IEC 60534-8-2:2011 includes the method for measuring the sound pressure level due to liquid flow through a control valve and the method for determining the characteristic increase of noise due to the onset of cavitation. It also defines the equipment, methods and procedures for the laboratory measurement of the airborne sound needed to determine these characteristics. Two methods are provided for testing the noise generating characteristics of control valves. The first is a uniform method of measuring the radiated noise from the valve and the associated test piping including fixed flow restrictions through which the test fluid (water) is passing. The second is a procedure for measuring the sound pressure levels within pipe systems upstream and downstream of the valve under fixed operating conditions. This second edition cancels and replaces the first edition published in 1991 and constitutes a technical revision that includes internal noise measurement.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 6<\/td>\n | English \n CONTENTS <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3 Terms and definitions 4 Symbols 5 General test criteria 5.1 General <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5.2 Pressure regulating devices 5.3 Test specimen insulation 5.4 Test section piping 5.5 Pressure taps 5.6 Acoustic environment 5.7 Instrumentation <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 6 External sound pressure measurement 6.1 General 6.2 Instrumentation for noise measurement 6.3 Test data accuracy 6.4 Test data <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 7 Internal sound pressure measurement 7.1 Test system 7.2 Instrumentation for noise measurement 7.3 Test fluid <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 7.4 Background noise 7.5 Sound level sensor position 7.6 Test data accuracy 7.7 Test data <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 7.8 Accuracy 7.9 Data evaluation 8 Determination of the characteristic pressure ratio xFz 8.1 General 8.2 Test procedures <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 8.3 Determination of xFz <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Figures \n Figure 1 \u2013 System components for control valve closed loop and open loop noise test <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Figure 2 \u2013 Test arrangements with specimen outside and (alternatively) \ninside acoustic environment <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure 3 \u2013 Typical curve for characteristic pressure ratio xFz Figure 4 \u2013 Reference test orifice plate (see 8.2.1) <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure 5 \u2013 Determination of xFz by peak frequency method (see 8.3.1) <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Figure 6 \u2013 Determination of xFz by measuring the overall LpA,\u00a0dB(A), at a constant valve travel <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Figure 7 \u2013 Mounting position of the sound level meter in the pipe for \u2206h < 0,5 \nmm <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Bibliography \n <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Industrial-process control valves – Noise considerations. Laboratory measurement of noise generated by hydrodynamic flow through control valves<\/b><\/p>\n |