Published: 17/07/2020
How to Choose the Best Industrial Air Compressor
Air compressors play a key role in both large industrial facilities and small-scale workshops. Compressed air is known as the ‘fourth’ utility alongside gas, electricity and water. Without it, many industrial operations would grind to a halt.
It’s always best to get expert advice on choosing the most suitable machine for your operations. With many different air compressor configurations on the market, how do you know which system is best for your business requirements?
Here’s a brief guide to help you make an informed choice on choosing the best industrial air compressor:
Different types of industrial air compressors
Rotary vane compressor
Rotary vane compressors feature a rotor fitted with sliding vanes inside a cylindrical chamber. As the rotor spins, the vanes move in and out, trapping air and compressing it.
This type is better suited for continuous use rather than intermittent operation as it is very reliant on high oil temperature to not ingress ambient moisture internally.
Rotary screw compressor
Rotary screw compressors uses two interlocking helical screws to compress air. As air enters the inlet, it becomes trapped between the male and female rotors. The space between the rotors decreases, which compresses the air before delivery to the factory.
These compressors run quietly, which makes them suitable for workplaces with noise regulations. They also provide a steady flow of air, so they’re often used in heavy-duty manufacturing plants and construction sites, again these are for continuous use rather than intermittent use for the same reasons as the rotary vane.
Reciprocating air compressor
Reciprocating (or piston) air compressors are one of the most common types on the market.
They work using a piston inside a cylinder, which is driven by a crankshaft. As the piston moves down, air is drawn into the cylinder through an inlet valve. And when it moves up again, the compressed air is forced through a discharge valve and into a storage tank, ready for use.
A reciprocating air compressor is best for occasional use and low-duty cycles, as the moist air does not come into contact with its lubrication oil.
Considerations when purchasing an air compressor
Choosing the right size of compressor
The size of the air compressor you need depends on your pressure and airflow requirements.
The compressor must meet the minimum pressure (PSI) needed to operate the specific machine. Compressors are generally BAR grouped as follows:
- Low-pressure (up to 8 BAR)
- Medium-pressure (8.5 BAR–13 BAR)
- High-pressure (above 13 BAR)
Airflow is equally important (the volume of air the system can deliver). If you have multiple machines that rely on compressed air, you need to consider whether they’ll be operating at the same time.
What’s the difference between a stationary and portable air compressor?
If you carry out your operational processes in one place, a stationary air compressor is the best choice for your business. You’ll typically find this type in factories and manufacturing plants where a high-powered air supply is required.
Portable air compressors, on the other hand, are on the smaller side and are fitted with wheels for mobility. They’re best for simple and quick jobs in workshops, which don’t require the high air output.
Do I need an oil-free or lubricated air compressor?
When it comes to choosing between an oil-free or oil-lubricated air compressor, it all depends on your specific industry regulations.
Oil-lubricated compressors use oil to grease up internal components as a means to keep the system cool. In industries where contaminant-free air is a non-negotiable, oil compressors are prohibited. This is because oil particulates can enter the storage tank and pollute the compressed air.
Oil-free compressors don’t rely on oil to reduce internal friction. Instead, they use specialised materials and coatings to achieve the same goal. Because they’re designed to produce 100% clean air, this compressor is widely used in food and healthcare environments.
Energy efficiency of the compressor
If your business is looking to reduce its carbon footprint and lower operational costs, it’s worth looking into air compressor energy efficiency.
Variable-speed drive compressors are far more energy-efficient than fixed-speed models. When air demand is lower, variable speed compressors adjusts its speed automatically depending on the required output.
Alternatively, look into how you can maximise your compressor efficiency, such as regular maintenance and improving system design.
Air Supply Ltd: The specialist compressor company
If you require high-quality air compressor products for your business, get in touch with the experts at Air Supply. We stock a variety of compressors, alongside ongoing repair and maintenance services with every purchase or rental. Get in touch with us today by emailing info@airsupply.co.uk or calling 01904 607050.