BS ISO 7183-2008 en_2108 Compressed-air dryers Specifications and testing《压缩空气干燥机.规范和测试》.pdf

1、BRITISH STANDARD BS ISO 7183:2007 Compressed-air dryers Specifications and testing ICS 23.140 BS ISO 7183:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2008 BSI 2008 ISBN 978 0 580 53867 4 National foreword This British Sta

2、ndard is the UK implementation of ISO 7183:2007. It supersedes BS 6754:1986 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MCE/8, Compressors, pneumatic tools, pneumatic machines and vacuum technology. A list of organizations represented on this comm

3、ittee 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 correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issue

4、d since publication Date Comments Reference number ISO 7183:2007(E)INTERNATIONAL STANDARD ISO 7183 Second edition 2007-12-15 Compressed-air dryers Specifications and testing Scheurs air comprim Spcifications et essais BS ISO 7183:2007ii iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Norm

5、ative references . 2 3 Terms and definitions. 2 4 Symbols . 4 4.1 Figure symbols . 4 4.2 Symbols and units 4 4.3 Subscripts . 5 5 Reference conditions . 5 6 Standard rating parameters. 5 7 Performance tests. 6 7.1 Key performance parameters 6 7.2 Pressure dew point, flow rate and outlet temperature

6、6 7.3 Differential pressure drop 8 7.4 Power consumption 8 7.5 System air loss 9 7.6 Dealing with in-cycle variations 12 7.7 Noise 13 7.8 Tests for energy saving devices . 13 7.9 Instrument accuracy. 13 8 Uncertainties . 14 9 Test report . 14 9.1 Statement. 14 9.2 Technical data . 15 Annex A (inform

7、ative) Types of compressed-air dryers 16 Annex B (informative) Report form for dryer performance 17 Annex C (normative) Noise measurement. 18 Annex D (informative) Pressure-measuring tubes 19 Bibliography . 21 BS ISO 7183:2007iv Foreword ISO (the International Organization for Standardization) is a

8、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 established has the right to be represented

9、 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 standardization. International Standards are draft

10、ed 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 technical committees are circulated to the member bodies for voting. Publication as an International Stan

11、dard 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. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7183 was prepared by

12、 Technical Committee ISO/TC 118, Compressors and pneumatic tools, machines and equipment, Subcommittee SC 4, Quality of compressed air. This second edition of ISO 7183 revises and replaces the first edition (ISO 7183:1986), together with ISO 7183-2:1996, which have been technically revised. BS ISO 7

13、183:2007 v Introduction The scope has been expanded to cover most current types of dryers but also to allow the use of this International Standard and its test methods for any emerging technologies. Any new technologies can then be incorporated at a later revision. Exclusions to this International S

14、tandard are generally identified by reference to the definition of a dryer. Specific exclusions have been identified, however, for absorption dryers and dryer processes involving “over- compression” as the means of removing water from compressed air. The process of over-compression employs the princ

15、iple that water can be removed by compressing the air to a pressure higher than the intended working pressure thereby forcing out the water from the compressed air and then subsequently expanding the air back to the working pressure. Absorption dryers are now considered to be of minor importance as

16、a drying technique and are, therefore, not considered in this International Standard. BS ISO 7183:2007blank 1 Compressed-air dryers Specifications and testing 1 Scope This International Standard specifies the performance data that are necessary to state and applicable test methods for different type

17、s of compressed air dryers. It is applicable to compressed air dryers working with an effective (gauge) pressure of more than 50 kPa (0,5 bar), but less than or equal to 1 600 kPa (16 bar) and include the following: adsorption dryers; membrane dryers; refrigeration dryers (including drying by coolin

18、g); or a combination of these. NOTE A description of the principles of operation of the dryers within the Scope of this International Standard is given in Annex A. This International Standard identifies test methods for measuring dryer parameters that include the following: pressure dew point; flow

19、rate; pressure drop; compressed-air loss; power consumption; noise emission. This International Standard also provides partial-load tests for determining the performance of energy saving devices or measures. The mounting, operating and loading conditions of dryers for the measurement of noise are gi

