1、INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Contamination Control Division Reco ended Practice 08.2 IEST-RP-C08.2 High-eficiency Gas-phase Adsorber Cels INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Arlington Place One 2340 S. Arlington Heights Road, Suite 10 Arlington Heights, IL 6005-4
2、516 Phone: (847) 981-010 Fax: (847) 981-4130 E-mail: iestiest.org Web: ww.iest.org 2 Copyrighted material INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY IEST-RP-C08.2 IEST-RP-C08.2 INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Copyrighted material 3 This Recomended Practice is published by
3、the INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY to advance the technical and enginering sciences. Its use is entirely voluntary, and determination of its aplicability and suitability for any particular use is solely the responsibility of the user. This Recomended Practice was prepared by and
4、is under the jurisdiction of Working Group 08 of the IEST Con-tamination Control Division. Copyright 207 by the INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY First printing, October 207 ISBN 978-0-9787868-2-3 PROPOSAL FOR IMPROVEMENT: The Working Groups of the INSTITUTE OF ENVIRONMENTAL SCIENCE
5、S AND TECHNOLOGY are continualy working on improvements to their Recomended Practices and Reference Documents. Sugestions from those who use these documents are welcome. If you have a sugestion regarding this document, please use the online Proposal for Improvement form found on the IEST website at
6、ww.iest.org/proposal/form.html. INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Arlington Place One 2340 S. Arlington Heights Road, Suite 10 Arlington Heights, IL 6005-4516 Phone: (847) 981-010 Fax: (847) 981-4130 E-mail: iestiest.org Web: ww.iest.org 4 Copyrighted material INSTITUTE OF ENVIRONME
7、NTAL SCIENCES AND TECHNOLOGY IEST-RP-C08.2 IEST-RP-C08.2 INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Copyrighted material 5 High-eficiency Gas-phase Adsorber Cels IEST-RP-C008.2 CONTENTS SECTION 1 SCOPE AND LIMITATIONS.7 2 REFERENCES7 3 TERMS AND EFINITIONS.9 4 ALOWABLE MATERIALS.9 5 DESIGN1
8、6 CONSTRUCTION1 7 QUALITY ASURANCE REQUIREMENTS.16 8 PACKAGING AND SHIPING.18 FIGURE 1 TYPE I CEL1 2 TYPE I CEL.13 3 TYPE IV CEL14 A1 TYPICAL HOLDING RACK FOR TYPE I CEL19 A2 TYPICAL HOLDING RACK FOR TYPE I CEL.20 APPENDIX A RECOMENDED INSTALATION REQUIREMENTS.19 B CALCULATION OF RESIDENCE TIME OF A
9、DSORBER CELS21 C RECOMENDATIONS FOR ORDERING, MARKING, AND SHIPING2 D BIBLIOGRAPHY23 6 Copyrighted material INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY IEST-RP-C08.2 IEST-RP-C08.2 INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Copyrighted material 7 INSTITUTE OF ENVIRONMENTAL SCIENCES AND
10、 TECHNOLOGY Contamination Control Division Recommended Practice 008.2 High-eficiency Gas-phase Adsorber Cels IEST-RP-C008.2 1 SCOPE AND LIMITATIONS This Recomended Practice (RP) covers the design and testing of modular gas-phase adsorber cels in sin-gle pas or recirculating air-cleaning systems wher
11、e the ned for high-eficiency removal of gaseous con-taminants is a requirement. Thre types of modular cels are discused in detail. 1.1 Classification Adsorber cels described in this RP have ben clasi-fied into four types, namely: a) Type I (serpentine-bed) cel (aplication specific) b) Type I (flat-b
12、ed or tray-type) cel c) Type II (not discused in detail) d) Type IV (ve-bed) cel The four types of adsorber cels, though difering in their respective configurations, have comon features and components. 1.2 Adsorbent specifications Test requirements of this RP cover the cel as filed with granular act
13、ivated carbon. Typicaly, the carbon used in adsorber cels manufactured in acordance with this RP is sized to 8 16 US mesh. Performance of the cel for a specific contaminant is a function of the adsorbent used and the operating conditions. These conditions should be specified in adition to the re-qui
14、rements outlined in this RP. 1.3 Limitations This RP is limited to gas-phase adsorbers used for nu-clear, military, and heavy industrial aplications. These adsorber cels require prior qualification of the cel design and carbon filing method. The manufac-turer should perform production airflow resist
15、ance and leak testing. NOTE: Products and procedures discused in this RP may involve hazardous materials, operations, and equipment. This RP does not purport to adres al of the safety problems asociated with the use of the RP. It is the sole responsibility of the user to consult and establish apropr
16、iate safety and health practices and to determine the aplicability of regulatory limitations prior to use of this RP. 2 REFERENCES The folowing documents are incorporated into this RP to the extent specified herein. Users should aply the most recent editions of the references. 2.1 American National
17、Standards Institute (ANSI) ANSI A208.1 (199): Particle Board, Mat-Formed Wod 2.2 American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) ASHRAE Standard 34-204: Designation and Safety Clasification of Refrigerants (ANSI Aproved) 2.3 American Society of Mechanical Engineers
