Graco EcoQuip EQ200T - Page 16

Operation
Abrasive Abrasive
Abrasive
Metering Metering
Metering
Valve Valve
Valve
Settings Settings
Settings
Thereisno󰘰xedformulaforwhatworksbestineachapplication.Theinformationbelowworksbestforthe
majorityofthetime.Fromthisinitialsetting,adjustmentscanbemadeupordowntogetthefastestremoval
rateswithoutdamagetothesurface.
Normalsettingsare:110psi(7.5Bar,0.75MPa)initialpotsetting,lessthan1/2turnopenmeteringvalve,
blastingpressureat80psi(5.5Bar,0.55MPa).Forapplicationsrequiringhigherperformance,use
high-performanceabrasive(theheaviestmass@80grit)suchasGarnet,andthehighestpressuresthe
systemcansupport.Theinitialpotpressureshouldalwaysbe30psi(2.0Bar,0.2MPa)abovetheintended
blastpressure.
Graduallymakeadjustmentstomeetthespeci󰘰crequirementsforeachapplication.Makeadjustments(see
DataTrakControls,page7)toachieve7-10cyclesperminutetobethemostef󰘰cient(cutatthefastestrate
whileusingtheleastamountofabrasive).Blastingpressurescanrangebetween30-120psimax(2.0Bar,
0.2MPa–8.2Bar,0.82MPa).
Unlikeconventionalsandblasting,higherpressuresdonotnecessarilymeanbettercleaning.Nozzledistance
andtheangletothesurfacehasaneffectonperformance,asdoestheblastpressure.Choiceofabrasive
alsohasagreateffect.High-performanceabrasiveproducesthebestperformanceandcansaveenough
timetomakeupthedifferenceincost.
NOTE: NOTE:
NOTE:
Blastingwith150ft(45m)ormoreblasthoserequirestheuseofanelectricblastcontrol.
Grit Grit
Grit
Size Size
Size
Blast Blast
Blast
Pressure Pressure
Pressure
Abrasive Abrasive
Abrasive
Metering Metering
Metering
Valve Valve
Valve
Blast Blast
Blast
Angle Angle
Angle
Notes Notes
Notes
General General
General
40/70crushed
glass
60-80psi(4.1Bar,
0.41MPa-5.5Bar,
0.55MPa)
10cyclesper
minute
35°-65°
None
Wood Wood
Wood
80(usingalow
massabrasive
likecrushedglass
orwalnut)
40-50psi(2.7Bar,
0.27MPa-3.4Bar,
0.34MPa)
8cyclesper
minute
15°-30°
Donotwash,asit
mayraisethewood
grain.Brushoff
excessabrasiveafter
thewooddries.
Steel Steel
Steel
60–80(using
ahigh-mass
abrasivelike
Garnet)
100-120psi(6.8Bar,
0.68MPa-8.2Bar,
0.82MPa)
10–12cyclesper
minute
45°-65˚
None
Fiberglass Fiberglass
Fiberglass
40-70lowmass
45-65psi(3.1Bar,
0.31MPa-4.4Bar,
0.44MPa)
8cyclesper
minute
35°-45˚
None
NOTE: NOTE:
NOTE:
Adjustmentinblastpressurerequiresanadjustmentoftheabrasivemeteringvalve.
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