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1、BRITISH STANDARD BS EN 250:1993 Respiratory equipment Open-circuit self-contained compressed air diving apparatus Requirements, testing, marking The European Standard EN 250:1993 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:04:23 GMT+00:00 2006, Unco
2、ntrolled Copy, (c) BSI BS EN 250:1993 This British Standard, having been prepared under the direction of the Personal Safety Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 May 1993 BSI 03-1999 The following BSI references re
3、late to the work on this standard: Committee reference PSM/27 Draft for comment 86/41012 DC ISBN 0 580 21275 0 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of th
4、e following countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Sta
5、ndardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus
6、 da Qualidade SpainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun,
7、 na, Wed Nov 01 05:04:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 250:1993 BSI 03-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions and description3 4Minimum equipment4 5Requirements4 6Testi
8、ng9 7Instructions for use12 8Marking13 Figure 1 Test arrangement for tensile force13 Figure 2 Apertometer14 Figure 3 Diagram of the apertometer15 Figure 4 Safety valve test16 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referencesInsid
9、e back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:04:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 250:1993 ii BSI 03-1999 National foreword This British Standard has been prepared under the direction of the Personal Safety Equipment Standards Policy Committee and is the E
10、nglish language version of EN 250:1993 Respiratory equipment Open-circuit self-contained, compressed air diving apparatus Requirements, testing, marking, published by the European Committee for Standardization (CEN). It is the first British Standard specification for open-circuit self-contained comp
11、ressed air diving apparatus, and no existing standard is superseded. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immun
12、ity 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 to 16, an inside back cover and a back cover. This Standard has been updated (see copyright date) and may have had amendments incorporated. This will
13、be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:04:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ? EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 250 March 1993 UDC 614.894.7:797.215:626.025.5:620.1:614.8 Descriptors: Per
14、sonal protective equipment, accident prevention, respiratory protective equipment, diving devices, compressed air, safety rules, tests, marking English version Respiratory equipment Open-circuit, self-contained, compressed air diving apparatus Requirements, testing, marking Appareils respiratoires A
15、ppareils de plonge autonomes air comprim et circuit ouvert Exigences, essais, marquage Atemgerte Autonome Leichttauchgerte mit Druckluft Anforderungen, Prfung, Kennzeichnung This European Standard was approved by CEN on 1993-03-16. CEN members are bound to comply with the CEN/CENELEC Internal Regula
16、tions 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 application to the Central Secretariat or to any CEN member. This Eur
17、opean 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 the Central Secretariat has the same status as the official versions. CEN members are the nat
18、ional standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr N
19、ormung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 250:1993 E Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:04:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ? EN 250:1993 BSI 03-1999 2 Foreword This European Standard has bee
20、n prepared by the Technical Committee CEN/TC 79 “ Respiratory protective devices” of which the secretariat is held by DIN. The text has been submitted to the formal vote and has been approved by CEN as a European Standard. This European Standard has been prepared under a mandate given to CEN by the
21、Commission of the European Communities and the European Free Trade Association, and supports essential requirements of EC Directive(s). This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 19
22、93, and conflicting national standards shall be withdrawn at the latest by September 1993. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, It
23、aly, Luxembourg, Norway, Portugal, Spain, Sweden, Switzerland, and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:04:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ? EN 250:1993 BSI 03-19993 Introduction A given self-contained open-circuit compressed air underwater breathin
24、g apparatus 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 apparatus where specified in the appropriate standard. If for a
25、ny reason a complete apparatus is not tested then simulation of the apparatus is permitted provided the respiratory characteristics are similar to those of the complete apparatus. 1 Scope This European Standard applies to self-contained open-circuit compressed air underwater breathing apparatus. The
26、 object of the requirements and tests set out in this European Standard is to ensure a minimum level of safe operation for underwater breathing apparatus to a maximum depth of 50 m. Laboratory and practical performance tests are included for the assessment of compliance with the requirements. 2 Norm
27、ative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of
28、 any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO 263, ISO inch screw threads General plan and selection screw, bolts and nuts Diameter range 0,06 to
29、6 in. EN 132, Respiratory protective devices; Definitions. EN 135, Respiratory protective devices; List of equivalent terms. EN 144-1, Respiratory protective devices; Gas cylinder valves; Thread connection for insert connector. EN 148-1, Respiratory protective devices; Threads for facepieces; Standa
