BS ISO 8573-9-2004 Compressed air - Test methods for liquid water content《压缩空气 液体水含量的试验方法》.pdf

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1、BRITISH STANDARD BS ISO 8573-9:2004 Compressed air Part 9: Test methods for liquid water content ICS 71.100.20 BS ISO 8573-9:2004 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 43961 5 National forewo

2、rd This British Standard reproduces verbatim ISO 8573-9:2004 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 the responsibility to: A l

3、ist 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 “International Standards Corresp

4、ondence 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 British Standard does not of

5、 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 and European developments

6、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 v, a blank page, pages 1 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments i

7、ssued since publication Amd. No. Date Comments Reference number ISO 8573-9:2004(E) OSI 4002INTERNATIONAL STANDARD ISO 8573-9 First edition 2004-02-01 Compressed air Part 9: Test methods for liquid water content Air comprim Partie 9: Mthodes dessai pour la dtermination de la teneur en eau liquide BSI

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13、l irthgs ersedevr iiiContents Page Foreword iv Introduction v 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. 2 8 Evaluation of test results . 8 9 Uncertainty. 9 10 Test report 9 Annex A (in

14、formative) Sample test report 11 BSISO85739:2004IS-3758 O9:(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 preparing International Standards is normally c

15、arried 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, in liaison with ISO, also take part in the wor

16、k. 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 task of technical committees is to prepare Inter

17、national 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. Attention is drawn to the possibility that some of th

18、e 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 8573-9 was prepared by Technical Committee ISO/TC 118, Compressors, pneumatic tools and pneumatic machines, Subcommittee SC 4, Quality of compressed a

19、ir. 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 particle content Part 5: Test methods for oil vap

20、our 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 liquid water content Part 2 is under revision. BSISO

21、85739:2004IS-3758 O9:(4002E) I SO 4002 All irthgs ersedevr vIntroduction Water can be present in compressed air systems in two states: liquid and vapour. Liquid water usually consists of liquid aerosol and wall flow. This part of ISO 8573 deals with liquid water content. Water vapour content is deal

22、t with in ISO 8573-3. BSISO85739:2004blank 4002:93758OSISBINTENRATIONAL TSANDADR IS-3758 O9:(4002E)I SO 4002 All irthgs ersedevr 1Compressed air Part 9: Test methods for liquid water content 1 Scope This part of ISO 8573 specifies test methods for determining the liquid water content in compressed a

23、ir, expressed as the liquid water mass concentration. 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 requirements for evaluation, uncertainty considerations and reportin

24、g for the air purity parameter liquid water. The test methods are suitable for determining the purity classes in accordance with ISO 8573-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited

25、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 ISO 3857-1, Compressors, pneumatic tools and machines Vocabulary Part 1: Gene

26、ral ISO 5598, Fluid power systems and components Vocabulary ISO 8573-1, Compressed air Part 1: Contaminants and purity classes ISO 8573-2, Compressed air Part 2: Test methods for aerosol oil content ISO 8573-3, Compressed air Part 3: Test methods for measurement of humidity 3 Terms and definitions F

27、or the purposes of this document, the terms and definitions given in ISO 3857-1, ISO 5598, ISO 8573-1, ISO 8573-2 and the following apply. 3.1 water aerosol liquid water particles in compressed air that have negligible fall velocity/settling velocity 3.2 liquid water water aerosol and wall flow in c

28、ompressed air BSISO85739:2004IS-3758 O9:(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) is used for expressing absolute pressure; bar(

29、e) is used for expressing effective pressure. For the graphic symbols used in Figure 1, diagrams are in accordance with ISO 1219-1. 5 Selection of methods The method to be selected is dependent on the mass concentration range of liquid water in compressed air. The most suitable method for the range

30、of liquid water content estimated to be present in the sample may be selected from Table 1. Table 1 Liquid water mass concentration measurement methods Type of method Liquid water concentration (c w ) g/m 3Gravimetric method c wW 0,1 Vapourization method c wu 5 6 Sampling techniques The sampling sha

31、ll be made at or near actual pressure and at a constant compressed air 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. Compressed air samples may be routed back

32、 into 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. 7 Measurement methods 7.1 General The test equipment and instruments shall be in good w

33、orking order. Consideration shall be given to the calibration requirements of the measurement equipment used as given in the applicable instructions. Pressure and temperature may also affect liquid water content measurement results. Therefore, the temperature and the pressure at the measuring point

34、should be maintained at steady state conditions. Reference should be made to the measurement equipment manufacturer as to applicability of the equipment. BSISO85739:2004IS-3758 O9:(4002E) I SO 4002 All irthgs ersedevr 37.2 Determination of liquid water content by gravimetric method 7.2.1 General Thi

35、s method identifies the collection of condensate from the sampling point, the separation of water from that condensate and the weight of liquid water present in the compressed air sample. The volume of compressed air from which the liquid water is separated shall be measured. 7.2.2 Test equipment 7.

