GB/T 17213.16-2015: Industrial-process control valves -- Part 8-4: Noise considerations -- Prediction of noise generated by hydrodynamic flow

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Scope

This Part of GB/T 17213 establishes a method to predict the noise generated in a
control valve by liquid flow and the resulting noise level measured downstream of the
valve and outside of the pipe. The noise may be generated both by normal turbulence
and by liquid cavitation in the valve. Parts of the method are based on fundamental
principles of acoustics, fluid mechanics, and mechanics. The method is validated by
test data. Noise generated by flashing flow is not considered in this standard.
The transmission loss (TL) equations are based on analysis of the interaction between
the sound waves inside the pipe and the coincidence frequencies in the wall of the
pipe taking into account that commercial pipe tolerances allow a relatively wide
variation in the thickness of the pipe wall. Ideal straight piping is assumed.
This Part is applicable to all conventional control valve styles including globe, butterfly,
cage-type, eccentric rotary, and modified ball valves. Tests so far have only been
conducted with water. The applicability of this method for fluids other than water is not
known at this time.
This Part considers only noise generated by hydraulic turbulence and fluid cavitation.
It does not consider any noise that might be generated by mechanical vibrations,
unstable flow patterns, and unpredictable behaviour. In the typical installation, very
little noise travels through the wall of the control valve body. The noise is measured at
the standard measuring point of 1 m downstream of the valve and 1 m away from the
outer surface of the pipe.
This prediction method has been validated with test results based on water covering
more than 90 % of all known valve types at inlet pressures of up to 15 bar. This method
is considered accurate within ± 5 dB (A) except in the range of xF = xFZ ± 0.1 [when xFZ
is calculated using equations (3a) or (3b)].

Basic Data

Standard ID	GB/T 17213.16-2015 (GB/T17213.16-2015)
Description (Translated English)	Industrial-process control valves -- Part 8-4: Noise considerations -- Prediction of noise generated by hydrodynamic flow
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	N16
Classification of International Standard	23.060.40; 25.040.40
Word Count Estimation	23,286
Date of Issue	2015-12-10
Date of Implementation	2016-07-01
Older Standard (superseded by this standard)	GB/T 17213.16-2005
Regulation (derived from)	National Standard Announcement 2015 No.38
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China