Atlas Copco air compressors in Scotland

An air compressor converts power from an electric motor or engine into compressed air. It draws in atmospheric air, compresses it, stores or delivers it at pressure and releases it through downstream controls.

• The compression chamber raises air pressure.
• Outlet valves and regulators control delivery pressure.
• Filters, separators and dryers remove moisture or impurities before use.

Compressed air is used across manufacturing, automotive, construction, food and beverage, pharmaceutical, healthcare, aerospace, electronics and energy applications.

• Manufacturing: pneumatic tools, actuators and material handling.
• Automotive: impact wrenches, paint sprayers and tyre inflation.
• Food and beverage: clean air for packaging, processing and cleaning.
• Pharmaceutical and healthcare: medical devices, dental tools and cleanroom processes.
• Energy and utilities: pneumatic controls and combustion air support.

Sizing depends on the total air consumption of every tool or process that may run at the same time, plus the duty cycle and pressure required. Common tool guide ranges include:

• 1/2-inch impact wrench: 4-8 CFM.
• 3/4-inch impact wrench: 8-12 CFM.
• Air drill: 3-8 CFM depending on chuck size.
• Dual-action air sander: 10-12 CFM.
• Paint spray gun: 7-12 CFM.
• Blow gun: 3-8 CFM.

These figures are approximate. Design Air can survey demand and help specify the right compressor and receiver arrangement for the actual site.

Screw compressors provide continuous, pulsation-free airflow and are well suited to industrial applications with higher or continuous air demand. Piston compressors are often a lower-cost option for intermittent demand.

• Screw compressors usually offer higher airflow in a compact package.
• They tend to be quieter and better suited to continuous operation.
• Piston compressors can be practical for smaller workshops or intermittent tasks.

A fixed-speed compressor is suited to stable and predictable demand. A VSD compressor adjusts speed to match changing air demand, which can reduce energy consumption and maintain tighter pressure control on variable-load sites.

• Fixed speed: simple, predictable and cost-effective when demand is steady.
• VSD: more flexible and efficient when demand varies.
• Cost decision: VSD usually costs more upfront but can reduce operating cost over time.

Oil-free pros: cleaner air, no oil carryover risk and good fit for sensitive environments. Oil-free cons: often shorter lifespan, more heat management and potentially lower efficiency than oil-lubricated alternatives.

Oil-lubricated pros: longer lifespan, quieter operation, better heavy-duty suitability and strong efficiency. Oil-lubricated cons: possible oil contamination risk in applications that require oil-free air.