R307. Environmental Q ua lity, Air Quality. 

R307-335. Degreasing and Solvent Cleaning Operations. 

R307-335-1. Purpose. 

The purpose of this rule is to limit volatile organic 

compound (VOC) emission from degreasing anJ solvent 

cleaning operations. 

R307-335-2. Applicability. 

R307-335 applies to all degreasing or solvent 

cleaning operations that U' C V()Cs and that m·e .located ill 

PM l 0 and PM2.5 nonauainmcnt and ma.intenance plan areas as 

defined in 40 CFR 81.345 (July I, 20 l l ). 

R307-335-3. Definitions. 

The following additional definitions apply lo R307-

335: 

"Batch open lop vapor degreasing" me.ills the batch 

process of cleaning and removing grea-;e and soils from metal 

surfaces by condensing hot solvent vapor on the colder metal 

parts 

"ColJ ckanmg" means the batch process of cleaning 

(U1d removing soils from mdal surfaces by spraying. bmshing. 

flushing or immer ing \\hile maintaining the solvent below t~ 

hoiling point. 

"Conveyorizcd degreasing" means the rnntinuous 

process of cleaning and removing greases and soils from metal 

surfaces by using either cold or vaporized solvents. 

"Freeboard ratio" means the freeboard height 

(distance bct\1 een ,;olvcnt line and lop of container)dividcd by 

the: width of the degreaser. 

"Industrial solvent cleaning" means operations 

perfonncd using a liquid that contains any voe or 

combination of voes. which is used lo clean parts, tools, 

m,1chinc1;., cquiprncnl ttnd work areas. Clem1ing operations 

include, but rm:~ not limited lo, spraying, 11 iping. llu:;hing. and 

purging. 

"Open top vapor degrt':ao;cr" means the batch process 

of cleaning and removing soils from meta.I surfaces by 

condensing low solvent vapor on the colder metal parts. 

"Separation operation'' means <my process that 

separates a mixture of compound~ and solvents into two or 

more components. Specific mechanisms include extraction. 

ccmrifogation, filtration, and crystalli7.ation. 

"Solvent mernl cleaning" means the process of 

cleaning soils from metal surfaces by cold clem1ing, open top 

vapor degreasers, or conveyorizcd degreasing. 

R307-335-4. Cold Cleaning Facilities. 

No owner or operator shall operate a degreasing or 

sol\ cnl cleaning operation unless conditions in R.307-335-4( I) 

through (7) <U"C met. 

( l ) A cover shall he installed which shall remain 

closed except during actual loading. unloading or handling of 

parts rn clemicr. ·111e CO\ er shall be designed so that it can be 

easily operatt':d with one hand if: 

(a) The volatility of the solvent is greater than 2 kPa 

( 15 mm Ilg or 0.3 psi) measured at 38 degrees C ( 100 degrees 

F). 

(b ) ·n1e solvent is agitated. or 

(c) fb.: solvent is heated. 

(2) An internal draining rack for cleaned parts shall 

be installed on wh ich parts shall be drained until all d1ipping 

ceases. If the volatility of the solvent is greater than 4.3 kPa (32 

mm Hg at 38 degree~ (' ( 100 degrees F)), the drainage facility 

must be intcmaL so that parts are enclosed under the cover 

while draining. The drainage facility ma) be c:xtcrnal for 

appl ications where an internal type cannot tit into tht· cleaning 

system. 

(3) W<l<;te or used sC1lvent shall be stored in covered 

cont::iiners. 

( 4) Tanks, containers mid all associated equipment 

shall be maintained in good operating condition, and leaks shall 

be repaired immediately or the degreaser shall be shutdown. 

(51 Written procedures for the operation and 

maimenancc of the dcgrca~ing or solvent cleaning equipment 

shall be pennm1ently po~ied in an accessible and conspicuous 

location nc,1r the cq u iprnent. 

(6) If the solvent volatility is greater than 4.3 kPa 

(33 mm Jig or 0.6 psi) measured at 38 degrees C (100 degrees 

F), or if solvent is heated above 50 degrees C ( 120 degrees F), 

then one of the followi ng control devices shall be used: 

(a) Frccboard that give-; a freeboard ratio greater 

than 0.7: 

(b) Water cover if the solvent is insoluble in and 

heavier than water): or 

(c) Other s;stems of equivalent control. such as a 

rnfrigcrnted chiller or carbon adsorption. 

