1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationIndustrial-process control valvesPart 8-2: Noise considerations Laboratory measurement of noise generated by hydrodynamic flow through control valvesBS EN 60534-8-2:2011National
2、forewordThis British Standard is the UK implementation of EN 60534-8-2:2011. It is identical to IEC 60534-8-2:2011. It supersedes BS EN 60534-8-2:1993, which will be withdrawn on 16 November 2014.The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measurement and con
3、trol, to Subcommittee GEL/65/2, Elements of systems.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 correct application. The Britis
4、h Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 76471 4 ICS 17.140.20; 23.060.40; 25.040.40 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Stand-ards Policy and Strateg
5、y Committee on 31 August 2012.Amendments issued since publicationDate Text affectedBRITISH STANDARDBS EN 60534-8-2:2011EUROPEAN STANDARD EN 60534-8-2 NORME EUROPENNE EUROPISCHE NORM December 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrote
6、chnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60534-8-2:2011 E ICS 17.140.20; 23.060.40; 25.040.40 Supersedes E
7、N 60534-8-2:1993English version Industrial-process control valves - Part 8-2: Noise considerations - Laboratory measurement of noise generated by hydrodynamic flow through control valves (IEC 60534-8-2:2011) Vannes de rgulation des processus industriels - Partie 8-2: Considrations sur le bruit - Mes
8、ure en laboratoire du bruit cr par un coulement hydrodynamique dans une vanne de rgulation (CEI 60534-8-2:2011) Stellventile fr die Prozeregelung - Teil 8-2: Geruschemission - Laboratoriumsmessungen von Geruschen bei flssigkeitsdurchstrmten Stellventilen (IEC 60534-8-2:2011) This European Standard w
9、as approved by CENELEC on 2011-11-16. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning su
10、ch national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member int
11、o its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hung
12、ary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 60534-8-2:2011EN 60534-8-2:2011 - 2 - Foreword The text of document 65B/801/FDIS, future edition 2 of I
13、EC 60534-8-2, prepared by SC 65B, “Devices b) decrease the pressure ratio xFin such a way that there is a transition from cavitating to non-cavitating flow and measure Lpas a function of frequency for each value of xFused; c) from the data obtained in b), determine the approximate frequency which gi
14、ves the maximum Lpresponse. This is the peak frequency; d) using a sound level meter with an octave band filter that includes the peak frequency, measure the Lpas xFis decreased. The range of xFshall be sufficient to establish the curves in both the cavitating and non-cavitating regions; e) in both
15、the cavitating and non-cavitating regions, fit a straight line through the data points. The intersection of the straight lines shall determine the value of xFz. See point A in Figure 5; f) repeat the procedure for the other relative flow coefficients given in Clause 8. 8.3.2 A-weighted method This m
16、ethod of determining xFzrequires the measurement of the overall sound pressure level (LpA) using the A-weighted method. The procedure is as follows (refer to Figure 6): a) at a given travel (corresponding to one of the relative flow coefficients given in Clause 8), the LpAversus xFcurve as shown by
17、the dashed line shall be determined. Decrease the pressure ratio xFin such a way that there is a transition from cavitating to non-cavitating flow and measure LpAfor each value of xFused; b) from the above curve, xF3and xF6, which are the approximate values at which the LpAcurve changes slope, shall
18、 be determined; c) the ranges xFIand xFIIshall each be divided into three equal parts (designated as “a“ and “b“, respectively); d) at each of the values xF6through xF1, the A-weighted overall sound pressure level shall be measured. This procedure shall be repeated twice so that there are three seri
19、es of measurements; e) for each value of xF, the arithmetic average, pAL , of the three LpAvalues shall be calculated and the points plotted; BS EN 60534-8-2:2011 14 60534-8-2 IEC:2011 f) using the values of pAL at xF1through xF6, the curves designated as lines 1 and 2 shall be determined by linear
20、regression; g) the point at which lines 1 and 2 intersect shall be determined. The value of xFat this point is xFz; h) repeat the procedure for the other relative flow coefficients given in Clause 8. T P P PC F TC 9b 9 14 11 12 15 10 13 8 1 2 3 4 4b 5 6 5 7 IEC 2131/11 NOTES System components 1 See
21、Figure 2a or 2b for placement of item 8 (acoustic environment) and item 10 (microphone) 2 Items 8, 12 and 15 are optional 1 = pump 2 = flow measuring device 3 = upstream throttling valve 4 = temperature measuring device 4b = upstream in-line silencer (if necessary) 5 = pressure measuring device 6 =
22、test specimen 7 = test section piping 8 = acoustic environment (test chamber) (Notes 1 and 2) 9 = downstream throttling valve 9b = downstream in-line silencer (if necessary) 10 = sound level sensor (Note 1) 11 = water tank 12 = temperature controlling device (Note 2) 13 = vessel with air cushion to
