1、BSI Standards PublicationBS EN 15051-3:2013Workplace exposure Measurement of the dustinessof bulk materialsPart 3: Continuous drop methodBS EN 15051-3:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 15051-3:2013.Together with BS EN 15051-1:2013 and BS EN 15
2、051-2:2013 itsupersedes BS EN 15051:2006, which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/2/2, Work place atmospheres.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport t
3、o 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 76566 7ICS 13.040.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、 British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2013.Amendments issued since publicationDate Text affectedBS EN 15051-3:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15051-3 November 2013 ICS 13.040.30 Supersedes EN 15051:20
5、06English Version Workplace exposure - Measurement of the dustiness of bulk materials - Part 3: Continuous drop method Exposition sur les lieux de travail - Mesure du pouvoir de resuspension des matriaux pulvrulents en vrac - Partie 3: Mthode de la chute continue Exposition am Arbeitsplatz - Messung
6、 des Staubungsverhaltens von Schttgtern - Teil 3: Verfahren mit kontinuierlichem Fall This European Standard was approved by CEN on 28 September 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status
7、 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, Germ
8、an). 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-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia
9、, Cyprus, 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 Unit
10、ed Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC 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
11、15051-3:2013 EBS EN 15051-3:2013EN 15051-3:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Requirements .6 4.1 General 6 4.2 Condition of the bulk material 6 4.3 Sample and environmental control 6 4.4 Moisture content 6 4.5 Bulk den
12、sity 6 4.6 Test procedure .6 4.7 Replicate tests 6 4.8 Reporting 6 5 Continuous drop method 6 5.1 Description of test apparatus .6 5.2 Filters 8 5.3 Ancillary equipment 8 5.4 Preparation of test sample 8 5.5 Preparation of test apparatus .9 5.6 Test procedure .9 5.7 Weighing the filters9 5.8 Determi
13、nation of the inhalable and respirable dustiness mass fractions 10 6 Evaluation of dustiness . 10 7 Test report . 11 Bibliography . 12 BS EN 15051-3:2013EN 15051-3:2013 (E) 3 Foreword This document (EN 15051-3:2013) has been prepared by Technical Committee CEN/TC 137 “Assessment of workplace exposur
14、e to chemical and biological agents”, 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 identical text or by endorsement, at the latest by May 2014, and conflicting national standards shall be withdrawn at th
15、e latest by May 2014. 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 responsible for identifying any or all such patent rights. This document, together with EN 15051-1:2013 and EN 15051-2:2013
16、, supersedes EN 15051:2006. The major technical changes between this European Standard and the previous edition are as follows: a) EN 15051:2006 has been split into three parts (see below); b) the test methods given are no longer referred as reference test methods; c) the test of equivalence between
17、 an alternative (candidate) test method and any of the test methods now given in EN 15051-2 and this European Standard have been deleted. EN 15051 Workplace exposure Measurement of the dustiness of bulk materials consists of the following parts: Part 1: Requirements and choice of test methods; Part
18、2: Rotating drum method; Part 3: Continuous drop method. 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, Cyprus, Czech Republic, Denmark, Estonia, Fi
19、nland, 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 United Kingdom. BS EN 15051-3:2013EN 15051-3:2
20、013 (E) 4 Introduction This European Standard gives details of the design and operation of the continuous drop test method that classifies the dustiness of solid bulk materials, in terms of health-related fractions. A dustiness classification is presented to provide users (e.g. manufacturers, produc
21、ers, occupational hygienists and workers) with information on the potential for dust emissions when the bulk material is handled or processed in workplaces. It provides the manufacturers of bulk materials with information that can help to improve their products. It allows the users of the bulk mater
22、ials to assess the effects of pre-treatments, and also to select less dusty products, if available. It is envisaged that different branches of industry might develop their own classification schemes using experimentally determined dustiness values of the bulk materials of interest. Although this Eur
23、opean Standard does not discuss the analysis of dust released from bulk materials (except in terms of health-related fractions), the test method produces samples with the potential for chemical analysis of the contents. This European Standard was developed based on the results of the European projec
24、t SMT4-CT96-2074 “Development of a Method for Dustiness Testing” (see 1). This project investigated the dustiness of 12 bulk materials, with the intention to test as wide a range of bulk materials as possible, i.e. magnitude of dustiness, industrial sectors, chemical composition and particle size di
25、stribution. Meanwhile the method has been applied to investigate the dustiness of more than 500 different bulk materials (see 2). BS EN 15051-3:2013EN 15051-3:2013 (E) 5 1 Scope This European Standard specifies the continuous drop test apparatus and associated test method for the reproducible produc
26、tion of dust from a bulk material under standard conditions, and the measurement of the inhalable and respirable fractions of this dust, with reference to existing European Standards, where relevant (see Clause 6). The continuous drop method intends to simulate dust generation processes where there
27、are continuous falling operations (conveying, discharging, filling, refilling, weighing, sacking, metering, loading, unloading etc.) and where dust is liberated by winnowing during falling. It can be modified to measure the thoracic fraction as well, but this modification is not described in this Eu
28、ropean Standard. It differs from the rotating drum method presented in EN 15051-2 in that in this European Standard, the bulk material is dropped only once, but continuously, while in EN 15051-2, the same bulk material is repeatedly dropped. Furthermore, this European Standard specifies the environm
