1、BS EN ISO3821:2010ICS 25.160.30; 83.140.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDGas welding equipment Rubber hoses forwelding, cutting andallied processes (ISO3821:2008)This British Standardwas published under theauthority of the StandardsPolicy and St
2、rategyCommittee on 30 April2010 BSI 2010ISBN 978 0 580 68917 8Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 3821:2010National forewordThis British Standard is the UK implementation of EN ISO 3821:2010.It is identical to ISO 3821:2008. It supersedes BS EN 559:2003 which iswithd
3、rawn.The UK participation in its preparation was entrusted to TechnicalCommittee WEE/18, Gas welding and cutting appliances.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a c
4、ontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3821 March 2010 ICS 83.140.40; 25.160.30 Supersedes EN 559:2003English Version Gas welding equipment - R
5、ubber hoses for welding, cutting and allied processes (ISO 3821:2008) Matriel de soudage aux gaz - Tuyaux souples en caoutchouc pour le soudage, le coupage et les techniques connexes (ISO 3821:2008) Gasschweigerte - Gummischluche fr Schweien, Schneiden und verwandte Prozesse (ISO 3821:2008) This Eur
6、opean Standard was approved by CEN on 21 February 2010. 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 bibliographical references
7、 concerning such national standards may be obtained on application to the CEN 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 responsibility of a CEN member into
8、its own language and notified to the CEN 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, Hungary, Iceland, Ireland, Italy,
9、 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 Centre: Avenue Marnix 17, B-1000 B
10、russels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3821:2010: EBS EN ISO 3821:2010EN ISO 3821:2010 (E) 3 Foreword The text of ISO 3821:2008 has been prepared by Technical Committee ISO/TC 44 “Welding and allied proces
11、ses” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 3821:2010 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, either by publication of an ident
12、ical text or by endorsement, at the latest by September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be h
13、eld responsible for identifying any or all such patent rights. This document supersedes EN 559:2003. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
14、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. Endorsement notice The text of IS
15、O 3821:2008 has been approved by CEN as a EN ISO 3821:2010 without any modification. BS EN ISO 3821:2010ISO 3821:2008(E) ISO 2008 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Abbreviated terms .2 5 Application .2 6 Hose designation.2
16、7 Materials .3 7.1 Construction 3 7.2 Manufacture .3 8 Dimensions and tolerances3 8.1 Internal diameter3 8.2 Concentricity (total indicator reading) 4 8.3 Cut lengths and tolerances 4 9 Requirements and type tests .4 9.1 General .4 9.2 Basic requirements .4 9.3 Special requirements 6 10 Hose colour
17、and gas identification8 10.1 General .8 10.2 Gas identification 8 10.3 Marking.8 Annex A (normative) Method of test for non-ignition .9 Annex B (normative) Method of test for resistance to n-pentane11 Annex C (normative) Method of test for resistance to incandescent particles and hot surfaces12 Anne
18、x D (normative) Summary of requirements and type tests14 Annex E (normative) Alternative oxygen gas colour codes.15 Bibliography16 BS EN ISO 3821:2010ISO 3821:2008(E) iv ISO 2008 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of nationa
19、l standards bodies (ISO member bodies). The work of 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. Internation
20、al 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. International Standards are drafted in accordance with the rules
21、 given in the ISO/IEC Directives, Part 2. The main 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 le
22、ast 75 % of the member bodies casting a vote. Attention 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 3821 was prepared by Technical Committee ISO/TC 44,
