1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 13.340.30 ISBN 0-626-14771-9 SANS 50148-2:2003 Edition 2 EN 148-2:1999 Edition 2 SOUTH AFRICAN NATIONAL STANDARD Respiratory protective devices Threa
4、ds for facepieces Part 2: Centre thread connection This national standard is the identical implementation of EN 148-2:1999 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof ! private bag x191 pretoria 0001
5、 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa 2003 SANS 50148-2:2003 Edition 2 EN 148-2:1999 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee STANSA SC 5120.11D,
6、 Respiratory equipment, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This edition cancels and replaces the first edition (SABS EN 148-2:1987). EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 148-2February 1999ICS 13.340.30 Supersedes
7、 EN 148-2:1987Descriptors: respiratory protective equipment, personal protective equipment, accident prevention, junctions, threadedfittings, screw threads, dimensionsEnglish versionRespiratory protective devices - Threads for facepieces - Part 2:Centre thread connectionAppareils de protection respi
8、ratoire - Filetages pour picesfaciales - Partie 2: Raccord filetage centralAtemschutzgerte - Gewinde fr Atemanschlsse - Teil 2:ZentralgewindeanschluThis European Standard was approved by CEN on 8 January 1999.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate t
9、he conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in t
10、hree official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Aus
11、tria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCentral Secreta
12、riat: rue de Stassart, 36 B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 148-2:1999 EPage 2EN 148-2:1999ForewordThis European Standard has been prepared by the Technical Committee CEN/TC 79“Respiratory protectiv
13、e devices“, the secretariat of which is held by DIN.This European Standard supersedes EN 148-2:1987.This European Standard shall be given the status of a national standard, either bypublication of an identical text or by endorsement, at the latest by August 1999, andconflicting national standards sh
14、all be withdrawn at the latest by August 1999.Corrigendum EN 148-2:1987/AC:1992 was incorporated (see heading column 4 in table inclause 5), but with no other technical changes.This European Standard has been prepared under a mandate given to CEN by theEuropean Commission and the European Free Trade
15、 Association, and supports essentialrequirements of Directive 89/686/EEC.For relationship(s) with EU Directive(s), see informative Annex ZA, which is an integralpart of this standard.According to the CEN/CENELEC Internal Regulations, the national standardsorganizations of the following countries are
16、 bound to implement this European Standard:Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerlandand the United Kingdom.Page 3EN 148-2:19991 ScopeThis European Standard is applicable t
17、o centre threads for respiratory protective devices.This standard does not apply to diving equipment and to positive pressure demandbreathing apparatus.2 Centre thread connector (A) for CO2-absorbing cartridges2.1 Coupling elbow AA 2.2 GasketDimensions in millimetres Dimensions in millimetresFigure
18、1a) Figure 1b) Figure 23 Centre thread connector (B) for equipment connector3.1 Coupling elbow BADimensions in millimetres*) Specification see clause 5Page 4EN 148-2:19993.2 GasketDimensions in millimetresFigure 44 Thread bridge AB (for connector A and B)Dimensions in millimetres5 Dimensions for thr
19、ead 5/16Table 1Dimensions in millimetresThread limitsExternal thread Internal ThreadPitch Number ofthreadsper25,4ThreadheightThread MajordiameterPitchdiameterMinordiameterMajordiameterPitchdiameterMinordiameter5/16max. min. max. min. max. min. max. min. max. min. max. min.7,937 7,805 7,033 6,962 6,1
20、29 5,979 7,937 - 7,139 7,033 6,588 6,129 1,411 18 0,904NOTE: Thread 5/16 is described in British Standard BS 84-1956.*) Specification see clause 5Page 5EN 148-2:1999Annex ZA (informative)Clauses of this European Standard addressing essential requirements or otherprovisions of EU Directives.This Euro
21、pean Standard has been prepared under a mandate given to CEN by theEuropean Commission and the European Free Trade Association and supports essentialrequirements of EU Directive 89/686/EEC.WARNING: Other requirements and other EU Directives may be applicable to theproducts falling within the scope o
22、f this standard.The following clauses of this standard are likely to support requirements of Directive89/686/EEC, Annex II:EU Directive 89/686/EEC, Annex II: Clauses of this standard:1.2.1 2, 3, 41.3.3 2, 3, 42.8 2, 3, 42.10 2, 3, 43.10.1 2, 3, 4Compliance with the clauses of this standard provides one means of conforming with thespecific essential requirements of the Directive concerned and associated EFTAregulations.
