IS 3483:1965 is the Indian Standard (BIS) for noise reduction in industrial buildings. This code provides comprehensive guidelines for reducing noise in industrial buildings. It covers acceptable noise levels for various functional areas, proper layout and siting of facilities, and techniques for sound insulation and absorption to protect worker health and improve acoustic efficiency.
Code of practice for noise reduction in industrial buildings
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Target Noise Level (Workshop) | Recommends general levels, often referencing Noise Rating curves (e.g., NR-65 to NR-75). | Focus on meeting occupational exposure limits, e.g., daily exposure of LEX,8h < 85 dBA. Design goal is often < 80 dBA. | ISO 11690-1:2020 |
| Target Noise Level (Industrial Office) | Recommends levels based on NR curves, typically NR-40 to NR-50. | Specifies design targets in dBA, e.g., 40-50 dBA LAeq,T for routine office work. | BS 8233:2014 |
| Partition Sound Insulation (Office-Workshop) | Qualitative advice to use heavy, rigid partitions; suggests an 'average sound reduction' of 40-45 dB. | Specifies performance using modern single-number ratings, e.g., a Weighted Sound Reduction Index (Rw) of 50-55 dB. | BS 8233:2014 |
| Reverberation Control | Recommends keeping reverberation time 'as low as practicable', suggests 1.0 - 1.5 seconds for workshops. | Focuses on achieving a specific reduction in the reverberant sound pressure level (e.g., 3-8 dB) by adding a calculated amount of absorption. | ISO 11690-1:2020 |
| Machinery Noise Specification | Advises selecting 'quieter types of machines' qualitatively. | Promotes a quantitative 'buy quiet' policy, requiring vendors to declare machine Sound Power Level (LwA) per ISO 3740 series standards. | ISO 11690-1:2020 |
| Acoustic Barrier Design | Rule-of-thumb: barrier must break the line-of-sight between source and receiver. | Performance-based: design is based on achieving a target insertion loss (e.g., 5-15 dB) calculated using path length difference and frequency. | ISO 11690-2:1996 |