Operation

Metering Valve Settings

There is no fixed formula for what works best in each application. The information below works best for the majority of the time. From this initial setting, adjustments can be made up or down to get the fastest removal rates without damage to the surface.

Normal settings are: 110 psi (7.5 Bar, 0.75 MPa) initial pot setting, less than 1/2 turn open metering valve, blasting pressure at 80 psi (5.5 Bar, 0.55 MPa). For applications requiring higher performance, use high-performance abrasive (the heaviest mass @ 80 grit) such as Garnet, and the highest pressures the compressor can support. The initial pot pressure should always be 30 psi (2.0 Bar, 0.2 MPa) above the intended blast pressure.

Gradually make adjustments to meet the specific requirements for each application. Higher blast pressures will require turning the abrasive metering valve slightly more open (and vice versa). Make the adjustments (see DataTrak Controls, page 7 ) to achieve 7-10 cycles per minute to be the most efficient (cut at the fastest rate while using the least amount of abrasive). Blasting pressures can range between 30 - 120 psi max (2.0 Bar, 0.2 MPa – 8.2 Bar, 0.82 MPa).

Unlike conventional sandblasting, higher pressures do not necessarily mean better cleaning. Nozzle distance and the angle to the surface has an effect on performance, as does the blast pressure. Choice of abrasive also has a great effect. High-performance abrasive produces the best performance and can save enough time to make up the difference in cost.

NOTE: Blasting with 150+ feet of blast hose requires the use of an electric blast control.

 

Grit Size

Blast Pressure

Abrasive Dose

Blast Angle

Notes

General

40/70

60-80 psi (4.1 Bar,

1/4 to 1/2 turns

35° - 65°

When the blast

 

 

0.41 MPa- 5.5 Bar,

 

 

pressure is

 

 

0.55 MPa)

 

 

increased, the

 

 

 

 

 

abrasive dose turns

 

 

 

 

 

will also need to be

 

 

 

 

 

increased.

Wood

80 (using a low

40-50 psi (2.7 Bar,

1/8 to 1/4 turns

15° - 30°

Do not wash, as it

 

mass abrasive

0.27 MPa- 3.4 Bar,

 

 

may raise the wood

 

like glass)

0.34 MPa)

 

 

grain. Brush off

 

 

 

 

 

excess abrasive after

 

 

 

 

 

the wood dries.

Steel

80-100 (using

100-120 psi (6.8 Bar,

1/4 – 1/2 turns

65° - 85˚

When the blast

 

a high-mass

0.68 MPa- 8.2 Bar,

 

 

pressure is

 

abrasive like

0.82 MPa)

 

 

increased, the

 

Garnet)

 

 

 

abrasive dose turns

 

 

 

 

 

will also need to be

 

 

 

 

 

increased.

Fiberglass

40-70 low mass

45-65 psi (3.1 Bar,

1/8 to 1/4 turns

35° - 45˚

When the blast

 

 

0.31 MPa- 4.4 Bar,

 

 

pressure is

 

 

0.44 MPa)

 

 

increased, the

 

 

 

 

 

abrasive dose turns

 

 

 

 

 

will also need to be

 

 

 

 

 

increased.

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Graco ti25442a manual Grit Size Blast Pressure, General, Wood, Steel, Fiberglass

ti25442a specifications

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