This standard delivers a detailed framework for fire safety protocols in industrial facilities utilizing coal pulverizers and related machinery. It encompasses guidelines for fire hazard prevention, early detection, and control measures across coal storage, pulverizing units, conveyors, feeders, and burner systems, ensuring secure operations in coal-based industrial settings. It is crucial for engineers, safety officers, and operational managers overseeing coal handling and pulverizer installations to manage fire risks effectively.
Overview
This standard delivers a detailed framework for fire safety protocols in industrial facilities utilizing coal pulverizers and related machinery. It encompasses guidelines for fire hazard prevention, early detection, and control measures across coal storage, pulverizing units, conveyors, feeders, and burner systems, ensuring secure operations in coal-based industrial settings. It is crucial for engineers, safety officers, and operational managers overseeing coal handling and pulverizer installations to manage fire risks effectively.
Audience
Contents
Structure
Overview of the code covering raw coal storage and handling with emphasis on fire prevention measures. Includes key definitions from IS 8757 alongside additional terms specific to this standard. Specifies maximum coal heap widths depending on fire hydrant availability to reduce fire hazards.
Clarification of terms used, adopting IS 8757 definitions supplemented by specific expressions related to fire safety in coal handling. Details the parameters for safe coal heap dimensions linked to fire hydrant placement and requirements for fire safety equipment maintenance.
Prescribes maximum permissible dimensions for coal heaps based on hydrant availability ensuring adequate fire access. Highlights necessary construction features such as stable slopes, proper drainage, and routine inspection of fire protection systems.
Guidelines to achieve coal fineness and ensure compatibility with air supply systems. Specifies minimum duct velocities to prevent coal dust accumulation, stable burner flame requirements, and mandatory fire suppression systems for non-inert atmosphere pulverizers.
Instructions for mechanical compaction of coal layers, slope restrictions for heap stability, maximum heap height based on coal size, and design of heap shapes and access ways. Emphasizes ventilation and monitoring to mitigate spontaneous combustion.
Specifies minimum vent areas for pulverized coal bins, piping, and buildings to relieve explosion pressures. Recommends single-storey construction for coal handling zones and protective venting requirements for driers.
Details maintenance of fire hydrants, hoses, and fittings as per fire brigade standards. Covers installation of automatic fire detectors and alarms compliant with relevant IS codes, including spark and temperature sensing devices and manual alarm call points.
Defines pressure design criteria for equipment near or above atmospheric pressure, safe storage of flammable substances away from pulverizing plants, specifications for safe lighting installations, and detailed fire and temperature detection requirements.
Defines coal driers as apparatus for drying coal under inert atmospheres, emphasizing separate fire-resistant compartments or buildings, structural considerations, ventilation, and related feeder equipment design.
Mandates use of fire-retardant belts for critical conveyors, construction of conveyor enclosures with non-combustible materials, provision of maintenance access, and cleaning practices to minimize fire risks.
Prescribes placement of spark detectors, temperature sensors, thermostats, fixed heat detectors, and manual alarm call boxes. Specifies types and placement of fire extinguishers and automatic suppression systems within pulverizing plants.
Highlights adherence to manufacturer’s maintenance guidelines, routine inspection of conveyor belts, safety precautions during welding and cleaning operations, and safe storage of fuels and oils.
Defines interlocks as safety devices preventing hazardous sequences. Specifies fail-safe design without manual overrides until faults are cleared, with examples of interlock logic in burner line valve operations.
Outlines training requirements for fire hydrant operation, use of portable extinguishers, coal heap dimensioning according to fire hydrant availability, and coordination with public fire services.
Includes committee member details, amendments replacing fixed halon systems with ABC class dry powder extinguishers, references to related IS fire safety codes, and maintenance best practices.
Frequently Asked
IS 3595 advises constructing conveyor housings and floors from non-combustible materials such as steel, corrugated iron sheets, asbestos, or concrete. The design should minimize wind-induced chimney effects, include access points for inspection and cleaning, and incorporate fire-resistant conveyor belts. Regular cleaning and maintenance are essential to prevent coal dust accumulation and ignition sources.
Temperature monitoring involves installing vertical metal pipes spaced at 4.5-meter intervals within the coal heap. Each pipe extends near the base and protrudes above the heap, remaining closed and pointed at the bottom. Daily temperature readings are taken, increasing in frequency if temperatures rise 5°C above ambient. If temperatures reach 60°C, the heap should be opened to remove or cool hot coal, with water sprays used cautiously only after exposure to prevent hazards.
Fire prevention in feeders and bunkers includes routine internal cleaning to remove compacted coal, maintaining sealed bunker gates and mill dampers to prevent ingress of combustion gases, ensuring proper ventilation to avoid forced draughts, and preventing accumulation of residual coal by using stainless steel linings. Operators should be aware of fire causes like hot coal transfer, mechanical friction, and gas cutting during maintenance.
Pulverizing equipment must be effectively electrically bonded and earthed, with earth resistance tested at least annually to ensure safety. Equipment should be constructed from non-sparking materials, and automatic fixed CO2 or halon fire extinguishing systems installed if pulverizing occurs in normal atmosphere. Continuous bonding and low earth resistance prevent static buildup and reduce ignition risk.
Fire detection systems must include spark detectors at conveyor starts, temperature sensors on rollers, thermostats in driers, temperature monitors for coal-air mixtures, fixed linear heat detectors on conveyors and cables, and manual electrical fire alarms with call boxes on each floor. Fire suppression requires automatic fixed CO2 or halon systems for bins, ducts, and pulverizers, with automatic sprinklers in buildings. All devices should connect to control panels providing audio-visual alerts, and lighting fixtures must be safely suspended to reduce fire risk.
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