Industrial-process control valves - Part 8-2: Noise considerations - Laboratory measurement of noise generated by hydrodynamic flow through control valves (Endorsed by AENOR in March of 2012.)

2Scope / Description

This part of IEC 60534-8 covers methods for measuring the sound pressure levels generated by liquids flowing through control valves, and for determining the increase in noise characteristics due to cavitation phenomena. It also defines the equipment, methods and procedures required for laboratory measurements of airborne sound to determine these characteristics. Two methods are provided for testing the noise generation characteristics of control valves. The first is a unified method for measuring the noise radiated from valves and associated test piping, including a fixed flow restriction, through which the test fluid (water) passes (see Note 1). The noise criterion is expressed by determining the sound pressure level for the valve under consideration. The second is a procedure for measuring the sound pressure level within the piping system upstream and downstream of the valve under fixed operating conditions. This method should be used in preference to assessing the acoustic characteristics of valves because it eliminates inaccuracies caused by piping transmission.