ISO 20361:2019
Liquid pumps and pumps units — Noise test code — Grades 2 and 3 of accuracy
This document specifies all the information necessary to carry out efficiently and under standardized conditions the determination, declaration, and verification of the airborne noise emission of liquid pumps or pump units (see 4.1). It specifies the noise measurement methods and the operating and mounting conditions that shall be used for the test.
Noise emission characteristics include emission sound pressure levels at specified positions and the sound power level. The determination of these quantities is necessary for
— declaring the noise emission values, and
— purpose of noise control at source at the design stage.
The determination of these quantities is also necessary for comparing the noise emitted by liquid pumps on the market.
The use of this document ensures the reproducibility of the determination of the airborne noise-emission characteristics within specified limits determined by the grade of accuracy of the basic airborne noise measurement method used. Noise measurement methods according to this document are engineering methods (grade 2) and survey methods (grade 3).
This document does not deal with the characterization of the structure-borne sound and liquid-borne noise generated by liquid pumps.
NOTE This document is specified in EN 809+A1 for noise measurements of the pump (or pump unit).
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Pump family and pump configuration
5 Sound power level determination
5.1 General
5.2 Specific considerations for reference box, measurement surface, position of microphones, and intensity probe
5.2.1 General
5.2.2 Reference box
5.2.3 Measurement surface and microphone positions
5.2.4 Position of microphones and intensity probes
6 Emission sound pressure level determination
6.1 Basic standard to be used
6.2 Relevant work station
7 Uncertainty
8 Installation and mounting conditions
8.1 General
8.2 Noise test situation
8.2.1 General
8.2.2 Test on site
8.2.3 Test on shop test stand
8.2.4 Test on a specific facility intended for acoustic measurement
9 Operating conditions during noise measurement
9.1 General
9.2 Pumped liquid
9.3 NPSHA value
10 Information to be recorded and to be reported
10.1 General
10.2 Test report
11 Declaration and verification of noise emission values
Annex A (normative) Pump alone — Measurement surface
Annex B (normative) Pump units — Microphone positions for sound pressure level measurement on the measurement surface for different pump types and sizes
Annex C (informative) Example of a dual-number noise declaration
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Pump family and pump configuration
5 Sound power level determination
5.1 General
5.2 Specific considerations for reference box, measurement surface, position of microphones, and intensity probe
5.2.1 General
5.2.2 Reference box
5.2.3 Measurement surface and microphone positions
5.2.4 Position of microphones and intensity probes
6 Emission sound pressure level determination
6.1 Basic standard to be used
6.2 Relevant work station
7 Uncertainty
8 Installation and mounting conditions
8.1 General
8.2 Noise test situation
8.2.1 General
8.2.2 Test on site
8.2.3 Test on shop test stand
8.2.4 Test on a specific facility intended for acoustic measurement
9 Operating conditions during noise measurement
9.1 General
9.2 Pumped liquid
9.3 NPSHA value
10 Information to be recorded and to be reported
10.1 General
10.2 Test report
11 Declaration and verification of noise emission values
Annex A (normative) Pump alone — Measurement surface
Annex B (normative) Pump units — Microphone positions for sound pressure level measurement on the measurement surface for different pump types and sizes
Annex C (informative) Example of a dual-number noise declaration
Bibliography