What happens to blasting speed when air pressure drops by 20 PSI?

Abrasive particle velocity is directly driven by air pressure. Dropping from 100 PSI to 80 PSI reduces stripping production speed by approximately 30%. Operating at 60 PSI cuts productivity by more than half.

Why should I never use standard 3/8-inch air hose for sandblasting?

High CFM flows through narrow 3/8" hose create severe dynamic friction loss, causing a 15 to 25 PSI pressure drop between your compressor tank and the blast gun. Always use 3/4" or 1" smooth-bore dedicated blast bull hose.

What is the difference in air consumption between pressure pots and siphon cabinets?

Siphon / suction cabinets must use compressed air to both create a vacuum to suck media up a siphon tube AND project it out the nozzle. Pressure pots pressurize the media tank, consuming 25% to 30% less air for 3 times faster cleaning.

Free Sandblasting Nozzle CFM & Air Pressure Calculator

💨 Nozzle & Operating Pressure

Blast Nozzle Orifice Size

Operating Blast Pressure (PSI) Standard blasting: 80 - 100 PSI

Abrasive Media Type

Blasting Delivery System

Continuous Blast Target (Mins)

📊 Air Consumption & Equipment Requirements

Required Free Air (CFM) 38.0 CFM 1.08 m³/min @ 90 PSI

Min Compressor Horsepower 10.0 HP Rotary screw or 2-stage piston

Abrasive Media Flow Rate: 250 lbs/hr (113 kg/hr)

Media Used for Session: 125 lbs (2.5 bags)

Nozzle Orifice Area: 0.0276 sq.in (3/16")

Air Supply Line Recommendation: ≥ 3/4" ID Air Hose

✅ Equipment match: A 10 HP industrial compressor will sustain 38 CFM continuously without tank pressure bleed-down.

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The #1 Mistake in Sandblasting: Undersized Air Compressors

Sandblasting is the single most air-hungry process in any workshop. While a 1/2" impact wrench consumes 5 CFM intermittently, an abrasive blast nozzle is a continuous open orifice dumping compressed air at supersonic speeds.

The 4-CFM-per-Horsepower Rule

Industrial air compressors produce approximately 3.5 to 4.0 CFM of Free Air Delivery (FAD) per electric motor horsepower at 90 to 100 PSI. A standard #3 (3/16") blast nozzle demands nearly 40 CFM at 90 PSI, meaning a 10 Horsepower continuous-duty compressor is strictly required. Attempting to run a 3/16" nozzle on a 3 HP hobby compressor causes pressure to crash to 30 PSI in seconds!

Nozzle Wear Enlargement

Abrasive particles accelerate through the nozzle at over 400 miles per hour, eroding the interior carbide bore. When a #3 (3/16") nozzle wears open to #4 (1/4"), its air consumption jumps by over 100% (from 38 CFM to 80 CFM)! Regularly check nozzle bore diameters with drill shank gauges.