36、2.2.1 General description The general arrangement of the test equipment for the gravimetric method shall be in accordance with Figure 1. In the case of partial flow sampling, the water separator (3) with the attendant components (12 and 13) in the drain line should be excluded. NOTE The numbers give

37、n between parentheses refer to the numbering of the elements in Figure 1. For symbols, see ISO 1219-1. 7.2.2.2 Water separator (3) The main function of the separator is partial removal of liquid water from air flow and protection of the high- efficiency filter (4) from overflow. The separator effici

38、ency of water removal from the compressed air flow shall be not less than 80 %. 7.2.2.3 High-efficiency filter (4) The high-efficiency coalescing filter for liquid water removal shall have an efficiency of W 99,9 %, rated for oil particles u 3 m. 7.2.2.4 Collecting vessels (13) Vessels with a volume

39、 of not less than 0,5 l that enable the liquid water collection to be observed during testing shall be used. 7.2.2.5 Oil/water separator (14) The liquid collected in the collecting vessels (13) shall be transferred to the oil/water separator (14). A detailed explanation of the procedure of water sep

40、aration is identified in ISO 8573-2. 7.2.2.6 Drain valves (12) Drain valves are used to drain the liquid water collected in the water separator (3), high-efficiency filter (4) and collecting vessels (13). A drain valve between the filter (4) and the collecting vessel is normally left in the open pos

41、ition; a drain valve between the collecting vessel and the oil/water separator (14) is normally left in the closed position. 7.2.2.7 Measuring columns (15) The amount of separated liquid water is measured in the measuring column graduated in millilitres or weighted in grams. The accuracy of measurem

42、ent of mass shall be better than 2 % of the reading. BSISO85739:2004IS-3758 O9:(4002E) 4 I SO 4002 All irthgs ersedevrKey 1 sampling point 6 pressure gauge 11 discharge outlet 2 shut-off valve 7 thermometer 12 drain valve 3 water separator 8 flow control valve 13 collecting vessel 4 high-efficiency

43、filter 9 air flowmeter 14 oil/water separator 5 differential pressure gauge 10 shut-off valve 15 measuring column Figure 1 Circuit diagram of test equipment for weighing method BSISO85739:2004IS-3758 O9:(4002E) I SO 4002 All irthgs ersedevr 57.2.2.8 Differential pressure gauge (5) This gauge determi

44、nes the pressure drop across the high-efficiency filter (4). The accuracy of measurement of the pressure drop shall be better than 2 %. 7.2.2.9 Pressure gauge (6) In order to determine the air sample volume, the values of pressure shall be recorded during the entire period of the test. The accuracy

45、of measurement of pressure shall be better than 2 % of full scale. 7.2.2.10 Thermometer (7) In order to determine the air sample volume, the values of temperature shall be recorded during the entire period of the test. The accuracy of measurement of temperature shall be better than 1 C. 7.2.2.11 Air

46、 flowmeter (9) In order to determine the air sample volume, the values of flow rate shall be recorded during the entire period of the test. The accuracy of measurement of flow rate shall be better than 5 %. 7.2.2.12 Flow control valve (8) In order to adjust the flow accurately, a flow control valve

47、with fine adjustment shall be used. 7.2.2.13 Pipes, connectors, shut-off valves (2,10 and 12) Pipes, connectors and shut-off valves shall be according to ISO 8573-2. 7.2.3 Test procedure The procedures for preparation for measuring the high-efficiency filter (4) stabilization and the liquid water me

48、asurement shall be carried out in accordance with ISO 8573-2. In order to obtain good test uncertainty, the air sampling shall be carried on until the appearance in the collecting vessels (13) of not less than 100 ml of total liquid water as a sum of both vessels. 7.2.4 Determination of test results

49、 It is necessary to ensure that result are stable, repeatable and presented in a form which shows that they are so. When the volume of liquid water is measured, the liquid water content in the compressed air flow, c w , in g/m 3 , is calculated using the following formula: w 1 0,016 67 60 VV c qt qt = (1) where V is the volume of liquid water collected, in millilitres;