IS 3595:2002 is the Indian Standard (BIS) for fire safety of industrial buildings: coal pulverizers and associated equipments. This code specifies fire safety requirements for coal pulverizing systems and associated equipment in industrial buildings, primarily focusing on thermal power plants. It outlines safe practices for preventing spontaneous combustion, managing dust explosions through adequate venting, and implementing active firefighting and inerting systems.
Code of Practice for Fire Safety of Industrial Buildings: Coal Pulverizers and Associated Equipments
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Explosion Venting Design | Recommends providing explosion vents as per 'good practice', often interpreted as a ratio like 1 m² per 20 m³ of system volume. | Requires detailed calculation based on dust explosibility (Kst), max explosion pressure (Pmax), and vessel strength (Pred) per NFPA 68. | NFPA 85 / NFPA 68 |
| Fire Barrier Rating (Pulverizer Bay) | 4-hour fire resistance rating for separating walls. | 2-hour fire resistance rating for fire barriers separating coal handling/pulverizer areas. | NFPA 850 |
| Pulverizer Outlet Temp. Limit (High Volatility Coal) | Controlled to not exceed 90°C. | Typically maintained below 160-170°F (71-77°C). | NFPA 85 |
| Oxygen Concentration During Inerting | Not explicitly specified as a percentage; requires creating an 'inert atmosphere'. | Oxygen content shall be maintained at 5% or less by volume. | NFPA 85 |
| Inerting Medium | Recommends use of saturated steam, carbon dioxide, or other inert gases. | Allows saturated steam, CO2, or N2. Prohibits use of superheated steam as it can be an ignition source. | NFPA 85 |
| Housekeeping (Dust Accumulation) | Requires regular cleaning to keep areas free of coal dust. | Dust accumulation must not exceed 1/32 in. (0.8 mm) over 5% of the floor area, or action is required. | NFPA 654 |