Examples of the use of a compressor: a guide for the workshop and production

TL;DR:

• The right choice of compressor depends on the specific use and the requirements for pressure and flow.
• Oil-free compressors are ideal for clean, precise work such as airbrush or the food industry.
• For industry it is important to dimension the output and the air receiver correctly, which influences energy costs and the service life of the equipment.

Compressors are among the most universal tools in a trade, in industry and in a home workshop. The right choice of compressor directly influences the efficiency of the work, the costs of operation and the resulting quality. Yet many craftsmen and workshop operators choose a compressor only according to the price or the output on the label, without knowing the specific requirements of their applications. This article brings an overview of practical scenarios from inflating tyres through automated production lines to airbrush and modelling, complemented by specific recommendations for every case of use. On the basis of compressors for ordinary use it is clear that the choice of the right type significantly eases everyday operation.

Contents

• The most frequent examples of the use of a compressor in a trade and at home
• Industrial deployment: production, automation and energy savings
• Compressors in the automobile industry: essential support for service and production
• Special and small-scale applications: small workshops, airbrush and creative use
• What we often forget when choosing and using a compressor
• Choose a compressor with confidence thanks to our expert advice
• Most frequent questions and answers

Key findings

The most frequent examples of the use of a compressor in a trade and at home

Compressors find use in a whole range of practical situations. Every application places specific requirements on the output, pressure and cleanliness of the air. Knowing these requirements in advance saves time as well as money.

An overview of the main areas of use

The most widespread applications in trade and home practice include these categories:

• Inflating tyres: A standard requirement in every car workshop and garage. The working pressure ranges between 2.0 and 3.5 bar. A compressor with an output from 100 l/min and an air receiver of 24 litres is enough.
• Blowing off dust and cleaning: An air gun removes dust from electric motors, filters, milling heads and tool cabinets faster than any vacuum cleaner. A pressure of 4 to 6 bar and a flow of 50 l/min are sufficient.
• Painting and spraying: A pneumatic spray gun ensures an even application without brush marks. The key parameter is a stable flow of air, usually 150 to 250 l/min at a pressure of 3 to 4 bar.
• Driving pneumatic tools: Staplers, nailers and impact wrenches require short pulsed doses of air. The tools consume 100 to 400 l/min depending on the type.
• Airbrush and hobby use: Fine modelling work or decorative painting requires a pressure of 1 to 3 bar and above all clean, dry air without oil mist. That is why oil-free compressors are the clear choice for this application.
• Garden use: Inflating the wheels of garden machinery, cleaning filters and garden tools.

For a home workshop with several applications an air receiver of at least 50 litres is recommended, so that frequent switching of the motor does not occur. For construction professionals with heavy pneumatic tools large-volume compressors with a receiver volume from 200 litres upwards are suitable.

Professional tip: When choosing a compressor for several different tools always dimension the output according to the tool with the highest flow of air, not according to the average consumption. Underestimating the output leads to drops in pressure, overheating and a shorter service life of the motor.

The choice between an oil and an oil-free compressor also plays a fundamental role. Oil compressors provide higher outputs and a longer service life, but the air can contain oil vapours unsuitable for the food industry or precise spraying. Oil-free variants produce clean air, but tend to be noisier and less powerful in continuous operation.

Industrial deployment: production, automation and energy savings

In production halls and industrial plants compressed air is considered the fourth energy alongside electricity, water and gas. A central distribution of compressed air supplies pneumatic cylinders, assembly lines, packaging machines and paint booths.

Key industrial applications

• Driving pneumatic cylinders and robotics: Industrial robots and automated lines use pneumatic cylinders for fast and precise movements. The working pressure tends to be 5 to 8 bar, the flow depends on the number of cylinders and the cycle time.
• Central distribution of compressed air: One screw compressor can supply a whole production hall. Screw compressors work continuously at a stable pressure and are suitable for continuous operation, unlike piston ones which work in cycles.
• Pneumatic conveyors: Compressed air transports bulk materials, granulate or tablet products in piped distribution without mechanical moving parts.
• Cleaning moulds and workpieces: In mechanical engineering blowing is used for the fast removal of chips, emulsion and impurities from workpieces directly on the line.
• Laser and CNC machining centres: Air cooling of the spindles and removal of chips are a standard part of modern machining centres.

The influence on energy costs is fundamental. Compressed air is energy-intensive: producing 1 m³ of compressed air at 7 bar consumes approximately 0.1 kWh of electrical energy. That is why efficiency in production and the right dimensioning of the system can reduce the annual costs by tens of thousands of crowns. Modern frequency-controlled screw compressors automatically adapt their output to the current consumption and achieve savings of 20 to 35 % compared with compressors with fixed revolutions. More on the topic is offered by the expert overview of energy savings in industry.

A comparison of outputs and industrial applications

The right choice of the type of compressor for industry depends on cyclical or continuous operation, the requirements for the quality of the air and the total consumption. Incorrect dimensioning causes frequent switching, overheating and unnecessary losses of energy.

Compressors in the automobile industry: essential support for service and production

Car repair shops, paint shops and vehicle manufacturers cannot do without compressors. It is the basis of the equipment of every professional service.

An overview of automotive applications and the required output

Pneumatic jacks make the safe lifting of vehicles with a mass up to 5 tonnes possible with a considerably lower physical effort of the operator. Vehicle manufacturers then use compressors for driving assembly tools on the lines, where pneumatic solutions offer the advantage of a low weight and easy regulation of the tightening torque.

