Large, high production jobs or coatings that are difficult to remove require 300 CFM or greater. Compressors in the 115 – 185 CFM range are ideal for small to medium-sized applications. Small jobs with detailed work or easy to remove coatings require 185 CFM or less. Second, a higher pressure allows you to use a blasting nozzle with a larger inside diameter, which puts more abrasive on the surface per unit of time.Īir compressors are sized by how many cubic feet per minute (CFM) of air they compress. First, a high pressure increases the velocity of the abrasive media, delivering more kinetic energy and creating a deeper anchor pattern. This increases the production rate for two reasons. The greater the amount of air volume that is compressed per minute, the greater the pressure in the blasting system. The air compressor collects air at atmospheric pressure and compresses it into a smaller volume at a higher pressure. Each has a role to play, and the requirement or selection of one affects the others. There are three important components to a wet abrasive blasting system: the air compressor, the blast hose, and the blast nozzle. The closer the blast nozzle is to the surface to be cleaned, the greater the impacting force and the smaller the blast pattern. A certain stand-off distance might be required for safety reasons to protect personnel, or it might be influenced by the workspace’s physical conditions, such as nearby objects that restrict access to the surface. Typical blast pressure (in psi) required for various applications.Īnother consideration is the stand-off distance, which is the length between a blasting nozzle and the surface being cleaned. White metal blast to near white metal blast Some general guidance in the form of Table 1 is helpful to gain a starting point. The first question to answer is what blast pressure is required to prepare the surface effectively.
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How to Determine the Correct Blast Pressure for Your Application Being able to fine tune the blast pressure is of immense benefit when removing strongly adhered coatings from delicate substrates because the substrate can be damaged when the coating is removed. Wooden materials (e.g., decks) can be cleaned by vapor abrasive blast cleaning if the blast pressure is low enough to prevent damaging the wood fibers.
The material makeup of the substrate and the substrate’s condition should also be considered. Conversely, a lower pressure is sufficient for easy-to-remove coatings or loose dirt. Tough, thick coatings, corrosion, or strongly adhered surface contaminants require a higher blast pressure. Read: What is Wet/Vapor Abrasive Blasting Why Blast Pressure MattersĮach job is unique and requires forethought to achieve the best results.
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