EN 29090-1992 en Gas Tightness of Equipment for Gas Welding and Allied Processes《气焊以及类似的处理过程中设备的气密特性(ISO 9090-89)》.pdf
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1、CEN EN*29090 92 3404589 0028958 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 29090 May 1992 UDC 621.791.5.032:620,165.29 Descriptois: Welding, gas welding, welding equipment, specifications, gas permeability tests English version Gas tightness of equipment for gas welding and allied proces
2、ses (IS0 9090: 1989) Etanchit aux gaz des appareils pour soudage aux gaz et techniques connexes (IS0 9090: 1989) Gasdichtheit von Gerten fr GasschweiBen und verwandte Verfahren (IS0 9090: 1989) This European Standard was approved by CEN on 1992-05-22. GEN membeis are bound to comply with the CENICEN
3、ELEC Internal Regulations 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
4、CEN member. This European Standard exists in three official versions (English, French, Geiman). 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
5、 members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Geimany, Greece, IceIand, Ireland, Italy, Luxembourg, Netherlands, Norway, Poitugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Euro
6、pisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1992 Copyiight reserved to CEN members Ref. No. EN 29090 : 1992 E CEN EN*29090 92 W 3404589 0028959 4 .Page 2 EN 29090 : 1992 Foreword In September 1991, CEN %chnical Board decided to submit the International Stand
7、ard IS0 9090 : 1989 Gas tightness of equipment for gas welding and allied processes to the formal vote procedure. The result was positive 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
8、conflicting national standards shall be withdrawn at the latest by 1992-11-30. According to the CENKENELEC Common Rules the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands
9、, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Standard IS0 9090: 1989 was approved by CEN as a European Standard without any modification. Page 3 EN 29090 : 1992 Gas tightness of equipment for gas welding and allied processes 1 Sc
10、ope 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 which are used in the gas supply to a blowpipe from the connecting point of the hose (outlet of the cyli
11、nder valve or connecting point to a gas supply piant). It does not apply to gas supply plants. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indic
12、ated 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 editions of the standards listed below. Members of IEC and IS0 maintain regkters of currently valid Interna
13、tional Standards. IS0 2503 : 1983, Fressure regulators for gas cylinders used in welding, cutting and allied processes. IS0 3821 : 1977, Welding - Flexible hoses for gas welding and allied processes. 3 Definition For the purposes of this International Standard, the following definition applies. exte
14、rnal 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 rates for a complete component including inlet connections. These rates are given in cubic centimet
15、res per hour) of the gas for which the equipment was designed, corrected to standard conditions21, measured at room temperature. NOTE - Connections that are necessary only for the test are excluded. 5 Gas to be used for the tests Devices to be used with helium shall be tested with helium and devices
16、 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 than the gas for which the equipment is designed, appropriate corrections shall be made (see annnex A
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