BS ISO 8573-4-2001 Compressed air - Test methods for solid particle content《压缩空气 固体颗粒含量的试验方法》.pdf

1、BRITISH STANDARD BS ISO 8573-4:2001 Compressed air Part 4: Test methods for solid particle content ICS 71.100.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Incorporatingcorrigendum April 2002National foreword This British Standard is the UK implementation of ISO 8573-4:20

2、01, incorporating corrigendum April 2002. The UK participation in its preparation was entrusted by Technical Committee MCE/8, Compressors, pneumatic tools, pneumatic machines and vacuum technology, to Subcommittee MCE/8/-/3, Air quality. A list of organizations represented on this Subcommittee can b

3、e 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 cannot confer immunity from legal obligations. BS ISO 8573-4:2001 This British Standa

4、rd, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 2001 BSI 2011 Amendments/corrigenda issued since publication Date Comments 30 June 2011 Implementation of ISO corrigendum

5、April 2002: deletion and addition of text in Clause B.5 ISBN 978 0 580 75541 5Reference number ISO 8573-4:2001(E) INTERNATIONAL STANDARD ISO 8573-4 First edition 2001-06-15 Compressed air Part 4: Test methods for solid particle content Air comprim Partie 4: Mthodes dessai pour la dtermination de la

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9、 sserdda givne lebwo. ISO 1002 All rhgits rsevre.de elnUss towrehise scepfidei, on trap of tihs cilbuptanoi mya eb cudorperde ro utzilide ni yna form ro yb yna snaem, eelctinorc ro mecinahcal, inclidugn tohpociypong dna micrfoilm, wittuoh repmissino in writing form eitreh ISO at teh erddass lebwo ro

10、 ISOs memreb ydob in the ctnuoyr of the rtseuqee.r ISO cirypothg fofice saCe tsopale 65 1121-HC aveneG 20 leT. + 41 22 947 10 11 xaF + 14 22 947 90 74 E-mail cirypothgiso.ch eWb www.iso.ch ii ISO 1002 All irhgts seredevr BS ISO 8573-4:2001 ISO 8573-4:2001 (E) ISO 1002 All rights rsedevre iii Content

11、s Page Foreword.iv 1 Scope 1 2 Normative references 1 3 Terms and definitions .1 4 Units 2 5 Particle classes2 5.1 Solid particles 2 5.2 Microbiological particles.2 5.3 Aerodynamic particle diameter 2 6 Selection of method 2 7 Sampling techniques.3 7.1 General3 7.2 Full-flow sampling .3 7.3 Isokinet

12、ic sampling .4 7.4 Reducing system pressure before measurement 7 7.5 Average values.7 7.6 Operating conditions.7 8 Measurement methods7 8.1 General7 8.2 Laser particle counting .8 8.3 Condensation nucleus counting8 8.4 Differential mobility analysis8 8.5 Scanning mobility particle sizing.8 8.6 Sampl

13、ing on membrane surface in conjunction with a microscope8 9 Evaluation of test results 8 9.1 Reference conditions 8 9.2 Influence of humidity.9 9.3 Influence of pressure 9 9.4 Influence of temperature.9 9.5 Influence of other contaminants 9 10 Uncertainty .9 11 Test report 9 11.1 Statements9 11.2 St

14、atement format .10 Annex A (informative) Sample test report on determination of solid particle content in compressed air 11 Annex B (informative) Description of measurement methods .12 Bibliography14 BS ISO 8573-4:2001 ISO 8573-4:2001 (E)iv ISO 1002 All rights rsedevre Foreword ISO (the Internationa

15、l 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. Each member body interested in a subject for which a technical committee has been es

16、tablished 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 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardi

17、zation. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. 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 least 7

18、5 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO 8573 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 8573-4 was prepared by Te

19、chnical Committee ISO/TC 118, Compressors, pneumatic tools and pneumatic machines, Subcommittee SC 4, Quality of compressed air. ISO 8573 consists of the following parts, under the general title Compressed air: Part 1: Contaminants and purity classes Part 2: Test methods for aerosol oil content Part

