# OAR Box 1500 Prepped by Ollie Stewart



## Document

Number: 

# 78 ) ll-C-10 4 Docket Number: 

# A-94-5 2

Printed 8/5/20081:51:30PM Sheet 78of 343 P. 1P. 2

..« th e Ji Wb *1r, if Sm. IS} PACIFI C ENVIRONMENTA L SERVICES , INC . 

# A-94-5 2 \\-C~lo-f Centra l Par k

Wes t 500 1 Sout h Miam i Boulevard , Suit e 30 0 P.O . Bo x1207 7 Researc h Triangl e Park , N C 27709-207 7 (919)941-033 3 FA X(919 ) 941-023 4



## Mr . Bob Jame s Endur o Systems , Inc . 7100 OldKat

y Roa d Houston , T

X77024 Dea r Mr . James : Thepurpos eo

f thi s lette r i s to provid

eyou wit hinformationpertaining t o th emeasuremen t of styreneemission s frompultrusionoperations . Dr . MadeleineStru mofth e U.S . EP

Aagreedt o provid eyou wit hthi s informatio

nduring ou

r Octobe r 5,199 8 conferencecal l regarding th eEnduro facilit y i nFreeport , Texas (Vesc aPlastics) . Theinformationattachedt o thi s letter include s copie s ofth e following documents : -Metho d204 - Criteri afo

r an dVerificationof

aPermanen

t o r Temporar y Tota l Enclosur e -Method2 5 A- Determinationof Tota l Gaseou s Organic ConcentrationUsing aFlameIonizatio n Analyze r -Titl eV StyreneEmissionFacto r Test Report : Glasforms , Inc . (Non-Confidentia l Version ) Thefirst tw o documents discus s EP

Areferencetes t

method s tha

t your facilit y ma y employ to captur eandmeasur

estyreneemission s (.afte

r discussionwit

hth eappropriatepermitting authorities) . Thethir

ddocumen

t i s ates t repor t fo r styreneemission s testing conducteda t afacilit y inSa nJose , California . Thi s facilit y i s ownedan

doperatedby Glasforms , Inc . Method s simila r t o EP Areferenc emethod s 204 an d25 Awer eusedinth emeasuremen

t o f styreneemission s from a singlepultrusio nlinea

t thi s facility . If you hav ean

y question s abou

t theattachedinformation , pleas edo no t hesitateto contact m ea t (919 ) 941-033 3 or

Dr . MadeleineStru

ma t (919 ) 541-2383 . Sincerely , PACIFIC ENVIRONMENTA LSERVICES , INC . Rober t M . Jemison Environmenta

l Consultan

t cc : MadeleineStrum , EP

A Attachment s (3 )

