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1、BRITISH STANDARD BS ISO 8573-8:2004 Compressed air Part 8: Test methods for solid particle content by mass concentration ICS 71.100.20 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 8573-8:2004 This British Standard was published u
2、nder the authority of the Standards Policy and Strategy Committee on 17 June 2004 BSI 17 June 2004 ISBN 0 580 43960 7 National foreword This British Standard reproduces verbatim ISO 8573-8:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Te
3、chnical Committee MCE/8, Compressors, pneumatic tools, pneumatic machines and vacuum technology, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international pu
4、blications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the
5、necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the
6、interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 8, an insi
7、de back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Refere
8、nce number ISO 8573-8:2004(E) OSI 4002 INTERNATIONAL STANDARD ISO 8573-8 First edition 2004-02-01 Compressed air Part 8: Test methods for solid particle content by mass concentration Air comprim Partie 8: Mthodes dessai pour la dtermination de la teneur en particules solides par concentration massiq
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14、bwww.is.o gro ii ISO 4002 Allr ithgsr esedevr BS ISO 85738:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-3758 O8:(4002E) I SO 4002 All irthgs ersedevr iii Contents Page Forewordiv 1 Scope1 2 Normative references .1 3 Terms and defi
15、nitions.1 4 Units and symbols 2 5 Selection of methods2 6 Sampling techniques2 7 Measurement methods.3 8 Evaluation of test results .6 9 Uncertainty.6 10 Test report7 Annex A (informative) Sample test report8 BS ISO 85738:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00
16、 2006, Uncontrolled Copy, (c) BSI IS-3758 O8:(4002E) iv I SO 4002 All irthgs ersedevr Foreword 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 th
17、rough ISO technical 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 collab
18、orates closely 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 Stan
19、dards. 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 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of
20、 this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 8573-8 was prepared by Technical Committee ISO/TC 118, Compressors, pneumatic tools and pneumatic machines, Subcommittee SC 4, Quality of compressed air. ISO 8573
21、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 3: Test methods for measurement of humidity Part 4: Test methods for solid particle content Part 5: Test methods for oil vapour and organ
22、ic solvent content Part 6: Test methods for gaseous contaminant content Part 7: Test methods for viable microbiological contaminant content Part 8: Test methods for solid particle content by mass concentration Part 9: Test methods for liquid water content Part 2 is under revision. BS ISO 85738:2004
23、Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI INTENRATIONAL TSANDADR IS-3758 O8:(4002E) I SO 4002 All irthgs ersedevr 1 Compressed air Part 8: Test methods for solid particle content by mass concentration 1 Scope This part of ISO 8573 spec
24、ifies test methods for determining the solid particle mass concentration in compressed air, expressed as the mass of solid particles with maximum particle size limits. The limitations of the methods are also given. One of a series of standards aimed at harmonizing air contamination measurements, it
25、identifies sampling techniques and also gives requirements for evaluation, uncertainty considerations and reporting for the air purity parameter solid particles by mass concentration. The test methods are suitable for determining purity classes in accordance with ISO 8573-1. (Particle content based
26、on counting particles is dealt with in ISO 8573-4.) 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
27、 any amendments) applies. ISO 1219-1, Fluid power systems and components Graphic symbols and circuit diagrams Part 1: Graphic symbols ISO 3857-1, Compressors, pneumatic tools and machines Vocabulary Part 1: General ISO 5598, Fluid power systems and components Vocabulary ISO 8573-1, Compressed air Pa
28、rt 1: Contaminants and purity classes ISO 8573-2, Compressed air Part 2: Test methods for aerosol oil content ISO 8573-4, Compressed air Part 4: Test methods for solid particle content 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 3857-1, ISO 5598,
29、 ISO 8573-1 and ISO 8573-4 apply. BS ISO 85738:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-3758 O8:(4002E) 2 I SO 4002 All irthgs ersedevr 4 Units and symbols For the purposes of this part of ISO 8573, the following, including no
30、n-SI-preferred, units are used: 1 bar = 100 000 Pa; 1 l (litre) = 0,001 m3; bar(a), used for expressing absolute pressure; bar(e), used for expressing effective pressure. For the graphic symbols used in Figure 1, see ISO 1219-1. 5 Selection of methods The gravimetric method to be used is suitable fo
31、r mass concentration measurement, however, where water and oil is present in the compressed air, it shall be reduced to a minimum. A suitable method for solid particle diameter measurement may be selected from those given in Table 1. Table 1 Solid particle diameter measurement methods Type of method
