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How to Size an Air Compressor For Sandblasting

How to Size an Air Compressor For Sandblasting: Sandblasters are used to remove corrosion and paint off metal and other hard surfaces. Sandblasters may make sanding chores that seem hard surprisingly simple. If you utilise the proper compressor, you can obtain the greatest results from your sandblaster. You should be able to utilise these recommendations and advice to assist you select the best option for your project.

How to Size an Air Compressor For Sandblasting

Compressor Sizing

Sandblasters and compressors are sized according to:

  • The term “CFM” stands for “cubic feet per minute,” and it refers to how much air a system can move in one minute.
  • PSI (pounds per square inch) System pressure
  • Examine both sets of numbers to ensure that your compressor and sandblaster are compatible. The size of your compressor will be determined by the size of your sandblaster and nozzle.


A sandblaster works as follows.

If you understand how a sandblaster works, you can choose the appropriate size compressor for the task. Sandblasters use sand to smooth off uneven surfaces. Sand is fired at great speed from the sandblaster by an air-powered pressure gun. Sandblasters of various varieties are used for a variety of purposes. Different ones disseminate sand in various ways via the air.


  • Gravity-feed sandblasters feature a hopper on top of the pressure cannon. The hopper is pushed aside by the force of the air coming from the cannon. Sand is drawn into the hopper and pushed out of the barrel by the airflow.
  • A pressure blaster is a sandblasting cannon that already has a sand canister attached to it. The air and sand combine to force their way through the canister and into the rifle.
  • There are two hoses on a syphon sandblaster. The pressure generated by compressed air passing through the first pipe pulls sand from a storage tank and pushes it into a second pipe. Both air and sand are then ejected from the sandblasting cannon.
  • The compressor may produce more than one burst of air. The proper amount of pressure must be maintained. The quantity of air in your compressor should be sufficient for this. Because, You will be unable to complete the task if there is insufficient supply.


The size and performance of compressors

If you want your abrasive sandblasting procedure to go well, choose a tank that can withstand at least 100 pounds per square inch (PSI). The task will take much longer if you utilise a lesser PSI. It would take four times as long to complete the same amount of pressure cleaning work with half the blasting power. When it comes to speed, number trumps size every time. When the number of weapons in the cabinet is increased, more than 60% more work is completed.


How to Select the Correct Compressor Size and Nozzle

The size of your blast nozzle determines how much air you need and how much air you must conserve. The air compressor must move more cubic feet per minute as the nozzle size increases (CFM). You should also consider how much PSI is required for the work. When the PSI rises, so does the cubic feet per minute. You’ll need 20 CFM from your air compressor if you’re using a No. 2 nozzle at 100 PSI. If the same nozzle is utilised at 140 PSI, the CFM must be increased to 28.

Furthermore, Choosing the largest nozzle that will work for the project increases productivity. A #6, #7, or #8 model is recommended for blasting a large amount of sheet metal. Moreover, They measure between 0.3 and 0.5 inches in diameter. Hence, A #4 nozzle 3/16 inch long or a #5 nozzle 1/16 inch long will provide a more focused blast pattern on a more accurate task.

How to Size an Air Compressor For Sandblasting

Putting the puzzle pieces together

When sandblasting, there are several factors to consider. Check the manufacturer’s directions to ensure that the nozzle on your sandblaster is the correct size. In addition, Whatever sandblaster you choose, you’ll need a nozzle that can withstand the force. Additionally, Check the sandblaster’s CFM and PSI settings next. Compressors should be built larger to match the size of other machinery. You should use one of the following compressor sizes at 100 PSI:

  • 45 CFM for a 3/16-inch nozzle; 20 CFM for a 1/8-inch nozzle
  • At nozzle size 4, the flow rate is 81 cubic feet per minute (one-fourth of an inch)
  • 5/16″ (#5) Nozzle: 137 CFM
  • 196 CFM for the No. 6 with a 3/8-inch nozzle
  • The volume of airflow with a 7/16-inch nozzle at the #7 setting is 254 cubic feet per minute.
  • 1/2-inch #8 nozzle Equals 338 CFM
  • When working on a project that requires a greater PSI, it is critical to remember to update the compressor. If you are unsure how to use a tool, consult the instructions that came with it.

Any sandblasting task may be completed successfully with the correct compressor. Even though a compressor is a crucial equipment for the task, you should not feel obligated to get one for your company. You may be able to acquire the functionality you want without going bankrupt if you rent the necessary equipment.

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