23、increase static pressure, if necessary 14 = exhaust valve 15 = pressure controller (Note 2) Figure 1a Control valve closed loop noise test System components BS EN 60534-8-2:201160534-8-2 IEC:2011 15 4 T P P PC F 4b 3 5 5 6 7 10 8 2 13 1 15 9b 9 IEC 2132/11 NOTES System components 1 See Figure 2a or
24、2b for placement of item 8 (acoustic environment) and item 10 (microphone) 2 Items 8, 12 and 15 are optional 1 = pump 2 = flow measuring device 3 = upstream throttling valve 4 = temperature measuring device 4b = upstream in-line silencer (if necessary) 5 = pressure measuring device 6 = test specimen
25、 7 = test section piping 8 = acoustic environment (test chamber) (Notes 1 and 2) 9 = downstream throttling valve 9b = downstream in-line silencer (if necessary) 10 = sound level sensor (Note 1) 11 = water tank 13 = vessel with air cushion to increase static pressure, if necessary 15 = pressure contr
26、oller (Note 2) Figure 1b Control valve open loop noise test System components Figure 1 System components for control valve closed loop and open loop noise test BS EN 60534-8-2:2011 16 60534-8-2 IEC:2011 T 2 8 2 m Note 4 1,0 m 1,0 m Flow 10 1,0 m (Note2) Seal between chamber and pipe at both ends Sea
27、ls shall not damp pipe vibrations to extent that noise measurements are affected P 2 5 4 7 0,5 m According to IEC 60534-2-3 6 IEC 2133/11 NOTES System components 1 D = nominal pipe diameter of outlet pipe, in mm 4 temperature measuring device 2 The sound level sensor shall be located at a distance o
28、f 1 m from the outer surface to the pipe and should be no closer than 0,5 m to the nearest chamber surface. 5 pressure measuring device 3 The test section piping inside the test chamber should be continuous with no flanges, circumferential joints, or other pipewall reinforcements. 6 test specimen 4
29、For specimens 150 mm (6 in) and smaller, 1,0 m minimum and 3,0 m maximum. Above 150 mm size, 6 D minimum and 20 D maximum should be held (see Clause 6 for further clarification). 7 test section piping (Note 3) 8 acoustic environment (test chamber) 10 sound level sensor (Note 2) Figure 2a Test arrang
30、ement with test specimen outside acoustic environment BS EN 60534-8-2:201160534-8-2 IEC:2011 17 T 2 6 Note 4 1,0 m 0,5 m (Note2) 1,0 m (Note2) Flow 10 According to IEC 60534-2-3 8 7 0,5 m 5 P 2 4 Seal between chamber and pipe at both ends Seals shall not damp pipe vibrations to extent that noise mea
31、surements are affected IEC 2134/11 NOTES System components 1 D = nominal pipe diameter of outlet pipe, in mm 4 temperature measuring device 2 The sound level sensor should be located at a distance of 1 m from the outer surface of the pipe and shall be no closer than 0,5 m to the nearest chamber surf
32、ace. 5 pressure measuring device 3 The test section piping inside the test chamber should be continuous with no flanges, circumferential joints, or other pipewall reinforcements. 6 test specimen 4 For specimens 150 mm (6 in) and smaller, 1,0 m minimum and 3,0 m maximum. Above 150 mm size, 6 D minimu
33、m and 20 D maximum should be held (see Clause 6 for further clarification). 7 test section piping (Note 3) 8 acoustic environment (test chamber) 10 sound level sensor (Note 2) Figure 2b Alternative test arrangement with test specimen inside acoustic environment Figure 2 Test arrangements with specim
34、en outside and (alternatively) inside acoustic environment BS EN 60534-8-2:2011 18 60534-8-2 IEC:2011 0 Relative flow coefficient CharacteristicpressureratioxFz0,25 0,5 0,75 1,00 IEC 2135/11 Figure 3 Typical curve for characteristic pressure ratio xFz Surface finish Ra IEC 2136/11 Dimensions in mill
35、imetres Figure 4 Reference test orifice plate (see 8.2.1) BS EN 60534-8-2:201160534-8-2 IEC:2011 19 A Soundpressurelevel(dB)Pressure ratio xFxFzIEC 2137/11 Figure 5 Determination of xFzby peak frequency method (see 8.3.1) BS EN 60534-8-2:2011 20 60534-8-2 IEC:2011 Line 1: from xF1, pA1L Line 2: from
36、 xF4, pA4LxF2, pA2L xF5, pA5LxF3, pA3L xF6, pA6LDetermined by linear regression LpAdB (A) LpA6LpA5LpA4LpA3LpA2LpA1Line 1 Line 2 xFzxF1xF2xF3xF4xF5xF6xFa a a b b b xFIxFIIFirst measured LpAversus xFcurve a = xFI3 b = xFII3 a = xFI3 b = xFII3 LpAArithemetic average of three measured values IEC 2138/11
37、 Figure 6 Determination of xFzby measuring the overall LpA, dB(A), at a constant valve travel BS EN 60534-8-2:201160534-8-2 IEC:2011 21 Uneveness Sound level sensor Pipe behind specimen Recommended mounting position h h IEC 2139/11 Figure 7 Mounting position of the sound level meter in the pipe for
38、h 0,5 mm If it is not possible to keep h, as shown on Figure 7, less than 0,5 mm, the mismatch shall be compensated either by means of a filling compound in a flat angle 8 between sound level meter and pipe wall or by special shaping of the inner pipe wall. BS EN 60534-8-2:2011 22 60534-8-2 IEC:2011
39、 Bibliography ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances, and designation ISO 65:1981, Carbon steel tubes suitable for screwing in accordance with ISO 7-1 ISO 4200: 1991, Plain end steel tubes, welded and seamless General Tables of d
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