(7) If used. the solvent spray shall be a solid fluid 

stream at a pressure that docs not cause excessive splashing and 

trnl) not be a fine, atomi7ed or shower type spray. 

R307-335-5. Open Top Vapor Degreasers. 

Owners or operators of open top vapor degreasers 

shall. in addition to meeting the requirement.' of R307-3J5-

4(3 ). (4) and (5 1. 

( I) Equip the vapor degreaser with 3 cowr that can 

be opened and closed without disturbing the vapor zone. The 

cover shall be closed except when processing work loads 

through the degreaser; 

and 

(2) Install one of the following control devices: 

(a) Equipment necessary to sustain: 

(i) A frccboarJ ratio greater than or equal to 0.75, 

(ii) A powered cover if the degrea>er opening is 

greater than l square meter ( l 0.8 square feet). 

(b) Refrigerated chiller. 

(c) Enclosed design (cover or door opens only when 

the dry part is actually entering or exiting the degreaser). 

!dl Carbon adsorption system. with ventilation 

greater than or equal to 15 cubic meters per minute per sqmu-e 

meter (50 cubic feet per minute per sq uare foot) of air/vapor 

area when cover is open and exhausting less than 25 parts per 

mill.ion of solvent averageJ over one complete adsorption 

cycle: 

(3) Minimize solvent carryout by: 

(a) Rading paits to allo\v complete drainage. 

(b) Moving parts in and out of the degreaser at less 

than 3.3 meters per minute ( 11 feet per minutcj, 

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( c) Holding the parb in the vapor zone at least 30 

seconds or until condensation cease>. 

(d) Tipping out any pool of solvent on the deaned 

parts before removaI, and 

(c) Allo\ving the parts to dry 1vithin the dcgreastT fi..,r 

at least 15 seconds or until is ihly dry. 

( 4) Spray parts only in or below the vapor level. 

(5) Not use ventilation thns near the degreaser 

opening. nor provide ex.haust ventilation exceeding '.20 cubic 

meters per minute per square meter ( 65 cubic feet per minute 

per square fool) in degreaser open area. unless ncces5tuy to 

meet stak mid fcdcrnl occupational, health. and sa!Cty 

requirements. 

(6) Not dc;u-ease porous or absorbent materials. such 

as cloth. leather, wood or rope: 

(7) Not allow work loads to occupy more than half 

of the degreaser's open top area: 

{8i Ensure that solvent i~ not visually detectable in 

water exiting the water separator; 

(9) Install safety switches on the following: 

(a) Condenser flow switch and thcnnostat (shuts off 

sump hcat if condenser coolant is either not circulating or too 

warm): and 

(b) ')pray switch (>huts off spray pump if the vapor 

level drops excessively. t~ , greater than I 0 cm ( 4 inches). 

( I 0) Open top vapor degre;L<>crs with an open area 

,;mall er than one square meter ( 10.8 square foet) arc exempt 

from R307-335-5(2)(b) and (d). 

R307-335-6. Conveyorizcd Degreasers. 

Owners and operators of conveyorizcd degreasers 

, hal l. in addition to meeting the requirements of R307-335-

4(3). (·I) and (5) and R307-3 35-5(5 ): 

( 1) Install one of the fo llowing control devices for 

con veyorizcd degreasers with an air/vapor interface equal to or 

greater than two square meter> (2 J .5 square feet): 

(a) Refrigerated chiller; or 

(b) C<u-bon adsorption ~-ystem. with ventilation 

greater thrn1 or equal to 15 cubic mch:rs per minute per square 

mder (50 cubic fr·et per minute per sqmu-e foot) of air/vapor 

area when downtime c >ver.; are open, and cxriau>ting less than 

25 parts per million of >Olvcnt by volume. averaged over a 

<.:ompktc adsorption cycle. 

(2) equip the clcmicr with equipment. such as a 

drying tunnel or rotating (tumbling) hasket. sullicicnt to 

prevent cleaned parts from carrying out solvent liquid or vapor. 

