1、BSI Standards PublicationBS EN 15051-2:2013Workplace exposure Measurement of the dustinessof bulk materialsPart 2: Rotating drum methodBS EN 15051-2:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 15051-2:2013.Together with BS EN 15051-1:2013 and BS EN 1505
2、1-3:2013 itsupersedes BS EN 15051:2006, which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/2/2, Work place atmospheres.A list of organizations represented on this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 to
3、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 76565 0ICS 13.040.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This B
4、ritish Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2013.Amendments issued since publicationDate Text affectedBS EN 15051-2:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15051-2 November 2013 ICS 13.040.30 Supersedes EN 15051:2006
5、English Version Workplace exposure - Measurement of the dustiness of bulk materials - Part 2: Rotating drum method Exposition sur les lieux de travail - Mesurage du pouvoir de resuspension des matriaux pulvrulents en vrac - Partie 2: Mthode du tambour rotatif Exposition am Arbeitsplatz - Messung des
6、 Staubungsverhaltens von Schttgtern - Teil 2: Verfahren mit rotierender Trommel 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 of a
7、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, German). A
8、 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, Cypr
9、us, 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 United Kin
10、gdom. 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 15051-
11、2:2013: EBS EN 15051-2:2013EN 15051-2:2013 (E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .5 4 Requirements .5 4.1 General 5 4.2 Condition of the bulk material 6 4.3 Sample and environmental control 6 4.4 Moisture content 6 4.5 Bulk density
12、6 4.6 Test procedure .6 4.7 Replicate tests 6 4.8 Reporting 6 5 Rotating drum method 6 5.1 Description of test apparatus .6 5.2 Particle size-selective foams 8 5.3 Filters 8 5.4 Ancillary equipment 8 5.5 Preparation of test sample 8 5.6 Preparation of test apparatus .8 5.7 Running the test apparatus
13、 9 5.8 Weighing the foams and filters 9 5.9 Determination of the inhalable, thoracic and respirable dustiness mass fractions 10 6 Evaluation of dustiness . 10 7 Test report . 11 Bibliography . 12 BS EN 15051-2:2013EN 15051-2:2013 (E) 3 Foreword This document (EN 15051-2:2013) has been prepared by Te
14、chnical Committee CEN/TC 137 “Assessment of workplace exposure 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
15、, and conflicting national standards shall be withdrawn at the 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. Thi
16、s document, together with EN 15051-1:2013 and EN 15051-3:2013, 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 in three parts (see below); b) the test methods given are no longer referred as
17、 reference test methods; c) the test of equivalence between an alternative (candidate) test method and any of the test methods now given in this European Standard and in EN 15051-3:2013 has been deleted. EN 15051 Workplace exposure Measurement of the dustiness of bulk materials consists of the follo
18、wing parts: Part 1: Requirements and choice of test methods; Part 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, Belgiu
19、m, Bulgaria, Croatia, 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, Switzerl
20、and, Turkey and the United Kingdom. BS EN 15051-2:2013EN 15051-2:2013 (E) 4 Introduction This European Standard gives details of the design and operation of the rotating drum test method that classifies the dustiness of solid bulk materials, in terms of health-related fractions. A dustiness classifi
21、cation is presented to provide users (e.g. manufacturers, producers, 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
22、to improve their products. It allows the users of the bulk materials 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 dusti
23、ness values of the bulk materials of interest. Although this European 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 St
24、andard was developed based on the results of the European project 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 dustines
25、s, industrial sectors, chemical composition and particle size distribution. Meanwhile the method has been applied to investigate the dustiness values of more than 220 different bulk materials. BS EN 15051-2:2013EN 15051-2:2013 (E) 5 1 Scope This European Standard specifies the rotating drum test app
26、aratus and associated test method for the reproducible production of dust from a bulk material under standard conditions, and the measurement of the inhalable, thoracic and respirable fractions of this dust, with reference to existing European Standards, where relevant (see Clause 6). This method is
27、 suitable for general bulk material handling processes, including all those processes where the bulk material is dropped, or can be dropped. It differs from the continuous drop method presented in EN 15051-3 in this European Standard, the same bulk material is repeatedly dropped, while in EN 15051-3
28、, the bulk material is dropped only once, but continuously. Furthermore, this European Standard specifies the environmental conditions, the sample handling and analytical procedures, and the method of calculating and presenting the results. A classification scheme for dustiness is specified, to prov
29、ide a standardised way to express and communicate the results to users of the bulk materials. This European Standard is applicable to powdered, granular or pelletised bulk materials. A standard sample volume is used. This European Standard is not applicable to test the dust released when solid bulk
