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# OAR Box 1313 Prepped by LaTeia Shed



### Document

Number: 

# 35 ) ll-B- 9

Docket Number: 

# A-88-0 2

Printed 6/12/20089:03:28AM

Sheet 35of 99P. 2

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# FIL E

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## A-88-0 2

MIDWES T RESEARC H INSTITUT I 450 5 Creedmoo r Roa i Raleigh , N.C
. 2761 :

•- .Telephon e (919 ) 781-575 1

Date : Jul y

18 , 198 6 (Finalize d Decembe r 19 , 1986 ) Subject : Sit e Visit—Abl e Machin e Compan y Chromiu m Electroplatin g NESHA P EP A Contrac t 68-02-3817 ; ESE D Projec t 85/02 a MR I Projec t 7717- K\
From : Randy

Strai t
To : Al Vervaer t

ESED/ISB/SS S (MD-13 ) U . S . Environmenta l Protectio nAgenc y Researc hTriangl e Park , N.C . 2771 1
I . Purpos e Th e purpos e o f thi s sit e visi t wa s t o gathe r backgroun dinformatio n abou t th e chromiu

m electroplatin g operatio na t thi s plan t an d t o determin e th e suitabilit y

o f thi s plan t fo r chromiu m emission s testing . II . Plac e an

d Oat e Abl e Machin e Compan

y Pos t Offic e Bo x67 5 Taylors , Sout hCarolin a 2968 7 (803 ) 244-089 3 Marc h27 , 198 6
III . Attendee s Abl e Machin e Compan

y Ricky Owen s U . S . Environmenta l Protectio nAqenc y Al Vervaert , IS B Midwes t Researc hInstitut e Rand y Strai t

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IV . Discussio n
A . Genera l Abl e Machin e Compan

y i s a smal l jobsho ptha t perform s hardchromiu m electroplatin g o f industria l rolls . B . Proces s Informatio n Ther e ar e tw

o har d chromiu

m platin g tank s a t thi s facility . Tan k 1 wa s installe d i nJul y 1985 . Th e tan k measure s 1 4 fee t (ft ) i nlength , 4 f t 1 nwidth , an

d 1 0 f t 1ndept handhold s abou t 4,18 0 gallon s (gal ) o f platin g solution . Tan k 2 measure s 11. 5 f t 1 nlength , 2. 5 f t 1nwidth , an d 8 f t 1 ndept han

d hold s abou t 1,72 0 ga l o f platin g solution . Th e platin g solutio nfo r bot htank s consist s o f chromi c ad d (Cr0 3 ) i na concentratio no f 2 8 ounce s pe r gallo n(oz/gal ) o f water . Sulfuri c a d d (HjSO,.. ) i s use d a s a catalys t 1 nth e platin g solutio n1 na concentratio no f 0.1 8 oz/gal . Th e norma l operatin g temperatur e o f th e platin g solutio n1 s betwee n110 ° an d 140°F . Bot htank s ar e coole dwit h water . Anoverhea d hois t 1 s use dt o transpor t roll s t o an dfro m th e platin g tanks . Tan k 1 i s operate d a t ful l capacit y fo r on e 8-hou r shif t pe r day . Tan k 2 , whic hwa s no t operatin g durin g ou r visit , 1 s use donl y whe n Tan k 1 i s shu t dow

nfo r repair s o r whe nth e plan t receive s a heav y wor k load . Typically , eac htan k i s operate da t ful l capacit y whe ni nuse . A maximu m o f 1 2 roll s i s plate d a t a tim e inTan k 1 fo r 1. 5 hour s a t 7. 5 volt s (V ) an

d 8,00 0 ampere s (amps) . A maximu m o f eigh t roll s 1 s plate d a t a time i nTan k 2 fo r 2 hour s a t 6. 0 V an d6,00 0 amps . Afte r bein g plated , th e roll s ar e rinse dwit hwate r fro m a hos e ove r th e to po f th e platin g tank . Thi s rinsin g allow s exces s platin g solutio no nth e roll s t o drai nint o th e platin g tank , thu s reducin g drag-out . I t take s a tota l o f abou t 4 0 minute s t o unloa d an d loa don e platin g tank . Tan k 1 i s energize d b y a singl e transformer/rectifie r equippe dwit h a time r an

d othe r automati c controls . Th e time r i s se t t o tur nof f th e transformer/rectifie r whe nplatin g i s completed . Othe r automati c control s regulat e th e voltag e an d curren t an

d tur nth e transformer/rectifie r of f whe nth e platin g bat hexceed s norma l operatin g parameter s o r whe nth e platin g tan k ventilatio nsyste m malfunctions . Maximu m operatin g voltag e an d curren t fo r th e transformer/rectifie r ar e 1 2 V an d12,00 0 amps , respectively . Tan k 2 i s energize db y a singl e transformer/rectifie r withou t automati c controls . Maximu m operatin g voltag e an dcurren t ar e 1 5 V an d 6,00 0 amps , respectively . C . Emissio nContro l
A schemati c o f th e exhaus t system s fo r Tank s 1 an d2 i s show

ni n Figur e 1 . Th e captur e an d contro l system

fo r Tan k 1 wa s manufacture dan d installe d 1 nJul y

198 5 b y Dual l Industries , Incorporated . Th e tan k i s equippe d wit ha push-pul l captur e system . Th e hoo dinstalle do nth e bac k



## tLSTAC K STAC K

DUAL L MOISTUR E EXTRACTOR LEGEND AIRFLO W

• e WATE RFLO

W

WAL L DUAL L MIS T ELIMINATOR ^ WAL L

KC H SINGL E PACKED-BE D SCRUBBE R

Figur e 1 . Schemati c o f har d chromiu m platin g operatio na t Abl e Machin e Company . 