WASHINGTON , D.C . •RESEARC H TRIANQL E PARK, N C •LO S ANGELES . C A•CINCINNATI . O H s§V 

# ±P. 3

EMISSIO N MEASUREMENT TECHNICA L INFORMATIO

N CENTER NSP S TES T METHO D

METHOD25A-DETERMINATI0 N OF TOTA

L GASEOU S ORGANI C CONCENTRATIO

N USIN GA FLAM E IONIZATIO

N ANALYZER 1 . Applicabilit y an dPrincipl e 1. 1 Applicability . Thi s metho d applie s t o th e measuremen t o f tota l gaseou s organi c concentratio n o f vapor s consisting primaril yo f alkanes , alkenes , and/o r arene s (aromati c hydrocarbons) . Th e concentratio n i s expresse d i n term s o f propan e (or othe r appropriat e organi c calibratio n gas ) o r i n term s o f carbon . 1. 2 Principle . Aga s sampl e i s extracte d fromth e sourc e throug ha heate d sampl e line , i f necessary , an d glas s fibe r filte r t o a flam e ionizatio n analyze r (FIA) . Result s ar e reporte d a s volum e concentratio n equivalent s o f th e calibratio n ga s o r a s carbo n equivalents . 2 . Definition s 2. 1 Measuremen t Systems . Th e tota l equipmen t require d fo r th e determinatio n o f the ga s concentration . The systemconsist s o f the following majo r subsystems : 2.1. 1 Sampl e Interface . Tha t portio n o f the systemtha t i s use d fo r on e o r mor e o f th e following : sampl e acquisition , sampl e transportation , sampl e conditioning , o r protectio n o f th e analyze r fromth e effect s o f th e stac k effluent . 2.1. 2 Organi c Analyzer . Tha t portio n o f th e syste mtha t sense s organi c concentratio n and generate s a n outpu t proportiona l t o th e ga s concentration . 2. 2 SpanValue . Th e uppe r limi t o f a ga s concentratio n measuremen t rang e tha t i s specifie d fo r affecte d sourc e categorie s i n th e applicabl e par t o f th e regulations . Th e spa n valu e i s establishe d i n th e applicabl e regulatio n and i s usuall y1. 5 t o 2. 5 time s th e applicabl e emissio n limit . I f n o spa n valu e i s provided , us e a spa n valu e equivalen t t o 1. 5 t o 2. 5 time s th e expecte d concentration . Fo r convenience , the span valu e shoul d correspon d t o 10 0 percen t o f th e recorde r scale . 2. 3 Calibratio

nGas . Aknow

n concentratio n o f a ga s i n an appropriat e diluen t gas . 2. 4 Zer o Drift . Th e differenc e i n th e measuremen t syste mrespons e t o a zer o leve l calibratio n ga s befor e an d afte r a state d perio d o f operatio n durin g whic h n o unschedule d maintenance , repair , o r adjustmen t too k place . 2. 5 Calibrationdrift . Th e differenc e i n th e measuremen t syste mrespons e t o a midleve l calibratio n ga s befor e and afte r a state d perio d o f operatio n durin g whic hn o unschedule d maintenance , repai r o r adjustmen t too k place . 2. 6 Response Time . Th e tim e interva l froma ste p chang e i n pollutan t

Prepare d byEmissionMeasuremen t Branc hEMTI C TM-25 A Technica l Suppor t Division , OAQPS , EP AJun e 23 , 199 3



# 2yP. 4

EMTI C TM-25 AEMTI C NSP S TES T METHO D Pag e 2 concentratio n a t th e inle t t o th e emissio n measuremen t syste mt o th e tim e a t whic h9 5 percen t o f the corresponding fina l valu e i s reache d a s displaye d o n th e recorder . 2. 7 Calibratio

nError . The differenc e betwee n the ga s concentratio n indicate d b yth e measuremen t syste mand th e know n concentratio n o f th e calibratio n gas . 3 . Apparatus . Aschemati c o f an acceptabl e measuremen t syste mi s shown i n Figur e 25A-1 . Th e essentia l component s o f th e measuremen t syste mar e describe d below : 3. 1 Organi c Concentratio nAnalyzer . Aflame ionizatio n analyze r (FIA ) capabl e o f meetin g o r exceedin g th e specification s i n thi s method . 3. 2 Sampl e Probe . Stainles s steel , o r equivalent , three-hol e rak e type . Sampl e hole s shal l b e 4 m mi n diamete r o r smalle r and locate d a t 16.7 , 50 , and 83. 3 percen t o f th e equivalen t stac k diameter . Alternatively , a singl e openin g prob e ma yb e use d s o tha t a ga s sampl e i s collecte d fromth e centrall ylocate d 1 0 percen t are a o f th e stac k cross-section . 3. 3 Sampl e Line . Stainles s stee l o r Teflo n * tubin g t o transpor t th e sampl e ga s t o th e analyzer . The sampl e line shoul d b e heated , i f necessary , t o preven t condensatio n i n th e line . 3. 4 Calibratio

