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1、BRITISH STANDARD BS EN 562:1995 Incorporating Amendments Nos. 1 and 2 Gas welding equipment Pressure gauges used in welding, cutting and allied processes The European Standard EN 562:1994 has the status of a British Standard UDC 621.791.03:681.2.084.83:531.787:620.1 Licensed Copy: sheffieldun sheffi
2、eldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 562:1995 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1995 BSI 12-1998 The
3、 following BSI references relate to the work on this standard: Committee reference WEE/18 Draft for comment 91/82473 DC ISBN 0 580 23157 7 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national s
4、tandards organizations of the following countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Orga
5、nization for standardization 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 PortugalIn
6、stituto Portugus de 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 9029October 1996Indicat
7、ed by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 562:1995 BSI 12-1998i Contents Page Cooperating organizations Inside front cover National forewordii Foreword2 Text of EN 5623 National annex NA (informativ
8、e) Committees responsibleInside back cover National annex NB (informative) Cross-references Inside back cover National annex NC (informative)Inside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 562:1995 ii BSI 12-1998 Nati
9、onal foreword This British Standard has been prepared under the direction of the Engineering Sector Board and is the English language version of EN 562:1994 Gas welding equipment Pressure gauges used in welding, cutting and allied processes, published by the European Committee for Standardization (C
10、EN). EN 562 was produced as a result of international discussion in which the United Kingdom took an active part. BS EN 562:1995 supersedes BS 6752:1986 which is withdrawn. Note to national foreword of BS EN 562 The NPT 1/4-18 taper thread has been in widespread use for many years in the UK by manuf
11、acturers of gas welding and cutting equipment for thread connections on pressure gauges. BS EN 562 does not specify the use of this thread and UK manufacturers should change to use G1/4 or R1/4 threads to meet the requirements of BS EN 562. To assist manufacturers in this change, a national annex NC
12、 has been added to BS EN 562 allowing the use of the NPT thread for a limited period. This national annex will remain valid until the new European Standard for 300 bar pressure regulators has been published which will replace BS 7650. Warning. Attention is drawn to the fact that while there is a clo
13、se similarity between NPT 1/4-18 and R1/4 threads there are differences on both the pitch and the diameters. Investigations have shown that if mismatching of these two threads occurs, there is a high possibility of gas leakage occurring. Please ensure that only compatible threads are used together.
14、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 immunity from legal obligations. Summary of pages This document comprises
15、a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 10, 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. Licens
16、ed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 562 September 1994 UDC 621.791.03:681.2.084.83:531.787:620.1 Descriptors: Welding equipment, welding, cutting, measuring instruments, pressure mea
17、surement, compressed gases, liquefied gases, manometers, equipment specification, dimensions, safety, tests, marking English version Gas welding equipment Pressure gauges used in welding, cutting and allied processes Matriel de soudage aux gaz Manomtres utiliss pour le soudage, le coupage et les tec
18、hniques connexes Gasschweigerte Manometer fr Schweien, Schneiden und verwandte Verfahren This European Standard was approved by CEN on 1994-09-16. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of
19、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 European Standard exists in three official versions (English, French, German). A version
20、 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 national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece
21、, 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 Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserv
22、ed to CEN members Ref. No. EN 562:1994 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 562:1994 2 BSI 12-1998 Foreword This European standard has been prepared by the Technical Committee CEN/TC 121, Welding, of which the secretariat is
23、held by DS. It is based on ISO/DIS 5171 Pressure gauges used in welding, cutting and allied processes, which is expected in the near future as ISO. CEN/TC 121 decided to submit the final draft for formal vote by its resolution 183/1993. The result was positive. This European Standard shall be given
24、the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 1995, and conflicting national standards shall be withdrawn at the latest by March 1995. In accordance with the CENELEC Internal Regulations, the following countries are bound to i
25、mplement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1Scope 3 2Normative references3 3Definitions3 4Pressure3 5Manufact
26、uring requirements4 6Safety7 7Marking7 8Tests7 Figure 1 Pressure gauge with bottom entry5 Figure 2 Pressure gauge with rear entry5 Figure 3 Thread connection6 Figure 4 Turning radius6 Figure 5 Accuracy test8 Figure 6 Torsion test8 Figure 7 Bend test9 Table 1 Maximum scale reading4 Table 2 Dimensions
27、 of pressure gauge with bottom entry5 Table 3 Dimensions of pressure gauge with rear entry5 Table 4 Maximum values of turning radius, R6 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 562:1994 BSI 12-19983 1 Scope This European Standard
28、specifies requirements for Bourdon-tube pressure gauges normally used with compressed gases at pressures up to 300 bar (30 MPa) in welding, cutting and allied processes. It also covers use for dissolved acetylene and for liquefied gases under pressure. It does not cover gauges for acetylene in acety
29、lene manufacturing plants. 2 Normative 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 publications are listed hereafter. For dated references, subsequent
