1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 8468-7:2012Respiratory protectivedevices for use againstchemical, biological,radiological and nuclear(CBRN) agentsPart 7: Closed-circuit breathingapparatus SpecificationPublis
2、hing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 75421 0ICS 13.340.30The following BSI references relate to the work on this standa
3、rd:Committee reference PH/4Draft for comment 11/30246792 DCPublication historyFirst edition, April 2012Amendments issued since publicationDate Text affectedBS 8468-7:2012 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Description 15 Designation 26 Requ
4、irements 27 Marking 38 Information supplied by the manufacturer 3AnnexesAnnex A (normative) Test method for chemical agent permeation andpenetration resistance against distilled sulfur mustard (HD) and sarin (GB) 4Annex B (informative) Relationship between this British Standard and the basicsafety r
5、equirements of EU Directive 89/686/EEC Personal ProtectiveEquipment 9Bibliography 11List of figuresFigure A.1 HD agent droplet placement for CCBA facepiece 6Figure A.2 HD agent droplet placement between facepiece and cylinderthread 7List of tablesTable 1 Maximum acceptable levels of permeation and p
6、enetration 3Table A.1 Airflow characteristics for chemical agent permeation andpenetration resistance test method (HD) 8Table A.2 Airflow characteristics for chemical agent permeation andpenetration resistance test method (GB) 8Table B.1 Essential requirements for PPE Comparison between the PPEDirec
7、tive, Annex II and BS 8468-7 10Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii,pages 1 to 12, an inside back cover and a back cover.BRITISH STANDARD BS 8468-7:2012 The British Standards Institution 2012 iForewordPublishing informationThis is published by B
8、SI Standards Limited, under licence from The BritishStandards Institution, and came into effect on 30 April 2012. It was prepared byTechnical Committee PH/4, Respiratory protection. A list of organizationsrepresented on this committee can be obtained on request to its secretary.Relationship with oth
9、er publicationsBS 8468 is issued in nine parts: Part 1: Positive pressure, self-contained, open-circuit breathing apparatus Specification; Part 2: Negative pressure, air purifying devices with full face mask Specification; Part 3.1: Self-contained open-circuit compressed air breathing apparatusincor
10、porating a hood for escape Specification; Part 3.2: Air-purifying devices incorporating a hood for escape Specification; Part 4: Powered air-purifying respirators Specification; Part 5: Dual-mode apparatus Specification; Part 6.1: Positive-pressure compressed airline equipment Specification; Part 6.
11、2: Constant flow compressed airline equipment Specification; Part 7: Closed-circuit breathing apparatus Specification.NOTE This standard may be used in conjunction with BS 8467, which givescategorization, requirements and test methods for personal protective ensemblesagainst CBRN agents.Information
12、about this documentIncreased threat to civilians, emergency and support agencies from chemical,biological, radiological and nuclear (CBRN) agents has led to a need for suitablepersonal protective equipment (PPE). The lack of coverage of combined CBRNprotection in existing British Standards on PPE ha
13、s recently been identified. Thisstandard has been prepared to give requirements for such PPE.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Commentary, ex
14、planation and general informative material is presented insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Com
15、pliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARDBS 8468-7:2012ii The British Standards Institution 20121 ScopeThis British Standard specifies requirements for closed-circuit breathingapparatus (CCBA) intended to be used during firefighting, rescue, evacua
16、tion,escape, hazard containment and decontamination, and similar activities byemergency first responders (e.g. fire, ambulance, police, and associated civilianagencies and workers) in areas containing and contaminated by chemical,biological, radiological and nuclear (CBRN) agents.NOTE CCBA conformin
17、g to this standard might be suitable for use in situationsother than those involving the specific CBRN agents identified in the standard.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in thisdocument and are indispensable for its application. For dated
18、 references, onlythe edition cited applies. For undated references, the latest edition of thereferenced document (including any amendments) applies.BS EN 132, Respiratory protective devices Definitions of terms and pictogramsBS EN 134, Respiratory protective devices Nomenclature of componentsBS EN 1
