Recommended compressor output
0 CFM
Includes a 50% compressor reserve, as recommended by our technical team. Figures are engineering estimates based on typical nozzle air consumption - always confirm against your compressor's actual rated output before purchasing.
For a new operator, abrasive blasting can feel like a crash course in jargon – nozzle sizes, grit selection, PSI, CFM – all before the first trigger pull. Before you get lost in the finer details of your setup, it’s worth stepping back and getting the very first component right: the compressor. Get this wrong, and everything downstream – production speed, operator fatigue, even the quality of your surface finish – suffers for it.
Most people assume that a compressor with more pressure will blast faster. It’s an understandable assumption, but it’s not accurate. Pressure and volume are two different things, and for sandblasting, volume is the one that actually does the work.
It’s one thing for a compressor to produce pressure. It’s another thing entirely for it to maintain that pressure at the open end of a nozzle, under continuous load. That’s only possible if the compressor can supply enough air volume – measured in CFM (cubic feet per minute) or LPM (litres per minute) – to keep up with what the nozzle is drawing. A high-pressure compressor that can’t sustain volume will bog down the moment you pull the trigger, and your blast pressure – and your production rate – will drop with it.
So the real question isn’t “how much pressure can this compressor produce?” It’s “how much CFM can this compressor sustain?”
Before you get lost in the finer details of your setup, it’s worth stepping back and getting the very first component right: the compressor. Get this wrong, and everything downstream – production speed, operator fatigue, even the quality of your surface finish – suffers for it.
| Convert | Formula |
|---|---|
| BAR to PSI | BAR x 14.5 ≈ PSI |
| KW to HP | KW x 1.4 ≈ HP |
| HP to CFM | HP x 4 ≈ CFM |
| CFM to LPM | CFM x 28 ≈ LPM |
These are useful rule-of-thumb conversions, not a substitute for your compressor’s actual CAGI-rated output – always check the spec sheet where possible, since real-world CFM output varies by compressor design, altitude and condition.
As a rule of thumb, sandblasting pressure should never exceed 7 bar (roughly 100 PSI). Pushing higher doesn’t translate into meaningfully faster blasting – what it does do is tire your operator out faster. A fatigued blaster loses control of the nozzle sooner, which is both a safety risk and a productivity one. This is exactly why CFM, not raw pressure, is the number that should be driving your compressor choice.
This comes down to one factor above all: the size of your blast nozzle. The larger the nozzle orifice, the more air it needs to maintain pressure at the tip.
| Nozzle Size | Approximate CFM Required | Approximate LPM Required |
|---|---|---|
| 6.5 mm | ± 96 CFM | ± 2,688 LPM |
| 8 mm | ± 137 CFM | ± 3,836 LPM |
| 9.5 mm | ± 196 CFM | ± 5,488 LPM |
| 11 mm | ± 254 CFM | ± 7,112 LPM |
| 12.5 mm | ± 338 CFM | ± 9,464 LPM |
(Based on typical blasting pressure of around 7 bar / 100 PSI. As pressure requirements increase, so does the CFM draw – always size for the pressure you’ll actually be running, not just the nozzle diameter alone.)
Altitude matters here too. These figures assume sea-level conditions. At around 1,650m above sea level, thinner air can cut a compressor’s actual output by up to 17% – so if you’re working at altitude, factor that in before assuming a compressor’s rated CFM is what you’ll actually get on site.
Nozzle selection itself comes down to the blast pattern you need:
If your available compressor can’t reach the CFM in the table above, upsizing the compressor isn’t your only option. Our Low Pressure Blast Nozzles are built to deliver the same blasting performance and profile as a standard 7 bar nozzle, but at just 4-5 bar – using around 35% less air in the process. An 8mm nozzle, for example, needs roughly 137 CFM at 7 bar with a standard venturi nozzle, but only around 89-101 CFM at 4-5 bar with the Low Pressure version. For operations working within compressor limits, that difference can be the gap between needing a bigger machine and not. (Currently available in 8mm, 9.5mm and 12.5mm.)
| Nozzle Size | 4 Bar | 5 Bar |
|---|---|---|
| 8 mm | ± 89 CFM / 2,492 LPM | ± 101 CFM / 2,828 LPM |
| 9.5 mm | ± 126 CFM / 3,582 LPM | ± 143 CFM / 4,004 LPM |
| 12.5 mm | ± 224 CFM / 6,372 LPM | ± 252 CFM / 7,056 LPM |
The chart above tells you what the nozzle consumes at the tip – it doesn’t account for everything else pulling on your air supply. Before you settle on a compressor, factor in:
As a general rule, build in a 50% reserve on top of your calculated minimum. It’s a buffer against pressure drop, and it’s far cheaper than the productivity lost to an undersized machine.
Select your nozzle size and get a recommended compressor output instantly.
Recommended compressor output
0 CFM
Includes a 50% compressor reserve, as recommended by our technical team. Figures are engineering estimates based on typical nozzle air consumption - always confirm against your compressor's actual rated output before purchasing.
A correctly sized compressor is the foundation, but it’s only the first piece. From there, the rest of your setup needs to match it – the right blast nozzle, running through hose and couplings that won’t choke your air supply before it reaches the tip, and a blast pot sized correctly for the job. Browse our full range of sandblasting equipment – including options for dustless and dry blasting – to find the setup that fits together.
If you’re not sure where to start, our sales engineers are happy to help you match a complete setup to your application – get in touch here.
No. Beyond a certain point, extra pressure doesn’t add speed – it just tires the operator out faster. What actually determines blasting speed is whether your compressor can sustain the CFM your nozzle demands.
A nozzle around this size typically falls between the 9.5mm and 11mm range above – expect a requirement in the region of 196–254 CFM, depending on your operating pressure and line losses.
Not with a standard nozzle – you’ll get pressure drop, slower cutting speed, and inconsistent results. You do have two better options: downsize the nozzle to match your compressor, or switch to a Low Pressure Blast Nozzle, which delivers standard 7 bar performance at 4–5 bar using around 35% less air – often enough to keep your existing compressor in the game.
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