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1、BRITISH STANDARD BS 7309:1990 EN 142:1989 Specification for Mouthpiece assemblies for respiratory protective devices This European Standard EN 142 has the status of a British Standard UDC 614.894.24:620.1:62-777 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10
2、:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7309:1990 This British Standard was published under the authority of the Board of BSI and comes into effect on 31 July 1990 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PSM/14 Draft for comment
3、81/35254 DC ISBN 0 580 18493 5 Cooperating organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following Western European countries. AustriaOesterreichisches Normungsinstitut Belg
4、iumInstitut belge de normalisation DenmarkDansk Standardiserungsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandIcelandic Council for Standardization IrelandNati
5、onal Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection des travails et des mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugues da Qualidade SpainInstituto Espaol de Normalizacin SwedenStand
6、ardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006
7、, Uncontrolled Copy, (c) BSI BS 7309:1990 BSI 12-1999i Contents Page Cooperating organizationsInside front cover National forewordii Brief history2 Introduction3 1Object and field of application3 2References3 3Definition and description3 4Requirements3 5Testing5 6Marking5 7Instructions for use6 Nati
8、onal appendix AInside back cover National appendix BInside back cover Figure 1 Scheme of exhalation valve leakage test box6 Figure 2 Scheme of test rig for valve leakage using a single cylinder machine7 Figure 3 Scheme of test rig for valve leakage using a twin cylinder breathing machine8 Licensed C
9、opy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7309:1990 ii BSI 12-1999 National foreword This British Standard has been prepared under the direction of the Personal Safety Equipment Standards Policy Committee and is
10、 the English language version of EN 142 “Respiratory protective devices: mouthpiece assemblies: requirements, testing, marking”, published by the European Committee for Standardization (CEN). EN 142 was produced as a result of international discussions in which the United Kingdom took an active part
11、. There was previously no equivalent British Standard to EN 142 although reference is made to mouthpieces in BS 4667-1:1974. BS 4667-1 will be withdrawn when EN 136 and EN 145 have been published as British Standards. A British Standard does not purport to include all the necessary provisions of a c
12、ontract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 t
13、o 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:
14、40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 142 March 1989 UDC 614.894.24:620.1:62 777 Key words: Respiratory protective equipment, accident prevention, end pieces, specifications, tests, marking English version Respiratory protective devices
15、: Mouthpiece assemblies: Requirements, testing, marking Appareils de protection respiratoire: Ensembles embouts buccaux; Exigences, essais, marquage Atemschutzgerte; Mundstckgarnituren; Anforderungen, Prfung, Kennzeichnung This European Standard was accepted by CEN on 26 September 1988. CEN members
16、are bound to comply with the requirements of the CEN/CENELEC Common Rules which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on a
17、pplication to the CEN Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to CEN Central Secretari
18、at has the same status as the official versions. CEN members are the national standards organizations of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committ
19、ee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels CEN 1989. Copyright reserved to all CEN members Ref. No. EN 142:1989 E Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 1
20、0:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 142:1989 BSI 12-1999 2 Brief history This Draft European Standard was drawn up by CEN/TC 79 “Respiratory Protective Devices”, the secretariat of which is held by DIN. In 1975 the Sub-Group 3 “Facepieces” (SG 3) with DIN secretariat started work o
21、n this document. At the plenary meeting of CEN/TC 79 in the Hague in November 1978 the draft proposal was presented to CEN/TC 79 and unanimously accepted. Following this it was submitted to the secretariat of CEN/TC 79 for publication as Draft European Standard. In January 1981 the Draft European St
22、andard prEN 142 was circulated by the CEN Central Secretariat in Brussels to all CEN Members for vote and comments. Within the voting period 9 Members approved and 3 Members disapproved the document. The detailed comments received were discussed and decided on during the following meetings of SG 3.
23、Since almost all comments could be accommodated the present document was submitted to the CEN Members for formal vote in June 1988. The result was positive. In accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denma
24、rk, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 142
25、:1989 BSI 12-19993 Introduction A given respiratory protective device can only be approved when the individual components satisfy the requirements of the test specification which may be a complete standard or part of a standard, and practical performance tests have been carried out on complete appar
26、atus where specified in the appropriate standard. If for any reason a complete apparatus is not tested then simulation of the apparatus is permitted provided the respiratory characteristics and weight distribution are similar to those of the complete apparatus. 1 Object and field of application This
27、 European Standard refers to mouthpiece assemblies for respiratory protective devices, except escape apparatus and diving apparatus. It specifies minimum requirements for mouthpiece assemblies for use as part of respiratory protective devices. Laboratory and practical performance tests are included
28、for the assessment of compliance with the requirements. 2 References EN 148-1:1987, Respiratory protective devices; Threads for facepieces; Standard thread connection. EN 148-2:1987, Respiratory protective devices; Threads for facepieces; Centre thread connection. 3 Definition and description A mout
29、hpiece assembly is a device (facepiece), held by the teeth, sealing against the lips, and through which air is inhaled and exhaled while the nose is blocked up by a clip. Air enters the mouthpiece and passes directly into the mouth. The exhaled air flows back either through the facepiece connector i
30、nto the breathing apparatus (closed-circuit breathing apparatus, pendulum breathing) or directly to the ambient atmosphere, via the exhalation valve(s), in other types of respiratory protective devices. 4 Requirements 4.1 Material Exposed parts, i.e. those which may be subjected to impact during use
31、 of the apparatus, shall not be made of aluminium, magnesium, titanium or alloys containing such proportions of these metals as will, on impact, give rise to frictional sparks capable of igniting flammable gas mixtures. 4.2 Cleaning and disinfecting The materials used shall withstand the cleaning an
32、d disinfecting agents recommended by the manufacturer. 4.3 Replaceable components It is desirable that the components of the mouthpiece assembly should be replaceable. Testing according to 5.1. 4.4 Practical performance test The complete apparatus shall undergo practical performance tests under real
33、istic conditions. These general practical performance tests serve the purpose of checking the equipment for imperfections that cannot be determined by the tests described in other parts of this standard. In addition to the tests described in this standard details of practical performance tests for b
34、reathing apparatus are given in the relevant European Standard. Where a mouthpiece assembly is to be used for filtering devices testing shall be in accordance with the requirements for full face masks. The tests described in other standards have to be run with the exemption of speaking. Where in the
35、 opinion of the test station approval is not granted because practical performance tests show the apparatus has imperfections related to wearers acceptance, the test station shall provide full details of those parts of the practical performance tests which revealed these imperfections. This will ena
36、ble other test stations to duplicate the tests and assess the results thereof. 4.5 Inward leakage of facepiece A mouthpiece shall be so designed that inward leakage between lips and mouthpiece is negligible. In addition inward leakage may occur through exhalation valves (if fitted) and connections.
