1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 340:2013Conveyor belts Laboratoryscale flammabilitycharacteristics Requirementsand test method (ISO 340:2013)BS EN ISO 340:2013 BRITISH STANDARDNational forewordThis Br
2、itish Standard is the UK implementation of EN ISO 340:2013. Itsupersedes BS EN ISO 340:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/67, Conveyor belts.A list of organizations represented on this committee can beobtained on request to its sec
3、retary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 77350 1ICS 13.220.40; 53.040.20Compliance with a British Stand
4、ard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 340 April 2013 ICS 13.
5、220.40; 53.040.20 Supersedes EN ISO 340:2004English Version Conveyor belts - Laboratory scale flammability characteristics - Requirements and test method (ISO 340:2013) Courroies transporteuses - Caractristiques dinflammabilit dchelle de laboratoire - Exigences et mthode dessai (ISO 340:2013) This E
6、uropean Standard was approved by CEN on 21 January 2013. 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 reference
7、s 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 responsibility of a CEN mem
8、ber 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, Former Yugoslav Republic of Macedonia, Fr
9、ance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES
10、KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 340:2013: EBS EN ISO 340:2013EN ISO 340:2013 (E) 3 Foreword This document (EN ISO 340:2013) has been p
11、repared by Technical Committee ISO/TC 41 “Pulleys and belts (including veebelts)“ in collaboration with Technical Committee CEN/TC 188 “Conveyor belts” the secretariat of which is held by SNV. This European Standard shall be given the status of a national standard, either by publication of an identi
12、cal text or by endorsement, at the latest by October 2013, and conflicting national standards shall be withdrawn at the latest by October 2013. 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 held r
13、esponsible for identifying any or all such patent rights. This document supersedes EN ISO 340:2004. 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, C
14、yprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the Uni
15、ted Kingdom. Endorsement notice The text of ISO 340:2013 has been approved by CEN as EN ISO 340:2013 without any modification. BS EN ISO 340:2013ISO 340:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Requirements 14.1 P
16、eriods of afterflame (after removal of the burner) . 14.2 Non-reappearance of flame (after applying a current of air) . 25 Test method . 25.1 Health and safety . 25.2 Principle 25.3 Test pieces . 25.4 Apparatus 35.5 Location of test 55.6 Conditioning of test pieces . 55.7 Procedure 55.8 Expression o
17、f results 56 Test report . 6Bibliography 7BS EN ISO 340:2013ISO 340:2013(E)ForewordISO (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 te
18、chnical 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, in liaison with ISO, also take part in the work. ISO collaborates close
19、ly 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 task of technical committees is to prepare International Standards. Draft I
20、nternational 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.Attention is drawn to the possibility that some of the elements of this document
21、may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 340 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts), Subcommittee SC 3, Conveyor belts.This fourth edition cancels and replaces the third edi
22、tion (ISO 340:2004), which has been technically revised. The word combustion has been changed to flame.iv ISO 2013 All rights reservedBS EN ISO 340:2013INTERNATIONAL STANDARD ISO 340:2013(E)Conveyor belts Laboratory scale flammability characteristics Requirements and test methodCAUTION This method o
23、f test is not designed to assess the fire hazard of any given product. The results may help in the assessment of ignition hazard but should not be used in isolation as evidence that a product or material is safe.1 ScopeThis International Standard specifies a method for assessing, on a small scale, t
24、he reaction of a conveyor belt to an ignition flame source. It is applicable to conveyor belts having a textile carcass as well as steel cord conveyor belts.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its a
25、pplication. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 8056-1, Aircraft Nickel-chromium and nickel-aluminium thermocouple extension cables Part 1: Conductors General requirements a
26、nd testsISO 9162, Petroleum products Fuels (class F) Liquefied petroleum gases SpecificationsISO 18573, Conveyor belts Test atmospheres and conditioning periods3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1afterflameflame which persists after
27、the ignition source has been removedSOURCE: ISO 13943:2008, 4.63.2flamezone of combustion in the gaseous phase, usually with emission of lightSOURCE: ISO 13943:2008, 4.1333.3flameto undergo combustion in the gaseous phase with emission of lightSOURCE: ISO 13943:2008, 4.1344 Requirements4.1 Periods o
28、f afterflame (after removal of the burner)The sum of the periods of flame for each of the series of six tests (see 5.3) shall be less than 45 s and no individual value shall be greater than 15 s (see 5.7.5). ISO 2013 All rights reserved 1BS EN ISO 340:2013ISO 340:2013(E)4.2 Non-reappearance of flame
29、 (after applying a current of air)The flame shall not re-appear (see 5.7.6).5 Test method5.1 Health and safety5.1.1 Smoke and fumesThe ignition and burning of polymeric materials can cause smoke and toxic gases to be released, which can affect the health of operators. It is therefore of great import
30、ance that suitable means be provided to clear the test area of smoke and fumes.5.1.2 Handling, storage and disposal of liquefied petroleum gas containersAll the relevant local safety regulations shall be taken into account for the handling and storage of liquefied petroleum gas (LPG) and for the dis
