BS EN 60534-8-3:2011
$198.66
Industrial-process control valves – Noise considerations. Control valve aerodynamic noise prediction method
| Published By | Publication Date | Number of Pages |
| BSI | 2011 | 52 |
IEC 60534-8-3:2010 establishes a theoretical method to predict the external sound-pressure level generated in a control valve and within adjacent pipe expanders by the flow of compressible fluids. This method considers only single-phase dry gases and vapours and is based on the perfect gas laws. It is assumed that the downstream piping is straight for a length of at least 2 m from the point where the noise measurement is made. The method is applicable to the following single-stage valves: – globe (straight pattern and angle pattern), – butterfly, – rotary plug (eccentric, spherical), – ball, and – valves with cage trims. Specifically excluded are the full bore ball valves where the product FpC exceeds 50 % of the rated flow coefficient. This third edition cancels and replaces the second edition published in 2000. This edition constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows: – predicting noise as a function of frequency; – using laboratory data to determine the acoustical efficiency factor.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 6 | English CONTENTS |
| 8 | INTRODUCTION |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 11 | 4 Symbols |
| 14 | 5 Valves with standard trim 5.1 Pressures and pressure ratios |
| 15 | 5.2 Regime definition |
| 16 | 5.3 Preliminary calculations |
| 17 | 5.4 Internal noise calculations Tables Table 1 – Numerical constants N Table 2 – Typical values of valve style modifier Fd (full size trim) |
| 19 | Table 3 – Overview of regime dependent equations |
| 20 | Table 4 – Typical values of An and Stp |
| 21 | 5.5 Pipe transmission loss calculation Table 5 – Indexed frequency bands |
| 23 | 5.6 External sound pressure calculation Table 6 – Frequency factors Gx (f) and Gy (f) |
| 24 | 5.7 Calculation flow chart 6 Valves with special trim design 6.1 General 6.2 Single stage, multiple flow passage trim Table 7 – “A” weighting factor at frequency f |
| 25 | 6.3 Single flow path, multistage pressure reduction trim (two or more throttling steps) Figures Figure 1 – Single stage, multiple flow passage trim |
| 26 | Figure 2 – Single flow path, multistage pressure reduction trim |
| 27 | 6.4 Multipath, multistage trim (two or more passages and two or more stages) |
| 28 | Figure 3 – Multipath, multistage trim (two or more passages and two or more stages) |
| 29 | 7 Valves with higher outlet Mach numbers 7.1 General 7.2 Calculation procedure |
| 30 | 8 Valves with experimentally determined acoustical efficiency factors |
| 31 | 9 Combination of noise produced by a control valve with downstream installed two or more fixed area stages |
| 32 | Figure 4 – Control valve with downstream installed two fixed area stages |
| 33 | Annex A (informative) Calculation examples |
| 34 | Table A.1 – Calculation: examples 1 to 6 |
| 41 | Table A.2 – Calculation: example 7 |
| 48 | Bibliography |
