Correct operation depends on actual available flow, pressure and air quality. Check air delivered at the machine connection, not only compressor specifications. At 7 bar, indicative injector requirements are 340 l/min for 6 mm, 640 l/min for 8 mm and 780 l/min for 10 mm. Compare these with actual available flow. A larger injector passes more air. Without adequate supply, its performance cannot be fully used. At 7 bar, indicative nozzle requirements are 1,300 l/min for 5 mm, 2,300 l/min for 6 mm and 4,300 l/min for 8 mm. Demand increases sharply with nozzle diameter. High airflow carries and accelerates abrasive directly through the nozzle, providing greater delivery and removal capacity. Correctly size the pneumatic installation. Pipe diameter and length, fittings, valves and restrictions can reduce flow and working pressure. Assess supply at the machine connection. Pressure can drop during blasting, reducing jet continuity and effectiveness despite sufficient nominal compressor pressure. Moisture and condensation can clump abrasive and interrupt feeding. Provide suitable drying and condensate management. It reduces moisture before air reaches the machine. Drying complements correct line sizing. Compare actual flow with the system, injector or nozzle and operating pressure. Many applications run around 5.5–6 bar, consuming less than the indicative 7-bar figures. Balance the machine, injector or nozzle, working pressure and supply for the required process and productivity. How much air does Venturi blasting use? How much air does pressure blasting use? Must the machine run at 7 bar? Why dry the air?
Why is compressed air important?
How much air does a Venturi machine use?
Why does injector diameter affect consumption?
How much air does a pressure machine use?
Why does pressure blasting require more air?
Is the compressor sufficient?
What happens with too little air?
Why must compressed air be dry?
What does an air dryer do?
How should air supply be assessed before choosing a machine?
Why assess machine and installation together?
FAQ – Frequently asked questions
🎯 At 7 bar, approximately 340, 640 and 780 l/min for 6, 8 and 10 mm injectors.
🎯 At 7 bar, approximately 1,300, 2,300 and 4,300 l/min for 5, 6 and 8 mm nozzles.
🎯 No. Many processes run around 5.5–6 bar, according to component and finish.
🎯 Moisture can clump abrasive and cause irregular feeding or blockages.