EN ISO 15011-3-2009 en Health and safety in welding and allied processes - Laboratory method for sampling fume and gases - Part 3 Determination of ozone emission rate during arc we.pdf

1、BS EN ISO15011-3:2009ICS 13.040.30; 13.100; 25.160.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDHealth and safetyin welding andallied processes Laboratory methodfor sampling fume andgasesPart 3: Determination of ozoneemission rate during arc welding (ISO150

2、11-3:2009)This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2009 BSI 2009ISBN 978 0 580 55640 1Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 15011-3:2009National forewordThis British Standard is the UK impleme

3、ntation of EN ISO 15011-3:2009. It supersedes BS EN ISO 15011-3:2002 which was withdrawn in 2005 at the request of CEN/TC 121/SC 9, as the meth-odology prescribed in the standard had been found to be unsatisfactory.The UK participation in its preparation was entrusted to Technical Committee WEE/40,

4、Health and safety in welding.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard

5、 cannot confer immunity from legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 15011-3 October 2009 ICS 25.160.10; 13.100 Supersedes EN ISO 15011-3:2002English Version Health and safety in welding and allied processes - Laboratory method for sampling fume and gases - Part 3:

6、 Determination of ozone emission rate during arc welding (ISO 15011-3:2009) Hygine et scurit en soudage et techniques connexes - Mthode de laboratoire dchantillonnage des fumes et des gaz - Partie 3: Dtermination du dbit dmission dozone lors du soudage larc (ISO 15011-3:2009) Arbeits- und Gesundheit

7、sschutz beim Schweien und bei verwandten Verfahren - Laborverfahren zum Sammeln von Rauch und Gasen - Teil 3: Bestimmung der Emissionsrate von Ozon beim Lichtbogenschweien (ISO 15011-3:2009)This European Standard was approved by CEN on 29 September 2009. CEN members are bound to comply with the CEN/

8、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 concerning such national standards may be obtained on application to the CEN Management Centre or to

9、 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 its own language and notified to the CEN Management Centre has the same status as the official versio

10、ns. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spa

11、in, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national M

12、embers. Ref. No. EN ISO 15011-3:2009: EBS EN ISO 15011-3:2009EN ISO 15011-3:2009 (E) 3 Foreword This document (EN ISO 15011-3:2009) has been prepared by Technical Committee ISO/TC 44 “Welding and allied processes” in collaboration with Technical Committee CEN/TC 121 “Welding” the secretariat of whic

13、h is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2010, and conflicting national standards shall be withdrawn at the latest by April 2010. Attention is drawn to the possibili

14、ty that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 15011-3:2002. According to the CEN/CENELEC Internal Regulations, the national standards o

15、rganizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal

16、, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 15011-3:2009 has been approved by CEN as a EN ISO 15011-3:2009 without any modification. BS EN ISO 15011-3:2009ISO 15011-3:2009(E) ISO 2009 All rights reserved iiiContents Page Forewo

17、rd iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Principle .2 5 Equipment and materials2 6 Tests procedures.4 6.1 Welding procedure selection .4 6.2 Setting up the test equipment4 6.3 Trial tests5 6.4 Emission rate testing 5 7 Calculating and reporting the results6

18、Annex A (informative) Equipment notes.7 Annex B (informative) Welding parameters for ozone emission rate testing.9 Annex C (normative) Test procedures11 Annex D (normative) Calculation of the average stable ozone concentration.12 Annex E (normative) Test report .13 Bibliography14 BS EN ISO 15011-3:2

19、009ISO 15011-3:2009(E) iv ISO 2009 All rights reservedForeword 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.

20、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 closely with the Internat

21、ional 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 International Stand

22、ards 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 may be the subjec

23、t of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15011-3 was prepared by Technical Committee ISO/TC 44, Welding and allied processes, Subcommittee SC 9, Health and safety. This second edition cancels and replaces the first edition (15011-3:2002

24、), which has been technically revised. ISO 15011 consists of the following parts, under the general title Health and safety in welding and allied processes Laboratory method for sampling fume and gases: Part 1: Determination of fume emission rate during arc welding and collection of fume for analysi

25、s Part 2: Determination of the emission rates of carbon monoxide (CO), carbon dioxide (CO2), nitrogen monoxide (NO) and nitrogen dioxide (NO2) during arc welding, cutting and gouging Part 3: Determination of ozone emission rate during arc welding Part 4: Fume data sheets Part 5: Identification of th

26、ermal-degradation products generated when welding or cutting through products composed wholly or partly of organic materials The following part is under preparation: Part 6: Procedure for quantitative determination of fume and gases from resistance spot welding Technical Specification Request for an

27、 official interpretation of technical aspects of this part of ISO 15011 should be directed to the secretariat of ISO/TC 44/SC 9 via the users national standardization body; a listing of these bodies can be found at www.iso.org. BS EN ISO 15011-3:2009ISO 15011-3:2009(E) ISO 2009 All rights reserved v

28、Introduction Welding and allied processes generate fume and gases, which, if inhaled, can be harmful to human health. Knowledge of the composition and the emission rates of the fume and gases can be useful to occupational health professionals in assessing worker exposure and in determining appropria

29、te control measures. Absolute exposure is dependent upon factors such as welder position with respect to the plume and draughts and cannot be predicted from emission rate data. However, in the same work situation, a higher emission rate is expected to correlate with a higher exposure and a lower emi

