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# OAR Box 

# 1313 Prepped by LaTeia Shed



### Document

Number: 

# 46 ) ll-B-2 0

Docket Number: 

# A-88-0 2

Printed 6/12/20089:03:29AM

Sheet 46 of 99P. 2 

# MR I 

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Date :
Subject :

From : To : Marc h16 , 198 7 \

(Finalize dMa y

28 , 1987-) " 

### lC-e-"2 C 

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

450 5 Creedmoo r Roa

< Raleigh , N. C 2761 : Telephon e (919

) 781-575( 

# FIL E COP Y

Sit e Visit—Unite dMeta l Finishing , Inc . o f Greensbor o 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 Robi nBarke r -"- - 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 a s a tes t sit e fo r evaluating the perfor manc e o f a mis t eliminato r wit ha singl e an d doubl e se t o f chevro n blades . II . Plac e an

d Dat e Unite dMeta l Finishing , Inc. , o f Greensbor o 13 3 Blu e Bel l Roa d Pos t Offic e Bo x1662 3 Greensboro , Nort hCarolin a 2740 6 (919 ) 272-810 7 Decembe r 8 , 198 6
III . Attendee s Unite dMeta l Finishing , Inc . Claud e Church , Presiden t
Jerr y C . Messick , Sr. , Vic e Presiden t
U . S . Environmenta l Protectio nAgenc y (EPA )
Al Vervaert , IS B Midwes t Researc hInstitut e (MRI ) Robi nBarke r Am y Kowalsk i Rand y Strai t

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IV . Discussio n Th e visi t consiste do f a tou r o f th e platin g sho pan da discussio n abou t th e hardchromiu m electroplatin g operatio nan dth e chromiu

m emissio n captur e system . Emissio ntestin g o nth e chevron-blad e mis t eliminato r firs t wit ha singl e an dthe nwit ha doubl e se t o f blade s wa s als o discussed . A . Genera l Unite dMeta l Finishing , Inc. , 1 s a smal l jobsho ptha t bega n operatio nabou t 6 month s ago . Th e company perform s har dchromiu m platin g o f industria l roll s an dtextil e machin e an dhydrauli c hois t part s an dals o perform s zin c an

dcadmiu m plating . A

decorativ e platin g lin e 1 s bein g Installe dan

d1 s expecte dt o b e operationa l durin g th e firs t quarte r o f 1987 . Th e hardchromiu m platin g Hn e operate s 2 4 hours/day , 5 days/week . B . Proces s Descriptio n Ther e ar e two hardchromiu m platin g tank s a t thi s facilit y tha t ar e arrange da s show

ni nFigur e 1 . Tan k 1 i s 6. 4 meter s (m ) (2 1 fee t [ft] ) long , 1. 2 m

( 4 ft ) wide , an

d0. 9 m ( 3 ft ) deep . Tan k 2 i s 1. 2 m ( 4 ft ) long , 1. 2 m

( 4 ft ) wide , an

d1. 2 m ( 4 ft ) deep . Th e capacitie s o f Tank s 1 an d2 ar e 7,12 0 liter s (a ) (1,88 0 gallon s [gal] ) an d1,82 0 a (48 0 gal) , respectively . A

nautomati c hois t 1 s use dt o transfe r part s int o an dou t o f th e tanks . Th e platin g solutio ni nth e tank s contain s approximatel y 24 7 gram s pe r Ute r (g/a ) (3 3 ounce s pe r gallo n[oz/gal] ) o f chromi c add . Sulfuri c aci d1 s use da s a catalys t i nth e platin g solutio n1 na concentratio no f approximatel y

2. 5 g/ a (0.3 3 oz/gal ) o f solution . C . Emissio nContro l
Bot htank s ar e equippe dwit hsingle-side dlatera l hoods . Th e hoo d o nTank 1 ha s on e ro

w o f slot s an

dtw o takeoffs . Th e hoo do nTan k 2 ha s two row s o f slot s an

don e takeoff . Durin g th e visit , i t wa s eviden t base d o nvisua l observation s tha t th e ventilatio nsyste m o nTan k 1 wa s ineffectiv e a t capturin g th e chromi c aci dmis t produce ddurin g plating . Substantia l quantitie s o f mis t wer e observe dspillin g ou t o f th e tank Int o th e platin g roo

m an datmosphere . Th e ventilatio nsystem o nTan k 2 appeare dt o b e effectiv e a t capturin g th e chromi c aci dmis t produce d durin g plating . Mr . Messic k state dtha t wit hth e buildin g door s close da s the y ar e i nth e winter , ther e i s insufficien t makeupai r fo r the ventilatio nsyste

m t o perform

a t desig nspecifications . Consequently , a negativ e pressur e i s create dinsid e th e platin g sho pwit hrespec t t o outsid e th e building . Durin g th e summer , th e emissio ncaptur e system operate s a t desig nspecification s becaus e th e ope nplatin g sho pdoor s allo w sufficien t makeupai r t o ente r th e platin g shop .