32、 Maximum solid particle diameter d m Liquid water and oil contaminant mg/m3 Microscope method d W 0,5 u 20 Particle sizer method 0,1 u d u 40 Not admitted 6 Sampling techniques The sampling shall be made at or near the actual pressure and at a constant flow rate. The choice of sampling method will d
33、epend upon the actual level of contamination and the compressed air flow in the compressed air system. For sampling methods, see ISO 8573-2 and ISO 8573-4. For partial flow sampling, it should be noted that, where large particle sizes are involved, the effects of gravity could introduce sampling err
34、ors. Compressed air samples may be routed back into the main pipe or vent to the atmosphere after measurement. The value of air sample parameters (pressure, temperature, air velocity, etc.) shall be within the ranges specified by the test equipment manufacturer. Method B1 uses full flow sampling fro
35、m the main pipe flow by means of a Y-piece. BS ISO 85738:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-3758 O8:(4002E) I SO 4002 All irthgs ersedevr 3 7 Measurement methods 7.1 General The test equipment and instruments shall be in
36、 good working order. Consideration shall be given to the calibration requirements of the measurement equipment used as given in the applicable instructions. The indicated methods may be used at any point in a compressed air system using portable instruments where conditions of measurement are satisf
37、ied and available connectors and shut-off valves exist for connection to the compressed air system. In order to guarantee the required accuracy of determination of solid particle content by the gravimetric method, the total content of water and oil aerosols in the compressed air sampling shall be le
38、ss than 20 mg/m3 for sampling Method A and less than 5 mg/m3 for sampling Methods B1 and B2. Reference should be made to the measurement equipment manufacturer in respect of the applicability of the equipment. The gravimetric method deals with the separation and the weighing of solid particles that
39、are present in a compressed air sample. The influence of temperature, pressure, humidity and other contaminants of compressed air shall be taken into consideration. 7.2 Test equipment 7.2.1 General Air flow is passed through the test equipment via suitable in-line valves which have been previously c
40、hecked to ensure they do not contribute to the level of contamination already present. The general arrangement of the test equipment for the gravimetric method shall be in accordance with Figure 1. NOTE The numbers given between parentheses in the subclause titles refer to the numbering of the eleme
41、nts in Figure 1. For symbols, see ISO 1219-1. Key 1 sampling point 6 thermometer 2 shut-off valve 7 flow control valve 3 heater (if required) 8 air flowmeter 4 membrane holder 9 shut-off valve 5 pressure gauge 10 discharge outlet Figure 1 Circuit diagram of test equipment for gravimetric method BS I
42、SO 85738:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-3758 O8:(4002E) 4 I SO 4002 All irthgs ersedevr 7.2.2 Membrane holder (4) The membrane shall be manufactured from hydrophobic high-efficiency material. NOTE For a description o
43、f a typical membrane and its holder, see ISO 8573-2. 7.2.3 Flow control valve (7) In order to adjust the flow accurately, use a valve with fine adjustment. 7.2.4 Pressure gauge (5) The pressure values shall be recorded during the entire period of the test. The accuracy of measurement of the pressure
44、 shall be better than 2 % of reading. 7.2.5 Thermometer (6) The temperature values shall be recorded during the entire period of the test. The accuracy of measurement of the temperature shall be better than 1 C. 7.2.6 Air flowmeter (8) The flow rate values shall be recorded during the entire period
45、of the test. The accuracy of measurement of the flow rate shall be better than 5 %. 7.2.7 Pipes, connectors, shut-off valves (2 and 9) The requirements for pipes, connectors and shut-off valves shall be according to ISO 8573-2. 7.2.8 Heater (3) The heater may be used to decrease the level of liquid
46、water and oil contaminant content in the compressed air sample to the value specified in 7.1. Reducing the amount of liquid water and oil content by heating and/or the reduction of the pressure of the compressed air shall not have an influence on solid particle content in the compressed air sample.
47、7.3 Test procedure 7.3.1 Preparation for measuring The procedures for preparation for measuring shall be in accordance with ISO 8573-2. The weight of the dry membrane shall be determined before the sample is taken. 7.3.2 Duration of test The optimum duration of the compressed air sampling may be det
48、ermined after the first proof measurement to determine the tentative solid particle concentration. Approximate duration of test, t, in minutes can also be determined by the following inequality: maxmin p limp lim mm t cqcq (1) BS ISO 85738:2004 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27
49、04:26:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI IS-3758 O8:(4002E) I SO 4002 All irthgs ersedevr 5 where mmin is the minimum required amount of solid particle content on the membrane, in milligrams; mmax is the maximum permitted amount of solid particle content on the membrane, in milligrams; Cp lim is the assumed or maximum permitted amount of solid particle content in the compressed air, in milligram