1、i ASTM D3b40=ll,W 0759510 00720b5 3-Designation:D 3640-91 AMERICAN SOCIETY MR TESTING AND MATERIALS 1916 RaceSt Philadelphia,Pa 19103 Reprinted from tha AnnualSeek of ASTM Standards.Copyright ASTM If not lilted In the current combined Index,will appear In the next edslon.An American National Standar
2、d Standard Guidelines for Emission Control in Solvent Metal-Cleaning Systems This standard is issued under the fixed designation D 3640;the number immediately following the designation indicafes the year of original adoption or,in the case of revision,the year of last revision.A number in parenthese
3、s indicates the year of last reapproval.A superscript epsilon(6)indicates an editorial change since the last revision or reapproval.1.Scope 1.1 These guidelines describe emission-control recom-mendations for two types of solvent metal-cleaning opera-tions:vapor-degreasing and cold-cleaning.1.2 The v
4、alues stated in inch-pound units are to be regarded as the standard.The values in parentheses are for information only.2.Application 2.1 Emission controls recommended by these guidelines apply to all production and maintenance vapor-degreasing operations.2.2 Guidelines for cold-cleaning operations a
5、pply to man-ufacturing as well as maintenance operations,including automotive,truck,and similar repair operations.3.Terminology 3.1 Dejnitions:3.1.1 cold cleaning-a metal-cleaning operation using a solvent or mixture of solvents other than water at a temper-ature below the initial boiling point of t
6、he system.3.1.2 vapor degreasing-a metal-cleaning operation em-ploying the condensation of solvent vapors for the purpose of removing soils.3.2 Descriptions of Terms:3.2.1 jreeboard for cold-cleaning tanks)-the distance from the top of the solvent or solvent drain to the top of the tank.3.2.2 freebo
7、ard or vapor-degreaser tanks)-the distance from the solvent vapor-air interface to the top of the basic degreaser tank.4.Emission Control of Solvent Yapor-Degreasing Opera-tions 4.1 The best emission-control technology should be ap-plied to each vapor-degreasing operation both for economic and pollu
8、tion abatement reasons.When waste solvent dis-posal is controlled as described in Section 6 and the vapor-degreasing operation and emission-control equipment is properly operated and maintained,the following measures represent the current state of the art in emission control:4.1.1 The use of open-to
9、p degreasers designed with a freeboard-to-degreaser-width ratio of 0.75 or greater and an automatic cover will achieve emission reduction.The freeboard need not be greater than 48 in.(1220 mm)for t These guidelines are under the jurisdiction of ASTM Committee D-26 on Halogenated Organic Solvents,and
10、 are the direct responsibility of Subcommittee D26.02 on Vapor Degreasing.Current edition approved Jan.25,1991.Published March 1991.Originally published as D 3640-78.Last previous edition D 3640-80.large vapor degreasers.Vapor-degreaser covers with less than 10 ft*(0.9 m*)of open-top area may be wor
11、ker-operated;operation of degreaser covers larger than 10 ft*in area will be facilitated by and must be powered according to many State Implementation Plans(SIPs).All degreaser covers must be closed when the degreaser is not cleaning parts,again required by SIPs 4.1.2 The installation of a freeboard
12、 chiller having the ability to remove a minimum 100 Btu/h*fi(8.8 W/m)of perimeter coil will achieve emission control,and may be combined with the techniques in 4.1.1.4.1.3 The use of standard carbon-adsorption units or thei equivalent,designed to ventilate openltop degreasers at a minimum rate of 50
13、 ft3/min*ft*(15 m3/min.m*)of open-top area and with a time-weighted average vapor concentra-tion less than 30 ppm in the exhaust duct of the carbon adsorber,will control emissions.Caution should be em-ployed to avoid excessive ventilation because this can increase solvent losses.4.1.4 The use of an
14、enclosed conveyorized vapor degreaser will usually reduce labor and solvent emissions when substituted for two or more open-top degreasers to do an equivalent workload.The freeboard for an enclosed,conveyorized degreaser should be at least 0.5 times the width of the degreaser up to a maximum of 36 i
15、n.(0.9 m).*The vertical conveyor speed must not exceed 11 ft/min(3.4 m/min).*The hood must fully enclose the exposed vapor-air interface except for entrance and exit silhouettes just large enough to permit work and conveyor passage(clearances not exceeding 4 in.(100 mm)per side are permitted).*Enclo
16、sed conveyorized degreasers include the following types:4.1.4.1 Monorail Degreasers,4.1.4.2 Cross-rod Degreasers,4.1.4.3 Vibra Degreasers,4.1.4.4 Elevator Degreasers,4.1.4.5 Mesh-Belt Degreasers,4.1.4.6 Ferris Wheel Degreasers,4.1.4.7 Archimedes Screw Degreasers(Rotary Drum Degreaser),and 4.1.4.8 Others that conform to the above general descrip-tion and equivalently reduce emissions.4.1.5 Alternatively,equivalent technology may be used to control emissions and satisfy state regulations.5.Emissio