20、ven in Annex C. This International Standard is not applicable to the following types of dryers or drying processes: absorption dryers; drying by over-compression; integral dryers. BS ISO 7183:20072 2 Normative references The following referenced documents are indispensable for the application of thi

21、s International Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 261, ISO general purpose metric screw threads General plan ISO 228-1, Pipe threads where pressure-tight joints

22、 are not made on the threads Part 1: Dimensions, tolerances and designation ISO 1179 (all parts), Connections for general use and fluid power Ports and stud ends with ISO 228-1 threads with elastomeric or metal-to-metal sealing ISO 1219-1, Fluid power systems and components Graphic symbols and circu

23、it diagrams Part 1: Graphic symbols for conventional use and 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 IS

24、O 3744, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engineering method for an essentially free field over a reflecting plane 1)ISO 8573-1:2001, Compressed air Part 1: Contaminants and purity classes ISO 8573-3, Compressed air Part 3: Te

25、st methods for measurement of humidity ISO 9614-2, Acoustics Determination of sound power levels of noise sources using sound intensity Part 2: Measurement by scanning 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 absorption chemical proces

26、s of attracting one substance into the mass of another, so that the absorbed substance combines with the absorbent 3.2 actual vapour pressure partial pressure exerted by the water vapour under the actual temperature condition of the environment 3.3 adsorption physical process in which the molecules

27、of a gas or a vapour adhere to the surface of a solid 3.4 ambient area surrounding the dryer under test 1) To be published. Revision of ISO 3744:1994 BS ISO 7183:2007 3 3.5 integral equipment which is either physically integrated and/or functionally interlinked with the compressor NOTE 1 Interlinkin

28、g can be in terms of energy exchange, controls or sharing of other components. NOTE 2 Typically, some of the performance characteristics, such as energy consumption or pressure drop, deviate substantially from those of free-standing air-treatment equipment. 3.6 desiccant adsorbent substance with the

29、 ability to retain water without change of state EXAMPLES Silica gel, activated alumina or molecular sieves. NOTE The term excludes deliquescent substances. 3.7 dew point temperature at which the vapour pressure of the vapour in a humid gas is equal to the saturation vapour pressure over the pure li

30、quid and at which condensate forms as a liquid on cooling the gas 3.7.1 pressure dew point pdp dew point measured at the actual pressure 3.8 dryer device which lowers absolute moisture content of compressed air by reducing water vapour content such that the exit relative humidity is lower than 100 %

31、 NOTE “Separating” devices that remove only bulk water, such as a cyclone separator, are not dryers. 3.9 peak point at which the measured parameter takes its highest, instantaneous value 3.10 permeate compressed air and water vapour that diffuses through a membrane NOTE The greater the selectivity o

32、f the membrane for moisture, the lower the permeate loss. 3.11 purge air flow volume-flow of compressed air entering the dryer minus the compressed air leaving the dryer during regeneration cycle NOTE 1 Typically, purge air is expanded to atmospheric pressure. NOTE 2 For membrane dryers, purge air f

33、low is the sum of “sweep-gas” plus permeate. 3.12 regeneration process of preparation of drying media to enable it to enter a new period of operation BS ISO 7183:20074 3.13 relative humidity ratio of the actual vapour pressure to the saturation vapour pressure over a plane liquid water surface at th

34、e same temperature 3.14 saturation vapour pressure partial pressure of water vapour that is in neutral equilibrium with a plane surface of pure, condensed-phase water or ice at a given temperature 3.15 sweep gas compressed air used in a membrane dryer to carry away moisture from the region outside t

35、he membrane 3.16 stabilization period time taken to reach a steady state condition of an average value 3.17 test time time taken after the stabilization period to record dryer performance 4 Symbols 4.1 Figure symbols The symbols used in Figures 1 to 3 are in accordance with ISO 1219-1. 4.2 Symbols a

