Since engineering companies usually develop industrial complex by combining and connecting among them many static and rotating equipment with piping, the noise calculation and model of the latter are necessary when carrying out acoustic design to comply with occupational and environmental noise limits. According to the set of available input data, different design procedures can be followed both to model pipe noise and to design sound reduction systems, if needed. Examples of methods for piping noise modeling and insulation design, starting from inside or outside pipe noise levels given by equipment supplier or from in field measured noise or vibration levels, are here shown, analyzed, and discussed. Specifically, the paper describes case studies of steel piping system relevant to installation usually present in a generic industrial plant: a steam pressure reduction station, constituted by control valves and desuperheating devices; a large cooling water pump; and a feeding cooling water station where, accidentally, a regulation valve was excessively noisy. In‐plant noise measurements after start up, for methodology reliability evaluation, are reported and discussed too.