1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 9012:2011Gas welding equipment Air-aspirated hand blowpipes Specifications and tests (ISO9012:2008)BS EN ISO 9012:2011 BRITISH STANDARDNational forewordThis British Sta
2、ndard is the UK implementation of EN ISO 9012:2011.It is identical to ISO 9012:2008. It supersedes BS EN 731:1996 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee WEE/18, Gas welding and cutting appliances.A list of organizations represented on this commi
3、ttee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 74055 8ICS 25.160.30Compliance with a British Standard cannot confer immunity fromlegal obl
4、igations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 October 2011.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 9012 October 2011 ICS 25.160.30 Supersedes EN 731:1995Englis
5、h Version Gas welding equipment - Air-aspirated hand blowpipes - Specifications and tests (ISO 9012:2008) quipement de soudage aux gaz - Chalumeaux manuels aro-gaz air aspir - Spcifications et essais (ISO 9012:2008) Gasschweigerte - Handbrenner fr angesaugte Luft - Anforderungen und Prfungen (ISO 90
6、12:2008) This European Standard was approved by CEN on 18 September 2011. CEN members are bound to comply with the CEN/CENELEC 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 bibliogr
7、aphical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibi
8、lity of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
9、 Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management
10、Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 9012:2011: EBS EN ISO 9012:2011EN ISO 9012:2011 (E) 3 Foreword The text of ISO 9012:2008 has been prepared by Technical Committee IS
11、O/TC 44 “Welding and allied processes” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 9012:2011 by Technical Committee CEN/TC 121 “Welding” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard,
12、 either by publication of an identical text or by endorsement, at the latest by April 2012, and conflicting national standards shall be withdrawn at the latest by April 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and
13、/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 731:1995. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Be
14、lgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorse
15、ment notice The text of ISO 9012:2008 has been approved by CEN as a EN ISO 9012:2011 without any modification. BS EN ISO 9012:2011ISO 9012:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Main types of aspiration. 2
16、 5 Description of components . 5 5.1 Shank or handle 5 5.2 Attachment 5 5.3 Self-closing on/off valve control . 6 5.4 Device to prevent inadvertent operation 6 6 Requirements 6 6.1 General. 6 6.2 Materials 6 6.3 Valves. 6 6.4 Shank . 6 6.5 Hose connection. 7 6.6 Gas tightness 7 6.7 Gas-flow rate . 7
17、 6.8 Safety against sustained backfiring and blowing-off of the flame 7 6.9 Flame adjustment . 7 6.10 Stability in air currents. 7 6.11 Ignition . 8 7 Tests. 8 7.1 General. 8 7.2 General checks . 8 7.3 Operational tests. 8 7.4 Shank-overheating tests 8 7.5 Gas tightness 8 7.6 Valve endurance test 9
18、7.7 Checking gas-flow rates 9 7.8 Safety against sustained backfire and blowing-off of the flame . 9 7.9 Stability in air currents. 9 7.10 Verification of the device against inadvertent operation 9 8 Marking 9 8.1 General. 9 8.2 Marking of the shank 10 8.3 Marking of the attachment . 10 9 Code lette
19、rs identifying the gas(es) used 10 10 Instructions for use 10 Bibliography . 12 BS EN ISO 9012:2011ISO 9012:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
20、 preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental
21、, 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main
22、task of technical committees is to prepare International Standards. 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. Atten
23、tion is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 9012 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 8, E
24、quipment for gas welding, cutting and allied processes. This third edition cancels and replaces the second edition (ISO 9012:1998), which has been technically revised. Requests for official interpretations of any aspect of this International Standard should be directed to the Secretariat of ISO/TC 4
25、4/SC 8 via your national standards body. A complete listing of these bodies can be found at www.iso.org. BS EN ISO 9012:2011INTERNATIONAL STANDARD ISO 9012:2008(E) ISO 2008 All rights reserved 1Gas welding equipment Air-aspirated hand blowpipes Specifications and tests 1 Scope This International Sta
26、ndard specifies requirements and test methods for air-aspirated hand blowpipes. This International Standard applies to blowpipes for brazing, soldering, heating, fusion and other allied thermal processes, which use a fuel gas and aspirated air (injector-type blowpipes), and are intended for manual u
27、se. This International Standard is applicable to: air-aspirated hand blowpipes which are fed with a fuel gas in the gaseous phase, at a controlled pressure by a regulator, through a gas supply hose; air-aspirated hand blowpipes which are fed with a liquefied fuel gas in the gaseous phase at the cont
28、ainer pressure, through a gas supply hose; so-called liquid-phase blowpipes which are fed with a fuel gas in the liquid phase, and where thermal evaporation takes place within the blowpipe. It does not apply to blowpipes in which the fuel gas leaves the injector in the liquid phase, or to so-called
29、“cartridge” blowpipes where the gas supply is fixed directly onto the blowpipe and possibly constitutes the shank. NOTE Figures 1 to 4 of this International Standard are given for guidance only, to facilitate the explanation of the terms. They do not specify the construction details which are left t
30、o the discretion of the manufacturer. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendment
31、s) applies. ISO 554, Standard atmospheres for conditioning and/or testing Specifications ISO 9090, Gas tightness of equipment for gas welding and allied processes ISO 9539, Materials for equipment used in gas welding, cutting and allied processes 3 Terms and definitions For the purposes of this docu
32、ment, the following terms and definitions apply. 3.1 air-aspirated blowpipe blowpipe in which the fuel gas leaves the injector in the gaseous phase, being subsequently mixed in the mixing zone with a sufficient quantity of air, aspirated from the ambient atmosphere, to produce a technically usable f
33、lame BS EN ISO 9012:2011ISO 9012:2008(E) 2 ISO 2008 All rights reservedSee Figure 1. NOTE See Table 1 for the key to Figure 1. Figure 1 Schematic drawing of the mixing zone 3.2 sustained backfire penetration of the flame into the blowpipe, with continued burning upstream of the part intended for thi
34、s purpose, i.e. within: the blowpipe nozzle, behind the grid or flame-supporting devices; the tube; the blowpipe shank. 3.3 blowing-off of the flame detachment of the flame from the blowpipe nozzle, possibly causing the flame to be extinguished 4 Main types of aspiration Depending on the location of
35、 the mixing zone, a distinction is made between blowpipes with air aspiration in the: a) attachment (see Figure 2); b) nozzle (see Figure 3); c) shank (see Figure 4). BS EN ISO 9012:2011ISO 9012:2008(E) ISO 2008 All rights reserved 3NOTE See Table 1 for the key to Figure 2. Figure 2 Examples of blow
36、pipes with air aspiration in the attachment NOTE See Table 1 for the key to Figure 3. Figure 3 Examples of blowpipes with air aspiration in the nozzle BS EN ISO 9012:2011ISO 9012:2008(E) 4 ISO 2008 All rights reservedNOTE See Table 1 for the key to Figure 4. Figure 4 Examples of blowpipes with air a
37、spiration in the shank Table 1 Labels for Figures 1 to 4 Assemblies Items A hose 1 handle B shank 2 valve C attachment with air aspiration 3 hose connection D soldering attachment with air aspiration with a copper bit 4 head connection E bent tube 5 injector F straight tube 6 air inlet G blowpipe no
38、zzle with air aspiration 7 tube (may include air inlet) H liquid-phase nozzle with air aspiration 8 blowpipe nozzle I injector-type shank 9 soldering bit J attachment for bit soldering 10 bit support K attachment (without injector) 11 connection 12 adjustment of air inlet 13 control of automatic fla
39、me-reducing device 14 vaporization for system liquid-phase blowpipe 15 ignition system 16 on/off valve control BS EN ISO 9012:2011ISO 9012:2008(E) ISO 2008 All rights reserved 55 Description of components 5.1 Shank or handle (see Figures 2 and 3, assembly B, and Figure 4, assembly I) 5.1.1 General T
40、he shank is used for holding the attachment. It includes the system for fitting the hose and the gas control device(s). It may also include the injector (see Figure 4, assembly I). 5.1.2 Valve shank (see Figures 2 and 3, assembly B, and Figure 4, assembly I) This type of shank is fitted with a singl
41、e valve (item 2) for opening, shutting and regulating the gas-flow rate. 5.1.3 Shank with automatic flame-reducing device (see Figures 2 and 3, assembly B) This type of shank is fitted with two separate control devices: a valve (item 2) which controls the gas-flow rate under normal working condition
42、s, e.g. a knob; an automatic flame-reducing device (item 13) operated by a simple release mechanism, e.g. a trigger. 5.1.4 Shank with pressure-control or pressure-reducing device This type of shank is fitted with a device for the control or reduction of gas pressure. 5.1.5 Shank with ignition system
43、 This shank is fitted with a valve or an on/off valve control for the gas and with an ignition system acting simultaneously or separately. 5.2 Attachment 5.2.1 General The attachment is generally composed of a nozzle or burner and a tube. 5.2.2 Nozzle or burner (see Figures 2, 3 and 4, assemblies G,
44、 H and item 8) The shape of the nozzle depends on the work to be performed, for example: brazing or soldering; heating; paint removal; drying; bit soldering. The nozzle may include the injector (see Figure 3, item 5) as well as the supports and automatic lighting devices of the blowpipe. In liquid-p
45、hase blowpipes, the nozzle also incorporates the vaporization device (see Figure 3, item 14). NOTE Figures 2, 3 and 4 show only limited examples of blowpipes nozzles. The nozzles come in a great variety of shapes, particularly in the case of multiflame blowpipes for circumferential heating, etc. BS
46、EN ISO 9012:2011ISO 9012:2008(E) 6 ISO 2008 All rights reserved5.2.3 Tube The tube (item 7) connects the blowpipe nozzle to the shank. It may be of various lengths and shapes depending on the application for which it is designed. It may incorporate the injector (see Figure 2, item 5). Not all blowpi
47、pes have a tube. The tube may be permanently fitted to the blowpipe nozzle (see Figure 2, assemblies C and D, and Figure 4, assemblies J and K) or may act as a connecting tube between the nozzle and the shank (see Figure 3, assemblies E and F). 5.3 Self-closing on/off valve control This valve contro
48、l stops the gas flow as soon as manual grip is released. 5.4 Device to prevent inadvertent operation Device to prevent inadvertent gas flow or ignition. 6 Requirements 6.1 General The type of blowpipe shall correspond to the intended use and to the nature of the gas. For the design details not impos
49、ed by this International Standard, the manufacturer shall give primary consideration to the safety requirements. 6.2 Materials Materials used for the construction of these blowpipes shall conform to the requirements of ISO 9539. 6.3 Valves It shall not be possible to bypass closed on/off valve(s). Valves and valve elements shall remain fixed in position when valves are operated or fully open. Furthermore, it shall not be possible to disassemble any of the various external valve elements without th