29、ental conditions, the sample handling and analytical procedures and the method of calculating and presenting the results. A classification scheme for dustiness is specified, to provide a standardised way to express and communicate the results to users of the bulk materials. This European Standard is
30、 applicable to powdered, granular or pelletised bulk materials. This European Standard is not applicable to test the dust released when solid bulk materials are mechanically treated (e.g. cut, crushed) or to evaluate handling procedures for the bulk materials. 2 Normative references The following do
31、cuments, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1540, Workplace expo
32、sure - Terminology prEN 13205-1, Workplace exposure - Assessment of sampler performance for measurement of airborne particle concentrations - Part 1: General requirements EN 15051-1:2013, Workplace exposure - Measurement of the dustiness of bulk materials - Part 1: Requirements and choice of test me
33、thods EN 22768-1, General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1) EN ISO 13137, Workplace atmospheres - Pumps for personal sampling of chemical and biological agents - Requirements and test methods (ISO 13137) ISO 15767,
34、 Workplace atmospheres - Controlling and characterizing uncertainty in weighing collected aerosols 3 Terms and definitions For the purpose of this document, the terms and definitions given in EN 1540 and EN 15051-1 apply. NOTE In particular, the following terms of EN 1540 are used in this document:
35、airborne dust, collected sample, dustiness, inhalable fraction, respirable fraction, thoracic fraction and health related fractions. BS EN 15051-3:2013EN 15051-3:2013 (E) 6 4 Requirements 4.1 General The test procedures described in EN 15051-1:2013, Clause 5 shall be applied. 4.2 Condition of the bu
36、lk material The bulk material shall be delivered in air-tight containers and shall be tested in the state in which it was received (moisture content, particle size distribution, etc.). 4.3 Sample and environmental control Bulk materials that have a large specific surface area are sensitive to enviro
37、nmental conditions such as relative humidity, temperature and electrostatic effects. Additionally, the bulk materials moisture content, compaction, agglomeration etc. will have an influence on the results of the dustiness measurements. Therefore, for accurate results the test atmosphere shall be wit
38、hin a narrow range of temperature and humidity. In all cases the environmental conditions shall be documented. The following test conditions shall apply: relative humidity (RH): (50 10) %; temperature: (21 3) C. The test apparatus shall be electrically grounded. A separate determination of the parti
39、cle size will provide valuable information. 4.4 Moisture content The moisture content of the bulk material shall be determined and documented according to the procedure given in EN 15051-1:2013, 5.4 and Annex A. 4.5 Bulk density The bulk density of the test material shall be determined and documente
40、d according to the procedure given in EN 15051-1:2013, Annex B. 4.6 Test procedure The dustiness shall be tested according to the continuous drop test method described in Clause 5. 4.7 Replicate tests Replicate tests shall be carried out according to 5.6. 4.8 Reporting The test results shall be repo
41、rted as specified in Clause 7. 5 Continuous drop method 5.1 Description of test apparatus The test apparatus required to determine the dustiness of bulk materials is shown in Figure 1. BS EN 15051-3:2013EN 15051-3:2013 (E) 7 Dimensions in millimetres Key 1 sample tank 2 metering device 3 drop pipe 4
42、 pump for sampling the inhalable fraction of aerosol 5 sampler for the inhalable fraction of aerosol 6 backflow pipe 7 collector tank 8 sampler for the respirable fraction of aerosol 9 pump for sampling the respirable fraction of aerosol 10 main flow pump General tolerances according to EN 22768-1 F
43、igure 1 null Outline of the continuous drop test apparatus The sample tank (1) shall be large enough to hold the entire mass of the test substance for all the intended test runs. It shall be made of inert material, preferably stainless steel. BS EN 15051-3:2013EN 15051-3:2013 (E) 8 The type of meter
44、ing device (2) is not regulated. The metering device shall not change the composition and properties of the test material and be suited for mass flows in the intended range of 6 g min1to 10 g min1. EXAMPLE Examples of successfully tested metering devices are metering screws and vibrating ducts. The
45、drop pipe (3) is a thin-walled tube with an inner diameter in the range from 16 mm to 25 mm. The drop pipe is preferably made from stainless steel. The backflow pipe (6) is round with an inner diameter of 150 mm. It shall be manufactured from an inert and electrically conducting material, preferably
46、 stainless steel. Within the backflow pipe a vertical air speed of 0,050 m s1shall be generated. Small parts of the tube may be made of transparent material, for example glass, in order to allow visible control of the experiments. The reference values for the airflows of the main flow pump (10), the
47、 pump for sampling the respirable fraction of aerosol (9) and the pump for sampling the inhalable fraction of aerosol (4) are 49 l min1and 2 l min1, respectively. The reference value for the airflow in the back flow pipe is 53 l min1. The reference flow for the samplers is 2 l min1. These conditions
48、 may be changed within narrow limits as long as the air speed within the pipe is (0,050 0,002 5) m s1(i.e. a total airflow of 53 l min1), and no sampling airflow exceeds 3,5 l min1. The sampling of the inhalable and the respirable fraction of aerosol shall comply with prEN 13205-1, and the respectiv
49、e pumps shall comply with EN ISO 13137. The collector tank (7) shall be mounted to the backflow pipe (6). It is used to collect the dropped mass and shall therefore be suited for weighing. In addition, the external air which generates the upstream airflow within the backflow pipe (6) needs to pass through the collector tank. NOTE Filter cups have been used successfully as a collector tank. 5.2 Filters Filters with diameters of 37 mm can be used to collect the sampled aerosol fractions. If additional analytical investigati