# a-MOISTUR E

EXTRACTO R 

# ?

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MIS T ELIMINA TO R
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# 1 i ZIN C PLATIN G LIN E



# r+

CHROMIU M PLATIN G TAN K2

SINGLE-SIDE D LATERAL HOO

D SINGLE - S1DL D LATERA L HOO D TTO t CHROMIU M r-L.TIi K

TAN K1

LEGEN D AIP.rLO.. '

= > WATE R -**

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Figur e 1
. Schemati c o f har d chromiu m platin g Tanks 1 an d 2
.

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J*
.Emission s f k a Kii-llrHnf f K w fro m bot h tank s

' H*-af 1 ar e

- fa i 4 ducte d

• * tn' a i togethe r •'hovrnr*-'- * an d

larl o ar e m**c , vente d h oHm-i r •

outsid e ia+*n» - P. 5

Th e fa n i s powere db y a 10-horsepowe r motor . Th e desig nga s flow rat e o f th e system

i s 56 6 cubi c meter s pe r minut e ( m /m1n ) (2^,00 0 cubi c fee t pe r minut e [ft/min]) . Actua l condition s ar e abou t 40 0 m /m1 n (14,00 0 f t /min ) du e t o th e increase dstati c pressur e o nth e fa nresultin g fro m th e deficienc y

1 n makeu pai r supply . Th e mis t eliminato r wa s manufacture dan

d Installe db

y KC H Services , Inc. , i nApri l 1986 . Th e mis t eliminato r contain s a singl e se t o f wave-typ e blades . Th e blad e assembl y i s abou t 18 7 centimeter s (cm ) (73. 5 Inche s [in.] ) i nheight , 17 1 c m (67. 5 1n. ) i n width , and 2 5 cm (1 0 in. ) i ndepth . Th e desig ncross-sectiona l ga s velocit y

a t th e blade s i s 27 4 meter s pe r minut e (90 0 fee t pe r minute) . Actua l condition s ar e lowe r du e t o th e reduce dga s flo w rate . Th e mis t eliminato r i s equippe dwit ha spra y washdow nsystem

t o clea nth e blades . Th e mis t eliminato r i s washe ddow nonc e pe r da y

b y plan t personne l unti l th e washdownwate r run s clean . Th e washdownwate r 1 s draine dbac k Int o Tan k 1 . Th e pollutio ncontro l system als o 1 s equippe dwit ha moistur e extracto r downstream

o f th e mis t eliminator . Th e moistur e extracto r wa s installe dafte r chromi c aci ddroplet s wer e observe dt o b e breakin g through th e mis t eliminator . A s anadditiona l precaution , th e stac k wa s replace d wit ha n inverte dU-shape dduc t tha t i s funnelle ds o tha t an y remainin g chromi c aci di n th e ai r strea m wil l imping e ou t an d drai nint o th e platin g tank . Th e clea nai r i s exhauste doutsid e th e building . V . Conclusion s Unite dMeta l Finishing , Inc. , i s a smal l jobsho ptha t perform s har d chromiu m electroplating . Althoug hth e operatin g parameter s o f th e platin g tank s ar e typica l o f conventiona l har dchromiu m platin g operation s an d th e typ e an d amoun t o f wor k woul dgenerat e chromiu m emission s adequat e fo r testing , severa l technica l issue s associate dwit hth e captur e an d contro l equipmen t wil l hav e t o b e resolve dbefor e emissio ntestin g coul db e performed . Th e technica l issue s includ e th e following : (1 ) makeu pai r supplie dt o th e platin g sho pdurin g th e winte r month s i s insufficien t an d significantl y

decrease s th e performanc e o f th e captur e system becaus e th e ga s fac e velocit y

acros s th e mis t eliminato r blade s i s significantl y reduce dbelow

desig nspecifications ; (2 ) ther e 1 s no t a sufficien t lengt h o f straigh t duc t a t th e inle t o f th e mis t eliminato r fo r emissio ntesting , an d(3 ) th e moistur e extracto r an d ductwor k downstream o f th e moistur e extracto r woul dhav e t o b e remove dan d replace dwit ha stac k extensio nfo r outle t testing . Also , th e cost s and logistic s o f retrofittin g th e mis t eliminato r wit ha doubl e se t o f blade s mus t b e evaluated . Th e mis t eliminato r ca n b e teste dwit ha singl e se t an d a doubl e se t o f wave-typ e blade s t o determin e th e effec t o f redundanc y onth e performanc e o f th e unit . Th e plan t i s presentl y workin g wit hKC H Services , Inc. , th e manufacture r an

d installe r o f th e ventilatio nsystem , t o correc t th e problem o f insufficien t makeu pair . Plan t personne l wer e very cooperativ e durin g th e visi t an d ar e willin g t o allow

emissio ntestin g o f th e mis t eliminato r i f th e technica l issue s discusse dabov e ca n b e resolved . 

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[Note : Durin g a telephon e conversatio nwit hMr . Strai t o f MR I o n Ma y 27 , 1987 , Mr . Churc hstate dtha t a secondse t o f blade s wa s installe d i nth e mis t eliminato r 1 nApri l 1987 , b y KC H Services , Inc . Mr . Churc h di dno t provid e an

y othe r comment s o nth e draf t repor t durin g thi s contact] .



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