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1、JIS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association JIS B 8392-1 :20*3 Compressed air-Part I : Contaminants and purity classes ICs 71.100.20 Reference number : JIS B 8392-1 : 2003 (E) PROTECTED BY COPYRIGHT 7 s Copyright Japanese Standards Association Provided
2、 by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:10:20 MDTNo reproduction or networking permitted without license from IHS -,-,- B 8392-1 2003 (IS0 8573-1 : 2001) Foreword This translation has been made based on the original Japanese In
3、dus- trial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted by Japan Fluid Power Association (JFPA) / Japanese Stan- dards Association
4、 (JSA) with the draft being attached, based on the pro- vision of Article 12 Clause l of the Industrial Standardization Law ap- plicable to the case of revision by the provision of Article 14. Conse- quently JIS B 8392-1:2000 is replaced with this Standard. This revision has been made based on IS0 8
5、573-1:2001, Compressed air -Part i: Contaminants and purity classes for the purposes of making it easier to compare this Standard with International Standard; to prepare Japanese Industrial Standard conforming with International Standard; and to propose a draft of an International Standard which is
6、based on Japanese Industrial Standard. JIS 8 8392 consists of the following 4 parts under the general title Com- pressed air : Part i: Contaminants and purity classes Part 2: Test methods for aerosol oil content Part 3: Test methods for measurement ofhumidity Part 4 : Test methods for solid particle
7、 content. Date of Establishment: 2000-08-20 Date of Revision: 2003-03-20 Date of Public Notice in Official Gazette: Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Industrial Machinery 2003-03-20 JIS B 8392-1 : 2003, First English edition published in
8、2005-02 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. Q JSA 2005 All rights reserved. Unless otherwise specified, no part of this publ
9、ication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSA
10、Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:10:20 MDTNo reproduction or networking permitted without license from IHS -,-,- Contents Page Introduction 1 1 Scope 1 2 Normative references. 1 3 Terms and definitions 2 3.1 aerosol 2 3.2 agglomerate 2 3.3 dewpoint 2
11、 3.4 microbiological organisms 2 3.5 oil 2 3.6 particle 2 3.7 particle size 2 3.8 relative water vapour pressure, relative humidity 2 3.9 vapour 2 4 Measurement of contaminants 2 5 Standard atmosphere 3 6 Contaminants 3 6.1 General 3 6.2 Solid particles 3 6.3 Water 4 6.4 oil 4 6.5 Gaseous contaminan
12、ts 4 6.6 Microbiological organisms 5 7 Compressed air purity classes 5 7.1 Solid particle classes 5 7.2 Humidity and liquid water classes 5 . . . . . . . . . . . . 7.3 Oil classes 6 7.4 Gases 6 7.5 Microbiological organisms 6 7.6 Designation 6 . . Bibliography 7 (i) PROTECTED BY COPYRIGHT Copyright
13、Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:10:20 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 8392-1 : 2003 (IS0 8573-1 : 2001)
14、 Compressed air - Part 1: Contaminants and purity classes Introduction This Japanese Industrial Standard has been prepared based on the second edition of IS0 8573-1 Compressed air-Part i: Contaminants andpurity classes published in 2001 and Technical Corrigendum 1 without modifying the technical con
15、- tents. Portions underlined with dots are the matters not stated in the original Interna- tional Standard. 1 of particles, water and oil regardless of the source of the compressed air. Scope This part of JIS B 8392 specifies purity classes of compressed air in respect This part of JIS B 8392 identi
16、fies microbiological and gaseous contaminants. The gaseous contaminants included in this part of JIS B 8392 are carbon monoxide, carbon dioxide, sulfur dioxide, nitrogen dioxide, nitric oxide and hydrocarbons with carbon atoms in the range Ci to C5. Other contaminants are taken into consideration fo
17、r specific applica- tions, e.g. air used for breathing, medical, food and beverage pur- poses. The International Standard corresponding to this Standard is as fol- lows. In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS
18、 are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21. IS0 8573-112001, Compressed air-Part i: Contaminants and purity classes (IDT) NOTES 1 2 2 Normative references The following standards contain provisions which, through reference in this Standard, constitut
