IEC 60534-8-2-2011 Industrial-process control valves - Part 8-2 Noise considerations - Laboratory measurement of noise generated by hydrodynamic flow through co.pdf

1、 IEC 60534-8-2 Edition 2.0 2011-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-process control valves Part 8-2: Noise considerations Laboratory measurement of noise generated by hydrodynamic flow through control valves Vannes de rgulation des processus industriels Partie 8-2: Considration

2、s sur le bruit Mesure en laboratoire du bruit cr par un coulement hydrodynamique dans une vanne de rgulation IEC60534-8-2:2011 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduce

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17、process control valves Part 8-2: Noise considerations Laboratory measurement of noise generated by hydrodynamic flow through control valves Vannes de rgulation des processus industriels Partie 8-2: Considrations sur le bruit Mesure en laboratoire du bruit cr par un coulement hydrodynamique dans une

18、vanne de rgulation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE S ICS 17.140.20; 23.060.40; 25.040.40 PRICE CODE CODE PRIX ISBN 978-2-88912-709-2 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechniq

19、ue Internationale 2 60534-8-2 IEC:2011 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 7 4 Symbols . 7 5 General test criteria 7 5.1 General . 7 5.2 Pressure regulating devices 8 5.3 Test specimen insulation . 8 5.4 Test section piping 8 5.5 Pressure taps 8 5.6

20、 Acoustic environment 8 5.7 Instrumentation . 8 6 External sound pressure measurement . 9 6.1 General . 9 6.2 Instrumentation for noise measurement . 9 6.3 Test data accuracy 9 6.4 Test data . 9 7 Internal sound pressure measurement 10 7.1 Test system . 10 7.2 Instrumentation for noise measurement .

21、 10 7.3 Test fluid . 10 7.4 Background noise 11 7.5 Sound level sensor position . 11 7.6 Test data accuracy 11 7.7 Test data . 11 7.8 Accuracy . 12 7.9 Data evaluation . 12 8 Determination of the characteristic pressure ratio xFz12 8.1 General . 12 8.2 Test procedures 12 8.2.1 Test fluid . 12 8.2.2

22、Test conditions for determination of xFz13 8.3 Determination of xFz. 13 8.3.1 Peak frequency method . 13 8.3.2 A-weighted method 13 Bibliography 22 Figure 1 System components for control valve closed loop and open loop noise test . 15 Figure 2 Test arrangements with specimen outside and (alternative

23、ly) inside acoustic environment 17 Figure 3 Typical curve for characteristic pressure ratio xFz18 Figure 4 Reference test orifice plate (see 8.2.1) . 18 Figure 5 Determination of xFzby peak frequency method (see 8.3.1) . 19 60534-8-2 IEC:2011 3 Figure 6 Determination of xFzby measuring the overall L

24、pA, dB(A), at a constant valve travel . 20 Figure 7 Mounting position of the sound level meter in the pipe for h 0,1 is recommended. The following data shall be recorded: 1) Absolute upstream pressure kPa or bar 2) Pressure differential and/or downstream pressure kPa or bar 3) Upstream fluid tempera

25、ture K 4) Downstream fluid temperature K 5) Flow rate m3/h (see note), kg/s 6) Relative travel Dimensionless 7) Acoustic data: The unweighted sound pressure levels Lpi, measured at 1/3 octave bands, in the octave band range 63 Hz to 16 000 Hz dB 8) Description of the test specimen, including at leas

26、t the following a) Nominal size of valve a) Description of fittings b) Description of flow direction c) Rated flow coefficient C (Kvor Cv) d) Rated travel/opening angle Various (see IEC 60534-1) mm/ 9) Description of the test facility including: a) Piping and instrumentation schematic b) Nominal pip

27、e size and wall thickness c) Pipe material d) Dimensional sketch of test facility 10) Description of test fluid, including one of the following: a) Absolute vapour pressure b) Density kPa or bar kg/m311) Description of instruments 12) Flow coefficient C (Kvor Cv) at the test travel Various (see IEC

28、60534-1) 13) Pressure recovery factor of a control valve without attached fittings at choked flow, FL Dimensionless 14) Pressure recovery factor of a control valve with attached fittings at choked flow, FLP Dimensionless 15) Piping geometry factor, FpDimensionless 16) Any deviation from this standar

