IS 4226:1988 is the Indian Standard (BIS) for fire safety of industrial building: aluminium/magnesium powder factories. This code of practice provides essential fire safety, layout, and construction requirements for industrial buildings that manufacture or handle aluminium and magnesium powders. It strongly emphasizes the prevention of dust explosions through venting, dust-tight electrical fittings, and strictly prohibits the use of water and certain other conventional fire extinguishing media that react violently with burning metal powders.
Code of practice for fire safety of industrial building: Aluminium/Magnesium powder factories
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Explosion Venting Requirement | Prescriptive ratio of not less than 1 m² for every 15 m³ of room volume. | Engineered design based on NFPA 68 using dust properties like Kst and Pmax. No simple ratio is provided. | NFPA 484 |
| Dust Hazard Assessment | Not explicitly required; compliance is based on following the code's prescriptive rules. | A formal, documented Dust Hazard Analysis (DHA) is mandatory. | NFPA 652 / NFPA 484 |
| Dust Accumulation Threshold | Qualitative: 'shall not be allowed to accumulate'. No specific thickness is defined. | Quantitative: Action required when dust depth exceeds 1/32 inch (0.8 mm) over 5% of the floor area (per NFPA 652). | NFPA 484 |
| Electrical Equipment Classification | Dust-tight construction conforming to IS 2148-1968. | Suitable for Class II, Group E hazardous locations as defined by NFPA 70 (NEC). | NFPA 484 |
| Building Separation Distance | 15 m between process buildings; 30 m to property line or other buildings. | Risk-based, typically 50 ft (15.2 m) to 100 ft (30.5 m) or more, depending on construction and hazard level. | FM Global Data Sheet 7-11 |
| Personal Protective Clothing | Fire-retardant cotton overalls; Asbestos or leather gloves. | Flame-resistant garments (FRG) required; synthetic materials that melt (polyester, nylon) are prohibited. Asbestos is banned. | NFPA 484 |
| Dust Collector Location (Dry Type) | Shall be located on the outside of the building or on the roof. | Shall be located outside of buildings. Indoor locations are permitted only under very strict, highly protected conditions. | NFPA 484 |