nValv e Assembly . Athre e wayvalv e assembl yt o direc t th e zer o and calibratio n gase s t o th e analyzer s i s recommended . Othe r methods , suc ha s quick-connec t lines , t o rout e calibratio n ga s t o th e analyzer s ar e applicable . 3. 5 Particulat e Filter . A n in-stac k o r a n out-of-stac k glas s fibe r filte r i s recommende d i f exhaus t ga s particulat e loadin g i s significant . A n out-of-stac k filte r shoul d b e heate d t o preven t an ycondensation . * Mentio n o f trad e name s o r specifi c product s doe s no t constitut e endorsemen t byth e Environmenta l Protectio n Agency . 3. 6 Recorder . Astrip-char t recorder , analo g computer , o r digita l recorde r fo r recordin g measuremen t data . Th e minimumdat a recordin g requiremen t i s on e measuremen t valu e pe r minute , Note : Thi s metho d i s ofte n applie d i n highl y explosiv e areas . Cautio n an d car e shoul d b e exercise d i n choic e o f equipmen t and installation . 4 . Calibrationan dOthe r Gases . Gase s use d fo r calibrations , fuel , and combustio n ai r (i f required ) ar e containe d i n compresse d ga s cylinders . Preparatio n o f calibratio n gase s shal l b e don e accordin g t o th e procedur e i n Protoco l No . 1 , liste d i n Citatio n 2 o f Bibliography . Additionally , th e manufacture r o f th e cylinde r shoul d provid e a recommende d shel f lif e fo r eac hcalibratio n ga s cylinde r ove r whic hth e concentratio n doe s no t chang e mor e than ± 2 percen t fro mth e certifie d value . Fo r calibratio n ga s value s no t generall yavailabl e (i.e. , organic s betwee n 1 and 1 0 percen t byvolume) , alternativ e method s fo r preparin g calibratio n ga s mixtures , suc ha s dilutio n systems , ma yb e use d wit hprio r approva l o f th e Administrator . Calibratio n gase s usuall yconsis t o f propan e i n ai r o r nitroge n and ar e determine d i n term s o f the span value . Organi c compound s othe r tha n propan e ca n



# XP. 5

EMTI C TM-25 AEMTI C NSP S TES T METHO D Pag e 3 b e use d following th e above guideline s and making the appropriat e correction s fo r respons e factor . 4. 1 Fuel . A4 0 percen t H 2 /6 0 percen t N 2 ga s mixtur e i s recommende d t o avoi d a n oxyge n synergis meffec t tha t reportedl yoccur s whe n oxyge n concentratio n varie s significantl yfroma mea n value . 4. 2 Zero Gas . Highpurit yai r wit hles s tha n 0. 1 part s pe r millio n byvolum e (ppmv ) o f organi c materia l (propan e o r carbo n equivalent ) o r les s tha n 0. 1 percen t o f th e spa n value , whicheve r i s greater . 4. 3 Low-leve l Calibratio nGas . A

n organi c calibratio n ga s wit ha concentratio n equivalen t t o 2 5 t o 3 5 percen t o f th e applicabl e spa n value . 4. 4 Mid-leve l Calibratio nGas . A

n organi c calibratio n ga s wit ha concentratio n equivalen t t o 4 5 t o 5 5 percen t o f th e applicabl e spa n value . 4. 5 High-leve l CalibrationGas . A n organi c calibratio n ga s wit ha concentratio n equivalen t t o 8 0 t o 9 0 percen t o f th e applicabl e spa n value . 5 . Measuremen t Syste m Performanc e Specification s 5. 1 Zer o Drift . Les s tha n ± 3 percen t o f th e spa n value . 5. 2 CalibrationDrift . Les s tha n ± 3 percen t o f spa n value . 5. 3 CalibrationError . Les s tha n ± 5 percen t o f th e calibratio n ga s value . 6 . Pretes t Preparation s 6. 1 Selectio