30、materials are mechanically reduced (e.g. cut, crushed) or to evaluate handling procedures for the bulk materials. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the
31、 edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1540, Workplace exposure - Terminology EN 15051-1:2013, Workplace exposure - Measurement of the dustiness of bulk materials - Part 1: Requirements and choice of test m
32、ethods EN 22768-1, General tolerances - Part 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1) ISO 15767, Workplace atmospheres - Controlling and characterizing uncertainty in weighing collected aerosols 3 Terms and definitions For the purpose of t
33、his 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: airborne dust, collected sample, dustiness, inhalable fraction, respirable fraction, thoracic fraction and health related fractions. 4 Requirem
34、ents 4.1 General The test procedures described in EN 15051-1:2013, Clause 5 shall be applied. BS EN 15051-2:2013EN 15051-2:2013 (E) 6 4.2 Condition of the bulk material The bulk material shall be delivered in air-tight containers and shall be tested in the state in which it was received (moisture co
35、ntent, particle size distribution, etc.). 4.3 Sample and environmental control Bulk materials that have a large specific surface area are sensitive to environmental conditions such as relative humidity, temperature and electrostatic effects. Additionally, the bulk materials moisture content, compact
36、ion, agglomeration etc. will have an influence on the results of the dustiness measurements. Therefore, for accurate results the test atmosphere shall be within a narrow range of temperature and humidity. In all cases the environmental conditions shall be documented. The following test conditions sh
37、all apply: relative humidity (RH): (50 10) %; temperature: (21 3) C; The test apparatus shall be electrically grounded. NOTE In many cases, a separate determination of the particle size can be valuable. 4.4 Moisture content The moisture content of the bulk material shall be determined and documented
38、 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 documented according to the procedure given in EN 15051-1:2013, Annex B. 4.6 Test procedure The dustiness shall be tested according to the rotating dr
39、um test method described in Clause 5. 4.7 Replicate tests Replicate tests shall be carried out according to 5.7. 4.8 Reporting The test results shall be reported as specified in Clause 7. 5 Rotating drum method 5.1 Description of test apparatus The test apparatus required to determine the dustiness
40、of bulk materials is shown in Figure 1. BS EN 15051-2:2013EN 15051-2:2013 (E) 7 Dimensions in millimetres Key 1 air flow 2 inlet stage (protective filter) 3 dust generation section - rotating drum 4 outlet stage/dust sampling system (two particle size-selective foam stages and a back-up filter) 5 ro
41、llers 6 in-line mass flow meter 7 control valve 8 vacuum pump 9 timer (timing control circuit) 10 drive motor General tolerances according to EN 22768-1 Figure 1 null Outline of the rotating drum test apparatus The test apparatus comprises a 300 mm diameter stainless steel drum rotating at 4 min1, e
42、quipped with eight longitudinal vanes to lift and let fall a known volume of the bulk material under test (the dust generation section (3), and a three-stage dust sampling system (the outlet stage (4) through which the emitted dust cloud is drawn by a vacuum pump (8) at a flow rate of 38 l min1for t
43、he duration of the test. The stainless steel vanes of 230 mm length and 25 mm height are fixed longitudinally to the internal walls of the drum and point radially inwards towards the centre of the drum. The test apparatus shall be earthed. The dust sampling system (4) comprises two particle size-sel
44、ective foam stages in series followed by a back-up filter. Polytetrafluorethylene (PTFE) spacer rings of size 80 mm diameter and 2 mm thickness are used to separate the two foam stages and the back-up filter to prevent cross contamination. Dust entering the conical passage and into the sampling syst
45、em gives an estimate of the inhalable fraction. The size selectors, in the form of cylindrical plugs of 800 pores per metre (20 pores per inch) and 3 200 pores per metre (80 pores per inch) porous metal foam, are chosen to select the thoracic and the respirable fractions, respectively. The BS EN 150
46、51-2:2013EN 15051-2:2013 (E) 8 foams and the back-up filter are weighed before and after the test to provide the dustiness estimates of the three size fractions. A glass fibre protective filter with a diameter of 150 mm is on the inlet of the drum (2) to prevent dust contamination and to spread the
47、air flow into the drum. The air flow rate through the test apparatus is monitored using an in-line mass flowmeter (6), and this also provides measurement of the volume of air sampled. A timing control circuit (9) automatically controls the operation of the test apparatus. 5.2 Particle size-selective
48、 foams Porous metal foam size selectors with a reticulated open-cell structure are used to select the thoracic and respirable dust fractions 1). Both size selectors have a diameter of 80 mm, the 800 pores per metre (20 pores per inch) foam has two layers of 10 mm thickness, and the 3 200 pores per m
49、etre (80 pores per inch) foam is a single layer of 12 mm thickness. 5.3 Filters Filters with a diameter of 80 mm are used to collect the respirable particles that penetrate the foams. The filter shall have a collection efficiency of at least 99 %. Choice of filter material depends on subsequent analysis. 5.4 Ancillary equipment The balance room or chamber, where weighing is carried out, shall have a temperature and humidity maintained at a stable level, so that an acceptable weighing uncertainty is obtained, see ISO 15767. An analytical balance capable
