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. ISBN 978-0-626-19474-1 SANS 2503:2007Edition 1ISO 2503:1998Edition 2SOUTH AFRICAN NATIONAL STANDARD Gas welding equipment Pressure regulators for gas cyl
4、inders used in welding, cutting and allied processes up to 300 bar This national standard is the identical implementation of ISO 2503:1998 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof privat
5、e bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 2503:2007 Edition 1 ISO 2503:1998 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee Sta
6、nSA TC 5120.08, Welding and allied processes, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in May 2007. AReference numberISO 2503:1998(E)INTERNATIONALSTANDARDISO2503Second edition1998-04-01Gas welding e
7、quipment Pressureregulators for gas cylinders used inwelding, cutting and allied processesup to 300 barMatriel de soudage au gaz Dtendeurs pour bouteilles de gaz utilisspour le soudage, le coupage et les techniques connexes jusqu 300 barSANS 2503:2007This s tandard may only be used and printed by ap
8、proved subscription and freemailing clients of the SABS .ISO 2503:1998(E) ISO 1998All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronicor mechanical, including photocopying and microfilm, without permission
9、in writing from the publisher.International Organization for StandardizationCase postale 56 CH-1211 Genve 20 SwitzerlandInternet centraliso.chX.400 c=ch; a=400net; p=iso; o=isocs; s=centralPrinted in SwitzerlandiiContents Page1 Scope 12 Normative references 13 Definition . 14 Terminology . 25Units 4
10、5.1 Pressure . 45.2 Flow 45.3 Temperature 46 Manufacturing requirements 46.1 Materials 46.2 Design, machining and assembly . 47 Types of connections 67.1 Inlet connections 67.2 Outlet connections . 68 Physical characteristics 68.1 Pressures . 78.2 Flow rates 78.3 Equipment classes 88.4 Operating cha
11、racteristics . 89 Marking . 910 Instructions for use . 1011 Type test procedure 1011.1 General 1011.2 Test samples and necessary documents . 1111.3 Test conditions . 1111.4 Functional tests 1111.5 Mechanical tests 1411.6 Test for durability of markings . 16SANS 2503:2007This s tandard may only be us
12、ed and printed by approved subscription and freemailing clients of the SABS .ISO ISO 2503:1998(E)iiiForewordISO (the International Organization for Standardization) is a worldwidefederation of national standards bodies (ISO member bodies). The work ofpreparing International Standards is normally car
13、ried out through ISOtechnical committees. Each member body interested in a subject for whicha technical committee has been established has the right to be representedon that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS
14、Ocollaborates closely with the International Electrotechnical Commission(IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees arecirculated to the member bodies for voting. Publication as an InternationalStandard requires approval
15、by at least 75 % of the member bodies castinga vote.International Standard ISO 2503, was prepared by Technical CommitteeISO/TC 44, Welding and allied processes, Subcommittee SC 8, Equipmentfor gas welding, cutting and allied processing.This second edition cancels and replaces the first edition (ISO
16、2503:1983),which has been technically revised.SANS 2503:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SANS 2503:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATIONAL
17、STANDARD ISO ISO 2503:1998(E)1Gas welding equipment Pressure regulators for gas cylindersused in welding, cutting and allied processes up to 300 bar1 ScopeThis International Standard specifies requirements for single or two-stage pressure regulators for connections to gascylinders normally used for
18、compressed gases up to 300 bar1)(30 MPa), for dissolved acetylene, for liquefied petroleumgases (LPG), methylacetylene-propadiene-mixtures (MPS) and carbon dioxide (CO2) used in welding, cutting and alliedprocesses.2 Normative referencesThe following standards contain provisions which, through refer
19、ence in this text, constitute provisions of this InternationalStandard. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and parties toagreements based on this International Standard are encouraged to investigate the possibility of applying the mo
20、st recenteditions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid InternationalStandards.ISO 554:1976, Standard atmospheres for conditioning and/or testing Specifications.ISO 3253:1998, Gas welding equipment Hose connections for equipment for welding, c
