means of escape

1.0 Introduction

  • Fire incidents have reached unprecedented levels, leading to significant casualties and damage.

  • Notable incidents include the Uphar Cinema fire, resulting in the loss of 59 lives.

  • Fire is an unpredictable and destructive force that inflicts substantial financial and emotional tolls.

1.2 High-rise Buildings and Fire Safety

  • Definition of High-Rise Buildings: Buildings over 15 meters (according to NBC 10) demand increased fire prevention and protection measures.

  • The Delhi Fire Prevention Fire Protection Act was enacted on March 2, 1987, impacting pre-1983 constructions.

  • Over 200 skyscrapers in Delhi lack adequate fire-fighting equipment, leading to potential risks.

  • Definitions of high-rise buildings vary by location; for example, in Greater Bombay, buildings above 24 meters are classified as high-rise.

1.3 Rescue Operations and Evacuation

  • The increased height of buildings complicates rescue operations and creates psychological challenges for occupants.

  • Safety Definition: Being in a refuge area free from hazards, but true safety is often perceived only when on the ground.

  • Fire services are critical for positioning rescue ladders and ensuring safe evacuation routes.

2.0 Means of Escape

  • The primary objective of escape planning is to allow occupants to reach safety unharmed.

  • Places of Safety: Considered as areas outside the building or protected areas within, such as:

    • Protected corridors

    • Protected staircases

    • Refuge areas

  • The definition of means of escape: "Structural elements of the building enabling occupants to escape unaided to a safe area."

3.0 Main Considerations in Escape Planning

  • Factors to consider when establishing escape routes:

    1. Provide alternative exits such as staircases and balconies.

    2. Evaluate the position, number, and spacing of staircases.

    3. Ensure adequate protection against smoke logging and fire spread.

    4. Maintain clear distinctions between areas with special fire risks.

    5. Ensure availability of doors, windows, and exits.

4.0 Components of Means of Escape

  • Factors influencing escape route effectiveness include:

    1. Building Construction: Fire-resistant structure design and material use to inhibit spread of fire and smoke.

    2. Building Contents: Differentiate between the storage of combustible and non-combustible materials in terms of hazards.

    3. Occupancy Considerations:

      • Population density and distribution affect evacuation strategies.

      • Mobility of occupants, considering age and physical condition.

      • Reaction under stress and panic inducing situations, affecting orderly evacuation.

      • Discipline and familiarity among occupants regarding fire safety measures.

    4. Evacuation Time: Must be minimized; effective timing depends on architectural design and occupancy hazards.

    5. Travel Distance: Defined as the distance from the furthest point of a floor to a safe exit.

4.6 Exit Requirements

  • General Exits: Must be unobstructed and sufficient for safe evacuation in emergencies.

  • Exits are to be visible, well-marked, properly illuminated, and equipped with fire-fighting equipment.

  • Adequate exit width is essential; calculated based on occupancy and expected flow rate (40 persons per minute per width unit).

4.10 Doors in Escape Routes

  • Self-closing fire-resistant doors are crucial for maintaining safety during emergencies.

  • Doors should be designed to facilitate quick exit (swing in both directions when needed).

4.11 Emergency Lighting

  • Essential for visibility during power failures to assist occupant movement in emergencies.

  • Emergency lighting systems must be independent from normal systems and should automatically activate during outages.

4.12 Fire Detection Systems

  • Residential fire safety depends on:

    1. Detection system installation and effectiveness.

    2. Comprehensive escape route planning.

4.15 Alarm Systems

  • Must effectively alert occupants to threats, taking into account various sensory modes to accommodate all individuals (e.g., visual alarms for the hearing impaired).

4.17 Smoke Control Systems

  • Smoke control involves methods to protect escape routes from fire products, including natural and mechanical ventilation strategies.

  • Effective smoke control systems must be reliable and available immediately during emergencies.

5.0 Mock-Up Drills

  • Periodic fire drills cultivate fire awareness, enhancing occupants' confidence and response time during emergencies.

6.0 Conclusion

  • Emphasizes ongoing consciousness regarding safety within high-rise buildings.

  • Provisioning for means of escape is vital and reflects societal advancement in architecture and safety.

  • Psychological preparedness is as crucial as physical rescue equipment; moral support during emergencies can significantly impact outcomes.

References

  • Shields, J., & Silcock, Building Fires.

  • Works from the Fire Adviser’s Office and Defence Institute of Fire Research.