EN ISO 5172:1996

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Handbrenner für Gasschweißen, Schneiden und Wärmen - Anforderungen und Prüfungen (ISO 5172:1995 einschliesslich Änderung 1:1995)Chalumaux manuels pour soudage aux gaz, coupage et chauffage - Spécifications et essais (ISO 5172:1995 inclus Amendement1:1995)Manual blowpipes for welding, cutting and heating - Specifications and tests (ISO 5172:1995, including Amendment 1:1995)25.160.30Varilna opremaWelding equipmentICS:Ta slovenski standard je istoveten z:EN ISO 5172:1996SIST EN ISO 5172:1999en01-december-1999SIST EN ISO 5172:1999SLOVENSKI
STANDARD



SIST EN ISO 5172:1999



SIST EN ISO 5172:1999



SIST EN ISO 5172:1999



SIST EN ISO 5172:1999



SIST EN ISO 5172:1999



INTERNATIONAL STANDARD ISO 5172 Second edition 1995-05-01 Manual blowpipes for welding, cutting and heating - Specifications and tests Chalumeaux manuek pour soudage aux gaz, coupage et chauffage - Spkifica tions et essais Reference number ISO 5172: 1995(E) SIST EN ISO 5172:1999



ISO 5172:1995(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. lnternational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 5172 was prepared by Technical Committee ISO/TC 44, WeIding and allied processes, Subcommittee SC 8, Gas weldhg equipmen t. This second edition cancels and replaces the first edition (ISO 5172:1977), which has been technically revised. Annex A of this International Standard is for information only. 0 ISO 1995 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanrcal, including microfilm, without permissi on in writing from the publisher. photocopying and International Organization for Standardization Case Postale 56 l CH-l 211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN ISO 5172:1999



INTERNATIONAL STANDARD 0 ISO ISO 5172:1995(E) IWlanual blowpipes for welding, cutting and heating - Specifications and tests 1 Scope This International Standard specifies the character- istics of manual blowpipes for gas welding, cutting and heating of metals and gives specifications and corresponding tests. ISO 5175:1987, Equipment used in gas welding, cut- ting and allied processes - Safety devices for fuel gases and Oxygen or compressed air - General specifications, requiremen ts and tests. ISO 9012:1988, Air-aspirated hand blowpipes - Specifica tions. This International Standard covers manual blowpipes for welding and heating up to 1 800 I/h to 2 500 I/h fuel gas and cutting blowpipes for cutting structural steel up to a thickness of 300 mm. ISO 9090:1989, Gas tightness of equipment for gas welding and allied processes. Air aspirated blowpipes are excluded from this Inter- national Standard (see ISO 9012). ISO 9539: 1988, Materials for equipment used in gas welding, cutting and allied processes. NOTE 1 In addition to terms used in two of the three of- 3 Definitions ficial ISO languages (English and French), this International Standard gives the equivalent terms in the German lan- guage; these are published under the responsibility of the member body for Germany (DIN). For the purposes of this International Standard, the following definitions apply. However, only the terms given in the official languages tan be considered as ISO terms. Terminology concerning gas welding, cutting and heating blowpipes is given in annex A. 3.1 Common types of mixing Systems 2 Normative references The following Standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, 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 re- cent editions of the Standards indicated below. Members of IEC and ISO maintain registers of cur- rently valid International Standards. ISO 554: 1976, Standard atmospheres for conditioning and/or tes ting - Specifica tions. ISO 3253:1975, Hose connections for equipment for 3.1.1 injector-mixer: Mixing System in which the fuel gas and the oxidizing gas are mixed by the action of the latter which, being discharged from the orifice of the injector, reduces the pressure, thus entraining the fuel gas. Accordingly, when the valve in the fuel gas channel is closed while the oxidizing gas is normally discharged, the pressure in this channel is below the atmospheric pressure. If, at the Same time, the fuel gas hose connecting nipple is exposed to the atmosphere, air will be entrained (fuel gas valve open) (see figure 1). 3.1.2 mixer without injector action: Mixing sys- tem in which the fuel gas and the oxidizing gas are mixed when the latter is discharged from the orifice and meets the fuel gas which is discharged at nearly identical pressure. When the valve in the fuel gas welding, cutting and rela ted processes. channel is closed while the oxidizing gas is dis- 1 SIST EN ISO 5172:1999