no f Samplin

g Site . Th e locatio n o f th e sampling sit e i s generall y specifie d b

yth e applicabl e regulatio n o r purpos e o f th e test ; i.e. , exhaus t stack , inle t line , etc . The sampl e por t shal l b e locate d a t leas t 1. 5 meter s o r 2 equivalen t diameter s upstreamo f th e ga s discharg e t o th e atmosphere . 6. 2 Locationo f Sampl e Probe . Instal l th e sampl e prob e s o tha t th e prob e i s centrall ylocate d i n the stack , pipe , o r duc t an d i s seale d tightl ya t th e stac k por t connection . 6. 3 Measuremen t Syste m Preparation . Prio r t o th e emissio n test , assembl e th e measuremen t systemfollowin g the manufacturer' s writte n instruction s i n preparin g th e sampl e interfac e and th e organi c analyzer . Mak e th e syste moperable . FI Aequipmen t ca n b e calibrate d fo r almos t an yrang e o f tota l organic s concentrations . Fo r highconcentration s o f organic s (>1. 0 percen t b yvolum e a s propane ) modification s t o mos t commonl yavailabl e analyzer s ar e necessary . On e accepte d metho d o f equipmen t modificatio n i s t o decreas e th e siz e o f th e sampl e t o th e analyze r throughth e us e o f a smalle r diamete r sampl e capillary . Direc t an d continuou s measuremen t o f organi c concentratio n i s a necessar yconsideratio n whe n determinin g an ymodificatio n design . 6. 4 CalibrationErro r Test . Immediatel yprio r t o th e tes t series , (withi n 2 hour s o f th e star t o f the test ) introduc e zer o ga s an d high-leve l calibratio n ga s a t th e calibratio n valv e assembly . Adjus t th e analyze r outpu t t o th e appropriat e levels , i f necessary . Calculat e th e predicte d respons e fo r th e low-leve l and



# 4-P. 6

EMTI C TM-25 AEMTI C NSP S TES T METHO D Pag e 4 mid-leve l gase s base d o n a linea r respons e lin e betwee n th e zer o and high-leve l responses . The n introduc e low-leve l an d mid-leve l calibratio n gase s successivel y t o the measuremen t system . Recor d the analyze r response s fo r low-leve l an d mid

leve l calibratio n gase s an d determin e th e difference s betwee n th e measuremen t syste m response s an

d th e predicte d responses . Thes e difference s mus t b e les s than 5 percen t o f the respective calibratio n ga s value . I f not , th e measuremen t systemi s no t acceptabl e and mus t b e replace d o r repaire d prio r t o testing . N o adjustment s t o th e measuremen t syste mshal l b e conducte d afte r th e calibratio n and befor e th e drif t chec k (Sectio n 7.3) . I f adjustment s ar e necessar ybefor e the completio n o f th e tes t series , performthe drif t check s prio r t o the require d adjustment s and repea t th e calibratio n followin g th e adjustments . I f multipl e electroni c range s ar e t o b e used , eac hadditiona l rang e mus t b e checke d wit ha mid-leve l calibratio n ga s t o verif yth e multiplicatio n factor . 6. 5 Respons e Tim

e Test . Introduc e Zer o ga s int o the measuremen t syste ma t th e calibratio n valv e assembly . Whe n th e syste moutpu t ha s stabilized , switc h quickl yt o th e high-leve l calibratio n gas . Recor d th e tim e fromth e concentratio n chang e t o the measuremen t systemrespons e equivalen t t o 9 5 percen t o f th e ste p change . Repea t th e tes t thre e time s and averag e th e results . 7 . EmissionMeasuremen t Tes t Procedur e 7. 1 Organi c Measurement . Begi n samplin g a t th e star t o f th e tes t period , recordin g time an d an yrequire d proces s informatio n a s appropriate . I n particular , not e o n the recording char t period s o f proces s interruptio n o r cycli c operation . 7. 2 Drif t Determination . Immediatel yfollowin g th e completio n o f th e tes t perio d and hourl ydurin g th e tes t period , reintroduc e th e zer o and mid-leve l calibratio n gases , on e a t a time , t o th e measuremen t systema t th e calibratio n valv e assembly . (Mak e n o adjustment s t o the measuremen t syste munti l afte r bot h the zer o an

d calibratio n drif t check s ar e made. ) Recor d th e analyze r response . I f th e drift.value s excee d th e specifie d limits , invalidat e th e tes t result s preceding th e chec k an d repea t th e tes t following correction s t o th e measuremen t system . Alternatively , recalibrat e th e tes t measuremen t systema s i n Sectio n 6. 4 an d repor t the result s using bot hset s o f calibratio n dat a (i.e. , dat a determine d prio r t o th e tes t perio d an d dat a determine d following th e tes t period) . 8 . Organi c Concentrationcalculation s Determin e the averag e organi c concentratio n i n term s o f ppm va s propan e o r othe r calibratio n gas . Th e averag e shal l b e determine d b yth e integratio n o f th e outpu t recordin g ove r th e perio d specifie d i n th e applicabl e regulation . I f result s ar e require d i n term s o f ppm va s carbon , adjus t measure d concentration s usin g Equatio n 25A-1 . C C = KC mea s Eq . 25A- 1 Where : C c = Organi c concentratio n a s carbon , ppmv . C moas = Organi c concentratio n a s measured , ppmv . K = Carbo n equivalen t correctio n factor .



