal efficiency, inter-cooling, reliable splash lubrication and balanced V-type construction for smooth, vibration-free operation.

Factors to consider in an Air Compressor

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Factors to consider in Air Compressor
  • How often the compressor is used and how it is used.
  • Short list in-plant compressed air application. Make a list of equipment in the plant Consuming compressed air and expected air flow requirement in ‘CFM’ and the required pressure in ‘PSI’
  • Consider the duty cycle of your compressors as most compressors are not meant to run all the time.
  • Decide on the size/capacity of the tank. The more use of equipments means the need for larger tank. Choosing a larger tank than the need will ensure optimum use of the Compressor.
  • Consider 10% more capacity compressor to compensate the air misuse or leaks and pressure drop in the system.
  • Decide on the continuous run style or start-stop style compressor. ( A compressor that runs continuously, but only compresses air as per demand or a compressor that fills the tank and stops until low pressure signals a start).
  • Consider the accessory which is to be installed with each compressor.
  • Other like maintenance, life expectancy, trouble shooting (also know the manufacture network/ regional offices), repair costs, etc.

Standard Scope of Supply for Complete Package

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  • Bare compressor
  • Air Suction Filter
  • Air Receiver
  • Receiver Fittings like: Safety Valve, Pressure Gauge, Service Valve, Drain Valve, Pressure Switch / Auxiliary Valve
  • ASSC / CSC Regulation
  • V-belts & Belt Guard
  • Motor Pulley & Motor Slide Rail
  • Motor & Starter
Supply for Air Compressor

Optional Accessories

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Air Compressor Accessories
  • Receiver – vertical or loose supply
  • Drive : Motor or Engine
  • Pre filter & After filter : For oil removal purpose
  • Air Dryer : For dry or moisture free air – Refrigerated; Heatless Air Dryer
  • Air Dryer : Condensate Drain Trap : Automatic Type
  • Low Oil Level Switch
  • Sound Enclosures : For low noise
  • Control Panel – for centralized control & display of parameters
  • Compressor also available as : Base Plate Mounted – Portable, Tailor- made package

Single Stage Low Pressure Compressors ( 2 - 8 Kg/cm2 )

