Operation

Metering Metering

MeteringValve Valve

ValveSettings 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
compressorcansupport.Theinitialpotpressureshouldalwaysbe30psi(2.0Bar,0.2MPa)abovethe
intendedblastpressure.
Graduallymakeadjustmentstomeetthespecicrequirementsforeachapplication.Higherblastpressures
willrequireturningtheabrasivemeteringvalveslightlymoreopen(andviceversa).Maketheadjustments
(seeDataTrakControls,page7)toachieve7-10cyclesperminutetobethemostefcient(cutatthefastest
ratewhileusingtheleastamountofabrasive).Blastingpressurescanrangebetween30-120psimax
(2.0Bar,0.2MPa–8.2Bar,0.82MPa).
Unlikeconventionalsandblasting,higherpressuresdonotnecessarilymeanbettercleaning.Nozzledistance
andtheangletothesurfacehasaneffectonperformance,asdoestheblastpressure.Choiceofabrasive
alsohasagreateffect.High-performanceabrasiveproducesthebestperformanceandcansaveenough
timetomakeupthedifferenceincost.
NOTE: NOTE:
NOTE:Blastingwith150+feetofblasthoserequirestheuseofanelectricblastcontrol.
Grit Grit
GritSize Size
SizeBlast Blast
BlastPressure Pressure
PressureAbrasive Abrasive
AbrasiveDose Dose
DoseBlast Blast
BlastAngle Angle
AngleNotes Notes
Notes
General General
General40/7060-80psi(4.1Bar,
0.41MPa-5.5Bar,
0.55MPa)
1/4to1/2turns35°-65°Whentheblast
pressureis
increased,the
abrasivedoseturns
willalsoneedtobe
increased.
Wood Wood
Wood80(usingalow
massabrasive
likeglass)
40-50psi(2.7Bar,
0.27MPa-3.4Bar,
0.34MPa)
1/8to1/4turns15°-30°Donotwash,asit
mayraisethewood
grain.Brushoff
excessabrasiveafter
thewooddries.
Steel Steel
Steel80-100(using
ahigh-mass
abrasivelike
Garnet)
100-120psi(6.8Bar,
0.68MPa-8.2Bar,
0.82MPa)
1/4–1/2turns65°-85˚Whentheblast
pressureis
increased,the
abrasivedoseturns
willalsoneedtobe
increased.
Fiberglass Fiberglass
Fiberglass40-70lowmass45-65psi(3.1Bar,
0.31MPa-4.4Bar,
0.44MPa)
1/8to1/4turns35°-45˚Whentheblast
pressureis
increased,the
abrasivedoseturns
willalsoneedtobe
increased.
16 334667B