1、BRITISH STANDARD BS EN 29090:1992 ISO 9090:1989 Specification for Gas tightness of equipment for gas welding and allied processes The European Standard EN 29090:1992 has the status of a British StandardBSEN29090:1992 This British Standard, having been prepared under the directionof the Welding Stand
2、ards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15 July 1992 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference WEE/18 Draft for comment 86/78437 DC ISBN 0 580 20681 5 Cooperating organizations The E
3、uropean Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad F
4、inland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano d
5、i Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland A
6、ssociation suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN29090:1992 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Defin
7、ition 3 4 Expression of leakage 3 5 Gas to be used for the tests 3 6 Test pressure 3 7 Maximum permissible leakage rates 3 8 Measurement of the leakage rate 4 Annex A (normative) Correction of measurements 6 Figure 1 Test apparatus 5 National annex NA (informative) Committees responsible Inside back
8、 cover National annex NB (informative) Cross-references Inside back coverBSEN29090:1992 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Welding Standards Policy Committee and is the English language version of EN29090:1992 “Gas tightness of equipme
9、nt for gas welding and allied processes”, published by the European Committee for Standardization (CEN). It supersedes BS7278:1990, which is withdrawn. EN29090 was produced as a result of international discussion in which the UK took an active part. A British Standard does not purport to include all
10、 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 a front cover, an inside front cover, pages i and
11、ii, the EN title page, pages 2 to 6, 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 29090
12、 May 1992 UDC 621.791.5.032:620.165.29 Descriptors: Welding, gas welding, welding equipment, specifications, gas permeability tests English version Gas tightness of equipment for gas welding and allied processes (ISO 9090:1989) Etanchit aux gaz des appareils pour soudage aux gaz et techniques connex
13、es (ISO 9090:1989) Gasdichtheit von Gerten fr Gasschweien und verwandte Verfahren (ISO 9090:1989) This European Standard was approved by CEN on 1992-05-22. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the s
14、tatus 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 European Standard exists in three official versions (English, French, German).
15、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 national standards bodies of Austria, Belgium, Denmark, Finland, France, German
16、y, 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 Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1992 Copyrig
17、ht reserved to CEN members Ref. No. EN 29090:1992 EEN29090:1992 BSI 08-1999 2 Foreword In September1991, CEN Technical Board decided to submit the International Standard ISO9090:1989 “Gas tightness of equipment for gas welding and allied processes” to the formal vote procedure. The result was positi
18、ve and the standard is now adopted as a European Standard. National standards identical to this European Standard shall be published at the latest by 1992-11-30 and conflicting national standards shall be withdrawn at the latest by 1992-11-30. According to the CEN/CENELEC Common Rules the following
19、countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. Endorsement notice The text of the International Standard ISO9090:19
20、89 was approved by CEN as a European Standard without any modification.EN29090:1992 BSI 08-1999 3 1 Scope This International Standard specifies the maximum external leakage rates which are acceptable for equipment used for welding, cutting and allied processes. It applies to individual components wh
21、ich are used in the gas supply to a blowpipe from the connecting point of the hose (outlet of the cylinder valve or connecting point to a gas supply plant). It does not apply to gas supply plants. 2 Normative references The following standards contain provisions which, through reference in this text
22、, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editi
23、ons of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 2503:1983, Pressure regulators for gas cylinders used in welding, cutting and allied processes. ISO 3821:1977, Welding Flexible hoses for gas welding and allied processes. 3 D
24、efinition For the purposes of this International Standard, the following definition applies. 3.1 external gas leakage undesired escape of gas to the atmosphere 4 Expression of leakage The maximum permissible external leakage rates which are specified in this International Standard are total leakage
25、rates for a complete component including inlet connections. These rates are given in cubic centimetres per hour 1)of the gas for which the equipment was designed, corrected to standard conditions 2) , measured at room temperature. NOTEConnections that are necessary only for the test are excluded. 5
26、Gas to be used for the tests Devices to be used with helium shall be tested with helium and devices to be used with hydrogen shall be tested with hydrogen or helium. Devices to be used with other gases shall be tested with dry oil-free air or nitrogen. If the test is carried out with a gas other tha
27、n the gas for which the equipment is designed, appropriate corrections shall be made (seeAnnex A). 6 Test pressure 6.1 Regulators Regulators shall be tested at pressures p 1and p 2as defined in ISO2503. 6.2 Other equipment 6.2.1 Type tests Other devices shall be tested at the following pressures: a)
28、 maximum working pressure as given by the manufacturer; b) 10% of the maximum working pressure. 6.2.2 Routine tests All devices shall be tested at that pressure (of the two pressures specified in 6.2.1) which gave the most unfavourable results during the type tests. 7 Maximum permissible leakage rat
