Noise treatment, if required, needs to be considered early in the preliminary design. Generally, noise treatment methods will add a considerable cost and increase the physical area required for the installation. A generator set is a complex noise source that includes the cooling fan noise, the engine noise, and the exhaust noise. Effective noise treatment has to address all of these sources of noise. For the most part, the recommended noise treatment methods modify or redirect the path for the noise from the generator set source to people hearing it. Simply using a critical grade muffler may or may not do anything to reduce the noise level at a specific location.
Because noise is directional, careful consideration needs to be given to the location, orientation, and distance of the generator set with respect to property lines or places where the noise may be objectionable.
Compliance with noise regulations requires an understanding of the ambient noise level and the resultant noise level with the generator set running at full load in that ambient. Noise regulations also exist to protect worker’s hearing. Persons working in generator rooms should always wear ear protection while a generator set is running.
From - Application Manual – Liquid Cooled Generator Sets (Cummins Power Generation)
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