1、 Reference number ISO 12500-4:2009(E) ISO 2009INTERNATIONAL STANDARD ISO 12500-4 First edition 2009-12-01 Filters for compressed air Methods of test Part 4: Water Filtres pour air comprim Mthodes dessai Partie 4: Eau ISO 12500-4:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In
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6、ht office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedISO 12500-4:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative r
7、eferences1 3 Terms and definitions .1 4 Units and symbols.1 5 Reference conditions 2 6 Standard rating parameter2 7 Test equipment arrangement .3 8 Test method .4 9 Results4 10 Test report4 Annex A (informative) Design guide for the water injection apparatus 6 Annex B (informative) Sample test repor
8、t form .7 Bibliography8 ISO 12500-4:2009(E) iv ISO 2009 All rights reservedForeword 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 t
9、echnical 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 work. ISO collaborates clos
10、ely 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 International Standards. Draf
11、t 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 the elements of this docum
12、ent may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 12500-4 was prepared by Technical Committee ISO/TC 118, Compressors and pneumatic tools, machines and equipment, Subcommittee SC 4, Quality of compressed air. ISO 12500 consi
13、sts of the following parts, under the general title Filters for compressed air Test methods: Part 1: Oil aerosols Part 2: Oil vapours Part 3: Particulates Part 4: Water ISO 12500-4:2009(E) ISO 2009 All rights reserved vIntroduction Water is a typical contaminant found in compressed air streams. Wate
14、r-removal devices are designed to remove water from compressed air. The most important performance characteristics are the ability of the water-removal devices to remove water from the air stream and the amount of pressure drop resulting from the process. This part of ISO 12500 provides a means of c
15、omparing the performance of water removal devices. INTERNATIONAL STANDARD ISO 12500-4:2009(E) ISO 2009 All rights reserved 1Filters for compressed air Methods of test Part 4: Water 1 Scope The test method described in this part of ISO 12500 is designed to determine the water-removal efficiency and o
16、perational pressure drop of any device designed for water removal from compressed air described as wall flow in accordance with ISO 8573-2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited a
17、pplies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1219-1:2006, Fluid power systems and components Graphic symbols and circuit diagrams Part 1: Graphic symbols for conventional use and data-processing applications ISO 5598, Fluid pow
18、er systems and components Vocabulary ISO 8573-1:2001, Compressed air Part 1: Contaminants and purity classes ISO 8573-2, Compressed air Part 2: Test methods for oil aerosol content 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 8573-1 and ISO 5598 a
19、pply. 4 Units and symbols General use of SI units (Systme international dunits; see ISO 1000) as given throughout this International Standard is recommended. However, in agreement with accepted practice in the pneumatic field, some non- preferred SI units, accepted by ISO as a duel reference, are al
20、so used. 1 bar = 100 000 Pa NOTE bar(e) is used to indicate effective pressure above atmospheric. 1 L (litre) = 0,001 m 3 . Symbols used are generally in accordance with ISO 1219-1. ISO 12500-4:2009(E) 2 ISO 2009 All rights reserved5 Reference conditions The reference conditions for gas volumes shal
21、l be as follows: air temperature 20 C; absolute air pressure 100 kPa (1 bar ) (a); relative water vapour pressure 0. 6 Standard rating parameter The standard rating parameters are as given in Table 1. Table 1 Standard rating parameters Reporting parameters Units SI (USC) Rating conditions Maintain w
22、ithin actual gauge value Instrument accuracy Inlet temperature C 20 5 C 2 C Inlet pressure kPa (bar) (e) 700 (7) 10 kPa (0,1 bar) 10k Pa (0,1 bar) Injected water per air flow ml/min per L/s2 0,2 ml/min per L/s Not applicable Ambient temperature C 20 5 C 2 C Air flow for testing L/s 25 %, 50 %, 75 %
23、100 % 125 % of rated flow 2% 4 % of gauge reading Pressure drop Pa (mbar) Not applicable Not applicable 10 % of gauge reading Minimum compressed air purity 3 6 3; see ISO 8573-1:2001 NOTE The reference conditions are as given in Clause 5. The preferred test pressure is 700 kPa (7 bar)(e). Where the
24、manufacturers maximum pressure rating is higher than 700 kPa (7 bar)(e), use 700 kPa (7 bar)(e) as the test pressure and recalculate the flow as the test flow, q test , expressed in litres per second, for the test conditions given in Table 1 according to Equation (1); test test pr rated rated 100 10
25、0 p qZq p + = + (1) where Z pris the compressibility factor of air at rated pressure and 20 C; q ratedis the rated flow at the manufacturers rated pressure, expressed in litres per second; p testis test pressure, expressed in kPa (e); p ratedis the manufacturers rated pressure, expressed in kPa (e).