ISO 5172:1995(E) 0 ISO charged, the pressure in this channel is higher than the atmospheric pressure. If, at the Same time, the fuel gas hose connecting nipple is exposed to the at- mosphere, oxidizing gas will be discharged (fuel gas valve open) (see figure2). NOTE 2 Position of the mixing Systems: the mixing sys- tems according to 3.1.1 and 3.1.2 are usually in the shank; they may also be between the shank and nozzle or in the nozzle. 32 . Migh-pressure and low-pressure blowpipes 3.2.1 high-pressure blowpipe: A blowpipe in which the pressure of both the fuel gas and the oxidizing gas measured immediately before the Point of mixing is higher than the pressure of the gas mixture measured downstream between mixer and nozzle (see figure 2). 3.2.2 low-pressure blowpipe: A blowpipe in which the fuel gas pressure measured immediately before the Point of mixing is lower than the pressure of the gas mixture measured downstream between mixer and nozzle (see figure 1). Mixture p, 3.3 Blowpipes classified according to the possi- bility sf varying the flow rate 3.3.1 blowpipe with a Single flow rate: A blow- pipe which, due to design, gives a Single nominal gas flow rate which tan only be varied within narrow Iim- its. 3.3.2 blowpipe with multiple flow rates: A blow- pipe giving a range of flow rates corresponding to a series of nozzles. 3.3.2.1 blowpipe with multiple gas flow rates adjusted by means of the injector: A blowpipe with multiple gas flow rates which are varied by means of a device for adjustment of the injector Cross-section (blowpipe with variable injector). Pr = pressure of fuel gas po = pressure of Oxygen Pf %l - high pressure &n = pressure of mixture Fuel gas - Oxygen Pf c4Tl - low pressure po ‘hl Figure 1 - Injector-mixer (low and high pressure) Pf ixture Pf ‘&Tl po ’ hl=! Figure 2 - Mixer without iinjector action SIST EN ISO 5172:1999



0 ISO ISO 5172:1995(E) 3.3.2.2 blowpipe with multiple gas flow rates adjusted by the pressure: A blowpipe with multiple gas flow rates which are varied by adjusting the feed pressures (blowpipe with fixed mixer). 3.3.2.3 blowpipe with multiple gas flow rates adjusted by changing the injector: A blowpipe with multiple gas flow rates which are varied by changing the injector. The satter often forms a Single com- ponent with the outlet nozzle (blowpipe with inter- changeable nozzle). 3.3.2.4 blowpipe with multiple gas flow rates adjusted by means of gas control valves: A blow- pipe with multiple gas flow rates which are varied by means of the adjustment valves. 3.4 Cutting blowpipes mixing Position classified according to the shank or detachable. The external Profile of the nipples is left to the choice of manufacturer. Where a threaded Union connection is used it shall conform to ISO 3253. 5 Material The material requirements, according to ISO 9539, shall be fulfilled. Components in contact with Oxygen shall be free from Oil, grease and other contaminants. 6 Marking The marking shall be legible and durable. 6.1 Marking of the blowpipe 3.4.1 blowpipe with preliminary mixer: A blow- pipe in which the mixture of heating Oxygen and fuel gas is ensured by the injector-mixer located before the cutting nozzle. 3.4.2 blowpipe with nozzle mixing: A blowpipe in which the heating Oxygen and fuel gas ways are in- dependent in the blowpipe and the head. The gases are mixed in the cutting nozzle (nozzle mixing). 3.5 Backfire, sustained backfire, flashback, back- flow 3.5.1 backfire: The return of the flame into the blowpipe with a popping Sound, the flame being either extinguished or reignited at the nozzle. 3.5.2 sustained backfire: The return of the flame into the blowpipe with continued burning within the neck or mixer. (This may be accompanied by an initial popping Sound followed by a continuous hissing Sound caused by continued burning within the blow- pipe.1 3.5.3 flashback: The return of the flame through the blowpipe into the hoses and even the regulators. lt may also resch the acetylene cylinder, causing heat- ing and decomposition of the contents. 3.5.4 backflow: Flowing back of the gas at the higher pressure into the hose of the gas at the lower pressure. This tan be caused by the nozzle exit be- coming blocked or restricted. The blowpipe shank shall carry the name or registered trade mark of the manufacturer (the term “manufac- turer” includes distributors, suppliers or importers) and the reference number of this International Stan- dard. The marking should be according to 6.6 and 6.7. The connection adjacent to the Oxygen inlet of blowpipes with fixed hose connecting nipples shall be identified by the letter “0”. 6.2 Marking of Oxygen valves The heating Oxygen valves (body or knob) shall be identified by the letter “0” and/or the colour blue. The cutting Oxygen valve shall be identified designed. if similarly 6.3 Marking of nozzles All nozzles shall be marked with the name, registered trade mark or identifying mark of the manufacturer, the Symbol identifying the fuel gas and a code to al- low easy reference to the manufacturer’s operating data. 6.4 Marking of interchangeable components Where mismatching of interchangeable components (e.g. mixer and injector) could occur, an identifying Code, the manufacturer’s trade mark and the Symbol identifying the fuel gas shall be marked and shown in the operating data. 6.5 Marking of cutting attachment 4 Hose connections The nipples shall be either permanently fitted to the If it is separable, the cutting attachment shaii be marked with the name, the registered trade mark or 3 SIST EN ISO 5172:1999