31、posal of used LPG containers.If local safety regulations require the LPG cylinders to be stored in an environment that is cooler than the test area or some distance from the test rig, a sufficient length of tubing is needed inside the controlled environment to ensure that the gas equilibrates to the
32、 required temperature before flow measurement. One way to facilitate this is to pass the gas (before flow measurement) through a metal tube immersed in water maintained at 25 C.5.2 PrincipleA test piece cut from a conveyor belt is suspended vertically above a gas flame for a specified time, after wh
33、ich the gas flame is removed. The afterflame time is measured. Any re-flame is noted when the test piece is later subjected to a current of air.5.3 Test pieces5.3.1 GeneralThe test pieces described in 5.3.2 and 5.3.3 shall be taken at a minimum distance of 50 mm from the edges of the belt.5.3.2 Conv
34、eyor belting with a textile carcass5.3.2.1 For tests on conveyor belts with and without covers5.3.2.1.1 Prepare 12 test pieces, each (200 mm 5 mm) (25 mm 1 mm) as follows:a) three test pieces, with covers intact, in the longitudinal direction of the conveyor belt;b) three test pieces, with covers in
35、tact, in the transverse direction of the conveyor belt;c) three test pieces, with covers removed (see 5.3.2.1.2), in the longitudinal direction of the conveyor belt;d) three test pieces, with covers removed (see 5.3.2.1.2), in the transverse direction of the conveyor belt.5.3.2.1.2 Covers may be rem
36、oved see 5.3.2.1.1 c) and d) by stripping, cutting or buffing. If covers are removed by buffing, care should be exercised to ensure that the test piece is not overheated or that any threads of a textile carcass are not damaged.2 ISO 2013 All rights reservedBS EN ISO 340:2013ISO 340:2013(E)5.3.2.2 Fo
37、r tests on conveyor belts with covers intactIf the product specification requires the test to be conducted on conveyor belts with the covers intact, conduct only six tests on test pieces as described in 5.3.2.1.1 a) and b).5.3.2.3 For tests on conveyor belts designed for use without coversIf the pro
38、duct specification requires the test to be conducted on conveyor belts which are by design intended to be used without covers, conduct only six tests on test pieces as described in 5.3.2.1.1 c) and d).5.3.3 Steel cord conveyor belts5.3.3.1 For tests on conveyor belts with covers intactIf the product
39、 specification requires the test to be conducted on conveyor belts with the covers intact, cut six test pieces in the longitudinal direction of the belt, each 200 mm 5 mm long, as close as possible to 25 mm wide depending on the cord diameter and pitch. Each test piece shall be at least 20 mm wide a
40、nd contain at least two cords, with the cut edges representing the centreline between adjacent cords.5.3.3.2 For tests on conveyor belts with covers removedIf the product specification requires the test to be conducted on conveyor belts without covers, cut six test pieces as described in 5.3.3.1 and
41、 remove the covers, e.g. by stripping, cutting or buffing.5.4 Apparatus5.4.1 Gas burner (Bunsen type), having a burner tube with an inside diameter of 10 0,5 mm, as illustrated in Figure 1.5.4.2 Commercial propane gas, as specified in ISO 9162. ISO 2013 All rights reserved 3BS EN ISO 340:2013ISO 340
42、:2013(E)Dimensions in millimetresKey1 thermocouple (see 5.4.6)a Direction of air current to be applied after removal of burner.Figure 1 Illustration of gas burner and test piece configuration during test5.4.3 Timing devices, capable of being read to 0,2 s or less.5.4.4 Measuring devices, graduated i
43、n millimetres or submultiples of millimetres and calibrated to an appropriate accuracy.5.4.5 Test piece holder and location clips, consisting of a rectangular frame not less than 500 mm high, having two sides spaced 75 mm apart on which are fitted suitable clips for mounting the test piece in a vert
44、ical plane at least 20 mm from the frame. The frame is fitted onto a suitable support to maintain the sides in a vertical orientation during the test.As some products of combustion are corrosive, the test apparatus should be constructed of material that will not be adversely affected.5.4.6 Calibrate
45、d NiCr/NiAl thermocouple, as specified in ISO 8056-1 or its equivalent.5.4.7 Means of applying a current of air, having a normal oxygen content and a relative humidity no greater than 80 % at a temperature not exceeding 30 C at a velocity of 1,5m/s.4 ISO 2013 All rights reservedBS EN ISO 340:2013ISO
46、 340:2013(E)5.5 Location of testA location in which the air movement is less than 0,2 m/s at the commencement of the test and is not further influenced by mechanical devices operating during the test is required. The volume of air surrounding the test location shall be such that the test is not affe
47、cted by any reduction of oxygen concentration. If an open-fronted cabinet is used for the test, provision shall be made to permit the test piece to be mounted at least 300 mm from any wall.5.6 Conditioning of test piecesAfter preparation of the test pieces as described in 5.3, ensure that they are i
48、n equilibrium with one of the standard atmospheres for conditioning and testing specified in ISO 18573.5.7 Procedure5.7.1 Carry out the test in an atmosphere having a temperature between 10 C and 30 C and a relative humidity between 15 % and 80 %, preferably at the same temperature and relative humi
49、dity used for conditioning or in the atmosphere applicable at the site of use, if known.5.7.2 Place the test piece in the clips of the test rig (5.4.5), ensuring that the test piece is in the vertical position.5.7.3 Light the burner and preheat it for 2 min. Adjust the gas flow to give a total flame height of between 150 mm to 180 mm, with an inner flame length of approximately 50 mm.Position the thermocouple (5.4.6) in the hottest part of the flame (i.e. just above the inner flame cone as shown in Figu
