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# OAR Box 

# 1814

Prepped hy Ollie Stewart



### Document

Number: 

# 40 ) ll-B-1 8

Docket Number: 

# A-88-0 2

Printed 11/7/20087:22:08AM

Sheet 40of 63$ ) P. 2 

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## A-88-0 2 MIDWES T RESEARC H INSTITUT E

450 5 Creedmoo r •• Raleig h N C

Date : Marc h12 , 198 7

(Finalize dApri l 21 , 1987 ) Subject : Sit e Visit—Diamon dChrom e Plating , Inc .

Chromiu m Electroplatin g NESHA P EPA Contrac t 68-02-3817 ; ESE D Projec t 85/02 a MR I Projec t 7717- K
From : Randy

Strai t i^ . To : A l 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 hardchromiu m electroplatin g operatio na t thi s plan t an d t o determin e th e suitabilit y o f a Tr1-Mer ®fan/separato r scrubbe r fo r chromiu m emission s testing . II . Plac e an

d Dat e Diamon dChrom e Plating , Inc . 60 4 Sout hMichiga nAvenu e Pos t Offic e Bo x31 2 Howell , Michiga n4884 3 (517 ) 546-015 0 Ma y 22 , 198 6

III . Attendee s Diamon dChrom e Plating , Inc . Jac k C . Beatty , III , Genera l Manage r Midwes t Researc hInstitut e Randy Strai t

/P. 3

IV . Discussio n Th e visi t consiste d o f a discussio nabou t th e har dchromiu m electroplatin g operation s an d chromiu

m emissio ncaptur e an dcontro l equipmen t a t th e plant . Th e discussio nwa s followe db y a complet e tou r o f th e plant . A . Genera l Diamond Chrome Plating , Inc. , 1 s a large-siz e jo bsho p (35,00 0 squar e feet ) tha t perform s har d chromiu m platin g o f aircraft , machin e tool , an

d hydrauli c parts . Th e plan t ha s bee n1 noperatio nfo r 3 2 years . Th e plan t i s operate d1 8 hour s pe r day , 5 t o 6 day s pe r week , an d 5 0 week s pe r yea r an d use s fro

m 60,00 0 t o 80,00 0 pound s o f chromi c a d d pe r year . B . Proces s Descriptio n Twelv e hard chromiu

m platin g tank s a t thi s facilit y ar e vente dt o a Tr1-Mer ®fan/separato r scrubber . Th e tank s ar e numbere d1 throug h8 an d9 throug h13 . Th e dimension s an doperatin g parameter s o f th e 1 2 tank s ar e presente d 1 nTabl e 1 . Th e concentratio no f chromi c ad d 1 nth e platin g bath s range s fro

m 2 8 t o 3 3 ounce s pe r gallo n(oz/gal) o f platin g solution . Sulfuri c ad d 1 s use da s a catalys t 1 nth e platin g bath s 1 na concentratio nrangin g fro m 0.2 8 t o 0.3 3 oz/ga l o f platin g solution . Th e bath s ar e operate d a t abou t 132° F an d ar e coole dwit hwater . Th e plan t als o operate s severa l othe r har d chromiu m platin g tank s tha t ar e vente dt o two Cellcot e vertical-flow packed-be dscrubbers . C . Emission s Contro l

Eac ho f th e 1 2 tank s 1 s equippe dwit ha double-side ddraf t hood vente d t o th e on e Tr1-Mer ®fan/separato r scrubbe r tha t wa s purchase da s use d equipmen t an

d Installe d a t th e plan t 1n1983 . Th e scrubbe r wa s originall y

installe d a t a plan t 1 nChicago , Illinois , 1 n1974 . Th e ga s flo w rat e t o th e scrubbe r i s 45,00 0 cubi c fee t pe r minute , an dth e uni t 1 s equippe d wit ha 75-horsepowe r motor . A diagra m o f th e fan/separato r scrubbe r wit ha singl e packe dbe d1 s show n1 nFigur e 1 . Th e scrubbe r a t thi s plan t contain s tw o packe dbeds . Th e fan/separato r scrubbe r consist s o f tw o stages : a dynami c scrubbin g stag e followe d b

y animpingemen t stage . I nth e firs t stage , ventilatio n ai r 1 s ducte d Int o th e ey e o f a backward-blad e centrifuga l fa nwher e 1 t 1 s spraye d wit hhigh-pressure , low-volume wate r o r scrubbin g liquid . Th e wate r flow

rat e t o th e ey e o f th e fa n1 s 2 4 gallon s pe r minut e (gal/m1n ) a t 1 0 pound s pe r squar e Inc h(ps1 ) o f pressure . Contaminan t aerosol s ar e entraine d an

d spunou t centrifugall y ont o th e fa nscroll . Th e centrifuga l actio ncreate d b

y th e fa nwhee l eliminate s approximatel y 5 0 percen t o f th e Incomin g chromi c aci d mist . I nth e second stage , th e exhaus t ga s flow s Int o a nexpansio nchambe r containin g tw o packe dbed s o f hydrophobi c tubin g mad e o f polypropylene . Th e expansio nchambe r 1 s designe dt o reduc e th e velocit y o f th e contaminate d ga s strea m t o n o mor e tha n50 0 fee t pe r

^

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### TABL E 1 . DIMENSION S AN D OPERATINGPARAMETER S FO RTWELVE HARD CHROMIU

M PLATINGTANK S

Tan k No . 