30、rd thread connection. EN 148-2, Respiratory protective devices; Threads for facepieces; Centre thread connection. EN 148-3, Respiratory protective devices; Threads for facepieces; Thread connection M 45 3. DIN 477-1:1990, Gas cylinder valves rated for test pressures up to max. 300 bar; Types, sizes,
31、 connections, screw-threads. 3 Definitions and description For the purposes of this European Standard the following definitions apply. They are taken from EN 132 as far as possible: a) self-contained, open-circuit compressed air underwater breathing apparatus a self-contained, open-circuit compresse
32、d air underwater breathing apparatus is an apparatus which has a portable supply of compressed air carried by the diver, allowing him to breathe under water. Abbreviation: SCUBA the SCUBA, when ready to use, consists of a number of independent elements which comply with the requirements of this stan
33、dard and are functionally compatible with each other. When connected together, the complete SCUBA is designed to enable the wearer to breathe air on demand from a high pressure cylinder (or cylinders) via a demand regulator connected to a facepiece. The exhaled air passes, without re-circulation, fr
34、om the demand regulator via the exhalation valve to ambient water b) high pressure high pressure is the pressure inside the air cylinder(s) and between the air cylinder(s) and the pressure reducer c) medium pressure medium (intermediate) pressure is the pressure between the pressure reducer and the
35、demand valve d) low pressure low pressure is the pressure within the facepiece, approximately ambient pressure e) rated working pressure the rated working pressure is the maximum working pressure of the respective components f) reference pressure the reference pressure is the equilibrium pressure wh
36、ich exists in the facepiece when there is no respiratory gas flow g) respiratory pressure the respiratory pressure is the differential pressure in the facepiece relative to the reference pressure measured during inhalation and exhalation h) opening negative pressure (cracking pressure) the opening n
37、egative pressure is the respiratory pressure during inhalation required to open the inhalation valve Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:04:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ? EN 250:1993 4 BSI 03-1999 i) displaced (tidal) volume the displaced volume is the volume o
38、f breathing gas displaced by the breathing simulator during one half cycle (inhalation or exhalation) measured in litres k) breathing frequency the breathing frequency is the setting of the breathing simulator measured in cycles per minute l) respiratory minute volume (RMV) or ventilation rate () th
39、e RMV or is the product of the tidal volume and breathing frequency measured in litres per minute m) pressure volume loop the pressure volume loop is the diagram generated during one breathing cycle by plotting the respiratory pressure against the displaced volume n) work of breathing the work of br
40、eathing is the work expended during one breathing cycle measured in J/l. This work is, in general, proportional to the area bounded by the pressure volume loop. Work associated with positive pressures during inhalation does not count towards the total work of breathing o) facepiece a facepiece is a
41、device for connecting the apparatus to the wearer. It may be a mouthpiece assembly or a full face mask or a diving helmet p) mouthpiece assembly a mouthpiece assembly is a device usually held by the teeth, sealing against the lips and through which air is inhaled and exhaled q) full face mask a full
42、 face mask is a facepiece covering mouth, nose, eyes and chin and may be fitted with either a mouthpiece or an inner mask r) diving helmet a diving helmet is a facepiece covering the whole head and may be fitted with either a mouthpiece or an inner mask s) dead space the dead space is the volume of
43、the cavity formed between the mouth and the inhalation and exhalation parts 4 Minimum equipment 4.1 The SCUBA shall be equipped with at least the elements stated in a) to f) and include instructions for use mentioned in g). a) Air cylinder(s). b) Demand regulator. c) Safety device. d) Carrying frame
44、 or holding device, for air cylinder(s) with possibility to mount the harness. e) Carrying system. f) Facepiece: mouthpiece assembly or full face mask or diving helmet. g) Instructions for use. 4.2 Sub-assemblies The SCUBA may consist of sub-assemblies. 4.2.1 Package of air cylinders A package of ai
45、r cylinders shall consist of one or more air cylinders with carrying frame. 4.2.2 Demand regulator A demand regulator shall contain a pressure reducer (1st stage) and a demand valve (2nd stage). 4.2.3 Other components Other components of a SCUBA such as warning device, pressure gauge, body harness a
46、nd straps may be connected either with the package of air cylinders or with the demand regulator. 5 Requirements 5.1 Design The SCUBA and sub-assemblies shall be so designed and its components shall be so located that protection is achieved against mechanical damage caused by external influence and
47、that it is possible to perform the required pre-dive functional checks. V V Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 01 05:04:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ? EN 250:1993 BSI 03-19995 The combination of components shall not adversely affect the safe operation and use of app
48、aratus. In the case of several interconnected cylinders it shall be ensured that pressure equalization between opened cylinder valves and/or open reserve valves is not impeded. The SCUBA and sub-assemblies shall not have any projecting parts or corners and edges which may injure the diver. All parts
49、 which have to be actuated by the diver during use shall be accessible and controllable even when wearing protective gloves (3-finger, 6-7 mm, padding on either side). They shall be designed such that their setting cannot be altered inadvertently during use. Testing in accordance with 6.2 to 6.12. 5.2 Materials The materials used shall have adequate mechanical strength and feature sufficient resistance to changes caused by the effect of temperature individuall