18、 (ASME) ASME/ANSI B1.1-203: Unified Inch Screw Threads (UN Rev through August 199): High-Eficiency, Particulate, Air Filter Units 2.8 Sources and Addresses ANSI American National Standards Institute 25 West 43rd Stret, 4th flor New York, NY 1036 USA Phone: 212-642-490 Fax: 212-398-023 Web: ww.ansi.o
19、rg APA Enginered Wod Asociation 701 South 19th Tacoma, WA 9846 USA Phone: 253-565-60 Fax: 253-565-7265 Web: ww.apawod.org ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Enginers, Inc. 1791 Tulie Circle NE Atlanta, GA 30329-2305 USA Phone: 404-636-840 Fax: 404-321-5478 Web: ww
20、.ashrae.org ASME American Society of Mechanical Enginers International 3 Park Avenue New York, NY 1016-590 USA Phone: 973-82-167 Fax: 973-82-1717 Web: ww.asme.org ASTM American Society for Testing and Materials International 10 Bar Harbor Drive West Conshohocken, PA 19428-2959 USA Phone: 610-832-958
21、5 Fax: 610-832-955 Web: ww.astm.org IPA Industrial Perforators Asociation 5157 Derhurst Crescent Circle Boca Raton, FL 3486 USA Phone: 561-47-751 Fax: 561-47-751 Web: ww.iperf.org UL Underwriters Laboratory 33 Pfingsten Road Northbrok, IL 6062-2096 USA Phone: 847-272-80 Fax: 847-272-8129 Web: IEST-
22、RP-C08.2 INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Copyrighted material 9 3 TERMS AND EFINITIONS The folowing terms have special meaning in the con-text of this RP. Other terms relating to the standard are given in ASTM D2652-05a. activated carbon An adsorbent of porous structure manufactur
23、ed by carbonization of organic material and treated by con-troled oxidation to increase the microporosity of the adsorbent, consisting mainly of the element carbon in a porous structure. adsorbent Any solid having the ability to concentrate significant quantities of other substances on its surface.
24、These solids typicaly include but are not limited to acti-vated carbon or impregnated activated carbon. adsorber cel A modular container for adsorbent, with provision for sealing into a mounting frame, that can be used sin-gularly or in multiples to build a system of any air-flow capacity. bafle A n
25、on-perforated member oriented substantialy per-pendicular to the direction of airflow, conected to a wal or divider of the cel, and having the purpose of preventing wal efect, chaneling, or both. bed or adsorber bed A layer of adsorbent contained betwen two perfo-rated shets spaced at a specified di
26、stance. Also, the asembly of perforated and non-perforated members that comprises the volume into which the adsorbent is packed. blank or blank area A non-perforated area within the perforated portions of a perforated shet or scren. chalenge To expose a filter, adsorber, or other air-cleaning device
27、 to an aerosol or tracer gas of known char-acteristics, under specified conditions, for the pur-pose of testing. chaneling The disproportionately greater flow of a gas or vapor through pasages or areas of lower resistance that may ocur within a bed, primarily via wal efects. filter, high-eficiency p
28、articulate air (HEPA) A throwaway, extended-medium, dry-type filter in a rigid frame, having a minimum particle-colection eficiency of 9.97% (that is, a maximum particle penetration of 0.03%) for 0.3-m particles of ther-maly generated DOP or specified alternative aerosol. impregnated activated carbo
29、n A family of carbonaceous substances manufactured by proceses that develop adsorptive properties. After activation, this carbonaceous substance is impreg-nated with a chemical compound or compounds to enhance the adsorption of selected molecular species from air or other gases that are not readily
30、adsorbed physicaly. leak, bypas The measure of the direct leakage through metal parts of the cel or the gasket of the cel due to manufactur-ing defects, bypasing of the adsorbent due to setling of the adsorbent in the bed, or inadequate cel design. The results are reported as percent refrigerant pen
31、etration. margin A solid (not perforated) area at the side, end of, or around the perforated area of a perforated shet or scren. penetration The ratio of the number of particles or molecules (usualy expresed in parts per milion pm) in the fluid exiting a filter to the number of particles or molecule
32、s (pm) in a given volume of the fluid enter-ing the filter. residence time or dwel time The calculated time that a contaminant gas or vapor remains in contact with the adsorbent at a specified volumetric flow rate, based on the net unbafled scren area and thicknes of the bed (se Apendix B). through
33、bolt A bolt or other fastener that pases through the ad-sorbent bed. wal efect Partial gas stream bypas of the adsorbent that ocurs along an unbafled metal-to-adsorbent interface. 4 ALOWABLE MATERIALS 4.1 Adsorbent Material and grade should be as specified by the cus-tomer, or, when not specified, a