37、The inward leakage through the exhalation valve(s) shall not exceed 0,01 %. Testing according to 5.2. 4.6 Compatibility with skin and mouth Materials that may come into contact with the wearers skin and mouth shall not be known to be likely to cause irritation or any adverse effect to health. 4.7 He
38、ad harness 4.7.1 The head harness shall be designed so that the mouthpiece assembly can be donned and removed easily. Testing according to 5.1. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:40:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 142:1989 4 BSI
39、12-1999 4.7.2 The head harness shall be adjustable and shall hold the mouthpiece assembly firmly and comfortably in position. Testing according to 5.1. 4.8 Connector The connection between the rest of the apparatus and the mouthpiece assembly may be achieved by a permanent or special type of connect
40、ion or by a standard thread connection. Testing according to 5.1. 4.8.1 Standard thread connection This may be used as the mouthpiece assembly connection for all respiratory protective devices, except closed-circuit breathing apparatus and positive pressure demand breathing apparatus. If a standard
41、thread connection is used then the relevant requirements of EN 148-1:1987 shall be satisfied. 4.8.2 Centre thread connection This may be used as the mouthpiece assembly connection for closed-circuit breathing apparatus. If a centre thread connection is used then the relevant requirements of EN 148-2
42、:1987 shall be satisfied. 4.8.3 The connection between mouthpiece and connector shall be gastight and sufficiently robust. 4.8.4 All demountable connections shall be readily connected and secured, where possible by hand. Any means of sealing used shall be retained in position when the connection is
43、disconnected during normal maintenance. 4.8.5 Correct and reliable connection between facepiece and other parts of the respiratory protective device shall be assured. 4.9 Inhalation and exhalation valves Valve assemblies shall be such that they can be readily maintained and correctly replaced. It sh
44、all not be possible to fit an exhalation valve assembly into the inspiratory circuit or an inhalation valve assembly into the expiratory circuit. Normally a mouthpiece assembly with centre thread connection shall not have valves. Testing according to 5.1. 4.9.1 Inhalation valve(s) 4.9.1.1 A mouthpie
45、ce assembly except one with a centre thread connection should preferably be provided with one or more inhalation valve(s). If a standard thread type of connection is used an inhalation valve shall be incorporated in the mouthpiece assembly. If a mouthpiece assembly has to be used with filters it sha
46、ll be provided with an integral inhalation valve, if there is no valve in the filter. 4.9.1.2 Inhalation valve(s) shall function correctly in all orientations. 4.9.2 Exhalation valve(s) 4.9.2.1 Exhalation valve(s) shall function correctly in all orientations. 4.9.2.2 A mouthpiece assembly with a sta
47、ndard thread connection shall have at least one exhalation valve to allow the escape of exhaled air and, where applicable, any excess air delivered by the air supply. 4.9.2.3 The exhalation valve(s) shall be protected against dirt and mechanical damage and shall be shrouded or shall include any othe
48、r device that may be necessary to comply with 4.5. 4.9.2.4 The exhalation valve(s) shall continue to operate correctly after a continuous exhalation flow of 300 L/min over a period of 1 min. 4.10 Breathing resistance Testing according to 5.3. 4.10.1 The breathing resistance of a mouthpiece assembly
49、shall not exceed the values given in 4.10.2 and 4.10.3 respectively. 4.10.2 With standard thread connection The breathing resistance shall not exceed 1,5 mbar1) for inhalation and 3,0 mbar for exhalation (25 2 L/min with breathing machine or 160 L/min continuous flow). The inhalation resistance shall not exceed 0,5 mbar at 30 L/min continuous flow and 1,0 mbar at 95 L/min continuous flow. 4.10.3 With centre thread connection The breathing resistance shall not exceed 0,6 mbar for inhalation or exhalation. This requirement does not apply to mouthpiece assem
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