2 I THE NOZZLE SIZE

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W E T A B R A S I V E B L A S T I N G

CHOOSING A BLASTING NOZZLE: 4 THINGS TO CONSIDER

1 I THE AIR COMPRESSOR

2 I THE NOZZLE SIZE

3 I THE NOZZLE SHAPE

4 I THE NOZZLE MATERIAL

The more air volume you can compress per minute, the higher the pressure produced at the nozzle. A rotary compressor compresses the

air twice to increase the pressure.

To find your optimally productive nozzle, determine what nozzle pressure (PSI) you need to maintain for productive blasting, and what

volume of air your compressor can supply per minute (CFM).

Harder materials will be more resistant to wear, but are more expensive to replace and are prone to cracking under rough handling.

Atmospheric pressure

High pressure

Extremely high pressure

1

2

3

1

2

3

50 PSI3,4 BAR

60 PSI4,1 BAR

70 PSI4,8 BAR

80 PSI5,5 BAR

90 PSI6,2 BAR

100 PSI6,9 BAR

125 PSI8,6 BAR

110 124 145 160 175 200 275

150 170 200 215 240 255 315

200 225 250 275 300 340 430

300 350 400 450 500 550 700

430 500 575 650 700 800 1100

#6 (3/8» / 9.5 MM)

#7 (7/16» / 11 MM)

#8 (1/2» / 12.7 MM)

#9 (5/8» / 16 MM)

#10 (3/4» / 19 MM)

MINIMUM CFM REQUIRED

Durability

Impact Resistance

Price

Tungsten

Carbide

Durability

Impact Resistance

Price

Silicon

Carbide

Durability

Impact Resistance

Price

Boron

Carbide

Durability

Impact Resistance

Price

Composite

Carbide

www.blastjournal.com I www.graco.com

Nozzles come in two basic shapes: straight

bore and Venturi. Venturi nozzles are designed to

produce an effect which greatly accelerates the air flow

and particles.

Straight Bore

Blast Pattern: XXX

Production Rate: XXX

Long Venturi

Blast Pattern: 3” at 18” distance

Production Rate: 4.5/5

Double Venturi

Blast Pattern: 3” at 18” distance

Production Rate: 4/5

Wide Throat

Blast Pattern: 3” at 18” distance

Production Rate: 5/5

XL Performance

Blast Pattern: 5” at 48” distance

Production Rate: 3/5

The least

durable, but

cheap

Like tungsten

carbide, but

lighter

Extremely hard

and durable, but

brittle

Even harder

than boron

carbide

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