36、nd units Symbol Term SI unit Other practical units d actual internal diameter of the tube millimetres l thread length millimetres m mass kilogram gram, milligram P power watt megawatt, kilowatt p pressure kilopascal bar q flow rate cubic metres per second cubic metres per hour cubic metres per minut

37、e litres per second L latent heat joules megajoules, kilojoules n number (dimensionless) t time second minute, hour, day V volume cubic metre cubic decimetre, cubic centimetre, cubic millimetre W work joule megajoule, kilojoule, kilowatt-hour X average of a series of measured values, x iof a paramet

38、er BS ISO 7183:2007 5 4.3 Subscripts Subscript Term AL air loss Av average BL blow-down loss sum sum DC dryer cycle i interval number PF purge flow PL purge air loss E electrical energy v vessel ref reference regn regeneration S steam energy s system TOT total 5 Reference conditions Reference condit

39、ions for volume statements shall be as given in Table 1. Table 1 Reference conditions air temperature 20 C absolute air pressure 100 kPa 1 bar (a) relative water vapour pressure 0 NOTE Bar(e) is used to indicate effective pressure above atmospheric. 6 Standard rating parameters Standard rating param

40、eters are necessary in defining the performance of an air dryer and in comparing one dryer with another. The standard rating parameters are given in Table 2. The standard rating parameters are assumed to be 100 % rated flow operating at 24 hours per day and seven days per week. Table 2 Standard rati

41、ng parameters ValueaQuantity Unit Option A1c Option A2cOption B Toleranceb Inlet temperature C 35 38 45 2 Inlet pressure kPa gauge bar(e) 700 (7) 700 (7) 700 (7) 14 (0,14) Inlet relative humidity % 100 100 100 0 5 Cooling air inlet temperature (where applicable) C 25 38 35 3 Cooling water inlet temp

42、erature (where applicable) C 25 29 25 3 Ambient air temperature C 25 38 35 3 Flow of dryer inlet % of rated flow 100 100 100 3 aMaintain within actual gauge value. bThe choice between options A and B is influenced by the intended geographical location of the equipment. cOption A1 applies to a temper

43、ate climate zone and Option A2 applies to a sub-tropical zone. BS ISO 7183:20076 7 Performance tests 7.1 Key performance parameters Data for the following key performance parameters are required for all compressed air dryers when stating or rating product performance and for making comparisons of al

44、ternative dryers: pressure dew point; flow rate; pressure drop; power consumption; system air loss; outlet temperature; noise emission. Measurement of the inlet pressure and temperature should be done at the dryer inlet in order to avoid errors caused by cooling or pressure drop between the measurem

45、ent point and inlet whilst operating at full rated conditions. It is the responsibility of the manufacturer to supply the required data in Annex B. For all performance tests, the inlet air purity should be in accordance with ISO 8573-1:2001, class 4, for oil and class 4 for particles and the humidit

46、y shall be in accordance with Table 2 of this International Standard. If the dryer under test requires pre-filtration to operate reliably with this inlet air purity then these filters shall be included in all tests. 7.2 Pressure dew point, flow rate and outlet temperature Measurement of the pressure

47、 dew point should be done at the stated rated flow of the dryer using the standard rating parameters selected from Table 2. Measurement of the pressure dew point of the outlet air shall be in accordance with ISO 8573-3. Discharge temperature should also be measured. Test equipment should be arranged

48、 as shown in Figure 1 however the arrangement may vary depending on the type of dryer being tested. BS ISO 7183:2007 7Key 1 conditioned compressed air supply 10 flow sensing/measuring 2 shut-off valve 11 silencer 3 inlet pressure sensing/measuring 12 ambient relative humidity sensing/measuring 4 inl

49、et temperature sensing/measuring 13 ambient temperature sensing/measuring 5 inlet moisture content meter 14 inlet pressure measuring tube 6 dryer under test 15 outlet pressure measuring tube 7 pressure dew point sensing/measuring 16 cooling water inlet temperature sensing/measuring (if applicable) 8 outlet temperature sensing/measuring 17 cooling air inlet temperature sensing