21、utting and related processes.ISO 5171:1995, Pressure gauges used in welding, cutting and allied processes.ISO/TR 7470:1988, Valve outlets for gas cylinders List of provisions which are either standardized or in use.ISO 9090:1989, Gas tightness of equipment for gas welding and allied processes.ISO 95
22、39:1988, Materials for equipment used in gas welding, cutting and allied processes.3 DefinitionFor the purposes of this International Standard, the following definition applies.3.1 pressure regulator: Device for regulating a generally variable inlet pressure to an as constant as possible outletpress
23、ure.1) 300 bar relates to maximum cylinder charging pressure at 15 C.SANS 2503:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2503:1998(E)ISO24 TerminologyThe terms relating to pressure regulators are given in the key to figure 1 giv
24、en in table 1. The diagram of the pressureregulator is an example only.NOTES1 Parts 12, 13 and 14 are components of the relief valve2 Part 27 is an outlet valve and its installation is optional, see 6.2.4.3 Parts 4a and 4b of the drawing are examples and are not specified. Other types of inlet conne
25、ction pieces are also in use.Figure 1 Diagram of a pressure regulator and designation of its componentsSANS 2503:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO ISO 2503:1998(E)3Table 1 List of termsNo. English French German1 pressure
26、 adjusting screw vis de rglage Einstellschraube2 spring plate plateau de membrane Federteller3 body corps Krper4a inlet stem raccord dentre Eingangsstutzen4b inlet nut crou flottantraccord dentreSchraubverbindung5 inlet filter filtre dentre Eintrittsfilter6 seating washer joint de manomtre Manometer
27、anschlu-Dichtungsring 7 high-pressure gauge manomtre haute pression(amont)Hochdruckmanometer8 pressure regulator valve cap bouchon de clapet Regelventilkappe9 pressure regulator valve spring ressort de clapet Regelventilfeder10 spring centre appui mobile de centrage duressort de clapetRegelventil-Fe
28、derteller11 pressure regulator valve clapet Regelventil12 relief valve cap vis de rglage de la soupapede scuritEinstellschraube desAbblaseventils13 relief valve spring ressort de soupape de scurit Feder fr Abblaseventil14 relief valve seat clapet de soupape de scurit Abblaseventilsitz15 low-pressure
29、 gauge manomtre basse pression(aval) Niederdruckmanometer16 pressure regulator valve seat sige Regelventilsitz17 pressure regulator valve pin poussoir Regelventilstift18 diaphragm plate plateau dappui du poussoir Membranteller19 diaphragm membrane Membran 20 outlet connection piece raccord de sortie
30、(mamelon filet)Abgangsstutzen21 union nut crou de douille berwurfmutter22 hose tail douille porte-tuyau Schlauchtlle 23 diaphragm seal joint de membrane Membrangleitring 24 pressure regulator spring ressort de dtente Stellfeder25 pressure regulator cover couvercle Federdeckel26 pressure regulator sp
31、ring plate appui mobile de centrage duressort de dtente Stellfederteller 27 outlet valve robinet de sortie AbsperrventilSANS 2503:2007This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 2503:1998(E)ISO45 Units5.1 PressureThe pressures measure
32、d are gauge pressures2)and are expressed in bar.5.2 FlowFlow rates are measured in cubic metres per hour (m3/h) at normal conditions3)taking into account the relevant conversioncoefficient for the gas used (see table 2).Table 2 Conversion coefficient, UConversion coefficientTest gas air oxygen nitro
33、gen argon hydro-genhelium acety-leneLPG,e.g.propaneCO2air 1 0,950 1,02 0,851 3,81 2,695 1,05 0,800 0,808nitrogen 0,983 0,930 1 0,837 3,75 2,65 1,03 0,784 0,792Conversion coefficient, U, is based on the formula:U =gg01whereg0is the specific weight of test gas;g1is the specific weight of gas used.5.3
34、TemperatureTemperatures are measured in degrees Celsius.6 Manufacturing requirements6.1 MaterialsMaterials for pressure regulators shall conform to the requirements of ISO 9539.6.2 Design, machining and assembly6.2.1 Oxygen regulatorsRegulators for oxygen shall be designed, machined and manufactured
35、 such that internal ignition does not occur (see 11.5.3).All components and accessories shall be thoroughly cleaned and degreased before assembly.2) Pressure exceeding atmospheric pressure.3) Normal conditions are given in ISO 554.SANS 2503:2007This s tandard may only be used and printed by approved