23、 Welding and allied processes, Subcommittee SC 8, Equipment for gas welding, cutting and allied processes. This fourth edition cancels and replaces the third edition (ISO 3821:1998), which has been technically and editorially revised. Requests for official interpretations of any aspect of this Inter
24、national Standard should be directed to the Secretariat of ISO/TC 44/SC 8 via your national standards body. A complete listing of these bodies can be found at www.iso.org. BS EN ISO 3821:2010INTERNATIONAL STANDARD ISO 3821:2008(E) ISO 2008 All rights reserved 1Gas welding equipment Rubber hoses for
25、welding, cutting and allied processes 1 Scope This International Standard specifies requirements for rubber hoses (including twin hoses) for welding, cutting and allied processes. This International Standard specifies requirements for rubber hoses for normal duty of 2 MPa (20 bar) and light duty lim
26、ited to hoses for maximum working pressure of 1 MPa (10 bar) and with bore up to and including 6,3 mm. This International Standard applies to hoses operated at temperatures 20 C to +60 C and used in: gas welding and cutting; arc welding under the protection of an inert or active gas; processes allie
27、d to welding and cutting, in particular, heating, brazing, and metallization. This International Standard applies neither to thermoplastics hoses nor to hoses used for high pressure 0,15 MPa (1,5 bar) acetylene. 2 Normative references The following referenced documents are indispensable for the appl
28、ication of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 37, Rubber, vulcanized or thermoplastic Determination of tensile stress-strain properties ISO 188, Rubber, vul
29、canized or thermoplastic Accelerated ageing and heat resistance tests ISO 1307:2006, Rubber and plastics hoses Hose sizes, minimum and maximum inside diameters, and tolerances on cut-to-length hoses ISO 1402, Rubber and plastics hoses and hose assemblies Hydrostatic testing ISO 1746, Rubber or plast
30、ics hoses and tubing Bending tests ISO 1817, Rubber, vulcanized Determination of the effect of liquids ISO 4080, Rubber and plastics hoses and hose assemblies Determination of permeability to gas ISO 4671, Rubber and plastics hoses and hose assemblies Methods of measurement of the dimensions of hose
31、s and the lengths of hose assemblies ISO 4672:1997, Rubber and plastics hoses Sub-ambient temperature flexibility tests ISO 7326:2006, Rubber and plastics hoses Assessment of ozone resistance under static conditions BS EN ISO 3821:2010ISO 3821:2008(E) 2 ISO 2008 All rights reservedISO 8033:2006, Rub
32、ber and plastics hoses Determination of adhesion between components ISO 8330, Rubber and plastics hoses and hose assemblies Vocabulary ISO 11114-3, Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents Part 3: Autogenous ignition test in oxygen atmosphere ISO 23
33、529, Rubber General procedures for preparing and conditioning test pieces for physical test methods 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8330 and the following apply. 3.1 twin hose two normal rubber hoses joined together longitudinally 3.2
34、 universal fuel gas hose hoses which can be used for all fuel gases except fluxed fuel gas NOTE Fuel gases are listed in Table 4. 3.3 flux fuel gas hose hose suitable for fuel gas containing a flux 4 Abbreviated terms For the purposes of this document, the following abbreviations apply. LPG liquefie
35、d petroleum gases MPS methylacetylene-propadiene mixtures 5 Application Hoses shall only be used for the gas service for which they are identified (see 10.2). 6 Hose designation The hoses covered by this International Standard are designated using the following information: a) nominal bore, see Tabl
36、e 1; b) light or normal duty (pressure rating), see Table 3; c) colour and marking (gas service), see Table 4. EXAMPLE 1 6,3 mm, light duty. EXAMPLE 2 10 mm, normal duty. EXAMPLE 3 6,3 mm, light duty, FLUX. BS EN ISO 3821:2010ISO 3821:2008(E) ISO 2008 All rights reserved 37 Materials 7.1 Constructio
