SIST EN 13918:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Oprema za plamensko varjenje - Regulatorji tlaka z vgrajenim
merilnikom pretoka na plinskih jeklenkah za varjenje, rezanje in sorodne postopke - Razvrstitev, specifikacija in preskusiGasschweißgeräte - Druckregler mit integriertem Durchflussmesser für Gasflaschen für Schweißen, Schneiden und verwandte Prozesse - Einteilung, Festlegung und PrüfungenMatériel de soudage aux gaz - Détendeurs débitmetres intégrés utilisés sur les bouteilles pour le soudage, le coupage et les techniques connexes - Classification, spécification et essaisGas welding equipment - Integrated flowmeter regulators used on cylinders for welding, cutting and allied processes - Classification, specification and tests25.160.30Varilna opremaWelding equipment23.060.40Pressure regulators23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 13918:2003SIST EN 13918:2003en01-december-2003SIST EN 13918:2003SLOVENSKI
STANDARD



SIST EN 13918:2003



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13918April 2003ICS 23.060.40English versionGas welding equipment - Integrated flowmeter regulators usedon cylinders for welding, cutting and allied processes -Classification, specification and testsMatériel de soudage aux gaz - Détendeurs débitmètresintégrés utilisés sur les bouteilles pour le soudage, lecoupage et les techniques connexes - Classification,spécification et essaisGasschweißgeräte - Druckregler mit integriertemDurchflussmesser für Gasflaschen für Schweißen,Schneiden und verwandte Prozesse - Einteilung,Festlegung und PrüfungenThis European Standard was approved by CEN on 13 February 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the 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 Management Centre or to any CEN member.This European Standard exists in three 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13918:2003 ESIST EN 13918:2003



EN 13918:2003 (E)2ContentspageForeword.3Introduction.31Scope.32Normative references.33Terms and definitions.44Units.54.1Pressures.54.2Flows.54.3Temperatures.55Manufacturing requirements.55.1Materials.55.2Design.56Type test procedure.76.1General.76.2Test conditions.76.3Leakage tests.86.4Stability test.86.5Accuracy tests and classification.86.6Mechanical resistance tests.96.7Relief valve test.96.8Ignition test for integrated flowmeter regulators for oxygen.97Marking.108Instructions for use.10Annex A (informative)
Operating principles of integrated flowmeter regulators.11Annex B (informative)
Flow measurement — Test apparatus.12Bibliography.13SIST EN 13918:2003



EN 13918:2003 (E)3ForewordThis document (EN 13918:2003) has been prepared by Technical Committee CEN/TC 121 "Welding", thesecretariat of which is held by DS.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latestby October 2003.Annexes A and B are informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.IntroductionEN ISO 2503 deals with pressure regulators for gas cylinders for welding cutting and allied processes. Thesepressure regulators deliver an as constant as possible downstream pressure from a generally variable gas cylinderpressure and the adjusting device acts to increase or reduce the regulated downstream pressure. Gas flow is notcontrolled by the pressure regulator.For some processes, e.g. arc welding with shielding gases, it is also necessary to control the gas flow. To achievethis, a pressure regulator coupled with a flowmeter is used. In this case the integrated flowmeter regulator adjustingdevice acts to increase or decrease the downstream flow. Annex A indicates the operating principles of integratedflowmeter regulators.1 ScopeThis European Standard specifies the requirements and type test methods of integrated flowmeter regulators forwelding, cutting and allied processes.It is applicable to integrated flowmeter regulators which may be equipped with flow control and measuring devicesof gas flows on gas cylinders normally used for compressed gases up to 300 bar1) (30 MPa) and carbon dioxide(CO2).2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).
1) 300 bar relates to max. gas cylinder charging pressure at 15 °C.SIST EN 13918:2003



EN 13918:2003 (E)4EN 560, Gas welding equipment — Hose connections for equipment for welding, cutting and allied processes.EN 562, Gas welding equipment — Pressure gauges used in welding, cutting and allied processes.EN 720-2, Transportable gas cylinders — Gases and gas mixtures — Part 2: Determination of flammability andoxidizing ability of gases and gas mixtures.EN 13622:2002, Gas welding equipment - Terminology - Terms used for gas welding equipment.EN 29539, Materials for equipment used in gas welding, cutting and allied processes (ISO 9539:1988).EN ISO 2503:1998, Gas welding equipment — Pressure regulators for gas cylinders used in welding, cutting andallied processes up to 300 bar (ISO 2503:1998).3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1integrated flowmeter regulatordevice for regulating a generally variable inlet gas pressure to an as constant as possible outlet pressure, ensuringin addition a controlled gas flow. It is generally a pressure regulator equipped with flow adjusting and measuringdevices which are not intended to be separated from the regulating device by the operator (see annex A)3.2pressures3.2.1nominal inlet pressure p1see EN 13622:2002, 2.2.13.2.2maximum intermediate pressure p2mmaximum intermediate pressure (i.e. as measured in the intermediate pressure chamber, downstream of thepressure regulator valve and upstream of the flow adjusting and measuring device) defined by the manufacturer3.2.3upstream pressure for type testing p3p3 = 2 p2m + 1 bar (0,1 MPa)3.3nominal flow Qnflow defined by the manufacturer and measured at the outlet of the integrated flowmeter regulator (downstream ofthe flow adjusting and measuring devices)3.4indicated flow(s)flow(s) indicated on the measuring device of the integrated flowmeter regulator3.5true flowtrue value of the flow as measured with a calibrated measuring device3.6accuracydifference between the indicated flow and the true flow, as a percent of the indicated flowSIST EN 13918:2003



EN 13918:2003 (E)54 Units4.1 PressuresThe pressures are gauge pressures2) expressed in bar (0,1 MPa).4.2 FlowsThe flows are expressed in litres per minute relative to standard conditions3).4.3 TemperaturesThe temperatures are expressed in degrees Celsius.5 Manufacturing requirements5.1 MaterialsMaterials for integrated flowmeter regulators shall conform to the requirements of EN 29539.5.2 Design5.2.1 Integrated flowmeter regulator for oxygenIntegrated flowmeter regulators for oxygen or gas mixtures more oxydizing than air (in accordance with EN 720-2)shall be designed, machined and manufactured such that internal ignition does not occur (see 6.8). All componentsand accessories shall be thoroughly cleaned and degreased before assembly.5.2.2 FilterThe filter shall meet the requirements in accordance with EN ISO 2503:1998, 6.2.3.5.2.3 Flow adjusting deviceIntegrated flowmeter regulators may be fitted with a flow adjusting device. When fitted, the adjusting knob shall becaptive and the adjusting device shall meet the relevant r
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