IS 3058:1990 is the Indian Standard (BIS) for fire safety of industrial buildings: viscose rayon yarn and/or staple fibre plants. This standard provides comprehensive fire safety requirements for the layout, construction, and protection of industrial buildings used as viscose rayon yarn and staple fibre plants. It specifically addresses the severe fire and explosion hazards associated with handling highly volatile chemicals like carbon disulphide (CS2) during the manufacturing process.
Code of practice for fire safety of industrial buildings: Viscose rayon yarn and/or staple fibre plants
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Fire wall resistance rating | Not less than 4 hours for separating walls between major blocks. | Typically 2 to 4 hours, based on building construction type and occupancy hazard classification. | NFPA 221 |
| Separation distance (major hazard buildings) | Minimum clear distance of 30 m for churning and xanthation buildings. | Often based on consequence modeling and risk assessment; prescriptive distances for storage tanks may apply, but less so for entire buildings. | NFPA 30 / FMDS 7-32 |
| Ventilation rate in CS2 areas | Should be capable of at least 30 air changes per hour. | Performance-based: Sufficient to maintain vapor concentration below 25% of the Lower Flammable Limit (LFL). | NFPA 30 |
| Hazardous Area Classification for CS2 | Defines areas as hazardous, requiring 'flameproof' (Ex d) equipment. | Class I, Division 1 or 2, Group C. Requires specifically rated equipment for that classification. | NFPA 70 (NEC) |
| External hydrant spacing | At 30 m intervals along roadways. | Typically spaced no more than 75-80 m (250-260 ft) apart, with location determined by building access and hazard level. | NFPA 24 |
| Water spray system design density | 10 lpm/m² for certain equipment and pump rooms. | 0.30 to 0.50 gpm/sq.ft (approx. 12.2 to 20.4 lpm/m²) depending on the specific application and hazard being protected. | NFPA 15 |