The correct procedure when working with a compressor in a car service

1. Before starting work check the pressure in the tank and set the regulator to the value required by the tool.
2. Connect the hose with a quick coupling correctly certified for the given pressure.
3. When painting check the water and oil separator, and replace the filter element if necessary.
4. After finishing work drain the condensate from the air receiver, especially in the winter months.
5. Check the state of the hoses, seals and accessories after every working shift.

Professional tip: For a paint shop always choose a compressor with an output of at least 1.5 times the maximum consumption of the gun. Fluctuation of pressure causes an uneven application and a higher consumption of paint. An oil-free compressor or an additional coalescing filter is a necessity for quality painting.

Safety comes first in a car service. Compressors must meet the valid standards and certifications. Detailed information about what to follow is offered by the safety rules in the service. Overpressure safety valves, regular inspections of pressure vessels and the correct marking of the pressure system are not optional extras, but legal requirements.

Impact wrenches are standard in a modern service. They work at a pressure of 6 to 8 bar and a tightening torque of 600 to 2000 Nm. For one impact wrench a compressor with an output of 250 to 350 l/min is enough; for a larger service with several stations the output has to be added up and a reserve of 20 % added.

Special and small-scale applications: small workshops, airbrush and creative use

A compressor is not exclusively an industrial or trade tool. In smaller workshops, studios and specialised plants it finds use in a whole range of specific applications.

Airbrush and creative work

The airbrush technique requires a stable pressure in the range of 1 to 3 bar, a minimal flow of air and above all absolutely clean, dry air without oil vapours. Oil impurities would damage the paints as well as the surface of the model or decoration. For these purposes oil-free compressors are the only right choice.

Areas of use of the airbrush technique:

• Modelling: Painting figures, models of cars, ships and aircraft. The precise pressure and the possibility of stepless regulation are key.
• Decorative painting: Customisation of helmets, decoration on glass and wood, graffiti with an aerosol effect.
• Food industry: Decoration of cakes and confectionery products with food-based colours. The cleanliness of the air is here a hygienic necessity.
• Textiles and footwear: Application on fabrics, leather and synthetic materials for production or alterations.

Small-scale plants and pressure tests

Smaller producers of plastic or metal parts use compressors for driving assembly tools, blowing and pneumatic conveyors at a low capacity. A specific use are pressure tests of vessels, piping and fittings, where compressed air or nitrogen is fed into the tested part and the drop in pressure is followed. This method is more accurate and cheaper than a hydraulic test with smaller diameters.

Oil-free compressors with an output of 100 to 200 l/min are the optimal choice for precise creative work and small-scale production. They provide clean air, low vibrations and quiet operation suitable also for enclosed spaces.

When working with airbrush and other precise applications it is recommended to avoid the most frequent mistakes in using compressors, such as insufficient filtration of the air, excessive or conversely insufficient pressure and neglect of draining the air receiver.

The key advantages of oil-free compressors for precise work:

• Air without oil mist and contaminants
• Quieter operation, typically below 60 dB(A)
• Lower demands on regular maintenance (no change of oil)
• Suitable for enclosed rooms and studios
• Lower weight and easy portability

What we often forget when choosing and using a compressor

The output of the compressor stated on the label (power input in kW or nominal output in l/min) is not the only figure which decides the suitability for a specific application. Experience shows that a number of craftsmen and smaller businesses choose a compressor according to this single parameter and only in operation find out that the equipment is not sufficient.

It is fundamental to know the real operating cycle of the tools and equipment. An impact wrench consumes a large quantity of air in a short pulse, while a spray gun requires a constant flow throughout the whole time of spraying. Both devices can have the same nominal consumption, but place completely different demands on the air receiver and the output of the compressor.

The correct dimensioning of the air receiver is just as important as the output of the compressor. Too small a receiver causes the motor of the compressor to run almost continuously, which shortens its service life and increases energy consumption. The general rule says that for intermittent operation the receiver should have a volume of at least ten times the flow of air per minute.

The impacts of an incorrect choice on energy costs are marked. Details are offered by an overview of the efficiency of an electric compressor. An investment in a compressor with a higher output and a better-quality design as a rule pays back within two years thanks to a lower energy consumption and minimal service costs. Consultation with a specialist before purchase is a specific and measurable saving, not an optional extra.

Choose a compressor with confidence thanks to our expert advice

At Kompresory-vzduchotechnika.cz you will find a complete range for all the described applications.

From small oil-free compressors for airbrush and home workshops to powerful screw and piston machines for industry and car services, we offer compressors for professionals with technical support and advice. If you are looking for a specific output and capacity, take a look at powerful variants of compressors with a power input from 4 kW upwards, suitable for demanding operating conditions. Our specialists will help with dimensioning, the choice of accessories and the assessment of operating costs, both for a one-off purchase and for the complete equipping of a plant.

Most frequent questions and answers

What type of compressor to choose for a home workshop?

For ordinary work at home a small, oil-free compressor with an output of 100 to 250 l/min and an air receiver of 24 to 50 litres is enough, which will manage the inflation of tyres, cleaning and a stapler.

Can the same compressor be used for inflating tyres and for airbrush?

Yes, but it is necessary to follow the requirements for the cleanliness and pressure of the air, because airbrush requires oil-free air and precise regulation of pressure, which oil compressors without additional filtration do not ensure.

How often is it necessary to carry out maintenance of a compressor?

Basic maintenance is recommended after every larger period of operation, while the check includes the state of the filters, draining the condensate from the air receiver, checking the oil with oil types or the state of the membranes with oil-free ones.

What safety aspects should be followed when working with a compressor?

It is important to use exclusively certified accessories corresponding to the maximum working pressure, to observe the pressure limits of the system and to carry out regular inspections of the pressure vessel according to the valid standards.

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