000			01391nam a22001217a 4500
999			_c16226 _d16226
245			_aIEC 60534-8-2:2011-Industrial-process control valves - Part 8-2 : _bNoise considerations - Laboratory measurement of noise generated by hydrodynamic flow through control valves
250			_a2.0
260			_aGeneva : _bInternational Electrotechnical Commission, _c2011.
300			_a45 p.
505			_aIEC 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.
650			_aNoise
942			_cST