# XP. 7

EMTI C TM-25 AEMTI C NSP S TES T METHO D Pag e 5

K = 2 fo r ethane . K = 3 fo r propane . K = 4 fo r butane . K = Appropriat e respons e facto r fo r othe r organi c calibratio n

gases . 9 . Bibliograph

y 1 . Measuremen t o f Volatil e Organi c Compounds-Guidelin e Series . U.S . Environmenta l Protectio n Agency . Researc hTriangl e Park , NC . Publicatio n No . EPA-450/2-78-041 . Jun e 1978 . p . 46-54 . 2 . Traceabilit yProtoco l fo r Establishin g Tru e Concentration s o f Gase s Use d fo r Calibratio n and Audit s o f Continuou s Sourc e Emissio n Monitor s (Protoco l No . 1) . U.S . Environmenta l Protectio n Agency , Environmenta l Monitoring and Suppor t Laboratory . Researc hTriangl e Park , NC . Jun e 1978 . 3 . Gasolin e Vapo r Emissio n Laborator yEvaluation-Par t 2 . U.S . Environmenta l Protectio n Agency , Offic e o f Ai r Qualit yPlannin g and Standards . Researc hTriangl e Park , NC . EM B Repor t No . 75-GAS-6 . Augus t 1975 .



# inP. 8

EMTI C TM-25 A EMTI C NSP S TES T METHO D Pag e 6 

# n o Heate d Sampl e Lin e 

# b J Pum p

Stac k

Figur e 25A-1 . Organi c Concentratio n Measuremen t System .



# n.P. 9



### METHOD204--CRITERI A FO RAN DVERIFICATIO

N OF A PERMANENT O

R TEMPORAR

YTOTAL ENCLOSUR E 1 . SCOP E AN

DAPPLICATIO

N Thi s procedur e i s use d t o determin e whethe r a permanen t o r temporar yenclosur e meet s th e criteri a fo r a tota l enclosure . An existin g buildin g ma yb e use d a s a temporar yo r permanent ' enclosur e a s long a s i t meet s th e appropriat e criteri a describe d i n thi s method . 2 . SUMMAR

YOF METHOD An enclosur e i s evaluate d agains t a se t o f criteria . I f th e criteri a ar e me t and i f al l th e exhaus t gase s fromth e enclosur e ar e ducte d t o a contro l device , the n th e volatil e organi c compound s (VOC ) captur e efficienc y(CE ) i s assume d t o b e 10 0 percent , and C E nee d no t b e measured . However , i f par t o f th e exhaus t ga s streami s no t ducte d t o a contro l device , C E mus t b e determined . 3 . DEFINITION S 3. 1 Natura l Draf t Opening (NDO) . Anypermanen t openin g i n th e enclosur e tha t remain s ope n durin g operatio n o f th e facilit y and i s no t connecte d t o a duc t i n whic ha fan i s installed . 3. 2 Permanen t Tota l Enclosur e (PE) . Apermanentl y installe d enclosur e tha t completel ysurround s a sourc e o f emission s suc htha t al l VO C emission s ar e capture d and containe d fo r discharg e t o a contro l device . 3. 3 Temporary

Tota l Enclosur e (TTE) . Atemporaril y installe d enclosur e tha t completel ysurround s a sourc e o f



# 8P.1 0

• s



### emission s suc htha t al l VO C emission s tha t ar e no t directe d

throug hth e contro l devic e (i.e . uncaptured ) ar e capture d byth e enclosur e and containe d fo r discharg e throug hduct s tha t allo w fo r th e accurat e measuremen t o f th e uncapture d VO C emissions . 3. 4 Building Enclosur e (BE) . An existin g buildin g tha t i s use d a s a TTE . 4 . SAFET Y An evaluatio n o f the propose d buildin g material s and th e desig n for.th e enclosur e i s recommende d t o minimiz e an ypotentia l hazards . 5 . CRITERI A

