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1、BS ISO 17491-1:2012BRITISH STANDARDBS ISO 17491-1:2012Protective clothing Test methods for clothing providing protection against chemicalsPart 1: Determination of resistance to outward leakage of gases (internal pressure test)bsl.makig pxcpllpncp a habt:National forewordThis British Standard is the
2、UK implementation of ISO 17491-1:2012.The UK participation in its preparation was entrusted to Technical Committee PH33l Chemical, Biological, Radioactive and Nuclear Personal Protective Equipment.A list of organizations represented on this committee can be obtained on request to its secretary.This
3、publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012. Published by BSI Standards Limited 2012ISBN 978 0 580 65183 0ICS 13.340.10Compliance with a British Standard cannot confer im
4、munity from legal obligations.This British Standard was published under the authority of the Standards Policyand Strategy Committee on 31 May 2012.Amendments issued since publicationDateText affectedBS ISO 17491-1:201?INTERNATIONALSTANDARDISO 17491-1ISO 2012First edition 2012-03-15Protective clothin
5、g Test methods for clothing providing protection against chemicals Part 1:Determination of resistance to outward leakage of gases (internal pressure test)Vdtements de protection M6thodes d,essai pour es v6tements fournissant une protection contre Ies produits Chimiques Partie 1: Determination de /a
6、resistance aux fuites des gaz vers eterieur (essai de pression interne)Reference numberISO 17491-1:2012(E)as。BS ISO 17491-1:2012ISO 17491-1:2012(E) ISO 2012 - All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be r
7、eproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO,s member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22
8、 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso orgPublished in SwitzerlandBS ISO 17491-1:2012ISO 17491-1:2012(E)ForewordISO (the International Organization for Standardizadon) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Interna
9、tional Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with
10、ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical co
11、mmittees is to prepare International Standards. Draft International Standards adopted by the technical mmittees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the po
12、ssibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 17491-1 was prepared by Technical Committee ISO/TC 94, Personal safety Protective clothing and equipment, Subcommittee SC 13,
13、Protective clothing.This edition of ISO 17491-1, together with ISO 17491-2, ISO 17491-3, ISO 17491-4 and ISO 17491-5, cancels and replaces ISO 17491:2002 which has been technically revised.ISO 17491 consists of the following parts, under the general title Protective clothing Test methods for clothin
14、g providing protection against chemicals: Part 1: Determination of resistance to outward leakage of gases (internal pressure test) Part 2: Determination of resistance to inward leakage of aerosols and gases (inward leakage test) Part 3: Determination of resistance to penetration by a jet Ofliquid (j
15、et test) Part 4: Determination of resistance to penetration by a spray Ofliquid (spray test) Part 5: Determination of resistance to penetration by a spray Ofliquid (manikin spray test) ISO 2012 - All rights reservediiiBS ISO 17491-1:2012ISO 17491-1:2012(E)IntroductionChemical protective clothing is
16、worn in conjunction with appropriate respiratory protective devices in order to isolate the body of the wearer from the environment. Several tests exist for determining the resistance of chemical protective clothing materials to either the permeation or penetration of gaseous or liquid chemicals.How
17、ever, the effectiveness of the overall protective clothing item in preventing exposure to chemical hazards depends on the integrity of the clothing item,s design in eliminating or reducing inward leakage of chemicals.The selection of the appropriate integrity test method will depend on the applicati
18、on of the chemical protective clothing and the exposure hazards present. Usually, the integrity test method will be specified in the overall chemical protective clothing specification.Evaluations of the chemical resistance of protective clothing material should be carried out using the appropriate t
19、est.ISO 6529 specifies methods for measuring the resistance of protective clothing materials to permeation by either liquids or gases. ISO 13994 specifies a method for determining the penetration resistance of protective clothing materials under conditions of ntinuous liquid contact and pressure, an
20、d can be applied to mic,o- porous materials, seams and assemblages. ISO 6530 specifies a procedure for measuring the penetration resistance of protective clothing materials from the impact and runoff of liquids. General protective clothing requirements are specified in ISO 13688.This International S
21、tandard specifies six different test methods for determining the resistance of complete protective clothing to inward leakage of either gaseous or liquid chemicals (protective clothing integrity). These test methods apply to either liquid or gaseous chemicals, or aerosols, and vary in the level of s
22、everity.The integrity test methods specified by this International Standard are as follows.This part of ISO 17491 specifies a method to be performed either at minimum test settings (Method 1) or at more rigorous test settings (Method 2), for assessing the resistance of a gas-tight suit to outward le
23、akage of air through, for example, essential openings, fastenings, seams, interface areas between items, pores and any imperfections in the construction materials.ISO 17491-2 specifies two different methods for determining the inward leakage of chemical protective suits in an aerosol environment (Me
24、thod 1) or a gaseous environment (Method 2). The procedure is applicable to gastight suits and non-gas-tight suits and provides an evaluation of chemical protective suit integrity, particularly with regard to leakage in the breathing zone, under dynamic nditions through the use of human subjects.ISO
25、 17491-3 specifies a method for determining the resistance of chemical protective clothing to penetration by jets of liquid chemicals. This procedure is applicable to clothing worn in situations where there is a risk of exposure to a forceful projection of a liquid chemical and which is intended to
26、be resistant to penetration under conditions that require total body surface cover (but not gas-tight clothing).ISO 17491-4 specifies a method to be performed either at minimum test settings (Method A low-level spray test) or at more rigorous test settings (Method B high-level spray test) for determ