ISO 5172:1995(E) 0 ISO the identifying mark of the manufacturer (the term “manufacturer” includes distributors, suppliers or importers). 6.6 Marking of mixers The user is advised to refer to the operating in- structions provided by the manufacturer (see clause 9). If operating pressures are marked on any part of the blowpipe they shall be indicated in bar. If the mixing device is symbolically marked, indicating the blowpipe type, the marking should conform to the Symbols shown in figures 3 to 5. Figure 3 - Fuel gas injector-mixer ll Figure 4 - Mixer without injector action Figure 5 - Fuel gas injector-mixer with backflow resistance according to 7.1.5 6.7 Gases to be used, Symbols for gases The following gases may be used. Where the full name of the gas cannot be imprinted the Symbols given in table 1 shall be used. Table 1 - Designations and Symbols for the gases Designations Oxygen Acetylene Propane, Butane or LPG (Liquefied Petroleum gas) Natura1 gas, Methane Hydrogen MPS (Methylacetylene-propadiene mix- tures) and other fuel gas mixtures Compressed air Symbols 0 A P M H Y D For blowpipes, nozzles and interchangeable com- ponents capable of use with more than one fuel gas the abbreviation F shall be used. Operating data shall give details on fuel gases for which these com- ponents are suitable. 7 Safety and operational requirements 7.1 Safety requirements 7.1.1 Gas tightness The blowpipe shall comply with the requirements of ISO 9090 when tested as to the methods specified in it. The test, according to ISO 9090, shall be carried out on new blowpipes and after the valve endurante test in 8.4, after the sustained backfire tests 8.2.3 or 8.2.4 and the overheating tests according to 8.2.1 or 8.2.2. 7.1.2 Strength requirements The blowpipes shall be robust and suitable for the purpose intended. They shall be able to resist maltreatment due to incorrect Operation and handling, for example backfire and shock. 7.1.3 Valve design Esch gas line shall be separately closed with a valve. Valve elements shall remain captive in all positions. 7.1.4 Blowpipes’ resistance to sustained backfire 7.1.4.1 Resistance to sustained backfire due to overheating The blowpipe shall or injector without not sustain a backfire in the mixer a warning period of 2 s from the SIST EN ISO 5172:1999