(3) Provide downtime covers for closing off the 

entrance and exit during shutdown hours. Ensure that downtime cover is placed over entrances and exits of conveyorizcd 

degrea;;crs immediately after the conveyor and cxhau;1 are shut 

down and is removed just before they are started up. 

{'1) Minimi7c carryout emission~ by racking parts for 

best drainage and mainrnining the vertical conveyor speed at 

less than 3.3 rnetns per minute ( 11 feet per minute). 

(5) Minimile openings: Entrances and exits should 

silhouette work loads so that the averngc clearance (between 

par1s and the edge of the degreaser opening) is either kss than 

10 cm (4 inches) or le~s than 10% of the wid th of the opening. 

(6) Inswll sateiy witches on the following: 

(u) Condenser flow sw.irch and thermostat - shul<> off 

sump heat if coolmit is either not circulating or too warT!\: 

(b) Spray switch - huL~ off spray pump or conveyor 

if the vapor level drops excessively. i.e., greater than l 0 cm or 

(4 in..:hcs): and 

( C) Vapor level control thermostat - huts off sump 

l.:vcl if vapor level rises too high. 

17) Fnsurc that solvent is not 1 isihly detectable in 

the watt:r exiting the water separator. 

R307-335-7. Industrial Solvent Cleaning. 

(I) Exemptions. l11c requirements ofR307-335-7 do 

not apply to aerospace. wood furniture. shiphuilding and repair. 

Oat wood paneling., large appliance. metal furn iture. paper film 

and foil. plasti\: pm1s. miscellaneous metal parts coat and light 

autobody and truck assembly coatings. flexible packuf!ing. 

lithographic and letterpress printing materials and fiberglass 

hoat manufacturing material . 

(2) Operators of industrial solvent cleaning. that emit 

15 pnunds of VOCs or more per day. before control$. sha.ll 

reduce VOC cmi<;Sions from the u, e, handling. storage, <md 

disposal of clem1ing solvents and shop t<iweb b) implementing 

the following work practices: 

(a) Covering open container>: and 

(b) Storing used applicators mid shop towc.ls in 

closed fire proof containers. 

iJ) Owners or operators of industrial solvent 

cleaning operations shall limit voe emissions by either: 

(a) Using cleaning solutions with vapor pressure less 

than or equal to eight millimeters of rncrcur) (mm Hg) at 

20dewees C: 

(b) Using solvents with a VOC content of 0.42 

pounds pc:r gallon or less: or 

(c) Installing mi emission control system designed to 

have an overall control eflicic:ncy of at least 85%. 

RJ07-J35-8. Emission Control Systems. 

(I l ·n1c owner or operator of a control devict' shall 

maintain certification from th<' manufacrnn:r that the emission 

control system will attain at le<L~1 85% overall cflicicncy 

p~rfonnance and make tbc certification available to the director 

upon request. 

(2) Emission control syqems shall be operated and 

maint.a.incd .in accordmicc with the m<mufacturcr 

recommendations to maintain at leas( 85% overall eflicienC) 

perfonnanec. The owner or operator shall maint<1in for a 

minimum of two year.; records oC operating and maintcnm1cc 

sufficient to demonstrate that the equipment is being opaatcd 

nnd mainmined m accordance with the manufoeturcr 

recommendations. 

R307-335-9. Recordkeeping. 

The owner or operator shall maintain. for a minimum 

or two years, records of the solvent voe content applied and 

the phy:;ical ch<m1cteristi1:s that dt:monstratc compliance with 

R307-335. 

RJ07-335-10. Compliirnce Sd1edulc. 

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t, 1) All so\Jrccs withm Salt Lake and Davis counties 

sh.ill he in compliance \\1th R'rn7-335-3 through R:I07-i35-6 

and U07- 3~ 8 upon lht: dTcctivc date. 

(2\ All other :-ourccs defined in R307-335-2 shall be 

111 compliance with all scciions of thb ruk: by September 1. 

20 13. 

KEY: air pollution, degr easing. solvent cleaning 

Date of Enattmcnt or La st Substantive Amendment: 

January l. 2013 

Notic(' of Continuation: February I, 2012 

Authorizing, and Implemented or Inter preted Law: I 9-2-

104( I ){a) 

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