20、 3: Test methods for measurement of humidity Part 4: Test methods for solid particle content Part 5: Determination of oil vapour and organic solvent content Part 6: Determination of content of gaseous contaminants Part 7: Test methods for viable microbiological particle content Part 8: Test methods

21、for mass concentration of solid particle content Part 9: Test methods for liquid water content Annexes A and B of this part of ISO 8573 are for information only. BS ISO 8573-4:2001 ISO 8573-4:2001 (E)INTERNATIONAL STANDARD ISO 1002 All rights rsedevre 1 Compressed air Part 4: Test methods for solid

22、particle content 1 Scope This part of ISO 8573 provides a guide for choosing a suitable method to determine the solid particle concentration in compressed air, expressed as the number of solid particles in respective size classes. It describes the limitations of the various methods. This part of ISO

23、 8573 identifies sampling techniques and measurement methods based on the counting of particles, and describes the evaluation, uncertainty considerations and reporting of the air purity parameter, solid particles. NOTE 1 The test methods described in this part of ISO 8573 are those suitable for dete

24、rmining the purity classes given in ISO 8573-1. NOTE 2 Particle content determined as mass concentration is dealt with in ISO 8573-8. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 8573. For

25、 dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 8573 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undat

26、ed references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1217, Displacement compressors Acceptance tests. ISO 3857-1, Compressors, pneumatic tools and machines Vocabulary Part 1: General

27、. ISO 5167-1, Measurement of fluid flow by means of pressure differential devices Part 1: Orifice plates, nozzles and Venturi tubes inserted in circular cross-section conduits running full. ISO 5598, Fluid power systems and components Vocabulary. 3 Terms and definitions For the purposes of this part

28、 of ISO 8573, the terms and definitions given in ISO 5598, ISO 3857-1 and ISO 1217 and the following apply. 3.1 solid particle discrete mass of solid matter BS ISO 8573-4:2001 ISO 8573-4:2001 (E)2 ISO 1002 All rights rsedevre 3.2 microbiological particle solid particle that has the property of formi

29、ng viable colony units 3.3 aerodynamic particle diameter diameter of a sphere of density of 1 g/cm 3 w i t ht h es a m es e t t l i n gv e l o c i ty ,d u et og r a v i t a t i o n a lf o r c ei nc a l ma i r ,a s the particle under the prevailing conditions of temperature, pressure and relative hum

30、idity 4U n i t s For the purposes of this part of ISO 8573, the following non-preferred units are used: 1 bar = 100 000 Pa 1 l (litre) = 0,001 m 3 bar(e) = effective pressure 5 Particle classes 5.1 Solid particles Solid particles are characterized by their properties of shape, size, density and hard

31、ness. Solid particles include microbiological units. Reference is made to microbiological particles in this part of ISO 8573 to identify what problems may arise that can affect the discrimination of non-microbiological particles from microbiological particles and when to use this part of ISO 8573 or

32、 ISO 8573-7. The influence of liquids on particle size and number must be eliminated in order to obtain a correct reading. The influence of liquids other than water shall be given due consideration when selecting a test method. In order to discriminate non-microbiological particles from microbiologi

33、cal particles, measurements must be taken within a period of 4 h. 5.2 Microbiological particles This part of ISO 8573 should be used to count the number of microbiological particles present in a sample. The method used to count the particles does not identify microbiological particles directly, ther

34、efore if more information is required, ISO 8573-7 should be used to determine their viability. 5.3 Aerodynamic particle diameter Aerodynamic particle diameter is a function of density. For the purposes of the test methods described in this part of ISO 8573, it is assumed that solid particles have un

35、iform density. 6 Selection of method The method to be selected depends on the concentration range and the sizes of solid particles in the compressed air. For choosing the method most suitable for the concentration range and sizes of particles estimated to be present in the sample, see Table 1. The a

