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# OAR Box 1313 Prepped by LaTeia Shed



## Document

Number: 

# 68 ) ll-B-4 2 Docket Number: 

# A-88-0 2

Printed 6/12/20089:03:30AM

Sheet 68of 99P. 2 

# MRI ® A-88-0 2 MIDWESTRESEARC H INSTITUT E H-P>-<--.'2 - Suite 3 5 -0 1 Hamso n Oak

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. N C 275 1

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# 75770 ° *^.7!.;- " Date : Ma

y20 , 198 8 (Finalize d Jun e 30 , 1988 ) Subject : Sit e Visit—Vermon t America n Corporatio n

Chromiu mElectroplatin g NESHAP EP AContrac t 68-02-3817 ; ESE D Projec t 85/02 a MR I Projec t 7717- K From : Robi n Barke r To : Andre wSmit h

ESD/ISB/SS S (MD-13 ) U . S . Environmenta l Protectio n Agenc y Researc h Triangl e Park , N.C . 2771 1 I . Purpos e The purpos e o f thi s sit e visi t wa s t o determin e th e suitabilit yo f thi s plan t fo r performanc e testin g o f a chevron-blad e mis t eliminato r wit h a doubl e se t o f blades . II . Plac e an

d Dat e Vermon t America n Corporatio n Pos t Offic e Box 78 7 Toccoa , Georgi a 3057 7 (404 ) 779-339 1 Februar y10 , 198 8 III . Attendee s Vermon t America n Corporatio n Tomm yCarlton , Plating Superviso r Midwes t Researc h Institut e (MRI ) Robi n Barke r IV . Discussio n Ameeting wa s hel d wit h Mr . Carlto n o f Vermon t America n Corporatio n t o discus s the har

d chromiu

mplating operatio n an d possibl e emissio n testin g a t the plant . Th e discussio n wa s followed b ya tou r o f th

e platin g facility .

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A . Genera l Vermon t America n Corporatio n i s a captiv e sho p primaril yengage d i n hard chromiu

mplatin

g o f circula r saw blades . The plating shop typicall y operate s 2 4 hours/day , 5 days/week , 5 2 weeks/year , bu t mayoperat e 7 days/wee k i f deman d i s high . B . Proces s Descriptio n Ther e ar e thre e har d chromiu

mplating line s a t thi s plan t (Nos . 1 , 2 , an d 3) . Eac h line i s identica l i n proces s configuratio n an d size . Al l thre e line s ar e automate d an d ar e use d t o plat e circula r saw blades . Th e automate d line s consis t o f a serie s o f tank s fo r cleanin g an d platin g th e part . Th e proces s seguenc e i s a s follows : (1 ) alkalin e soak ; (2 ) spra y rinse ; (3 ) aci d pickl e using muriati c acid ; (4 ) spra yrinse ; (5 ) electro

clean ; (6 ) two di p rinses ; (7 ) dri p tanks ; (8 ) har d chromiu

mplating ; (9 ) fou r col d wate r rinses ; an d (10 ) ho t wate r rinse . Th e thre e har

d chromiu

mplatin g tank s ar e each 4. 0 meter s (m ) (13. 0 fee t [ft] ) long , 0. 8 m(2. 5 ft ) wide , an d 0. 8 (2. 7 ft ) deep . Each tan k hold s approximatel y2,01 0 liter s (53 0 gallons ) of platin g solution . Te n rack s o f part s ar e i n th e chromiu

mplating tan

k a t a tim e wit h a retentio n time o f 2 t o 3 minute s fo r eac h rack . Eac h rac k hold s on e 25.4-centimete r (cm ) (10-inc h [in.] ) blad e o r tw o smalle r blades . Th e platin g thicknes s i s approximatel y0.000 8 c m(0.000 3 in.) . Eac h tan k i s equippe d wit h a rectifie r an d operate s a t approximatel yth e sam e proces s loading . Th e typica l operating voltag e i s 6 volts , an d th e amperag e range s from2,00 0 t o 4,00 0 ampere s o f direc t current . Th e chromiu

