GB/T 39959-2021 (English Version) PDF

Scope: This standard specifies the relevant information on the effective implementation of the noise test of liquid pumps or pump units (see 4.1), the measurement, labeling and verification methods of the air noise emitted by them under standard conditions, as well as the noise measurement methods and test operation of liquid pumps or pump units. and equipment conditions. Noise emission characteristics include sound power level and emission sound pressure level at a specified point. The determination of these quantities can be used for: --- marking the noise emission value; --- control of noise sources in the design stage. The determination of these quantities is also necessary for comparison with the noise of liquid pumps on the market. The application of this standard ensures the reproducibility of the determination of the emission characteristics of airborne noise within certain limits determined by the accuracy class of the method used for airborne noise measurement. The noise measurement methods covered by this standard include engineering method (level 2) and simple method (

GB/T 39959-2021 Referenced Document

GB/T 33925.1-2017 Liquid pumps and installation—General terms, definitions, quantities, letter symbols and units—Part 1: Liquid pumps
GB/T 33925.2-2018 Liquid pumps and installation—General terms, definitions, quantities, letter symbols and units—Part 2: Pumping system
GB/T 3767-2016 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Engineering methods for an essentially free field over a reflecting plane
GB/T 3768-2017 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Survey method using an enveloping measurement surface over a reflecting plane
GB/T 6881.2-2017 Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Engineering methods for small movable sources in reverberant fields—Comparison method for a hard-walled test room
ISO 11203:1995 Acoustics - Noise emitted by machinery and equipment - Determination of emission sound pressure levels at a work station and at other specified positions from the sound power level
ISO 3743-2:2018 Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms
ISO 4871:1996 Acoustics - Declaration and verification of noise emission values of machinery and equipment

2021 GB/T 39959-2021 Liquid pumps and pump units—Noise test code—Grades 2 and 3 of accuracy