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Abrasive Blasting Operations, Engineering Control and Work ...

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ABRASIVEBLASTINGOPERATIONSEngineeringCon trolandWorkPracticesManualEnviro-Managem ent&Research, , "DEPARTMENTOFHEALTH,EDUCATION,ANDWELFARE PublicHealthServiceCenterforDisceseContr olNationalInstituteforOccupationalSafety andHealthDivisionofPhysicalSciencesandEn gineeringCincinnati,Ohio45226March1976Fo ralllebytheSuperintendentofDocuments, , , , , , (NIOSH)76-179iiACKNOWLEDGDAENTSWeacknowl edgewithgratefulappreciationtheassistanc eprovidedbytheAmericanFoundrymen'sSociet yandTheAmericanIronandSteelInstitute,a l'OUSmanufacturersofabrasl'veblastl'ngeq ul'pment, ,v rEngineeringBranch,DivisionofPhysicalSci encesandEngineering, ~~ ~itsinblastcleaningroomsHand-operatedcab inettypeblastcleaningmachinesAutomaticbl astcleaningmachLTlesWeiblastcleanL~ ~ . 2SpecificmhC~ ') ,000abrasiveblastersareexposedtosilicadu st,inhalationofwhichcanleadtosilicosis, ; blast. mach. type 107Generalsafetycontrols125involved;meth odstoidentifyhazards; , ***vi** ,Education,andWelfare'sNationalInstitute forOccupationalSafetyandHealth(NIOSH) , , ,ontheaverage, (ThresholdLimitValue) ,suchasopen-airabrasiveblasting, ;thepotentialsafetyandhealthhazardsinvol vedinthesepractices; :Abrasiveblastingcanbedefinedasaprocesso fcleaningfu~dfinishingofmaterialsbyforce fuldirectionofanabrasivemediaappliedeith erdryorsuspendedinaliquidmedium, ******CURRENTMETHODSANDOPERATIONScleanas urfacebyremovingunwantedrust,scale,paint ,etc.

vessel) into a blast hose, as shown in Figure 11-2. The compressed air line is piped to both the blast hose &id upper portion of the pressure vessel. Air pressure (usually 80 to 90 psi) to both the hose and pressure vessel are equal thus permitting the free fall of the abrasive through an aperture (feed point) at the bottom of the pressure vessel.

  Vessel

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