FAQ: How much compressed air do I need to run my sand blast machine?
Tuesday, August 12th, 2008Q: How much compressed air do I need to run my sand blast machine?
A: This questions comes up a lot and the answer depends on several variables.
1. What size nozzle is going to be used.
2. What blast pressure will be required.
3. What size the blast hose is.
4. How far is the compressor from the location of the blasting.
The larger the blast nozzle and/or the higher the blast pressure used, the higher the air volume requirement. If the blast nozzle diameter is reduced, the air volume requirement will be reduced since it will take less air to maintain pressure through the smaller nozzle. Likewise, if the blast air pressure is reduced it will reduce the air volume requirement through the same size blast nozzle.
The following chart will provide a general idea of the volume of air required to operate the listed nozzle sizes at the pressures indicated.
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CFM CONSUMPTION
NOZZLE VENTURI PSI
NO. SIZE 25 30 35 40 45 50 60 70
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CFM
4 1/4 in. 28 32 37 41 45 49 56 61
5 5/16 in. 44 50 57 64 70 76 88 101
6 3/8 in. 63 73 82 91 100 109 126 143
7 7/16 in. 85 99 112 124 137 149 172 194
8 1/2 in. 112 129 146 163 179 194 225 252