36、 subscription and freemailing clients of the SABS .ISO ISO 2503:1998(E)56.2.2 Acetylene regulatorsRegulators for acetylene shall be designed and manufactured so that the outlet pressure shall not exceed 1,5 bar.6.2.3 FilterA dust filter, having an effective cross-section compatible with the discharg
37、e, shall be mounted within the pressure regulatorupstream of the pressure regulator valve. The filter shall not be removable without the use of a tool. The filter shall retainparticles greater than or equal to 0,1 mm.6.2.4 Outlet valvePressure regulators can be fitted with an outlet valve. When fitt
38、ed, the spindle shall be captive.6.2.5 Pressure adjusting deviceThis device shall be designed in such a way that it is not possible for the pressure regulator valve to be held in the openposition, for example, as a consequence of the spring being compressed fully (to its solid length).If the dimensi
39、ons of the pressure adjusting screw are such as to prevent the spring becoming fully compressed, then thepressure adjusting screw shall be not removable.Using the adjusting device, it shall not be possible to set a pressure at which the relief valve vents.6.2.6 Relief valve6.2.6.1 GeneralThe fitting
40、 of a relief valve is obligatory for all compressed gases and carbon dioxide and optional for LPG, MPS andacetylene.The minimum discharge QRVof the relief valve, if fitted, shall be equal to or greater than the standard discharge Q1(seetables 3 and 4) for a pressure pRVdefined by the expression pRV=
41、 2p2, except in the case of acetylene regulators, where pRVshall be equal to 3 bar for all classes.With decreasing pressure the relief valve shall close at a pressure greater than p2. The relief valve shall be non-adjustable bythe user.6.2.6.2 Relief valve for compressed gases and carbon dioxideThe
42、relief valve shall remain gas tight to a pressure above the maximum outlet pressure achieved when the flow is shut offfor the initial pressure p3. The relief valve shall be fitted in such a way that the gas discharges safely.6.2.6.3 Relief valve for acetyleneThe relief valve, if fitted, shall remain
43、 gas tight to a pressure above 1,5 bar. It shall be fitted in such a way that the gas is notdischarged towards to the operator.6.2.6.4 Relief valve for LPG and MPSThe relief valve, if fitted, shall conform to 6.2.6.2.SANS 2503:2007This s tandard may only be used and printed by approved subscription
44、and freemailing clients of the SABS .ISO 2503:1998(E)ISO66.2.7 Pressure gaugesWhen fitted externally, pressure gauges shall conform to ISO 5171. If pressure gauges are integral with the regulator, therelevant operational and safety requirements stipulated in ISO 5171 shall apply.6.2.8 Gas tightnessP
45、ressure regulators shall be gas tight to the atmosphere and shall conform to the requirements of ISO 9090.Pressure regulators shall be internally gas tight, i.e. between the high pressure and low pressure parts for all normalpressures for relevant gases. The maximal internal leakage shall not exceed
46、 0,2 mbar l/min (12 cm3/h).6.2.9 Mechanical resistance6.2.9.1 Fitness for servicePressure regulators shall be designed and constructed in such a way that the application of pressures given in table 6 in thehigh pressure and low pressure chambers does not lead to permanent deformation.6.2.9.2 SafetyP
47、ressure regulators shall be designed and constructed so that if the low pressure chamber of the regulator, or intermediatechamber in the case of two-stage regulators, is in direct communication with a full cylinder of gas, for instance if the regulatorvalve is held in the open position and the outle
48、t connection is closed (by an attached stop valve or a blind plug) the high-pressure gas shall either be safely retained or vented (see 11.5.1.2).7 Types of connections7.1 Inlet connectionsPressure regulators shall be made in such a way that the inlet connection is compatible with the cylinder valve
49、 outletdesigned for the gas contained (see ISO/TR 7470). The inlet pressure p1specified by the manufacturer, shall be not lessthan the maximum charging pressure (at 15 C) permitted for the cylinder connection.7.2 Outlet connectionsThreaded outlet connections shall conform to ISO 3253 and comply with the following conditions: the outlet connection orientation should preferably point downwards and away from the cylinder; curved hose tails shall not be used.8 Physical characteristicsThe symbols use
