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ČSN EN ISO 20361 The noise emitted by a pump unit can be radiated by the casing of the pump, the driving system (e.g. motor, gear box, coupling), the piping system, and all the connected structures. On site, the perceived noise can be significantly increased by reverberation effects or by the radiation of extraneous sources. Depending on the type of pump it can be useful to know the following: a) the noise of the pumping system (including piping); b) the noise of the pump unit, including the driver and the transmission elements but excluding the noise of the piping system; c) the noise emitted by the pump alone, excluding the noise from the driver, transmission elements, and the piping; d) the noise emitted by each of those elements in respect to a given requirement or in view of an efficient sound proofing of the installation. This International Standard describes methods for the determination of the noise emitted by a pump unit [case b)] or a pump alone [case c)]. Noise emission is expressed in terms of the sound power level of the machine and the emission sound pressure level at the relevant work station (see 6.2). This International Standard is intended to enable the manufacturer to - show the effectiveness of noise reduction, and - declare the noise emission levels. This International Standard is a type C standard as stated in ISO 12100-1 and ISO 12100-2. When provisions of this type C standard are different from those which are stated in A or B standards, the provisions of this type C standard take precedence. The machinery concerned and the extent to which noise is covered are indicated in the scope of this International Standard.