30、amendments to or revisions of 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. EN 472, Pressure gauges Vocabulary. EN 585, Gas welding equipment Pressure
31、regulators for gas cylinders used in welding, cutting and allied processes up to 200 bar. EN 837-1, Pressure gauges Part 1: Bourdon- tube pressure gauges Dimensions, metrology, requirements and testing. EN 29539, Materials for equipment used in gas welding, cutting and allied processes (ISO 9539:198
32、8). ISO 7-1:1982, Pipe threads where pressure-tight joints are made on the threads Part 1: Designation, dimensions and tolerances. ISO 228-1:1982, Pipe threads where pressure-tight joints are not made on the threads Part 1: Designation, dimensions and tolerances. ISO 497:1973, Guide to the choice of
33、 series of preferred numbers and of series containing more rounded values of preferred numbers. ISO 4589:1984, Plastics Determination of flammability by oxygen index. ISO 7000:1989, Graphical symbols for use on equipment Index and synopsis. 3 Definitions For the purposes of this standard, the follow
34、ing definitions apply. 3.1 bourdon-tube pressure gauge a device incorporating elastic tubes with direct indication by pointer and graduated scale of the pressure being measured. (Bourdon-tube and pressure gauges: see EN 472) 3.2 case see EN 472 3.3 vent or blowout device see EN 472 3.4 window see EN
35、 472 3.5 dial the plate or area on which the scale is marked 3.6 scale see EN 472 3.7 pointer see EN 472 3.8 pointer stop a projection that stops the travel of the pointer 4 Pressure 4.1 Unit of pressure All pressures given are gauge (effective) pressures in bar. 4.2 Maximum scale reading Where prac
36、tical, the maximum scale reading for a particular gas pressure level shall be selected from the values given in Table 1. Where it is not practicable, the maximum scale reading shall be selected from the R10 series of preferred numbers or more rounded values given in ISO 497. Licensed Copy: sheffield
37、un sheffieldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 562:1994 4 BSI 12-1998 Table 1 Maximum scale reading 4.3 Maximum pressure mark The maximum operating pressure1) shall be indicated on the dial by a symbol or coloured mark and shall not exceed of the maximum scale
38、reading. 5 Manufacturing requirements 5.1 Materials 5.1.1 General The materials of the pressure gauge components liable to come into contact with the gas shall have adequate resistance to the chemical action of the gas under operating conditions. Bourdon tubes and other parts in contact with acetyle
39、ne gas shall conform to EN 29539. 5.1.2 Oxygen pressure gauges Bourdon tubes and other parts in contact with the gas shall be resistant to the chemical action of the oxygen and shall not be flammable under operating conditions. Thread sealants or sealing rings shall also be resistant to the chemical
40、 action of the oxygen and shall not be flammable under operating conditions. Components in contact with oxygen gas shall conform to EN 29539. Only lubricants suitable for use in oxygen at the service pressure and temperature shall be used. 5.2 Design and dimensions 5.2.1 Operational requirements 5.2
41、.1.1 Accuracy The pressure gauge accuracy shall be at least that of class 2,5, i.e. with a maximum deviation within the tolerance 2,5 % over the entire scale. 5.2.1.2 Strength Those parts of the pressure gauge that are in contact with the gas shall not burst or leak when tested to a pressure corresp
42、onding to 1,5 times the maximum scale reading (see 8.7). 5.2.1.3 Torsion After the application of the torque of 10 Nm according to 8.4.1 for a period of not less than 30 s, the pressure gauge shall satisfy the conditions of accuracy specified in 5.2.1.1. After the application of the torque of 25 Nm
43、according to 8.4.2 for a period of not less than 30 s, the pressure gauge shall be leak-tight at a pressure corresponding to the maximum scale reading. 5.2.1.4 Bending After the application of the load of 1 kN according to 8.5, the pressure gauge shall be leak-tight to atmosphere at a pressure corre
44、sponding to the maximum scale reading. 5.2.2 Dimensions The nominal size is based on the diameter of the casing (dimension A in Figure 1 and Figure 2). The values 50 and 63 are standardized. The dimensions shall be in accordance with Figure 1 and Table 2, or Figure 2 and Table 3 as appropriate. The
45、connecting dimensions are shown in Figure 3. The thread connection (see Figure 3) may be of the parallel type or taper type2), complying respectively with ISO 228-1:1982 class A or ISO 7-1:1982. Widths across flats, S, for wrenching shall conform to the dimensions shown in Figure 3. The maximum valu
46、es for the turning radius, R, shall be as given in Figure 4 and Table 4. Values in bar Pressure levelAcetyleneOxygen and other gases Low-pressure (LP)1 1,6 2,5 2,5 4 6 10 16 25 40 High-Pressureabc (HP) 40250 315 400 a 250 bar pressure gauge for use with CO2 and compressed gas cylinders filled to a m
47、aximum settled filling pressure of 185 bar at 15 C. b 315 bar pressure gauge for use with compressed gas cylinders filled to a maximum settled filling pressure of 230 bar at 15 C. c 400 bar pressure gauge for use with compressed gas cylinders filled to a maximum settled filling pressure of 300 bar a
48、t 15 C. 1) For pressure gauges used with regulators to EN 585:1994, the maximum pressure mark is normally P2 for low-pressure gauges and Pl for high-pressure gauges, as defined in EN 585:1994, Table 3. 2) Welding and cutting equipment manufacturers in some countries use the NPT taper thread. While t
49、here is close similarity between NPT and ISO 7-1 threads in pitch and diameter, there is significant difference in thread form. For safety reasons, mismatching threads should not be used. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 03:36:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 562:1994 BSI 12-19985 Table 2 Dimensions of pressure gauge with bottom entry 5.2.3 Dial and pointer The graduations and markings shall be clear and legible, and it shall be possible to read the indicat