0 ISO ISO 5172:1995(E) beginning of successive backfires (machine-gunning) when tested in accordance with 8.2. 7.1.4.2 Resistance to sustained backfire due to occlusion The blowpipe and nozzle shall be resistant to sus- tained backfire when the nozzle outlet(s) is or are partially and totally closed. Test conditions are ac- cording to 8.2.3 for welding blowpipes and to 8.2.4 for cutting blowpipes. 8 Test conditions The accuracy of the measuring and test equipment used shall be stated in the test results. All tests are Standard and are not intended to be production tests. 8.1 Leak test The tests shall be carried out in accordance with ISO 9090. 8.2 Sustained backfire test 7.1.5 Protection against backflow If a non-return valve is incorporated in the blowpipe it shall conform to ISO 5175. For mixers with marking such as that shown in figure 5, backflow shall not occur at 0,5 to 2 times the nominal gas operating pressures (see 8.5 for test conditions). 7.2 Operational requirements 7.2.1 General The following operational requirements shall be ful- filled for neutral (normal for LPG) mixture when the gases are supplied to the blowpipe at the nominal pressures specified by the manufacturer. 7.2.2 Flow rate Flow rates according to the manufacturer’s operating data shall be fulfilled. lt shall be possible to obtain the stated nominal flow of Oxygen and fuel gas for all nozzles. 7.2.3 Adjustment of flame lt shall be possible to adjust the flame continuously from its reducing state to oxidizing state around the stated nominal flow for each nozzle size. 7.2.4 Turn-down ratio - Welding blowpipes lt shall be possible to obtain a stable neutral (normal for LPG) flame at flow rates which are 25 % below the stated nominal flow rates. 7.2.5 Stability in wind lt shall be possible to maintain the flame in a wind transverse to the axis of the emergent gas stream at the orifice. Test conditions are according to 8.3. The tests shall be carried out for each combination of nozzle/mixer and shank from the manufacturer’s product range. 8.2.1 Overheating test - Welding blowpipes The nozzle and blowpipe being tested shall be ad- justed to the nominal flow stated by the manufacturer and to neutral flame conditions. To generate a backfire, external heating shall be ap- plied to the mixing tube and the nozzle by reflected heat from the flame. This reflected heating shall be applied for a minimum period of 2 s after the first backfire. The test device defined by figure6 for a shall be used. Single flame If no sustained backfire occurs within 3 min the blowpipe/nozzle is acceptable. If sustained backfire occurs without backfire, or within 2 s of the first backfire, the blowpipe/nozzle is rejected. An initially rejected blowpipe/nozzle shall pass the test twice before being regarded as acceptable. (Cooling and cleaning between tests is permitted.) 8.2.2 Overheating test - Cutting blowpipes No sustained backfire shall occur in the mixing chamber and/or injector within a minimum period of 1 min and a warning period of 2 s from the beginning of successive backfires (i.e. machine-gunning). 8.2.2.1 Procedure Adjust nomina t he b lowpipe, f itted with its nozzle, to the feed pressure S stated by the manufacturer. Close the cutting Oxygen control valve or device. Adj ust the va Yves to P nomin roduce al gas flow rates bY actuating the a neutral (n ormal for LPG) flame. SIST EN ISO 5172:1999



ISO 5172:1995(E) Dimensions in millimetres Cooling water Water H = length of Primar-y flame inner cones X=H+5 NOTE - The test assembly is immersed in water to maintain its temperature under 100 “C. Figure 6 - Overheating test - Welding blowpipes - Single flame SIST EN ISO 5172:1999



0 ISO ISO 5172:1995(E) After an ignition time of approximately 1 min in at- mosphere, Position the nozzle inside a 90” angle of thick steel as shown in figure7. The maximum test duration shall be 3 min. During the tests it shall be possible to adjust the heating flame and maintain it neutral by actuating the fuel gas valve only. Dimensions in millimetres Cooling water Water H = length of primary flame inner cones (4, see figure 12) NOTE - The test assembly is immersed in water to keep its temperature under 100 “C. Figure 7 - Overheating test - Cutting blowpipes - Multi heating flame 7 SIST EN ISO 5172:1999



ISO 5172:1995(E) 8.2.2.2 Acceptance requirements The flow Chart for acceptance/rejection is shown in figure 8. Time 0 Initial positioning of nozzle - Neutrat flame Backfires and/or return of flame 1 min ? 4 l 9 No 1 1 Yes - Rejected i . . I Return of flame without preliminary backfire + . 1 Yes 1 , \ Rejected Return of flame (immediate) within less than 2 s of the first backfire l 4 1 Yes - Test to be repeated 4 4 (two new tests) b. . 3 min t Accepted Figure 8 - Acceptance requirements No backfire should occur in the first minute of the test. After the first minute b) if the return of flame occurs more than 2 s after the first backfire, the test shall be deemed acceptable; - return of flame without preliminary backfire is in- dicative of failure; c) if no backfire and sustained backfire occur within 3 min, the test shall be deemed ac- ceptable. - return of flame occurs after successive backfires, a) if the return of flame occurs less than 2 s after the first backfire, then the test shall have to be repeated; When the test has to be carried ou
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