30、ssion rate with a lower exposure. Hence, emission rate data can be used to predict relative changes in exposure that might occur in the workplace under different welding conditions and to identify measures for reducing such exposure, but they cannot be used to calculate ventilation requirements. Thi

31、s part of ISO 15011 defines a method for measuring the emission rate of ozone during arc welding using a hood technique. The procedure simply prescribes a methodology, leaving selection of the test parameters to the user, so that the effects of different variables can be evaluated. Research 2has sho

32、wn that differences in ozone emission rate measured using this technique correlate well with changes in exposure in the workplace. It is assumed that the executions of the provisions and the interpretation of the results obtained in this part of ISO 15011 are entrusted to appropriately qualified and

33、 experienced people. BS EN ISO 15011-3:2009BS EN ISO 15011-3:2009INTERNATIONAL STANDARD ISO 15011-3:2009(E) ISO 2009 All rights reserved 1Health and safety in welding and allied processes Laboratory method for sampling fume and gases Part 3: Determination of ozone emission rate during arc welding 1

34、Scope This part of ISO 15011 defines a laboratory method for measuring the emission rate of ozone during arc welding, using a hood technique. The method is directed primarily at measuring ozone emission rate when using gas-shielded arc welding processes, but it can also be employed with other proces

35、ses, e.g. self-shielded flux-cored arc welding, provided that welding can be performed automatically under the hood. The method can be used to evaluate the effects of welding wires, welding parameters, processes, shielding gases, test piece composition and test piece surface condition on emission ra

36、te. 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 amendments) applies. ISO/TR 25901 Welding a

37、nd related processes Vocabulary ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/TR 25901 and the following apply. 3.1 bubble flow

38、meter primary device for measuring gas flow rate, where the time for a bubble of gas, defined by a soap film, to pass through a calibrated volume in a vertical tube is measured 3.2 test chamber semi-enclosed, continuously extracted chamber used in emission rate tests performed during arc welding, cu

39、tting or gouging operations NOTE Test chambers generally fall into three generic types: a test chamber without a floor, widely referred to as a “hood”; a test chamber having a floor, widely referred to as a “fume box”; a “fume box”, in which the floor of the test chamber is easily removed and replac

40、ed, facilitating its ready interconversion to and from a “hood”. BS EN ISO 15011-3:2009ISO 15011-3:2009(E) 2 ISO 2009 All rights reserved4 Principle Arc welding is performed automatically, on a test piece, inside a continuously extracted test chamber of the “hood” type. The ozone concentration (in m

41、illilitres per cubic metre) at a fixed sampling position inside the hood and the air flow rate through the hood (in cubic metres per minute) are measured. The ozone emission rate (in millilitres per minute) is calculated by multiplying the ozone concentration at the fixed measuring point by the air

42、flow rate. 5 Equipment and materials 5.1 Hood, semi-enclosed, continuously extracted chamber of the “hood” type, in which ozone emission rate tests are performed during arc welding. The hood shall be designed in accordance with the dimensions shown in Figure 1. The sampling position shall be 1 000 m

43、m vertically from the base of the hood. The inside of the hood shall be non-reflecting. NOTE See A.1 for guidance on the construction of the hood. 5.2 Extraction unit, capable of maintaining an air flow rate of 2 m3/min through the hood (5.1), such that the ozone emitted is contained, but not so hig

44、h as to compromise weld metal integrity (see A.2). The precise characteristics of the extraction unit are not critical. 5.3 Ozone meter and logging system, consisting of a calibrated ozone meter employing the chemiluminescence principle of measurement. The meter shall be capable of measuring ozone c

45、oncentrations up to 10 ml/m3. The ozone meter shall be connected to a digital logging system with a logging frequency of 1 s or less (see A.3). Ozone meters that provide equivalent performance to that obtained with chemiluminescence meters may also be used. The calibration of the meter shall be trac

46、eable to national standards. 5.4 Sampling system, consisting of a sampling line between the sampling point and the ozone meter, manufactured from polytetrafluoroethylene (PTFE) or stainless steel or a combination of both. The sampling line shall have an internal diameter of 10 mm or less and shall b

47、e as short as is reasonably practicable. Fume shall be prevented from entering the sampling line using a PTFE filter. The filter shall be placed as close as is reasonably practicable to the sampling point (see A.4). 5.5 Ozone generator, used to precondition the sampling line and to calibrate the ozo

48、ne meter. NOTE Sometimes, ozone meters and generators are incorporated into the same piece of equipment. If an ozone generator is used to calibrate the ozone meter (5.3), its calibration shall be traceable to national standards. BS EN ISO 15011-3:2009ISO 15011-3:2009(E) ISO 2009 All rights reserved

49、3Dimensions in millimetres Key 1 damper (if used) 2 extraction unit 3 manometer (if used) 4 polytetrafluoroethylene (PTFE) filter 5 ozone meter connected to sampling point 6 welding torch 7 hood 8 test piece 9 traverse aAir flow rate measuring point. Figure 1 Hood design for ozone emission rate testing 5.6 Equipment for measuring air flow rate, capable of measuring an air flow rate of 2 m3/min to within 5 % or better. The following combinations of equipment are suitable (see A.5). A calibrated anemometer