37、n 7.1.1 General The hose shall consist of: a) a rubber lining of minimum thickness 1,5 mm; b) reinforcement applied by any suitable technique; c) a rubber cover of a minimum thickness of 1,0 mm. 7.1.2 Flux fuel gas hose The flux fuel gas hose shall consist of: a) a rubber lining with an additional i
38、nner plastic layer, which shall be of maximum thickness 0,5 mm, to give a minimum total thickness of 1,5 mm; b) reinforcement applied by any suitable technique; c) a rubber cover of minimum thickness 1,0 mm. 7.1.3 Twin hose Each hose used for twin hose construction shall be as specified in 7.1.1 or
39、7.1.2. The two hoses shall be joined longitudinally during the extrusion and/or vulcanization process. They shall be capable of being separated free of damage to enable end fittings to be fitted. See 9.3.7. 7.2 Manufacture The lining and cover shall be of uniform thickness and free from holes, poros
40、ity and other defects. 8 Dimensions and tolerances 8.1 Internal diameter The internal diameter of the hoses shall be in accordance with the dimensions and tolerances shown in Table 1. BS EN ISO 3821:2010ISO 3821:2008(E) 4 ISO 2008 All rights reservedTable 1 Nominal bore, internal diameter, tolerance
41、s and concentricity Nominal bore Internal diameter mm Tolerance mm Concentricity max. mm 4 4 4,8 4,8 5 5 6,3 6,3 7,1 7,1 0,40 8 8 9,5 9,5 10 10 0,50 12,5 12,5 16 16 1 20 20 25 25 0,60 32 32 1,0 1,25 40 40 50 50 1,25 1,50 NOTE 1 The tolerances and internal diameters (excluding nominal bore of 20 mm)
42、do not comply with ISO 1307:2006, Table 1. NOTE 2 For intermediate dimensions, numbers should be chosen from the R20 series of preferred numbers (see ISO 3) with tolerances as for the next larger internal diameter listed. 8.2 Concentricity (total indicator reading) The concentricity of the hose, mea
43、sured in accordance with ISO 4671, shall be in accordance with the values given in Table 1. 8.3 Cut lengths and tolerances The tolerances for cut lengths shall be in accordance with ISO 1307. 9 Requirements and type tests 9.1 General A summary of requirements and type tests with the corresponding nu
44、mber of samples is given in Annex D. 9.2 Basic requirements 9.2.1 Tensile strength and elongation at break Measurements shall be made on test specimens cut from the hoses. The materials used in the lining and cover, when tested in accordance with ISO 37, shall have a tensile strength and elongation
45、at break not less than the values given in Table 2. BS EN ISO 3821:2010ISO 3821:2008(E) ISO 2008 All rights reserved 5Table 2 Tensile strength and elongation at break Rating Tensile strength MPa Elongation at break % Rubber lining 5 200 Cover 7 250 Inner plastic layer 5 120 9.2.2 Accelerating ageing
46、 Measurements shall be made on test specimens cut from the hoses. After ageing for 7 days at a temperature of 70 C as specified in ISO 188 (air oven), the tensile strength and elongation at break respectively of the lining and cover shall not decrease from the original values obtained by more than 2
47、5 % for the tensile strength and 50 % for elongation at break. 9.2.3 Adhesion When tested in accordance with ISO 8033:2006 using the type 2 or type 4 test piece, the minimum adhesion between adjacent components shall be 1,5 kN/m. For flux fuel gas hoses, see 9.3.4. For flux fuel gas hoses, the inner
48、 plastic lining should be removed prior to the test. 9.2.4 Hydrostatic requirements The hose, when tested in accordance with ISO 1402 at ambient temperature, shall meet the requirements of Table 3. Table 3 Hydrostatic requirements Rating Light duty (Nominal bore u6,3) Normal duty (all sizes) Maximum
49、 working pressure 1 MPa (10 bar) 2 MPa (20 bar) Proof pressure 2 MPa (20 bar) 4 MPa (40 bar) Minimum burst pressure 3 MPa (30 bar) 6 MPa (60 bar) Change in length at maximum operating pressure 5 % Change in diameter at maximum operating pressure 10 % 9.2.5 Flexibility, general When tested in accordance with ISO 1746 at standard laboratory temperature as defined in ISO 23529 using a diameter of curvature, Dc, of 10di, where diis the internal diameter (with a minimum of 80 mm), the coefficient