26、 ISO 12500-4:2009(E) ISO 2009 All rights reserved 3Where there is insufficient flow capacity to satisfy the flow rating at standard pressure, the test pressure can be reduced using Equation (1) until the test flow is within the available flow capacity. If the rated flow is not specified, it shall be
27、 taken from Table 2. Table 2 Test Flow at rated conditions Port size 1 / 8 3 / 8 1 1 1 2 Supply pressure kPa (bar) Flow rate, L/s 700 (7,0) 2,7 6,3 13,9 25,8 38,7 72 147 223 431 7 Test equipment arrangement Assemble the device being tested as shown in Figure 1. Key 1 2 3 4 5 6 7 8a 8b compressed air
28、 source afull-flow ball valve water injection apparatus b (see Annex A) pressure reducing valve btemp sensing/measuring pressure sensing/measuring pressure differential sensing/measuring upstream pressure measuring tube cdownstream pressure measuring tube c9 10 11 12 13 14 15 16 water-removal device
29、 under test downstream water separator (optional) high-efficiency coalescing filter (recommended) multi-turn flow control valve flow sensing/measuring silencer ambient temperature-sensing/measuring shut-off valve aIt can be necessary for the compressed air supply pressure at “1” to exceed the test p
30、ressure and be capable of delivering the required over-pressure to the water reservoir in “3”. If the test pressure is 700 kPa (7 bar) (e), then typically a 1 000 kPa (10 bar) (e) supply is adequate. bPressure regulation is required at “4” and in “3” to ensure stability of the supply pressure, thus
31、preventing variation in the delivered water flow rate. cDetails of the construction of the measuring tubes are given in ISO 7183:2007, Annex D. Figure 1 Typical test arrangement ISO 12500-4:2009(E) 4 ISO 2009 All rights reservedMeans other than that shown in Figure 1 of introducing the water can als
32、o be used, for example via a dosing pump; the only consideration is that water is not converted into aerosol form in the process of injection. The amount of water collected shall be measured directly by mass. System pressure and flow control is achieved by the use of a flow-control valve, which may
33、be positioned upstream or downstream of the flow- meter. 8 Test method The following method shall be used to perform the test. a) Assemble the test apparatus as shown in Figure 1. b) Establish steady-state air flow conditions at the test pressure of interest. c) Introduce the water at a flow rate of
34、 2 mL/min of water per litre per second of air flow. d) The test period is at least 10 min. e) The amount of collected water is determined by direct reading of mass. f) Perform the measurements at flow conditions of 25 %, 50 %, 75 %, 100 % and 125 % of rated flow for the device at the test pressure
35、of interest. g) Three tests shall be performed at each flow rate. 9 Results Percentage water removal efficiency, w H 2 O , expressed as a percentage mass fraction, is calculated as given in Equation (2): 2 D HO I 100 m w m = (2) where m Dis the mass of water separated by the device under test, expre
36、ssed in grams; m Iis the mass of water injected, expressed in grams. Express the results as an average of the three measurements. 10 Test report 10.1 Statement Performance data shall be stated at reference conditions and as a minimum shall include the data in Table 1. The results shall include those
37、 obtained under test conditions. ISO 12500-4:2009(E) ISO 2009 All rights reserved 510.2 Technical data Technical data presentation shall include at least the following: statement that the data were obtained during testing in accordance with ISO 12500-4; model number of separator device; mean value o
38、f the water-removal efficiency at each flow rate tested; pressure drop, p, at each flow rate tested. A sample test report form is found in Annex B. ISO 12500-4:2009(E) 6 ISO 2009 All rights reservedAnnex A (informative) Design guide for the water injection apparatus The equipment includes a pressure
39、 vessel with sufficient water volume to supply water for the duration of the test. High pressure applied to the head space above the water in the receiver causes water to flow out of the base or via the use of a dip tube from below the water surface to the flow control valve and flow meter. Key 1 pr
40、essure-reducing valve 2 pressure sensing/measuring 3 water reservoir 4 water injection outlet 5 alternative water injection outlet 6 multi turn flow control valve 7 flow sensing/measuring aFrom un-regulated supply. bThe water reservoir is placed on a mass balance so that the amount of injected water
41、 can be determined. cEither connection point may be employed but only one should be used. dTo water-removal device under test. Figure A.1 Typical water injection apparatus (detail of key item 3, Figure 1) ISO 12500-4:2009(E) ISO 2009 All rights reserved 7Annex B (informative) Sample test report form
42、 (Click here to access an electronic interactive version of this form) Sample test report form Test date Test facility Location Contact Product tested Manufacturer Separator housing model number Separator element model number Rated flow/rated pressure Standard rating parameters and results summary R
43、esult at Reported parameter Unit Rated condition 25 % of rated flow 50 % of rated flow 75 % of rated flow 100 % of rated flow 125 % of rated flow Air flow (reference conditions) L/s Inlet test pressure kPa (bar) (e) Inlet temperature C Ambient temperature C Pressure drop Pa (mbar) N/A Water removal
44、efficiency result “a” % N/A Water removal efficiency result “b” % N/A Water removal efficiency result “c” % N/A Average water removal efficiency % N/A Notes: Tested by: Signature (tester): Date: Witness (manufacturer or other): Date: ISO 12500-4:2009(E) 8 ISO 2009 All rights reservedBibliography 1 ISO 1000, SI units and recommendations for the use of their multiples and of certain other units 2 ISO 7183:2007, Compressed-air dryers Specifications and testing ISO 12500-4:2009(E) ICS 23.100.60 Price based on 8 pages ISO 2009 All rights reserved
