How to Choose the Right Air Compressor for Your Business
Choosing the right air compressor is an important decision for any business that relies on compressed air.
The correct compressor can provide a reliable air supply, improve efficiency and help keep running costs under control.
With so many types and sizes available, choosing the right machine can seem complicated. Here are some of the key factors to consider.
1. Determine Your Air Requirements
The first step is to understand how much compressed air your business actually needs.
Consider:
- What pneumatic tools and equipment will be running?
- How much air does each item require?
- Will several machines operate at the same time?
- Is your air demand continuous or intermittent?
- Are you likely to expand your system in the future?
Compressor output is usually measured in CFM or m³/min, while pressure is measured in bar. When comparing compressors, pay particular attention to Free Air Delivery (FAD) rather than simply looking at motor size.
Choosing a compressor that is too small can result in low pressure and excessive running, while an unnecessarily large compressor can increase purchase and energy costs.
2. Choose the Right Type of Compressor
The two main types used in many businesses are piston compressors and screw compressors.
Piston Compressors
Piston compressors are often suitable for smaller workshops and applications where compressed air is required intermittently. They can be ideal for garages, maintenance work, air tools and smaller pneumatic applications.
Screw Compressors
Screw compressors are designed for businesses with a more regular or continuous demand for compressed air. They are widely used in manufacturing, engineering, automation, packaging and other industrial applications.
If your compressor will be running for much of the working day, a screw compressor may provide a more suitable and efficient solution.
3. Fixed Speed or Variable Speed?
If you’re considering a screw compressor, you may also need to decide between fixed speed and variable speed.
A fixed-speed compressor runs at a set speed and can work well where air demand remains relatively consistent.
A variable speed compressor (VSD) automatically adjusts its output to match demand. This can make it particularly suitable for businesses where compressed air requirements fluctuate throughout the day.
For applications with varying demand and long operating hours, a variable speed compressor can help reduce energy consumption and improve efficiency.
4. What Pressure Do You Need?
Most industrial compressed air systems operate around 7–10 bar, but the correct pressure depends on the equipment being supplied.
Check the pressure requirements of your pneumatic equipment and remember to consider pressure losses through filters, dryers and pipework.
Running a system at a higher pressure than necessary can also increase energy consumption, so the aim should be to provide the required pressure without unnecessarily increasing it.
5. Do You Need an Air Receiver or Dryer?
An air receiver stores compressed air and helps provide a buffer when demand increases. It can also help stabilise pressure and reduce unnecessary compressor cycling.
Depending on your application, you may also require a compressed air dryer. Moisture naturally forms when air is compressed and can cause corrosion, contamination and damage to pneumatic equipment.
If your application requires clean, dry air, the appropriate combination of compressor, receiver, dryer and filtration should be considered as part of the overall system.
6. Consider Energy Efficiency
The purchase price isn’t the only cost to consider when choosing a compressor. Energy can represent a significant proportion of the lifetime cost of running a compressed air system.
Look at:
- Motor efficiency
- Fixed or variable speed operation
- Compressor output
- Operating pressure
- Duty cycle
- Maintenance requirements
A more efficient compressor may cost more initially but could provide significant savings over its working life.
7. Don’t Forget Maintenance
Regular compressor servicing helps maintain performance, efficiency and reliability while reducing the risk of unexpected downtime.
It’s also worth checking your existing compressed air system for air leaks before deciding that you need a larger compressor. Leaks can waste energy and cause pressure problems, forcing your compressor to work harder than necessary.
Air System Controls provides compressor servicing, repairs and compressed air leak detection to help businesses keep their systems operating efficiently.
Which Compressor Is Right for Your Business?
There is no single compressor that suits every application. The right choice depends on your:
Air demand + pressure + duty cycle + air quality + available space + future requirements
As a general guide:
| Application | Compressor to Consider |
|---|---|
| Small workshop or garage | Piston compressor |
| Intermittent air demand | Piston or fixed-speed compressor |
| Regular industrial use | Screw compressor |
| Long operating hours | Screw compressor |
| Variable air demand | Variable speed screw compressor |
| Clean, dry compressed air | Compressor with suitable dryer and filtration |
Need Help Choosing a Compressor?
At Air System Controls, we supply a wide range of piston and screw compressors, including fixed-speed and variable-speed models, receiver-mounted systems and compressor packages with integrated dryers.
We can also assist with compressed air system design, installation, servicing, repairs and leak detection.
If you’re unsure which compressor is right for your business, contact our team and we’ll help you find a solution suited to your application and air requirements.