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1、BRITISH STANDARD BS ISO 12500-1:2007 Filters for compressed air Test methods Part 1: Oil aerosols ICS 23.100.60; 71.100.20 ? Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO 12500-1:2007 This British Stan
2、dard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007 ISBN 978 0 580 53130 9 National foreword This British Standard is the UK implementation of ISO 12500-1:2007. The UK participation in its preparation was entrusted to Technical Committee MCE
3、/8, Compressors, pneumatic tools, pneumatic machines and vacuum technology. A list of organizations represented on this committee can be 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 correc
4、t application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI INTERNA
5、TIONAL STANDARD ISO 12500-1 First edition 2007-06-01 Reference number ISO 12500-1:2007(E) Filters for compressed air Test methods Part 1: Oil aerosols Filtres pour air comprim Mthodes dessai Partie 1: Arosols dhuile BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank U
6、niversity, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI ii Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iii Contents Page 1Scope 1 2Normative references 1 3Terms and definitions 2 4Units an
7、d symbols . 2 5Reference conditions 3 6Test requirements 3 7Test method 5 8Uncertainty . 6 9Test report 7 Annex A (informative) Sample test report form . 8 Bibliography . 9 BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 20
8、07, Uncontrolled Copy, (c) BSI iv 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 through ISO technical committees. Each member body int
9、erested 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 collaborates closely with the International Electrotechnic
10、al 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 Standards. Draft International Standards adopted by the
11、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 this document may be the subject of patent rights.
12、ISO shall not be held responsible for identifying any or all such patent rights. ISO 12500-1 was prepared by Technical Committee ISO/TC 118, Compressors and pneumatic tools, machines and equipment, Subcommittee SC 4, Quality of compressed air. ISO 12500 consists of the following parts, under the gen
13、eral title Filters for compressed air Test methods: Part 1: Oil aerosols Part 2: Oil vapours Part 3: Particulates BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI v Introduction Oil aerosols
14、are a typical contaminant found in compressed air streams. Coalescing filters are designed to remove oil aerosols from compressed air. The most important performance characteristics are the ability of the filter to remove oil aerosols from the air stream and the amount of pressure drop caused by the
15、 filter as compressed air flows through it when the filter element is saturated with oil. This part of ISO 12500 provides a means of comparing the performance of filters. BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007
16、, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 1 Filters for compressed air Test methods Part 1: Oil aerosols 1Scope This part of ISO 12500 specifies the test layout and test
17、 procedures required for testing coalescing filters used in compressed-air systems to determine their effectiveness in removing oil aerosols. This part of ISO 12500 provides the means to indicate performance characteristics of the pressure drop and the capability of removing oil aerosols. This part
18、of ISO 12500 defines one method of presenting filter performance as outlet oil aerosol concentration stated in milligrams per cubic metre from results obtained under standard rating parameters. 2Normative references The following referenced documents are indispensable for the application of this doc
19、ument. 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 systems and components Graphic symbols and circuit diagrams Part 1: Graphic symbols for conventional use and
20、data-processing applications ISO 2602, Statistical interpretation of test results Estimation of the mean Confidence interval ISO 2854, Statistical interpretation of data Techniques of estimation and tests relating to means and variances ISO 3649:1980, Cleaning equipment for air or other gases Vocabu
21、lary ISO 5598, Fluid power systems and components Vocabulary ISO 7000, Graphical symbols for use on equipment Index and synopsis ISO 71831), Compressed-air dryers Specifications and test methods ISO 8573-1:2001, Compressed air Part 1: Contaminants and purity classes ISO 8573-2, Compressed air Part 2
22、: Test methods for oil aerosol content ISO 14644-3:2005, Cleanrooms and associated controlled environments Part 3: Test methods 1)To be published. (Revision of ISO 7183:1986) BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00
23、2007, Uncontrolled Copy, (c) BSI 2 3Terms and definitions For the purposes of this document, the terms and definitions given in ISO 7183, ISO 5598 and the following apply. 3.1 ambient temperature temperature of the air surrounding the filter under test 3.2 coalescing action by which liquid particles
24、 in suspension unite to give particles of greater volume ISO 3649:1980, definition 13 3.3 contaminant any solid, liquid or gas that adversely affects the system 3.4 filter apparatus for separation or removal of contamination from a compressed air or gas stream 3.5 pressure drop differential pressure
25、 difference between inlet and outlet pressure of a component, measured under specified conditions 3.6 equivalent flow velocity flow at which, when the test filter is operated at a (e) test pressure, an equal velocity to that for the device would be achieved when operated at a rated pressure and flow
26、 other than the test pressure 3.7 wall flow that proportion of liquid contamination no longer suspended within the air flow of the pipe 4Units and symbols General use of SI units (Systme international dunits, see ISO 1000) as given throughout this part of ISO 12500 is recommended. However, in agreem
27、ent with accepted practice in the pneumatic field, some non-preferred SI units, accepted by ISO, are also used. NOTEbar (e) is used to indicate effective pressure above atmospheric. The graphic symbols on diagrams are in accordance with ISO 1219-1 and ISO 7000. p 700 kPa 7 bar 1 bar=100 000 Pa 1 l (