27、ining the resistance of chemical protective clothing to penetration by sprays of liquid chemicals. This procedure applies to protective clothing which is intended to be worn when there is a risk of exposure to slight splashes of a liquid chemical or to spray palicles that coalesce and run off the su
28、rface of the garment, and to clothing which is intended to be resistant to penetration under conditions that require total body surface cover (but not gas-tight clothing).ISO 17491-5 specifies an alternative test method for determining the resistance to spray penetration. It uses a static manikin in
29、stead of a test subject; it also uses a different spray configuration and duration.The methods specified in this part of ISO 17491, ISO 17491-2, ISO 17491-3, ISO 17491-4 and ISO 17491-5 are not appropriate for evaluating the permeation or penetration of liquid chemicals through the material from whi
30、ch the clothing is made.# ISO 2012 - All rights reservedBS ISO 17491-1:2012ISO 17491-1:2012(E)Protective clothing Test methods for clothing providing protection against chemicals Part 1:Determination of resistance to outward leakage of gases (internal pressure test)1 ScopeThis part of SQ 17491specif
31、ies a method to be performed either at minimum test settings (Method 1) or at more rigorous test settings (Method 2)1 for assessing the resistance of a gas-tight suit to outward leakage of air through, for example, essential openings, fastenings, seams, interface areas between items, pores and any i
32、mperfections in the construction materials.This test does not simulate penetration by gases in an inward direction. Although the danger to te wearer arises from leakage in an inward direction, this test method assesses the outward leakage of air after the gastight suit has been inflated so as to str
33、etch the nstruction material, thereby enabling the test method to detect very small imperfections, such as holes, splits or tears.2 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.2.1assemblagepermanent fastening between two or more different garment
34、s, or between chemical protective clothing and accessories, obtained, for example, by sewing, welding, vulcanizing or gluing2.2chemical protective clothingcombined assembly of garments worn to provide protection against exposure to, or contact with, chemicals2.3chemical protective suitclothing worn
35、to protect against chemicals that covers the entire, or most of, the bodyNOTE 1 A chemical protective suit may comprise garments combined together to protect the body.NOTE 2 A suit may have various types of additional protection joined to itl such as a hood or helmet, bts and gloves.2.4connectionass
36、emblage or joint2.5garmentindividual component (of chemical protective clothing), the wearing of which provides protection against contact with chemicals to the part of the body that it covers2.6gas-tight suitone-piece garment with hood, gloves and boots which, when worn with self-contained or air-l
37、ine breathing apparatus, provides the wearer with a high degree of protection against harmful liquids, particles and gaseous or vapour contaminants2.7jointnon-permanent fastening between two different garments, or between chemical protective clothing and accessories2.8non-gas-tight suitone-piece gar
38、ment with hood, glove and boots which, when worn with or incorporating self-contained or airline breathing apparatus, provides the wearer with a high degree of protection against harmful liquids, particles and gaseous or vapour contaminations but does not meet an outward gas leakage test (internal p
39、ressure test)2.9penetrationflow of a chemical through closures, porous materials, seams, holes or other imperfections in a protective clothing material, on a non-molecular level2.10permeationprocess by which a chemical moves through a protective clothing material on a molecular levelNOTE Permeation
40、involvesa) sorption of molecules of the chemical into the contacted (outside) surface of a material,b) diffusion of the sorbed molecules in the material, andc) desorption of the molecules from the opposite (inside) surface of the material.2.11protective clothing materialany material or combination o
41、f materials used in an item of clothing for the purpose of isolating parts of the body from a potential hazard3 PrincipleAfter the suit has been inflated to a defined pressure, the extent of the subsequent leakage of air is assessed by recording the pressure reached after a defined period. Two diffe
42、rent sets of test pressures are provided.Method 1 uses an inflation pressure of 1 250 Pa and a test pressure of 1 000 Pa.Method 2 uses an inflation pressure of 1 750 Pa and a test pressure of 1 650 Pa.Method 1 is considered the minimum internal pressure test, but Method 2 provides a more rigorous de
43、termination of suit gas-tight integrity.4 Apparatus4.1 Source of compressed air. supplying air within the temperature range of (20 5) .4.2 Pressure-measuring device, capable of measuring up to (1 750 50) Pa with a sensitivity (readability) of 50 Pa.4.3 Vent valve-closure components, such as plugs or
44、 other means that are to be supplied for test purposes by the manufacturer.4.4 Stop clock or appropriate timing device, capable of measuring to the nearest second.5 Procedure5.1 Generala) Lay out the chemical protective suit (including attached gloves and footwear and full facemask, if appropriate)
45、on a suitable flat and clean surface away from any sources of heat and/or currents of air.b) Select an area for testing that is away from direct sunlight, open doors, drafts, heating and air conditioning registers.c) Perform a visual inspection of the chemical protective suit. Check the chemical pro
46、tective suit for seam in:egrity by visually examining the seams and gently pulling on the seams. Ensure that all air supply lines, filings, the visor or face shield, zippers and valves are secure and show no signs of deterioration.d) Remove any creases and folds in the suit as far as practicable.e)
47、Leave the suit for a minimum of 1 h at ambient temperature 3 .f) Inflate using the connections illustrated in Figure 1. Attach the pressure-measuring device (4.2) to the chemical protective suit or inflation system.g) Carefully blank off the valves and other openings on the chemical protective suit
48、with appropriate means of closure supplied by the manufacturer.h) Choose either Method 1 or Method 2.1 airline connector or inflation couple2 suit venting-valve adapter3 removable gloves4 face-plate sealFigure 1 Typical examples of suit modification to permit inflation5.2 Method 1 Minimum procedurea) Using compressed air (4.1) inflate the suit carefully to a pressure of