29、d 12 60534-8-2 IEC:2011 7.8 Accuracy The overall accuracy of this method is limited to 3 dB. 7.9 Data evaluation The data shall be evaluated in accordance with the IEC 60534-8-4. The xFzfactor can be determined alternatively based on the procedure as described in Clause 8 by using the internal sound

30、 pressure level Lpiinstead of the external sound pressure level. 8 Determination of the characteristic pressure ratio xFz8.1 General The pressure ratio xFis given as follows: v1Fpppx= When xFis increased sufficiently, there is a transition from non-cavitating to cavitating flow. The pressure differe

31、ntial where the sound pressure level begins to increase due to cavitation during this transition is pk. The corresponding ratio is the characteristic pressure ratio xFzand is defined as follows: 125,021v1kFz106=xppppx According to IEC 60534-8-4, xFzis related to the reference inlet pressure p1= 6 ba

32、r (600 kPa). If other inlet pressures are used, they shall be corrected with the second term in the equation above (p1in kPa). Generally, xFzvaries with travel and shall be measured at relative flow coefficients of 0,25, 0,50, 0,75 and 1,00 or the highest one achievable. When necessary, additional m

33、easurements with other relative flow coefficients should be included. With these values of xFz, linear interpolation may be used to obtain xFzvalues for other relative flow coefficients. The value of xFzat a relative flow coefficient is denoted as xFz,. See Figure 3 for a typical curve of xFz. 8.2 T

34、est procedures 8.2.1 Test fluid Water is the only fluid to be used in the test procedure, because other incompressible fluids behave differently and do not allow a comparison of test data. The water shall be sufficiently free from suspended particles, air, or other gases so as to ensure that the tes

35、t results are not affected. To accomplish this, the suitability of the water shall be tested first by using a special orifice plate, which is to be considered the reference test orifice plate (Figure 4). This orifice plate shall be installed in a DN 50 pipe (either permanently in a bypass or by chan

36、ging the test section piping). The characteristic pressure ratio xFzfor the orifice plate shall be determined at an absolute upstream pressure between 300 kPa and 400 kPa (3 bar and 4 bar). The value of xFzshall be not less than 0,35. Water within a temperature range of 5 C to 40 C shall be the basi

37、c fluid used in this test procedure. During the test, the temperature shall remain constant within 3 C. Other orifice plates may be used as an alternative provided the upstream pressure is as stated above. The dimensions shown in Figure 4 shall remain the same, except that the diameters shall be cha

38、nged to maintain the same opening ratio of 0,25. 60534-8-2 IEC:2011 13 8.2.2 Test conditions for determination of xFzThe determination of xFzdepends on many parameters. A detailed explanation is beyond the scope of this section of IEC 60534-8. To make the test results comparable, the following test

39、conditions shall be maintained: a) Either closed or open test loops may be used in accordance with Figure 1a and 1b, provided all requirements of this standard are met. b) Absolute upstream pressure p1shall be in the range of 500 kPa to 700 kPa (5 bar to 7 bar). The selected test pressure shall be k

40、ept constant within 5 %. NOTE Caution should be exercised not to exceed the rated service conditions of the valve. c) To avoid incorrect results due to “cavitation hysteresis“, the characteristic pressure ratio xFzshall be determined by decreasing the pressure ratio xFin such a way that there is a t

41、ransition from cavitating to non-cavitating flow. d) Water within a temperature range of 5 C to 40 C shall be the basic fluid used in this test procedure. During the test, the temperature shall remain constant within 3 C. 8.3 Determination of xFz8.3.1 Peak frequency method The determination of xFzby

42、 this method requires the measurement of the sound pressure level (Lp) at the peak frequency. The procedure is as follows (refer to Figure 5): a) select a travel corresponding to one of the relative flow coefficients given in Clause 8; b) decrease the pressure ratio xFin such a way that there is a t

43、ransition 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 gives the maximum Lpresponse. This is the peak frequency; d) using a sound level meter with an octave band fi

44、lter 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 the cavitating and non-cavitating regions, fit a straight line through the data points. The intersection of

45、 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 method of determining xFzrequires the measurement of the overall sound pressure level (LpA) using the A-weig

46、hted 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 the dashed line shall be determined. Decrease the pressure ratio xFin such a way that there is a transition

47、 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 be determined; c) the ranges xFIand xFIIshall each be divided into three equal parts (designated as “a“ an

48、d “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 series of measurements; e) for each value of xF, the arithmetic average, pAL , of the three LpAvalues shall be

49、calculated and the points plotted; 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 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