FO RTEMPORAR

YTOTA L ENCLOSUR E 5. 1 AnyND O shal l b e a t leas t fou r equivalen t openin g diameter s from

eac hVO C emittin g poin t unles s otherwis e .specifie d b yth e Administrator . 5. 2 An yexhaus t poin t fromth e enclosur e shal l b e a t leas t fou r equivalen t duc t o r hoo d diameter s fromeac hNDO . 5. 3 Th e tota l are a o f al l NDO' s shal l no t excee d 5 percen t o f th e surfac e are a o f th e enclosure' s fou r walls , floor , and ceiling . 5. 4 Th e averag e facia l velocit y(FV ) o f ai r throug hal l NDO' s shal l b e a t leas t 3,60 0 m/h r (20 0 fpm) . Th e directio n o f ai r flo wthroug hal l NDO' s shal l b e int o th e enclosure . 5. 5 Al l acces s door s an d window s whos e area s ar e no t include d i n sectio n 5. 3 an d ar e no t include d i n the calculatio n i n sectio n 5. 4 shal l b e close d durin g routin e operatio n o f th eP.1 1 

## 4

process . 6 CRITERI A

FO RA PERMANEN

T TOTAL ENCLOSUR E 6. 1 Same a s section s 5. 1 and 5. 3 throug h5.5 .

6. 2 Al l VO C emission s mus t b e capture d and containe d fo r discharg e throug ha contro l device . 7 . QUALIT YCONTROL 7. 1 Th e succes s o f thi s metho d lie s i n designin g th e TT E t o simulat e th e condition s tha t exis t withou t th e TT E (i.e. , th e effec t o f th e TT E o n th e norma l flo wpattern s around th e affecte d facilit yo r th e amoun t o f uncapture d VO C emission s shoul d b e minimal) . Th e TT E mus t enclos e th e applicatio n stations , coatin g reservoirs , and al l area s fromth e applicatio n statio n t o th e oven . Th e ove n doe s no t hav e t o b e enclose d i f i t i s unde r negativ e pressure . Th e NDO' s o f th e temporar yenclosur e an d a n exhaus t fa n mus t b e properl ysize d and placed . 7. 2 Estimat e th e ventilatio n rat e o f th e TT E tha t bes t simulate s th e condition s tha t exis t withou t th e TT E (i.e. , th e effec t o f th e TT E o n th e norma l flo wpattern s around th e affecte d facilit yo r th e amoun t o f uncapture d VO C emission s shoul d b e minimal) . Figur e 204- 1 o r th e followin g equatio n ma yb e use d a s a n aid . C£

_QG C GEq . 204- 1 QG C G + QI£F



# 1

0P.1 2



### Measur e th e concentratio n (C G 

### ) and flo wrat e (Q G 

### ) o f th e capture d ga s stream , specif ya saf e concentratio n (C F 

### ) fo r th e uncapture d ga s stream , estimat e th e CE , and the n us e th e plo t i n Figur e 204

- 1 o r Equatio n 204- 1 t o determin e th e volumetri c flo wrat e o f th e uncapture d ga s stream (Q F 

### ) . A n exhaus t fan tha t ha s a variabl e flowcontro l i s desirable . 7. 3 Monito r th e VO C concentratio n o f th e capture d ga s steam i n th e duc t befor e th e captur e devic e withou t th e TTE . T o minimiz e th e effec t o f tempora l variatio n o n th e capture d emissions , th e baselin e measuremen t shoul d b e mad e ove r a s lon g a time perio d a s practical . However , th e proces s condition s mus t b e th e same fo r th e measuremen t i n sectio n 7. 5 a s the yar e fo r thi s baselin e measurement . Thi s ma yrequir e shor t measurin g time s fo r thi s qualit ycontro l chec k befor e and afte r th e constructio n o f th e TTE . 7. 4 Afte r th e TT E i s constructed , monito r th e VO C concentratio n insid e th e TTE . Thi s concentratio n shoul d no t continu e t o increase , an d mus t no t excee d th e saf e leve l accordin g t o Occupationa l Safet yand Healt hAdministratio n requirement s fo r permissibl e exposur e limits . A n increas e i n VO C concentratio n indicate s poo r TT E design . 7. 5 Monito r th e VO C concentratio n o f th e capture d ga s stream i n th e duc t befor e th e captur e devic e wit hth e TTE . T o limi t th e effec t o f th e TT E o n th e process , th e VO C concentratio n wit hand withou t th e TT E mus t b e withi n 1 0 percent . I f th e



