What Size of Compressor Do I Need?

Understanding the flow and pressure (a.k.a. cfm and psi) requirements for your facility is key when choosing an air compressor. Pressure and flow are two very common terms used when discussing compressed air systems.

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Pressure can be measured in pounds per square inch (psi), or bar (metric measure of pressure). To think of this in simpler terms, pressure refers to the amount of force needed to perform certain amount of work at any given point in time. A simple example of pressure and how it works, is to imagine moving a wooden block across a table. In the illustration below, it shows that using 75 psi of compressed air is not enough force to move the block, but 100 psi of pressure has the ability to move the wooden block the desired distance.

The air compressor has to provide enough pressure to perform a given task (in this case it was to move a wooden block). Per illustration below, if 100 psi is required to move the block, anything less than that will not accomplish the task. It is important to understand what pressure is needed in order to size the compressor properly, otherwise you will be faced with problems, similar to illustration below where lower pressure was not able to move the wooden block, or perform the job.

Whether you lead a construction team or perform home repairs, air compressors are an ideal power source. Compressors use energy from pressurized air to power air tools, with the correct size compressor making all the difference in your task&#;s efficiency, productivity, and cost-effectiveness.

It&#;s important to assess your job requirements, including the best air pressure, airflow and duty cycle you&#;ll need, to help you choose the right size compressor. Continue reading to learn more about compressor sizes and how to find the right one for your project.

What to Consider When Selecting an Air Compressor

Air compressors come in many sizes, but size alone does not determine how powerful they will be. For this reason, you&#;ll need to assess your tools&#; air requirements to find the right size. Consider the following points to determine how big of an air compressor you need for your project:

• Required air pressure: Determine the maximum air pressure rating (PSI) needed for your tools and equipment. A smaller PSI might be suitable for general-purpose tools, while a larger PSI might be used for demanding applications like sandblasting.
• Airflow: Before considering the correct physical size of the air compressor, assess how much air it delivers, measured in cubic feet per minute (CFM). Look at the CFM rating for the most demanding tool you use, which typically ranges between 10 and 110. To determine the correct air compressor size, consider the highest-value air pressure and air delivery requirements of your tools. Choose an air compressor that exceeds the air pressure value by 1.5 to get the correct CFM for optimal, safe use.
• Duty cycle: An air compressor&#;s duty cycle is the amount of time it can run without overheating, often expressed as a percentage. For example, a 100% duty cycle means the compressor will deliver consistent CFM and PSI while you&#;re using it. You&#;ll need a higher CFM rating if you don&#;t want to stop running the compressor regularly.
• Portability: Decide whether you&#;ll need a portable or stationary compressor for your specific job requirements. While a stationary air compressor will have a higher CFM for heavy-duty applications, a portable one offers greater flexibility, allowing you to easily move around job sites.
• Physical dimensions and storage space: When choosing the right size compressor for air tools, consider the amount of storage space you have and the size of the tank on the compressor. You&#;ll also need to keep a few feet of space around the compressor when using it for proper airflow.
• Power source: Determine if an electric, diesel, or gas-powered compressor is more suitable for your task. Electric motors are often more affordable and require less maintenance, while gas air compressors can be better for flexibility and portability.

Compressor Sizes and Capacities

To select the right air compressor capacity and size, consider the following CFM ratings. Note that your air tools&#; CFM and PSI ratings will impact how quickly the compressed air is consumed. Larger air tools will use more air and deplete the tank supply faster.

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• Small-scale compressors (1-5 CFM): Smaller compressors are ideal for light-duty tasks like small airbrushing jobs, inflating tires, or operating pneumatic nail guns.
• Medium-scale compressors (6-20 CFM): A medium-scale compressor is best suited for tasks like roofing, framing, or powering paint sprayers.
• Large-scale compressors (20+ CFM): These compressors are ideal for heavy-duty tasks like sandblasting, industrial painting, powering machinery in industrial settings, and operating large pneumatic tools like rock drills, jackhammers, and large impact wrenches.

These sizes and capacities offer a general guideline for selecting an air compressor based on your task and the requirements of the tools you&#;re using. Match the compressor size to your specific job demands for efficient operation, and choose a compressor that exceeds the rating on your strongest air tool. If you&#;ll be running many tools at once, add their CFM ratings to find the correct size compressor.

What Size Air Compressor Do I Need for Tools Like Air and Nail Guns

Air compressors have a variety of uses and are ideal for construction, automotive and industrial applications. For example, construction projects will require a compressor size that matches the demands of staplers, pneumatic nail guns and smaller air tools.

In industrial settings, larger compressors are useful for jobs like sandblasting and spray painting. Automotive workshops will require compressors that meet the needs of impact wrenches, paint sprayers and inflating tires.

Common compressor sizes for air tools include:

• Brad nailer: A small-scale compressor, such as 1-2 CFM and 70-90 PSI, is best for Brad nailers. The compressor is suitable for intermittent use in woodworking and trim work.
• Finish nailer: For finish nailers, choose an air compressor around 1 to 2.5 CFM and 70-120 PSI. Depending on how often you use it and the specific nail size, you might use a small- to medium-scale compressor.
• Staple gun: A staple gun can be operated by small-scale compressors around 1-5 CFM for light-duty upholstery and carpentry jobs.
• Impact wrench: This tool often requires a medium-scale compressor of around 6-20 CFM when used for automotive work, construction, and heavy-duty fastening tasks.
• Paint sprayer: The right air compressor size for painting will be around 8-12 CFM. It will offer consistent, smooth painting for many jobs, such as automotive projects.
• Spray gun: While you may find air spray guns with a rating lower than 10 CFM, it&#;s best to choose a compressor that is at least 12 CFM. You might use a higher CFM depending on the torque requirements and how long you intend to use it. For instance, professional-grade finishes in woodworking or automotive painting would require a large-scale compressor of over 20 CFM.
• Sandblaster: The typical air compressor size for sandblasting is around 18-35 CFM. An industrial sandblaster is more demanding, requiring 50-100 CFM.

Rent Air Compressors From Thompson Power Systems

The right size air compressor can help you accomplish tasks at optimal performance, boost your efficiency, and lead to higher cost savings. When choosing an air compressor, it&#;s important to consider factors like your tools&#; CFM, duty cycle, air pressure, and power source.

If you&#;re unsure about what you need for your projects, Thompson Power Systems can help you select the right portable air compressor. Our experts can help you assess your options while offering easy delivery and fast installation, so you can get the exact air compressor you require when you need it.

We offer reliable diesel, electric, and high-pressure compressed air rental solutions for many tasks, no matter how complex or urgent.  Contact us today to rent an air compressor or locate your nearest representative for an in-person appointment.

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