19、e provisions of this Standard. The most recent edi- tions of the standards (including amendments) indicated below shall be applied. JIS B 8391- 1 Compressed air dryers -Part 1: Specifications and testing NOTE 1 IS0 7183 Compressed air dryers-Specifications and testing is identi- Compressed air for g
20、eneral use-Part 2: Test methods for aerosol oil cal with the said standard. JIS B 8392-2 con ten t NOTE IS0 8573-2 Compressed air for general use-Part 2: Test methods for PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111
21、111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:10:20 MDTNo reproduction or networking permitted without license from IHS -,-,- aerosol oil content is identical with the said standard. JIS B 8392-3 Compressed air-Part 3: Test methods for measurement of humidity NOTE : IS0 8573-3 Compressed a
22、ir-Part 3: Test methods for measurement of humidity is identical with the said standard. JIS B 8392-4 Compressed air-Part 4 : Test methods for solidparticle content NOTE : IS0 8573-4 Compressed air-Part 4: Test methods for solid particle content is identical with the said standard. Compressed air-Pa
23、rt 5 : Test methods for oil vapour and organic solvent IS0 8573-5 con tent 3 Terms and definitions definitions given in JIS B 8391-1 and the following apply. 3.1 solid and liquid particles having negligible fall-velocity/settling-velocity 3.2 cluster by any means 3 . 3 dewpoint temperature at which
24、water vapour begins to condense 3.4 fungi or yeasts 3 . 5 oil mixture of hydrocarbons composed of 6 or more carbon atoms (Cd 3.6 particle 3.7 particle size d length of the greatest distance between two external boundaries 3.8 relative water vapour pressure, relative humidity ratio of the partial pre
25、ssure of water vapour to its saturation pressure at the same temperature 3.9 vapour gas which is at a temperature below its critical temperature and which therefore can be liquefied by isothermal compression For the purposes of this part of JIS B 8392, the terms and aerosol suspension in a gaseous m
26、edium of solid particles, liquid particles or agglomerate group of two or more particles combined, joined or formed into a microbiological organisms viable colony forming units which may be a bacteria, a small discrete mass of solid or liquid matter 4 Measurement of contaminants For the purpose of a
27、ssessing the purity class of a compressed air sample, measurements shall be made in accordance with the appropri- ate part of JIS B 8392 or IS0 8573: - Part 2 for measuring oil aerosols and oil liquid content of compressed air; - Part 3 for measuring humidity; - Part 4 for measuring solid particles;
28、 - Part 5 for measuring oil vapour and organic solvent content; Further parts of IS0 8573 are under preparation for measuring gaseous contaminant content (Part 61, for determining viable microbiological contaminant content (Part 7) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Prov
29、ided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:10:20 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 2001) B 8392-1 : 2003 (Is0 8573-1 Air temperature Air pressure Relative water vapour pressure and for
30、 measuring solid particles (Part 8) and liquid water content (Part 9). In their absence, other recognized standards shall be used for the measurement of the various contaminants, if possible, and the following rules apply: - measurements shall be based on a number of samples taken during a suitable
31、length of time; - measurements should be carried out at the actual operating pressure and tempera- ture; - the purity classes of a compressed air system should be based on the mean value of an agreed number of measurements (see note); - the purity classes are relevant only at the point of measuremen
32、t (see note). The content of particles, water and oil in compressed air varies due to sudden changes in the intake air, to the wear of components as well as to changes in flow, pressure, temperature and ambient conditions. It is not possible to measure the full flow area of a compressed air stream u
33、sing most test methods and therefore it is necessary to take samples of the air. Care should be exercised to ensure that the sample taken is representative of the compressed air pu- rity. Measurements should be carried out at the actual operating conditions as otherwise the balance between impuritie