29、es NOTEThe leakage rate for individual devices will be incorporated directly in the relevant standards for that device when they are revised. 7.1 Regulators Regulators shall not have a total leakage rate greater than 10cm 3 /h. 7.2 Blowpipes With the gas hose connected to one of the inlet connection
30、s, blowpipes shall be submitted to the following test: a) Close off the nozzle and the other inlet connection and half-open both the valves. Permissible leakage rate: 8cm 3 /h b) Close off the nozzle and open the second inlet connection; half-open valve2 and close valve1. Permissible leakage rate: 4
31、cm 3 /h 1) 1 cm 3 /h = 0,28 10 9m 3 /s 2) Standard conditions: 23 C/1,013 bar (0,101 3 MPa).EN29090:1992 4 BSI 08-1999 c) Close off the second inlet connection and open the nozzle; close valve2. Permissible leakage rate: 4cm 3 /h NOTEThis test procedure enables total leakage and leakage through each
32、 valve to be tested. 7.3 Safety devices Safety devices shall not have a total leakage rate greater than 8cm 3 /h. 7.4 Quick-action couplings Connected quick-action couplings shall not have a total leakage rate greater than 10cm 3 /h. 7.5 Devices with combined functions Devices with combined function
33、s shall have a total leakage rate not exceeding the maximum rate applicable to any individual function. 7.6 Other equipment Other equipment which may be used on an installation for gas welding and allied processes shall not have an overall leakage rate greater than8cm 3 /h. 7.7 Hoses Hoses shall con
34、form to the requirements laid down in ISO3821 in terms of the leakage rate and/or gas permeability. 8 Measurement of the leakage rate The method described below is used to determine the leakage rate of a device; it is a type test method which determines whether a device conforms to the requirements
35、specified in clause7. For routine purposes, manufacturers may use whatever method is most suited to their requirements. 8.1 Principle of the test method Immersion of the device to be tested in water, with the device connected to a gas source throughout the test; collection of the gas leaking from th
36、e device in a graduated cylinder initially full of water. Other test methods are permitted, provided that it can be shown that these give results as accurate as those available from the method given in this clause. 8.2 Test apparatus (see the figure) 8.2.1 Water-bath, having suitable dimensions for
37、complete immersion of the device to be tested. 8.2.2 Gas supply, allowing pressurization of the device throughout the test. 8.2.3 Graduated cylinder, initially full of water, mounted above the device to be tested. The size and scale graduations of the graduated cylinder shall be such that the volume
38、 can be read to an accuracy of0,5cm 3 . 8.2.4 Funnel, allowing the escaping gas to be collected. The funnel shall be suitable to collect all the gas which may escape from the device, but not that which escapes from the connection with the gas supply pipe. 8.3 Procedure 8.3.1 Connect the device to be
39、 tested to the gas supply(8.2.2), all other possible openings being closed so that the leakage rate may be determined. 8.3.2 Immerse the device in the water-bath(8.2.1) to a depth of at least 20cm and supply the device with gas at a pressure equal to the test pressure, as given in clause6, plus the
40、pressure %p due to the immersion depth. 8.3.3 Wait 10min to allow the trapped air adhering to the outside surfaces of the device to escape, then place the graduated cylinder (8.2.3) and the funnel(8.2.4) in position and maintain the device under pressure for 1h. 8.3.4 At the end of the test, raise o
41、r lower the graduated cylinder so as to equalize the levels of the water in the tube and in the bath; measure the volume of collected gas by reading the graduation on the tube. 8.3.5 Correct the measured volume, as specified in clauses 4 and5, to take into account the gas and the standard temperatur
42、e and pressure conditions.EN29090:1992 BSI 08-1999 5 Figure 1 Test apparatusEN29090:1992 6 BSI 08-1999 Annex A (normative) Correction of measurements If the tests are not carried out with the gas for which the device is designed, the measured leakage rate shall be multiplied by the appropriate corre
43、ction factor given in the table. Gas used for the tests Correction factor for the leakage rate measured Air Oxygen Nitrogen Argon Hydrogen Helium Acetylene Air 1 0,950 1,02 0,852 1,05 Nitrogen 0,983 0,930 1 0,837 1,03 Hydrogen 1 Helium 1,431 1 BSEN29090:1992 BSI 08-1999 National annex NA (informativ
44、e) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Welding Standards Policy Committee (WEE/-) to Technical Committee WEE/18, upon which the following bodies were represented. British Compressed Gases Association British Railwa
45、ys Board Consumer Policy Committee of BSI Department of Trade and Industry (Consumer Safety Unit, CA Division) Federation of Civil Engineering Contractors Health and Safety Executive Liquefied Petroleum Gas Industry Technical Association (UK) Railway Industry Association of Great Britain Welding Man
46、ufacturers Association (BEAMA Ltd.) Coopted members National annex NB (informative) Cross-references There are no corresponding British Standards for the publications referred to in this standard 3) 3) Where no corresponding British Standard exists, the user is directed to the relevant European or I
47、nternational Standard, copies of which may be obtained from BSI Sales, Linford Wood, Milton Keynes MK14 6LE, telephone 0908 220022, telex 825777 BSIMK G or facsimile 0908 322484 (all other fax enquiries should be sent to 0908 320856).BS EN 29090:1992 ISO 9090:1989 BSI 389 Chiswick High Road London W
48、4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. U
49、sers of BritishStandards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that s