19、36:1998, Respiratory protective devices Full face masks Requirements,testing, markingBS EN 137:2006, Respiratory protective devices Self-contained open-circuitcompressed air breathing apparatus with full face mask Requirements, testing,markingBS EN 145:1998, Respiratory protective devices Self-conta
20、ined closed-circuitbreathing apparatus compressed oxygen or compressed oxygen-nitrogen type Requirements, testing, markingBS EN 13274-1:2001, Respiratory protective devices Methods of test Part 1:Determination of inward leakage and total inward leakageBS EN 14593-1:2005, Respiratory protective devic
21、es Compressed air linebreathing apparatus with demand valve Part 1: Apparatus with a full mask Requirements, testing, marking3 Terms and definitionsFor the purposes of this part of BS 8468, the terms and definitions given inBS EN 132 and BS EN 134 and the following apply.3.1 full face masktight fitt
22、ing facepiece covering mouth, nose, eyes and chin3.2 closed-circuit breathing apparatusCCBAself-contained breathing apparatus which removes carbon dioxide from theexhaled air and adds oxygen or oxygen/nitrogen to the inhaled air for breathingby the wearer and is independent of the ambient atmosphere
23、4 DescriptionSelf-contained, closed-circuit breathing apparatus is designed and constructed tosupply the wearer with breathable air via an inhalation hose, connected to thefacepiece by a breathing connector. The exhaled air passes from the facepiecevia the breathing connector and exhalation hose bac
24、k to the CCBA.BRITISH STANDARD BS 8468-7:2012 The British Standards Institution 2012 15 DesignationTwo types of CCBA are described in this standard:a) Type 1: a device with inward leakage 0.01% suited to use in any BS 8467ensemble; andb) Type 2: a device with inward leakage 0.05% suited to use in an
25、y BS 8467ensemble except Category A.6 Requirements6.1 GeneralCCBA for use against CBRN agents shall conform to BS EN 145, and conform tothe inward leakage specified in 6.2 of this standard, and conform to thechemical agent penetration and permeation resistance specified in 6.3 of thisstandard.The fa
26、cepiece shall conform to BS EN 136:1998, class 3 for Type 1 CCBA andclass 2 or class 3 for Type 2 CCBA.6.2 Inward leakageNOTE The tests specified in this subclause require use of NaCl. If there is difficultygetting reliable results due to contamination from the soda lime used in CCBA, thetest may be
27、 performed with SF6 or corn oil.6.2.1 Type 1The maximum inward leakage shall be 0.01% when tested as a completesystem in accordance with BS EN 13274-1:2001, 8.4c).NOTE This requirement is more stringent than the one given in BS EN 136.Detection systems should take account of the increased sensitivit
28、y required.6.2.2 Type 2The maximum inward leakage shall be 0.05% when tested as a completesystem in accordance with BS EN 13274-1:2001, 8.4c).6.3 Chemical agent permeation and penetrationCCBA shall be resistant to chemical agents up to the maximum levels given inTable 1 when tested in accordance wit
29、h Annex A.BRITISH STANDARDBS 8468-7:20122 The British Standards Institution 2012Table 1 Maximum acceptable levels of permeation and penetrationAgent Maximum acceptable peakexcursionA)Maximum acceptablebreakthrough (concentrationintegrated over time)B)mg/m3mgmin/m3Distilled sulfur mustard (HD)(vapour
30、)simultaneous test with liquidHD0.60 6.0Distilled sulfur mustard (HD)(liquid)simultaneous test with HDvapour0.60 6.0Sarin (GB) (vapour) 0.087 2.1A)Three sequential test data points, with sample times of two minutes, at or above the maximum peak excursionlevel constitute a failure.B)The maximum accep
31、table breakthrough is calculated over the six-hour duration of the test.7 Marking7.1 Marking shall be in accordance with BS EN 145:1998 and BS EN 136:1998.7.2 In addition, each CCBA and facepiece conforming to this standard shall bepermanently marked with the designation and year of this standard, i
32、.e.BS 8468-7:20121).7.3 Sub-assemblies and components with considerable bearing on CBRNperformance shall be marked so that they can be identified.8 Information supplied by the manufacturer8.1 The information supplied shall be in accordance with BS EN 145:1998 andBS EN 136:1998.8.2 The information sh
33、all describe suitable procedures for decontamination.1)Marking BS 8468-7:2012 on or in relation to a product represents a manufacturersdeclaration of conformity, i.e. a claim by or on behalf of the manufacturer that theproduct meets the requirements of the standard. The accuracy of the claim is sole
34、lythe claimants responsibility. Such a declaration is not to be confused with third-partycertification of conformity.BRITISH STANDARD BS 8468-7:2012 The British Standards Institution 2012 3Annex A(normative)Test method for chemical agent permeation andpenetration resistance against distilled sulfurm
