Air Compressors for Sale

How do Air Compressors Work?

An air compressor turns engine power into compressed air. The air is compressed into a tank and is then controlled by a pressure switch that automatically shuts off the motor when the maximum working pressure is achieved, measured in pounds per square inch (PSI). When used, compressed air is released from the tank to generate power. This continues until the pressure in the air compressor tank drops and a switch triggers the motor into operation, automatically filling the tank again.

Air compressors have several uses, such as spray-painting, tyre inflation, and nailing, stapling, sanding, drilling, cutting, grinding and air ratchets. The appropriate air compressor can be used not only in professional environments but also for many DIY projects around the home.

Here at SGS, you’ll find a selection of air fittings, hoses and accessories alongside a variety of DIY and professional-grade air compressors for sale, ready to use in the garage and workshop. Our range features several types of air compressors, including petrol/diesel options, portable devices and great-value air compressor and tool bundle deals for those looking for a complete solution in the UK

Calculating the CFM needed

Take the highest-rated cubic feet per minute (CFM) tool you wish to use and multiply by a factor of 1.25 to 1.5 to give the required CFM of the compressor. This multiplication will ensure the performance of your air compressor will be maintained without overworking the compressor and losing efficiency. If multiple tools are to be used simultaneously, add together the CFM requirements of each tool and multiply by a factor of 1.25.

Choosing a Tank Size

The capacity or size of the tank is closely tied to the performance of the air compressor. The size of the tank determines the amount of pressurised air that can be stored by the compressor. The air compressor will run until the desired pressure is reached within the tank. It will then shut off. When the tank pressure drops below the minimum limit, the pump reactivates. It’s not recommended to use the compressor while the pump is filling the tank, so a bigger tank allows for longer use of the pneumatic tool.

Performance measurements of a compressor

• The pressure produced at the tank, measured in PSI or bar
• The size of the tank
• The amount of air it can deliver in a set time (CFM or cubic feet per minute)

Required CFM for air tools