mplating solution s contai n chromi c aci d a t a concentratio n rang e o f 22 5 t o 24 0 gram s pe r lite r (3 0 t o 3 2 ounce s pe r gallon ) o f water . Th e plating solution s als o contai n a smal l amoun t o f sulfuri c aci d catalyst . Th e sulfat e ratio s fo r the bath s ar e maintaine d a t approximatel y200:1 . Th e operating temperatur e o f th e platin g solutio n i s 54° C (130°F) . C . Emissio n Contro l Al l thre e chromiu

mplating tank s ar e equippe d wit h single-side d draf t hoods . Each tan k i s ducte d throug

h th e roo f t o a chevron-blad e mis t eliminato r wit h a doubl e se t o f blades . The tw o mis t eliminator s o n line s Nos . 1 an

d 3 wer e manufacture d an d installe d b

yDual l Industries , Inc . Th e mis t eliminato r o n line No . 2 wa s manufacture d an d installe d b

yKCH , Services , Inc . Lin e No . 1 i s als o equippe d wit h a n evaporato r prio r t o th e mis t eliminator . Lin e No . 1 i s vente d t o the atmospher e followin g the mis t eliminator . Amesh-pad mis t eliminato r manufacture d b yKimre , Inc. , an d installe d b

yKC H Services , i s located downstrea mo f the chevron-blad e mis t eliminato r o

n lin e No . 2 . Bot h mis t eliminator s o n lin e No . 2 wer e installe d in Decembe r 1987 . Amoistur e extractor , whic h wa s installe d b y Dual l Industries , Inc. , i s locate d downstrea mo f the chevron-blad e mis t eliminato r o n lin

e No . 3 . Th e ventilatio n rat e fo r eac h syste mi s 2,26 0 actua l cubi c meter s pe r minut e (8,00 0 actua l cubi c fee t pe r minute) . 

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### Th e chevron-blad e mis t eliminator s ar e equippe dwit hspra y washdown system s fo r periodi c rinsin g o f th e chevro nblades . Eac hmis t eliminato r i s washe dfo r 1 0 t o 1 5 minute s a t th e endo f eac h8-hou r shift . Th e washdownwate r i s draine dt o eac hplatin g tank t o mak e u pfo r evaporatio n losses . Th e pressur e dro pacros s eac hmis t eliminato r i s 0. 5 kiloPasca l (2. 0 inche s o f wate r column) . Th e captur e system s onth e platin g tank s appeare dt o b e operatin g effectivel y

durin g th e plan t visit . N o mistin g wa s observe descapin g th e hood s onlin e Nos . 1 an d3 . Th e platin g tank o nline No . 2 wa s no t operating a t th e time o f th e visit . Th e contro l device s use do nth e tank s appeare dt o be effectiv e a t controllin g chromi c aci dmis t becaus e no visibl e spot s o f chromiu m wer e observe do nth e roo f an dductwor k around th e stacks . Th e aci dpickl e an

delectroclea ntank s o neac hproces s lin e ar e equippe dwit hsingle-side ddraf t hoods . Th e tw o proces s tank s fo r eac h lin e ar e the nducte dtogethe r an dvente dt o a singl e packed-be d scrubber . Th e scrubber s ar e vertical-flo w unit s an

dwer e manufacture dan d installe db

y Duall , Industries . Th e thre e scrubber s ar e locate donth e roo f adjacen t t o th e mis t eliminators . 0 . Conclusion s Vermon t America nCorporatio ni s a captiv e shopperformin g har d chromiu m platin g o f circula r sa w blades . Emission s fro m th e har dchromiu

m platin g tan k o nLin e No . 2 ar e controlle dby a chevron-blad e mis t eliminato r wit ha doubl e se t o f blade s a s wel l a s a mesh-pa dmis t eliminator . Th e captur e system o nTan k No . 2 woul dbe expecte dt o operat e a s effectivel y

a s thos e o nTan k Nos . 1 and3 . Therefore , th e har d chromiu m platin g tank inline No . 2 i s a goo dcandidat e fo r testin g th e performanc e o f a chevron-blad e mis t eliminato r wit ha doubl e se t o f blade s a s wel l a s performanc e testin g o f two contro l device s use dinseries . Th e plan t ha s agree dt o cooperat e i na sourc e tes t a t thi s facility .



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