Technical Specifications

MODEL MOTOR NO. OF
CYL.
RPM RECEIVER MAX. PRESSURE PISTON DISPL
HP KW CFT. LTRS. PSIG KG/CM2 CFM M3/M LTR/MIN
IA 31 1.0 0.75 1 600 2.50 70 125 8.78 4.12 0.117 117
IA 32 2.0 1.50 2 600 3.55 100 125 8.78 8.25 0.234 234
IA 33 3.0 2.20 2 960 5.30 150 125 8.78 13.75 0.389 389
IA 161 1.0 0.75 1 600 2.50 70 125 8.78 4.00 0.110 110
IA 265 2.0 1.50 2 460 5.30 150 80 5.62 10.35 0.293 293
IA 265 3.0 2.20 2 675 5.30 150 80 5.62 15.18 0.430 430
IA 274 5.0 3.70 2 660 7.95 225 80 5.62 26.50 0.750 750
IA 274 7.5 5.50 2 865 7.95 225 80 5.62 34.64 0.980 980
IA 285 7.5 5.50 2 505 8.83 250 80 5.62 40.00 1.130 1130
IA 285 10.0 7.50 2 660 8.83 250 80 5.62 52.50 1.485 1485
IA 37S 10.0 7.50 2 750 10.80 300 60 4.21 68.10 1.928 1928
IA 37S 12.5 9.30 2 900 10.80 300 60 4.21 81.75 2.315 2315
IA 37S2 12.5 9.30 2 800 10.60 300 40 2.81 88.00 2.490 2490
IA 45S 15.0 11.00 3 700 17.66 500 60 4.21 95.40 2.700 2700
IA 45S 20.0 15.00 3 900 17.66 500 60 4.21 122.65 3.470 3470
IA 45S2 20.0 15.00 3 850 17.66 500 40 2.81 140.15 3.969 3969
MODEL IA 31 IA 32
MOTOR HP 1.0 2.0
MOTOR KW 0.75 1.50
NO. OF CYL. 1 2
RPM 600 600
RECEIVER CFT. 2.50 3.55
RECEIVER LTRS. 70 100
MAX. PRESSURE PSIG 125 125
MAX. PRESSURE KG/CM2 8.78 8.78
PISTON DISPL CFM 4.12 8.25
PISTON DISPL M3/M 0.117 0.234
PISTON DISPL LTR/MIN 117 234
MODEL IA 33 IA 161
MOTOR HP 3.0 1.0
MOTOR KW 2.20 0.75
NO. OF CYL. 2 1
RPM 960 600
RECEIVER CFT. 5.30 2.50
RECEIVER LTRS. 150 70
MAX. PRESSURE PSIG 125 125
MAX. PRESSURE KG/CM2 8.78 8.78
PISTON DISPL CFM 13.75 4.00
PISTON DISPL M3/M 0.389 0.110
PISTON DISPL LTR/MIN 389 110
MODEL IA 265 IA 265
MOTOR HP 2.0 3.0
MOTOR KW 1.50 2.20
NO. OF CYL. 2 2
RPM 460 675
RECEIVER CFT. 5.30 5.30
RECEIVER LTRS. 150 150
MAX. PRESSURE PSIG 80 80
MAX. PRESSURE KG/CM2 5.62 5.62
PISTON DISPL CFM 10.35 15.18
PISTON DISPL M3/M 0.293 0.430
PISTON DISPL LTR/MIN 293 430
MODEL IA 274 IA 274
MOTOR HP 5.0 7.5
MOTOR KW 3.70 5.50
NO. OF CYL. 2 2
RPM 660 865
RECEIVER CFT. 7.95 7.95
RECEIVER LTRS. 225 225
MAX. PRESSURE PSIG 80 80
MAX. PRESSURE KG/CM2 5.62 5.62
PISTON DISPL CFM 26.50 34.64
PISTON DISPL M3/M 0.750 0.980
PISTON DISPL LTR/MIN 750 980
MODEL IA 285 IA 285
MOTOR HP 7.5 10.0
MOTOR KW 5.50 7.50
NO. OF CYL. 2 2
RPM 505 660
RECEIVER CFT. 8.83 8.83
RECEIVER LTRS. 250 250
MAX. PRESSURE PSIG 80 80
MAX. PRESSURE KG/CM2 5.62 5.62
PISTON DISPL CFM 40.00 52.50
PISTON DISPL M3/M 1.130 1.485
PISTON DISPL LTR/MIN 1130 1485
MODEL IA 37S IA 37S
MOTOR HP 10.0 12.5
MOTOR KW 7.50 9.30
NO. OF CYL. 2 2
RPM 750 900
RECEIVER CFT. 10.80 10.80
RECEIVER LTRS. 300 300
MAX. PRESSURE PSIG 60 60
MAX. PRESSURE KG/CM2 4.21 4.21
PISTON DISPL CFM 68.10 81.75
PISTON DISPL M3/M 1.928 2.315
PISTON DISPL LTR/MIN 1928 2315
MODEL IA 37S2 IA 45S
MOTOR HP 12.5 15.0
MOTOR KW 9.30 11.00
NO. OF CYL. 2 3
RPM 800 700
RECEIVER CFT. 10.60 17.66
RECEIVER LTRS. 300 500
MAX. PRESSURE PSIG 40 60
MAX. PRESSURE KG/CM2 2.81 4.21
PISTON DISPL CFM 88.00 95.40
PISTON DISPL M3/M 2.490 2.700
PISTON DISPL LTR/MIN 2490 2700
MODEL IA 45S IA 45S2
MOTOR HP 20.0 20.0
MOTOR KW 15.00 15.00
NO. OF CYL. 3 3
RPM 900 850
RECEIVER CFT. 17.66 17.66
RECEIVER LTRS. 500 500
MAX. PRESSURE PSIG 60 40
MAX. PRESSURE KG/CM2 4.21 2.81
PISTON DISPL CFM 122.65 140.15
PISTON DISPL M3/M 3.470 3.969
PISTON DISPL LTR/MIN 3470 3969
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FAQs

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.

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