35、ustard (HD) and sarin (GB)NOTE This method is based on a method developed and described in NIOSHProcedure CCBN CBRN 11 (Draft for Discussion) 1. Other test set-ups that areidentical in principle but vary in detail may be used if they can be shown lead to thesame results.A.1 PrincipleThree CCBAs, inc
36、luding all components and accessories, are tested in each test,two conditioned in conformity with BS EN 14593-1:2005, 6.8.1,orBS EN 137:2006, 6.24, and one “as received”, including all components andaccessories, on an upper-torso manikin connected to a breathing machine. Threeare tested in an atmosp
37、here containing GB vapour, and three are tested in aseparate test, in an atmosphere containing HD vapour with liquid droplets ofHD applied to the surface of the apparatus. The peak excursion levels andbreakthrough levels are measured for these agents.NOTE It might be necessary to replace the oxygen
38、source with an external supplyof compressed air for the purpose of running an extended-duration test. If theoxygen source has been replaced, the alternative air supply needs to operate at thesame flow rate.A.2 MaterialsA.2.1 HD vapour.A.2.2 HD liquid.A.2.3 GB vapour.A.2.4 Dilute HD, to test the cali
39、bration of the continuous air monitoring system(A.3.4), at a concentration chosen to be at the mid-point of the continuousair-monitoring system calibration curve.A.3 ApparatusA.3.1 SMARTMAN2)(or equivalent), simulant agent resistant test manikin,tested, with helium, for leaks.NOTE These tests should
40、 be carried out when new and in accordance with thelaboratorys standard operating procedures for calibration.A.3.2 Two exposure chambers, both constructed of clear, chemical resistantsheets (e.g. Plexiglas or Lexan), forming an approximate 0.60-m-sided cube with:a floor capable of supporting the SMA
41、RTMAN (approximately 40 kg); aremovable front panel; four legs long enough to allow access for tubing and tothe SMARTMAN face-adjustment handle; an M12A1 military air purifyingcollective filter (or equivalent) installed in the top; ports in the side toaccommodate tubing for the challenge vapour and
42、clean purge air; an electricfan, inside, near the top front, to achieve a well-mixed challenge vapour. Onechamber is “clean” and only used to check for fit and leaks, the other is foragent exposure. The exposure chambers shall permit good mixing of the agentand air.2)SMARTMAN is the trade name of a
43、product supplied by ILC Dover, Frederica,Delaware, USA. This information is given for the convenience of users of this standardand does not constitute an endorsement by BSI of the product named. Equivalentproducts may be used if they can be shown to lead to the same results.BRITISH STANDARDBS 8468-7
44、:20124 The British Standards Institution 2012NOTE The chamber may be increased in size to accommodate the CCBA under test,taking care that the agent tested is not significantly dissipated in the increased airvolume. A test set-up that uses only one chamber may be used.A.3.3 Leak detector, capable of
45、 detecting aerosol particles at a concentration ofless than 0.001% of the challenge concentration (e.g. a challenge concentrationof 100 mg/m3mineral oil needs a detector capable of detecting 0.10 mg/m3).A.3.4 Continuous air monitoring system; capable of detecting GB and HD at thelevels required, bot
46、h in the test chamber (ambient) and in the nasal samplingport of the manikin (breakthrough).NOTE 1 The following equipment has been found suitable for ambient detection: an infrared absorption based detector; or a gas chromatograph, with a flame ionization detector (FID).NOTE 2 The following equipme
47、nt has been found suitable for breakthroughdetection: a gas chromatograph equipped with a hydrogen flame ionizationdetector (FID) and a preconcentrator tube (a small tube containing an adsorbentmaterial to scrub out agent vapour from air drawn through it).A.3.5 Agent delivery system, capable of deli
48、vering agent into an air stream at acontrolled rate, to create a challenge vapour at a specified concentration.A.3.6 Regulated airflow-temperature-humidity control system, supplied withlaboratory air and distilled water, and capable of supplying air at rates of(50 to 200) L/min 2%, relative humidity
49、 of (20 to 80)% 3%, and temperaturesof (20 to 30) C 3%.A.3.7 Breathing simulator, to produce a sinusoidal breathing pattern, adjustableup to a tidal volume (volume per breath) of 1.5 L.NOTE One method of achieving this is with a double pump, operated by a single,variable speed motor through a Scotch yoke (slotted link).A.4 PreparationA.4.1 Run a background characterization; connect the continuous air monitoringsystem (A.3.4) to a sampling port of the SMARTMAN (A.3.1) in the agentexposure cham
