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IS 4886:1991 is the Indian Standard (BIS) for fire safety of industrial buildings: tea factories. This code establishes the fire safety practices for tea factories. It details spatial planning, construction features for compartmentation, mitigation of process-specific hazards (like drying and sorting), and the required electrical and fire protection installations.
Code of practice for fire safety of industrial buildings: Tea factories
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Tea dust in the sorting and packing areas is highly combustible and prone to explosion; stringent dust extraction and ventilation systems are mandatory.
! Drying sections utilizing hot air furnaces must be structurally isolated from storage and packing areas using fire-resisting walls.
! Electrical fittings in dusty zones must be strictly dust-tight to prevent the ignition of airborne tea dust.
NFPA 61: 2024National Fire Protection Association (NFPA), USA
HighCurrent
Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities
Directly addresses fire and explosion hazards from processing agricultural products, including drying and dust generation.
BS 9999: 2017British Standards Institution (BSI), UK
MediumCurrent
Fire safety in the design, management and use of buildings — Code of practice
Provides a risk-based framework for fire safety in all building types, including industrial processing facilities.
NFPA 101: 2024National Fire Protection Association (NFPA), USA
MediumCurrent
Life Safety Code
Covers life safety and means of egress requirements applicable to industrial occupancies like tea factories.
FM Global Property Loss Prevention Data Sheet 7-76FM Global, USA
HighCurrent
Combustible Dusts
Specifically addresses the identification and mitigation of combustible dust hazards, a key risk in tea processing.
Key Differences
≠IS 4886 is highly prescriptive (e.g., specifying 230 mm brick walls), while modern international standards like NFPA 61 and BS 9999 are more performance-based or risk-assessed, allowing for engineered solutions.
≠International standards like NFPA 61 and NFPA 652 mandate a formal Dust Hazard Analysis (DHA) to identify and mitigate combustible dust explosion risks. IS 4886 addresses 'tea fluff' through housekeeping but lacks this systematic hazard analysis requirement.
≠IS 4886 relies primarily on hydrants and portable extinguishers. Modern international practice (e.g., NFPA) would strongly recommend or mandate automatic sprinkler systems for the fire control and life safety benefits in such a facility.
≠The Indian standard is dated 1991 and has not been updated. International equivalents like NFPA codes are revised every 3 years, incorporating the latest research, technology, and incident findings.
Key Similarities
≈Both IS 4886 and international codes emphasize the fundamental principle of compartmentation, requiring fire-rated separations between high-hazard process areas (like driers) and other areas.
≈The need for adequate and clearly marked means of egress, including limitations on travel distance to an exit, is a core concept in both IS 4886 and life safety codes like NFPA 101.
≈All standards stress the importance of controlling ignition sources, with specific rules for electrical installations, prohibition of smoking, and safe operating procedures for heat-producing equipment.
≈A strong emphasis on regular housekeeping to prevent the accumulation of combustible materials (tea dust and fluff) is a critical and universal fire prevention measure in both IS 4886 and international standards.
Parameter Comparison
Parameter
IS Value
International
Source
Maximum travel distance to an exit
30 m
61 m (200 ft) for general industrial occupancy (unsprinklered)
NFPA 101
Fire resistance of separating walls between departments
4 hours
1 to 2 hours for a 'fire barrier' separating hazard areas, depending on risk assessment
NFPA 101 / IBC
Provision of portable fire extinguishers
Based on floor area (1 extinguisher per 200 sq. m)
Based on hazard class and maximum travel distance to an extinguisher (e.g., 23 m for Class A hazard)
NFPA 10
External hydrant spacing/coverage
Sited to be not more than 30 m away from any part of the building.
Average spacing not to exceed 90 m (300 ft) in industrial complexes, with placement based on tactical use.
NFPA 1
Clearance for Driers from walls/columns
1 m
Based on manufacturer's installation instructions and listing; typically ~0.9 m (36 in) from combustible surfaces if not specified.
General practice, e.g., NFPA 54
Combustible Dust Management
General housekeeping to clean 'tea fluff'.
Mandatory Dust Hazard Analysis (DHA) and documented management program for dust collection, prevention, and ignition control.
NFPA 61 / 652
⚠ Verify details from original standards before use
Key Values3
Quick Reference Values
Fire resistance of separating wallsMinimum 2 hours
Minimum clearance of combustible materials from flues/chimneys500 mm
Maximum travel distance to exit for high hazard areas22.5 m
Tables & Referenced Sections
Key Tables
No tables data
Key Clauses
Clause 4 - Location and Grouping
Clause 5 - Constructional Features and Compartmentation
Clause 6 - Processes and Fire Risks (Withering, Drying, Sorting)
Clause 7 - Electrical Installations
Clause 8 - Fire Protection and Extinguishing Equipment
What are the primary fire risks in a tea factory?+
The main risks include high-temperature drying processes (furnaces/heaters), accumulation of highly combustible tea dust during sorting, and the storage of bulk packaging materials.
How should electrical wiring be managed in sorting and packing areas?+
Wiring must be enclosed in heavy-gauge metallic conduits and fixtures should be dust-proof to eliminate the risk of dust explosions.
What fire fighting equipment is required by default?+
First-aid fire extinguishers per IS 2190, fire buckets, and a dedicated water supply/hydrant system based on the factory's built-up area and risk profile.