### 1 2 3 4 5 6 8 9 10 1 1 1 2 1 3 Dimension s

(1 , w , d) , ft a

10 , 3 , 4 16 , 3 , 4 3 , 3 , 6 10 , 3 , 4 4 , 4 , 1 0 24 , 2.5 , 4 10 , 3 , 4 10 , 3 , 4 10 , 3 , 2. 5 34 , 2.5 , 4 10 , 3 , 2. 5 10 , 3 , 3 Capacity , gal 

### 89 0 1,43 0 

### 40 0 89 0 1,19 0 1,79 0 

### 89 0 89 0 56 0 2,54 0 

### 56 0 67 0 Voltage ,

volts 0 

### 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 Current ampere s 8,80 0 12,50 0 3,50 0 7,50 0 6,00 0 10,00 0 6,50 0 5,00 0 5,00 0 17,00 0 9,00 0 3,40 0 

### !* 1 = length , w

= width , d = depth . D 

### Max1mu m value s fo r eac htank . Actua l voltag e t o 1 2 volts . Actua l curren t value s ca nrang e th e maximu

m curren t values . value s ca nrang e fro m 3. 5 fro m 1 0 t o 10 0 percen t o fCUM

. n r i n

nun c MIM

S

CMIMIIM

l IU M I I MMHI III ! U l MIIICU

S

IIC I riissw

. (• •IIIIM I m u

niaa r U-III I siPiiii m ( u m PMIICU S )

SICIIIll l S

t Mil l II I

. 1 muraiu tu u M

M HKI M r « CMIOUM S H H IHM I

IIIIIM t SIMI-II U I ? MIIIC U ••MCII M I IIIIKiPIl M It * MfCIIM- 1 M l CMIS I I I PliCH M UlClll t

CMI/UII»lf l Mil l I I Ulll l _«SI ! iiuia m 1 1 mas s nis i

^ Figur e 1

. Fan/separato rscrubber

.P. 6



### minut e fo r maximu

m Impingemen t efficiency . Th e gase s ar e spraye dwit h wate r befor e th e firs t packe dbed . Becaus e th e ga s flow change s directio n numerou s time s a s 1 t passe s throug hth e packe dbeds , chromi c aci ddroplet s Imping e onth e packin g medi a an dseparat e fro

m th e ai r stream . Th e wate r flow rat e t o th e packed-be dstag e 1 s 4 8 gal/m1 na t 1 0 psi . Contaminate d wate r 1 s pumpe dfro

m th e uni t t o a remot e recirculatio ntank an dthe n recirculate dthroug hth e scrubbe r t o reduc e wate r consumptio ncosts . Th e scrubbe r wate r 1 s draine donc e pe r wee k an d1 s reuse d1nth e platin g tanks . Th e plan t ha s modifie dth e scrubbe r b y Installin g fou r spray nozzle s betwee nth e firs t an

dsecondpacke dbed s becaus e chromiu m droplet s wer e occasionall y

breakin g throug hth e secondpacke dbed . Th e wate r fo r thes e nozzle s 1 s clea nmakeu pwate r tha t typicall y 1 s use dt o offse t evaporatio n 1 nth e scrubbe r andtha t otherwis e woul db e dumpe dInt o th e sump . Wate r flow 1 s 3. 2 gal/mi ntota l t o th e fou r nozzle s Intermittentl y a s neede dt o maintai nth e wate r level . Th e nozzle s operat e fro m 1 0 t o 3 0 minute s eac h hou r dependin g o nweathe r conditions . Mr . Beatt y state dtha t Installin g thes e fres hwate r spra y nozzle s eliminate dth e breakthroug hproblem . V . Conclusion s DiamondChrom e Plating , Inc . 1 s representativ e o f a large-siz e job sho ptha t perform s har dchromiu m platin g o f aircraft , machin e tool , an d hydrauli c parts . Emissio ntestin g o f th e fan/separato r scrubbe r 1 s no t recommende dbecaus e ther e ar e onl y abou t 2 fee t o f straigh t ductwor k a t th e Inle t o f th e unit , whic hwoul dno t allow fo r th e prope r locatio no f a tes t port . Also , becaus e th e scrubbe r 1 s no t equippe dwit ha stack , a stac k woul dhav e t o b e Installe dt o perform outle t emissio ntesting . Exhaus t gase s ar e vente dthroug ha 50-1nch-squar e openin g locate dabov e th e secon

dpacke dbed . Mr . Beatt y wa s ver y

cooperativ e durin g th e visit , an dth e informatio nprovide dwil l b e mos t usefu l t o th e chromiu m study .