34、s in liquid, aerosol or gaseous form will be altered. Liquid oil and free water in particular tend to cling to pipe and tube walls where they form a film or thin rivulets. NOTE 20 “c 0.1 MPa absolute O 6 Contaminants 6.1 General The three major impurities in compressed air are solid particles, water
35、 and oil. They influence each other (e.g. solid particulate agglomerates in the presence of oil or water to form larger particles, oil and water form an emulsion) and are some- times deposited or condensed (e.g. oil vapour or water vapour) inside the pipework of a compressed air system. Other contam
36、inants are also considered, including micro- biological organisms and gaseous contaminants. 6.2 Solid particles 6.2.1 General Solid particle properties are important and are characterized by den- sity, shape, size and by hardness. It is essential to eliminate the influence of water on PROTECTED BY C
37、OPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:10:20 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 B 8392-1 : 2003 (IS0 8573-1 : 2001) particle si
38、ze and number in order to obtain a correct reading. 6 . 2 . 2 Measuring parameters 6 . 2 . 2 . 1 Particle size Particle size shall be measured in accordance with recognized methods. 6 . 2 . 2 . 2 Concentration of particles shall be measured in ac- cordance with JIS B 8392-4. Mass concentration of pa
39、rticles shall be measured in ac- cordance with a recognized standard (see clause 4 ) . 6 . 2 . 2 . 3 JIS B 8392-3. Particle concentration Humidity The actual humidity level shall be measured in accordance with 6.3 Water 6 . 3 . 1 General Atmospheric air always contains water vapour. When atmospheric
40、 air is compressed the partial pressure of the water vapour increases but, owing to the in- crease in temperature caused by the compression, no water precipitates. When the air is subsequently cooled (e.g. in an intercooler of aftercooler, in the distribution pipework or during the expansion process
41、 in a pneumatic tool) water will condense to liquid, but the air will be fully saturated with water vapour. 6.3.2 Measuring parameters Humidity measurement shall be in accordance with JIS B 8392-3 and for liquid water in accordance with a recognized standard (see clause 4 ) . 6.4 Oil 6.4.1 belong to
42、 one or more of three categories: liquid, aerosol or vapour. General For the purposes of this part of JIS B 8392, oil in compressed air can When considering oil vapour content of compressed air it is important to reference the temperature as this affects the ratio of vapour to total oil content. Tes
43、ting for vapour should be carried out in conjunction with the test for aerosols and bulk liquid so the various phase concentrations may be discerned. Due to the complex organic molecules, which may be involved, the calibration procedure of the measure- ment equipment shall be clearly stated. 6.4.2 M
44、easuring parameters 6 . 4 . 2 . 1 O i l liquid, aerosol or vapour The measurement of oil aerosol and liquid shall be in accordance with JIS B 8392-2. The measurement of oil vapour shall be in accor- dance with IS0 8573-5. 6 . 4 . 2 . 2 JIS B 8392-3. Humidity The actual humidity level shall be measur
45、ed in accordance with 6 . 5 Atmospheric air contains not only those common con- taminants generally identified for treatment but also gaseous contaminants which may be present in varying amounts depending on location. Concentration of gaseous con- taminants shall be measured in accordance with a rec
46、ognized standard (see clause 4). Gaseous contaminants PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 08:10:20 MDTNo reproduction or networking permitted without lice
47、nse from IHS -,-,- 5 B 8392-1 2003 (IS0 8573-1 : 2001) Class 6.6 Microbiological organisms Microbiological organisms are generally considered to be solid contaminants, which can be present in the atmospheric air. These organisms may be introduced into the compressed air by a number of means. If the
48、microbiological organism is to be identified as a solid particle then the measurement method identified in JIS B 8392-4 is used. If the colony forming activity of bacteria, fungi or yeasts is important then this can be identified using a recognized standard (see clause 4). Maximum number of particle
49、s per m3 (see clause 5) Particle size, d um Particle size 7 Compressed air purity classes 7.1 The solid particle classes are defined in table 2. Values for classes O to 5 shall be measured in accordance with JIS B 8392-4 and those for classes 6 and 7 in accordance with IS0 8573-8. Solid particle clas