# I IP.1 3



### measurement s d o no t agree , adjus t th e ventilatio n rat e fromth e TT E unti l the yagre e withi n 1 0 percent . 

## 8 . PROCEDUR

E 8. 1 Determin e th e equivalen t diameter s o f th e NDO' s and determin e th e distance s fromeac hVO C emittin g poin t t o al l NDO's . Determin e th e equivalen t diamete r o f eac hexhaus t duc t o r hoo d and it s distanc e t o al l NDO's . Calculat e th e distance s i n

term s o f equivalen t diameters . Th e numbe r o f equivalen t diameter s shal l b e a t leas t four . 8. 2 Measur e th e tota l surfac e are a (A T 

### ) o f th e enclosur e and th e tota l are a (A N 

### ) o f al l NDO' s i n th e enclosure . Calculat e th e ND O t o enclosur e are a rati o (NEAR ) a s follows :

NEAR = - £Eq . 204- 2

/\rp



### Th e NEA R mus t b e £0.05 . 8. 3 Measur e th e volumetri c flowrate , correcte d t o standar d conditions , o f eac hga s streamexitin g th e enclosur e throug ha n exhaus t duc t o r hoo d usin g EP AMetho d 2 . I n som e case s (e.g. , whe n th e buildin g i s th e enclosure) , i t ma yb e necessar yt o measur e th e volumetri c flo wrate , correcte d t o standar d conditions , o f eac hga s streamenterin g th e enclosur e throug ha force d makeup ai r duc t usin g Metho d 2 . Calculat e F V usin g th e followin g equation :



# tzP. M



### FV = Eq . 204- 3

where : Q 0 

### = th e su

mo f th e volumetri c flo wfromal l ga s stream s exitin g th e enclosur e througha n exhaus t duc t o r hood . Qx

### = th e su

m o f th e volumetri c flo wfromal l ga s stream s int o th e enclosur e througha force d makeup ai r duct ; zero , i f ther e i s n o force d makeup ai r int o th e enclosure . A N

### = tota l are a o f al l NDO' s i n enclosure .

Th e F V shal l b e a t leas t 3,60 0 m/h r (20 0 fpm) . Alternatively, ' measur e th e pressur e differentia l acros s th e enclosure . Apressur e dro p o f 0.01 3 m mHg (0.00 7 in . H 2 

### 0 ) correspond s t o a n F V o f 3,60 0 m/h r (200 . fpm) . 8. 4 Verif ytha t th e directio n o f ai r flo wthroug hal l NDO' s i s inward . I f F

V i s les s tha n 9,00 0 m/h r (50 0 fpm) , th e continuou s inwar d flowo f ai r shal l b e verifie d usin g streamers , smok e tubes , o r trace r gases . Monito r th e directio n o f ai r flo w fo r a t leas t 1 hour , wit hcheck s mad e n o mor e tha n 1 0 minute s apart . I f F

V i s greate r tha n 9,00 0 m/h r (50 0 fpm) , th e directio n o f ai r flo wthroug hth e NDO s shal l b e presume d t o b e inwar d a t al l time s withou t verification . 

## 9 . DIAGRAM

S

/ *

# j i i i ii o. s 1. 0 Volumetri cFlowrat

Pof ruoitiv * Mission s ExhaustStrea m, i £ Volumetri cFlowrateo f Ga s Strea mDelivere d t o th eContro l Oevic aq G Figure204-1 . Th

ecrumple rchart .



# 4 -P.1 6



## Th eTitl eV StyreneEmissionFacto r Test Repor t ma y b efoun dindocke t numbe r A-94-52 , ite mII-B-17 , section2 of

Attachmen

t VI .