ISO 2151:2004规定了便携式和固定式压缩机及真空泵噪声排放的测量、测定和声明方法。它规定了进行测量的安装、负载和工作条件，包括测量或确定噪声发射，表示为指定负载条件下的声功率级和指定负载条件下工作站的发射声压级。 适用于各种气体、油、气的压缩机- 润滑空气压缩机、油浸式空气压缩机、注水式空气压缩机、无油空气压缩机、用于处理有害气体的压缩机（气体压缩机）、用于处理氧气的压缩机、用于处理乙炔的压缩机、高压压缩机（超过40巴/4兆帕）、用于低入口温度（即低于0°C）的压缩机，大型压缩机（输入功率超过1000 kW）、便携式和撬装式空气压缩机、旋转容积式鼓风机、离心式鼓风机和抽风机，适用于2 bar/0,2 MPa或以下的应用。 本标准不适用于除乙炔以外的气体压缩机（最大允许工作压力小于0.5 bar/0.05 MPa）、制冷系统或热泵中使用的制冷剂压缩机，也不适用于手持式便携式压缩机。

ISO 2151:2004 specifies methods for the measurement, determination and declaration of the noise emission from portable and stationary compressors and vacuum pumps. It prescribes the mounting, loading and working conditions under which measurements are to be made, and includes measurement or determination of the noise emission expressed as the sound power level under specified load conditions and the emission sound pressure level at the work station under specified load conditions. It is applicable to compressors for various types of gases, oil-lubricated air compressors, oil-flooded air compressors, water injected air compressors, oil-free air compressors, compressors for handling hazardous gases (gas compressors), compressors for handling oxygen, compressors for handling acetylene, high pressure compressors (over 40 bar/4 MPa), compressors for application at low inlet temperatures (i.e. below 0 °C), large compressors (over 1 000 kW input power), portable and skid-mounted air compressors, and rotary positive displacement blowers and centrifugal blowers and exhausters in applications of 2 bar/0,2 MPa or less. It is not applicable to compressors for gases other than acetylene having a maximum allowable working pressure of less than 0,5 bar/0,05 MPa, refrigerant compressors used in refrigerating systems or heat pumps, nor to hand-held portable compressors.