34、s required to produce the loading and decontamination eficiency for the contaminant or combination of contaminants specified by the customer. For purposes of this RP, it is asumed that the adsorbent specified is screned to an 8 16 US mesh. 10 Copyrighted material INSTITUTE OF ENVIRONMENTAL SCIENCES
35、AND TECHNOLOGY IEST-RP-C08.2 4.2 Frame 4.2.1 Stainless steel A stainles stel frame should met the requirements of ASTM A240/A240M-06, Type 304 stainles stel with 2B finish and a minimum thicknes of US Stan-dard (US) Gauge No. 14, in conformance with ASTM A240/A240M-06 or ASTM A176-9(204). Other grad
36、es of stainles stels, such as 304L, may be used as agred upon by the customer and the suplier. 4.2.2 Plywod A plywod frame should be 19 m (0.75 in.) thick, conforming to exterior type, Grade AC Group 1, five-ply, solid-core jointed as per APA PS1, and fire-retardant treated. The flame spread clasifi
37、cation should be 25 or les when tested in acordance with ASTM-E-84-05e1. 4.2.3 Wood particle board A wod particle board frame should be 19 m (0.75 in.) thick for exterior aplication, with filer on both faces and conforming to Grade 2-M-2 with a minimum density of 721 kg/m3(45 lb/ft3), in acor-dance
38、with ANSI A208.1 (199). 4.2.4 Standard wod particle board A standard wod particle board frame should be 19 m (0.75 in.) thick, with filer on both faces conforming to Type 1, Grade l-M-3 with a mini-mum density of 705 kg/m3(4 lb/ft3), in acordance with ANSI A208.1 (199). This material is not rec-omen
39、ded for systems that are subject to high hu-midity, condensation, or direct weting. 4.2.5 Plastic material As a minimum, a plastic material frame should be 1.6 m (0.063 in.) thick and suitably reinforced for structural integrity. 4.3 Adsorbent bed screens 4.3.1 Metal material for metal frames Scren
40、material should met the requirements of ASTM A240/A240M-06, Type 304 stainles stel with 2B finish, and having a minimum thicknes of US Gauge No. 26. Perforation should be round and ar-ranged in patern No. 105 from the IPA standard guide Designers, Specifiers and Buyers Handbok of Perfo-rated Metals.
41、 Hole size diameter should be 1.14 m (0.045 in.) maximum and the open areas of the scren should be 30% minimum. Margins and blank areas should be as specified. 4.3.2 Plastic material for wod and plastic frames As a minimum, a plastic material frame should be 3.2 m (0.125 in.) thick and suitably rein
42、forced for structural integrity. 4.4 Gaskets and seal pads 4.4.1 General construction Gaskets used in general construction other than filter-to-frame seals should be a closed-cel, ozone-resistant, oil-resistant neoprene or silicone-ruber sponge, Grade SCE-43 in acordance with ASTM D1056-0. Other gas
43、ket materials may be used as agred upon by the customer and the suplier, and should met flamabil-ity characteristic requirements of the specified con-struction grade. 4.4.2 Filter-to-frame seal a) Gasket seal Gaskets should be oil-resistant closed-cel neoprene or sponge type, Grade 2C3 or 2C4, in ac
44、ordance with ASTM D1056-0. b) Fluid seal Fluid seals should be formed from a sealant such as a petroleum blend or silicone or urethane gel instaled into a perimeter chanel around the face of the ad-sorber. The fluid sealant should be self-adherent and self-healing. The fluid sealant should be flame
45、retardant per UL 94 and self-extinguishing, and should not give of toxic fumes when exposed to flame. c) Adhesives and sealants Adhesives or sealants may be used to fasten the gasket and to seal adsorber cels to the frame. Adhesives and sealants should be self-extinguishing after direct con-tact wit
46、h an open flame as evidenced by testing in ac-cordance with the spot flame test of UL 586. Adhesives and sealants should met flamability characteristic requirements of the specified construc-tion grade. 4.5 Threaded fasteners Fasteners should be UNC thread form, Clas 2 fit, in acordance with ASME/AN
47、SI B1.1-203. Nuts should be hexagonal with at least four ful threads and integral locking device or lock washer. Material should be coper aloy, having a minimum tensile strength of 60,00 psi, or stainles stel. The combination of mate-rials used for a mating nut and bolt should be a non-galing asembl
48、y. IEST-RP-C08.2 INSTITUTE OF ENVIRONMENTAL SCIENCES AND TECHNOLOGY Copyrighted material 1 5 DESIGN 5.1 General design The airflow rating should be agred upon by the cus-tomer and the suplier. The gasket, if required, should be securely fixed to the frame with adhesive. 5.2 Filter-to-frame seal 5.2.
49、1 Gaskets Gaskets should be constructed of materials as in sec-tion 4.4.2a. The edge of a gasket should not project beyond the outside edge of the frame. If gasket mate-rial joints are required, the joints should be joined in a maner that provides a high-integrity seal. This joining may be done by gluing dovetail joints or by vulcaniz-ing joints into a continuous material. There should be no more than four gasket joints per adsorber cel. The gasket seat and the gasket should be a minimum of 19 m (0.75 in.) in width and 6 m (0.24 in.) thick. The gas
