WPC  "b|>0RU=֫%.V)^+L %ຠt˧^I9MS\ nIq^ALQݰ5'2_Z_؉/f}= R$O]!4ְN!h{9_hnVVx^E~g\5Ik] ^ \ID M3TrD)hLQY ϲ i 6?3^}NVFxR+BP8lU;"aoGc8@s.cQN^H ~#ow,# hUNs % 0(w@4/CREZ\\\\\\\\\\\\\\\\\\\\\ B"""" 0D????? AY 0F D+HP LaserJet 4 PlusHPPCL5MS,,,,,,0vLH(uH Z 6Times New Roman RegularX($ DDED{$3|xLevel 1Level 2Level 3Level 4Level 5 d(3$ !  )#*+M << deUULevel 1Level 2Level 3Level 4Level 5(n$ (  1  ) 'dxd !  A ) xdEVxA 򛀀   Л@  uEMISSIONMEASUREMENTTECHNICALINFORMATIONCENTERuuEMISSIONMEASUuvuEuvwREMENTCENTERw  @ }C}ONDITIONALTESTMETHOD(gGUIDELINEDOCUMENT(zALT015zCTMGD041)A ) xdEsxA t  DeterminationofChromiumEmissionsFromDecorativeAndHardChromiumElectroplatingAndAnodizingOperations:CommentonSection3.1.9ofMethod306Aof40CFRPart63,AppendixA:VacuumPumpPerformance.  e  ̜ Background )   0  Section3.1.9ofMethod306Aspecifiesavacuumpumpunit,GastModel (#(# Ѐ0522V103G18DX,orequivalent,asbeingcommerciallyavailableforassemblyoftheMethod306Asamplingtrain.Thereferencedpumpmodelisanonlubricating,carbonvaneunit,capableofdeliveringatleast1.5cfmat15in.Hgvacuum..Additionally,Section5.1.1.5ofMethod306Aspecifiesthatthesamplingtraingsystem,includingthepump,shallnotexceedaleakrateof0.02cfmat15in.Hg. Discussion a  0  EPAwasrecentlynotifiedthatGasthasdiscontinuedtheModel0522V103G18DX9(#(# pump.Forreplacement,EPArecommendstheGastModel0523V3G582DXorequivalent,capableofdeliveringatleast1.5cfmat15in.Hgvacuum.ThereplacementModel0523V3G582DXisalubricatingstylepumpwithresinvanes.AnonlubricatingcarbonvanepumpisϜnolongerrecommendedforthisapplicationbecausethecarbonvaneshavebeenfoundtooftenseizeaswellasproduceleakageproblems.0  Ithasbeenreportedthattheresinvanepumpwillproduceahighervacuum(26.5in.Hg) (#(# thanthecarbonvanepump(26.0in.Hg).Usersreportthatwithaminorconversion(installationofamodifiedoiler),thereplacementresinvanepumpwillprovideleakproofoperation.AccordingtoGast,thereplacementresinvanepumpsystemincludesafilter,muffler,andasiphontypeoiler.Thesiphontypeoilerrequiresthatasmallamountofoutsideairbeinjectedtotransporttheoilvaporstotheresinvanes.IntjectionofthisoutsideairintothepumpmakesitϜimpossibleforthelubricatedpumpsystemtoprovidealeakproofoperation.0  Anoptionalleakproofoilerassembly(GastNo.AA680Korequivalent)canbeusedto (#(# convertthereplacementresinvanepumptoaleakproofsystem.Theleakproofconversionforthelubricatedpumpunitconsistsofthefollowingsteps:0  1)Obtainspecialleakproofoilerassembly,GastNo.AA680K,orequivalent,thatreplacesthesiphonoilerthatwassuppliedwiththeGastlubricatingpump.Y-(-(#(# Ѐ̛0  2)PlacepipedopeorTeflontapearoundthreadsofa1/4"pipeplug,beingcarefultonotallowloosetapeendstoextendbeyondtheplugend;loosetapepiecescanresultinseizureofthepumpvanes. (#(# 0  3)Installthe1/4"pipeplugintheoilerinletsideport. (#(# 0  4)ModifytheAA680Koilerbydrillinga1/4"O.D.holeinthehead/capassembly(drillϜcompletelythroughinlet/outletopenings).The1/4"O.D.holeshouldextendthroughtheentirehead/capassembly(sidetoside). (#(# 0  5)Insertapipecleaner wickinthecenterofthehead/capassembly.Thewickshould (#(# 0  extendupwardfromthebottominsideoftheoilerto~1"throughthecenteropeningofthehead/capandtowardthedirectionthattheairflowwilltravel.Thiswickwillproduceacapillaryactionthatwillallowoilvaporstolubricatetheresinvanes.Alsoitmaybenecessarytoinstallasmallorificeintheoilercapheadorpluganyinsideextraoilercapholesthatwouldallowexcessiveoilvaporsfromtheoilerreservoirtobetransferredtothepumpsystem.0(#(#\(#(# 0  6)Installthereplacementoilerunittotubingleadingtotheinlettopportofthepumpinauprightpositionsothatoilcanbeeasilyplacedintheglassreservoir.UseTeflontapeordopetosealthefittingsandwrapTeflontapearoundtheoilerglassoraluminumjar/thimblethreadstoassurenoleaks.EliminateanylooseTeflontapeendsthatmaybeϜwithdrawnintothevanes. (#(# 0  7)Usermayalsoelecttoinstallthestandardfilterassemblyontheinletsideofthepumptocollectlooseparticles(silicagel,etc.). (#(#  0  8)Installstandardmufflerassemblyontheoutletpumpporttocontrolnoiseandcollect  excessoil. (#(# ̜  @-(, Conclusion0   LeakproofpumpperformancecanbeachievedwiththeGastModel0523V3G582DX(#(# pump,orequivalent,bymodifyingtheoptionaloilerassembly,No.AA680K,andinstallingitontheresinvanelubricatingpump.0  Ifadditionalinformationisrequired,pleasecontactGeneRiley,(919)5415239or (#(# RobinSegall,(919)5410893. 򀀀   ` PreparedbyGeneRiley,SCGA0 h 0h(#h(#0(#(#0p(#(#0p(#p(#EMCALT015GD041 L (#(# EmissionsMonitoringandAnalysisDivision,OAQPS0 p 0p(#p(#August8,1997 8 (#(#  򀀀