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 BS ISO 8573-8:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 17 June 2004 BSI 17 June 2004 ISBN 0 580
2、 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 Technical Committee MCE/8, Compressors, pneumatic tools, pneumatic machines and vacuum technology, which has th
3、e 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 publications referred to in this document may be found in the BSI Catalogue under the section entitled “Interna
4、tional 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 necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Brit
5、ish 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 interpretation, or proposals for change, and keep the UK interests informed; monitor related international an
6、d 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 inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the docume
7、nt was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 8573-8:2004(E) OSI 4002INTERNATIONAL 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 des
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13、llr ithgsr esedevrBSISO85738:2004IS-3758 O8:(4002E) I SO 4002 All irthgs ersedevr iiiContents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions. 1 4 Units and symbols 2 5 Selection of methods 2 6 Sampling techniques 2 7 Measurement methods. 3 8 Evaluation of test results
14、. 6 9 Uncertainty. 6 10 Test report 7 Annex A (informative) Sample test report 8 BSISO85738:2004IS-3758 O8:(4002E) iv I SO 4002 All irthgs ersedevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of
15、 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 established has the right to be represented on that committee. International organizations, governmental and non-governmental
16、, in liaison with ISO, also take part in the work. ISO collaborates 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
17、task of technical committees is to prepare International Standards. 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. Atten
18、tion is drawn to the possibility that some of the elements of 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 mach
19、ines, 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 3: Test methods for measurement of humidity Part 4: Test methods for solid p
20、article content Part 5: Test methods for oil vapour and organic 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 liqu
21、id water content Part 2 is under revision. BSISO85738:2004INTENRATIONAL TSANDADR IS-3758 O8:(4002E)I SO 4002 All irthgs ersedevr 1Compressed air Part 8: Test methods for solid particle content by mass concentration 1 Scope This part of ISO 8573 specifies test methods for determining the solid partic
22、le 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 identifies sampling techniques and also gives requi
23、rements 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 on counting particles is dealt with in ISO 8573-4.)
24、 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 1219-1, Fluid power s
25、ystems 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 Part 1: Contaminants and purity classes ISO 8573-2, C
26、ompressed 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, ISO 8573-1 and ISO 8573-4 apply. BSISO85738:2004IS
27、-3758 O8:(4002E) 2 I SO 4002 All irthgs ersedevr4 Units and symbols For the purposes of this part of ISO 8573, the following, including non-SI-preferred, units are used: 1 bar = 100 000 Pa; 1 l (litre) = 0,001 m 3 ; bar(a), used for expressing absolute pressure; bar(e), used for expressing effective
28、 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 for 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 p
29、article diameter measurement may be selected from those given in Table 1. Table 1 Solid particle diameter measurement methods Type of method Maximum solid particle diameter d m Liquid water and oil contaminant mg/m 3Microscope method d W 0,5 u 20 Particle sizer method 0,1 u d u 40 Not admitted 6 Sam
30、pling techniques The sampling shall be made at or near the actual pressure and at a constant flow rate. The choice of sampling method will depend 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
31、partial flow sampling, it should be noted that, where large particle sizes are involved, the effects of gravity could introduce sampling errors. 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, tem
32、perature, air velocity, etc.) shall be within the ranges specified by the test equipment manufacturer. Method B1 uses full flow sampling from the main pipe flow by means of a Y-piece. BSISO85738:2004IS-3758 O8:(4002E) I SO 4002 All irthgs ersedevr 37 Measurement methods 7.1 General The test equipmen
33、t and instruments shall be in 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 conditi
34、ons of measurement are satisfied 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 compre
35、ssed air sampling shall be less than 20 mg/m 3for sampling Method A and less than 5 mg/m 3for 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 weig
36、hing of solid particles that 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
37、 which have been previously checked 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
38、to the numbering of the elements 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 equipmen
39、t for gravimetric method BSISO85738:2004IS-3758 O8:(4002E) 4 I SO 4002 All irthgs ersedevr7.2.2 Membrane holder (4) The membrane shall be manufactured from hydrophobic high-efficiency material. NOTE For a description of a typical membrane and its holder, see ISO 8573-2. 7.2.3 Flow control valve (7)
40、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 shall be better than 2 % of reading. 7.2.5 Thermometer (6) The temperature values
41、 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 of the test. The accuracy of measurement of the flow rate shall be better than 5 %
42、. 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 water and oil contaminant content in the compressed air sample to the value specif
43、ied 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. 7.3 Test procedure 7.3.1 Preparation for measuring The procedures for preparation
44、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 determined after the first proof measurement to determine the tentative solid particl
45、e concentration. Approximate duration of test, t, in minutes can also be determined by the following inequality: max min p lim p lim m m t cqcq (1) BSISO85738:2004IS-3758 O8:(4002E) I SO 4002 All irthgs ersedevr 5where m minis the minimum required amount of solid particle content on the membrane, in
46、 milligrams; m maxis the maximum permitted amount of solid particle content on the membrane, in milligrams; C p limis the assumed or maximum permitted amount of solid particle content in the compressed air, in milligrams per cubic metre; q is the compressed air discharge through the membrane, in cub
47、ic metres per minute. The mass of solid particles collected on the membrane shall be in range 1 mg u m u 5 mg on 1 cm 2of the membrane surface. 7.3.3 Measurement of solid particle mass concentration If liquid water and oil contaminants are absent in the compressed air flow, the solid particle mass c
48、oncentration for each sample is determined as a difference between masses of the test membrane before and after air sampling, divided by the total volume of air passed through the membrane. After air sampling and before weighing, the test membrane should be placed in a desiccator over a suitable des
49、iccant, e.g. silica gel, for 10 - 15 min or until the mass of membrane is stable. If there are liquid water and oil contaminants in the compressed air flow, they shall be removed after air sampling and before weighing of the test membrane. For this purpose, the test membrane shall be placed in the desiccator over sulphuric acid for 2 h. Then, the test membrane is carried in the chemical funne