28、litre)=0,001 m3 BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 5Reference conditions The reference conditions for gas volumes shall be: a)air temperature ; b)absolute air pressure (a); c)
29、relative water vapour pressure 0. 6Test requirements 6.1Standard rating parameters The standard rating parameters are as identified in Table 1. 6.2Inlet air velocity Testing for aerosol removal shall be carried out at the flow rate which the manufacturer specifies as the maximum rated working flow f
30、or continuous operation for each particular filter model. To maintain turbulent flow and minimise aerosol settling, the minimum Reynolds number in the air stream in the inlet pipe shall be 4 000. The Reynolds number, , shall be calculated using Equation (1); (1) Table 1 Standard rating parameters Re
31、porting parameters UnitsRating conditions c Maintain within of actual gauge value Instrument accuracy at test conditions Inlet temperature20 Inlet pressurekPa bar (e)700 (7) (0,1) () Ambient temperature 20 Minimum air purityaISO 8573-1:2001, class 2 6 1d Air flow for testingm3/h rated flow of gauge
32、reading Inlet oil aerosol concentrationb c mg/m31040 of gauge reading Pressure dropPa (mbar)not applicablenot applicable of gauge reading a Minimum air purity to the inlet of the oil aerosol generator, to ensure there is no liquid water present on the inlet of the test filter. b Mineral oil lubrican
33、ts meeting the requirements of ISO 3448, Viscosity Grade 46 and which are typical of compressor oils may be used. c Selection based on the type and performance of the compressor representative of those which may be found in use d The first number represents the solid-particle classification; the sec
34、ond, the humidity classification; and the third, the total oil classification. 20 C 100 kPa 1 bar C 52 C 10 10 kPa 0,1 bar C 52 C 100 %2 % 4 % 10 % 10 % 10 % Re Re = Dv BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007,
35、Uncontrolled Copy, (c) BSI 4 where is the internal pipe diameter, expressed in metres; is the flow velocity, expressed in metres per second; is the density in kilogrames per cubic metres; is the dynamic viscosity, expressed in pascal-seconds. If a filter employs multiple elements, testing carried ou
36、t on a filter with an element at the maximum recommended flow rate for that particular element may be taken as representative of the results for a multi-element filter using the same element. 6.3Inlet air flow For the testing of filters that have their maximum flow rating quoted at a pressure other
37、than (e), the measurement for oil-aerosol removal can be made using equivalent flow velocity at rated pressure identified by the manufacturer for the filter under test. The test flow rate, , at reference conditions, expressed in cubic metres per hour, is calculated according to Equation (2): (2) whe
38、re is rated flow rate, at reference conditions, expressed in cubic metres per hour; is absolute test pressure, expressed in bar (a); is absolute rated pressure, expressed in bar (a); is the compressibility factor of air at rated pressure and , dimensionless. D v 7 bar qVe,REF qVe,REF= qVn,REF T pe p
39、n qVn,REF pe pn T20 C BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 7Test method 7.1Test equipment arrangement The circuit diagram of the test equipment is shown in Figure 1. 7.2Test cha
40、llenge concentration Set all controls of the test rig to the standard rating parameters given in Table 1. The aerosol generator is designed to provide a poly-disperse oil-aerosol distribution having an average size in the range to by particle count. The aerosol generator is designed to give a normal
41、 mean particle-size distribution of between and by particle count to disperse aerosols and the output adjusted to give the test concentration required in Table 1. Care shall be exercised to ensure that all of the challenge oil concentration delivered to the test filter is in aerosol form within the
42、range detailed above and, where necessary, provision shall be made within the aerosol generator system to prevent wall flow into the test apparatus. Key 1compressed air supply 2pressure regulator 3temperature sensing/measuring 4dew point sensing/measuring 5full-flow ball valve 6pressure sensing/meas
43、uring 7differential pressure gauge 8sample test point 9multi-turn flow control valve 10flow sensing/measuring 11silencer 12ambient temperature sensing/measuring 13aerosol generator 14pressure measuring tube 15filter under test a Details of the construction of the measuring tubes are given in ISO 718
44、3. Figure 1 Typical layout of test equipment 0,15m 0,4m 0,15m0,4m BS ISO 12500-1:2007 Licensed Copy: London South Bank University, London South Bank University, Wed Aug 08 03:55:33 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 6 7.3Test procedure At least three examples of each model shall be tested. T
45、he test shall be repeated three times on the same filter element and the results averaged. 7.4Conditioning of the filter element under test The coalescing filter element shall reach a state of equilibrium before testing is started. Conditioning the filter under test using a challenge aerosol concent
46、ration greater than that given in Table 1 is permitted; however, the preferred procedure is to set the actual characteristics and allow the filter to become conditioned by setting the generator to provide the test challenge level. Concentrations above the test challenge levels can cause excessive oi
47、l concentration in the outlet air, possibly causing misleading results when the test program is undertaken. Equilibrium is considered to have been achieved when liquid oil is observed in the bottom of the filter housing in which the filter under test is contained and the rate of change in pressure d
48、rop is less than of the measured pressure drop. The pressure drop across the test filter shall be recorded. If required, the air flow may be adjusted. 7.5Determination of oil aerosol concentration The determination of oil aerosol concentration shall be done in accordance with ISO 8573-2 or, alternat
49、ively, a suitable white-light-scattering aerosol photometer according to ISO 14644-3:2005, Annex C that is capable of sampling compressed air across the range of concentrations of interest can be used. Such an instrument will have previously been calibrated using the test oil and shall be capable of sampling the air at the test pressure. Care shall also be exercised to ensure that the compressed-air sampling method