Choosing the Right Pressure for Your Air Tools
When an air tool isn't performing as expected, the first instinct is often to increase the pressure. While operating pressure is important, it's only part of the story.
A lot of the time, bad tool performance isn't caused by poor pressure, but by a lack of airflow or an undersized compressor.
Understanding Air Pressure
Most pneumatic tools are designed to work at a specific pressure, commonly around 90 PSI (6.2 bar). This pressure provides the force needed for the tool to function correctly.
Operating below the recommended pressure can result in: Reduced power, slower operation, or inconsistent performance.
Similarly, running a tool above its recommended pressure can lead to: Increased wear and tear (including internal components being damaged) and higher air consumption from your compressor.
This is why it is important to follow the manufacturer recommendations!
Why Pressure Isn't the Whole Story
A common misconception is that if a compressor can reach the required PSI, it can run any air tool.
In reality, air tools require both:
- Pressure (PSI or Bar) – the force of the air.
- Airflow (CFM or litres per minute) – the volume of air available.
This is like how the shower head works in your bathroom. Pressure decides how forcefully the water exits the hose, while flow determines how much water is available. You need both for a good shower, the same can be said for your air tools working well!
The Importance of Airflow
Many tools consume air faster than smaller compressors can supply it. For example:
- Brad nailers and tyre inflators use relatively little air.
- Impact wrenches require more airflow during operation.
- Die grinders and other equipment can consume high volumes of air continuously.
If a compressor can’t keep up with the tool's air demand, pressure will gradually drop during use. This means reduced performance even though the compressor may have been at the right pressure to begin with.
Signs Your Compressor May Be Too Small
If you experience any of the following, the issue may be airflow rather than pressure:
- Tools losing power during extended use
- Frequent pressure drops
- Compressor running constantly
- Inconsistent tool performance
If you have these issues, just increasing the regulator settings is not likely to solve the problem.
Choosing the Right Compressor
Here are the key things to look for when looking for a compressor to power your tools:
- Required operating pressure (PSI/Bar)
- Air consumption (CFM or litres per minute)
- Compressor delivered airflow
- Hose size and length
- Number of tools being used at one time
As a general rule of thumb, it's a good idea to choose a compressor with a higher airflow capacity than your tools require. This gives you a bit of breathing room and helps ensure the compressor can keep up during longer periods of use.
Overall, this can reduce wear on the compressor by preventing it from constantly working at its limits and repeatedly cycling on and off.
Air Receiver Tanks
These tanks are another option for those using tools that need short bursts of air, such as nail guns or impact wrenches. An air receiver tank can store extra compressed air, giving you a larger reserve than the compressor tank alone.
This means that if you don't want to upgrade to a larger air compressor, an air receiver tank could be an alternative to investigate. However, it's important to remember that an air receiver tank can only delay the drop in pressure if a tool requires a continuous air supply. It doesn't increase the compressor's output or create more pressure; it simply gives you more stored air to work with.
Final Thoughts
Setting the correct pressure is essential for safe and efficient operation of any air tool. However, pressure alone does not determine performance.
To get the best results, you’ll need a compressor capable of delivering sufficient airflow as well as the correct operating measure.
Choosing a compressor that matches the requirements of your tools can improve productivity and extend the life of your tools. Also, it can help reduce the stress that comes with using an underpowered air system.
References
Air compressor requirements for air tools: A comprehensive guide - Atlas Copco UK ExpertCornerTechGuide_airline-guide_is-your-air-tool-installation-right.pdf Air Flow Control | Air Receiver | Air Main Charging Systems