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o f th e tank 1 s 1 2 f t i nlengt han d6 f t i nheigh t an

dcontain s 3 row s o f slot s wit h1 5 slot s pe r row . Th e slot s ar e 1 0 inche s (in. ) 1nlengt han d 1 in . i nwidth . Th e pushe r sid e o f th e hoo dInstalle d o nth e fron t o f th e tan k contain s 7 2 hole s space d 2 in . apart . Eac hhol e i s 0.12 5 in . in diameter . Bot hside s o f th e tan k ar e equippe dwit hbaffle s 4 f t i nlengt h an d 6 f t i nheight . Removabl e panel s ar e place dove r th e to po f th e tank durin g platin g t o enclos e th e surfac e o f th e platin g solutio nt o maximiz e captur e efficiency . Tan k 2 als o i s equippe d wit ha push-pul l captur e system . Th e hood installe d o nth e bac k o f th e tan k i s 1 2 f t i nlengt han d3. 5 f t 1nheigh t an d contain s 3 row s o f slot s wit h1 2 slot s pe r row . Th e slot s ar e 1 0 In . inlengt han

d 0. 5 1n . i nwidth . Th e pushe r sid e o f th e hoo dcontain s 4 2 hole s space d 2 1n . apart . Eac hhol e 1 s 0.12 5 1n . i ndiameter . Th e righ t sid e o f th e tank onl y i s equippe d wit ha baffl e 3 f t i nlengt han d 2 f t i nheight . Chromiu m emission s fro

m Tan k 1 ar e vente d t o a chevron-blad e mis t eliminato r locate d o na mezzanin e structur e behin dth e tank . Th e airflo w rat e o f th e mis t eliminato r i s 6,00 0 actua l cubi c fee t pe r minut e (acfm) . A

moistur e extracto r i s installe d i nth e stac k downstream o f th e mis t eliminato r t o contro l chromiu m emission s tha t ar e draw nthroug hth e mis t eliminator . Th e moistur e extracto r consist s o f a stationar y se t o f blade s tha t centrifugall y force s aci dmis t o r droplet s entraine di n exhaus t ga s t o imping e agains t th e side s o f th e extracto r wall . Th e droplet s drai ndow

nth e side s o f th e extracto r int o collectio narea s an d the nar e flushe d ou t o f th e unit . Th e mis t eliminato r an dmoistur e extracto r ar e washe d dow nwit habou t 7 5 ga l o f wate r a t th e en do f eac h workin g da y

an d eac hmornin g i f th e platin g tank wa s operate dovernight . Wash-dow nwate r i s draine d int o a 160-ga l holdin g tank insid e th e platin g shop . Th e platin g tank s ar e equippe d wit ha floa t tha t regulate s th e flow o f wate r fro

m th e holdin g tank t o th e platin g tank . A singl e packed-be d vertical-flo w we t scrubbe r i s use dt o contro l chromiu m emission s fro

m Tan k 2 . Th e scrubbe r wa s manufacture dan d installe d i n198 0 b

y KC H Services , Incorporated . Th e desig nga s flow rat e o f th e scrubbe r i s 5,00 0 standar dcubi c fee t pe r minute , an dth e operatin g ga s flow rat e i s 6,47 2 acfm . Th e desig nwaterflo w rat e t o th e scrubbe r i s 1 5 ga l pe r minute . Th e scrubbe r wate r i s pumpe dt o th e rins e tank an d recirculate d t o th e scrubbe r o na continuou s basis . Th e rins e tank i s 4 f t 1 nlength , 3. 5 f t i nwidth , an d 8 f t i ndept han

dcontain s a maximu

m o f 83 8 gal . D . Conclusion s Abl e Machin e Company

i s a smal l jo bsho p involve di nhar dchromium plating . Th e captur e system o nTank 1 appear s t o b e ver y effective , an

d the Dual l mis t eliminato r an dmoistur e extracto r woul db e goo dcandidate s fo r emissio ntestin g fo r th e followin g reasons : (1 ) operatin g parameter s o f th e platin g tank ar e typica l o f thos e fo r conventiona l hardchromiu m platin g operations ; (2 ) th e typ e an d amoun t o f wor k plate dwoul dgenerat e chromiu m emission s adequat e fo r testing ; (3 ) parameter s suc ha s surfac e


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### are a plate dan

damoun t o f chromiu

m deposite dca nbe easil y calculated ; (4 ) th e platin g tank an demissio ncaptur e an

dcontro l equipmen t ar e les s tha na yea r ol dan

dar e wel l maintaine dan doperated ; an

d(5 ) ther e i s adequat e duc t lengt ha t th e inle t an doutle t o f th e mis t eliminato r an d moistur e extracto r fo r tes t ports . Emissio ntestin g o f th e KC H scrubbe r o nTan k 2 woul dbe possible . However , th e Inle t locatio ni s les s tha ndesirabl e becaus e a tes t por t woul dhav e t o be cu t a t th e inle t o f th e scrubbe r nex t t o anelbow . Althoug hTan k 2 wa s no t operatin g durin g ou r visit , th e desig no f th e ventilatio nsyste

m shoul dprovid e goo dcapture . Also , th e typ e an damoun t o f wor k plate dwoul dgenerat e adequat e chromiu m emission s fo r testing .



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