36、pplicability of particular measurement equipment to a method should be verified with the equipment manufacturer. BS ISO 8573-4:2001 ISO 8573-4:2001 (E) ISO 1002 All rights rsedevre 3 Table 1 Guide to selection of method Method Applicable concentration range particles/m 3 Applicable solid particle di

37、ameter d m u u u u 0,10 0,5 1 u u u u 5 Laser particle counter 0 to 10 5 Condensation nucleus counter 10 2 to 10 8 Differential mobility analyser Not applicable Scanning mobility particle sizer 10 2 to 10 8 Sampling on membrane surface in conjunction with a microscope 0t o1 0 3 7 Sampling techniques

38、 7.1 General Solid particles can be measured at atmospheric pressure or under ambient pressure conditions depending on the equipment used. Measurement can be carried out at partial or full flow. a) Full flow sampling of total airflow. b) Partial flow sample taken from a percentage of the airflow. If

39、 the particle diameter is greater than 1 m, then sampling shall be isokinetic. 7.2 Full-flow sampling 7.2.1 General For full-flow sampling using physical methods, if the particle diameter is greater than 0,5 m, a gridded membrane shall be used. The method detailed here deals with the sampling and an

40、alysis of airborne particles at constant flowrate, and permits the quantification and sizing of particles in a compressed air system. Airflow is passed through the test equipment via suitable in-line valves, which have been previously checked to ensure they do not contribute to the level of contamin

41、ation already present. Particular attention shall be paid to the cleanliness of the test equipment, and other precautions shall be taken, e.g. valve purging and stabilization to constant test conditions. Where air is directed to the atmosphere, means should be taken to ensure that the system pressur

42、e is maintained. The temperature and velocity ranges shall be within the ranges specified by the manufacturer. Using this method, the total airflow passes through the sampling equipment. BS ISO 8573-4:2001 ISO 8573-4:2001 (E)4 ISO 1002 All rights rsedevre 7.2.2 Test equipment Full-flow sampling shal

43、l be carried out by gridded membrane only. The general arrangement of the test equipment for full-flow sampling is shown in Figure 1. It is important that the test equipment does not affect the collected sample. As the test apparatus is portable, different test locations may be chosen, provided the

44、stated parameters are not exceeded and suitable valving for insertion of the test equipment into the circuit exists. Key 1 From process 2 Full-flow shut-off valve 3 Membrane holder 4 Device to depressurize membrane holder 5 Temperature indicator 6 Pressure indicator 7 Flow-measuring device 8 To atmo

45、sphere or process 9 Optional by-pass A Minimum distance to discharge to atmosphere as specified in ISO 5167-1 Figure 1 Test equipment for full-flow sampling 7.3 Isokinetic sampling 7.3.1 General Accurate isokinetic sampling is not critical for small particles (less than 1 m), although approximate is

46、okinetic conditions are advisable. Isokinetic sampling devices should exhibit the following characteristics. BS ISO 8573-4:2001 ISO 8573-4:2001 (E) ISO 1002 All rights rsedevre 5 a) The probe should be a minimum distance of 10 pipe diameters from upstream bends or restrictions and 3 diameters from d

47、ownstream bends or restrictions. b) The size of the probe should not influence the air stream. The nozzles may vary in shape and construction (see 7.3.3). c) Impaction onto the internal surface of the probe should be taken into account. d) Turbulent flow conditions within the main air stream are req

48、uired (Reynolds number Re greater than 4 000). In normal industrial use, compressed air is in a state of turbulent flow, which occurs when the following conditions are met: QW 20 D where Q is the pipe flowrate, in litres per second (at reference conditions); D is the actual compressed air pipe diame

49、ter, in millimetres. NOTE Under the test conditions specified, scanning across the pipe diameter with a sampling probe is unnecessary. 7.3.2 Equipment set-up for isokinetic sampling The set-up for the isokinetic sampling probe at the insertion point of the compressed air system under investigation is shown in Figure 2. Key 1 Sampling probe in the main pipe 2 Adjustable gland to allow adjustment of probe 3 Direction of air flow a Main pipe diameter, D b Minimum straight length before probe, 10 D c Pr