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By MANUJ SINGHAL , AGM / Electrical

Presentation on “ SAFETY IN LIFTS ”. By MANUJ SINGHAL , AGM / Electrical . SOME RECENT LIFT INCIDENTS. 18.06.2013 :- Nine people had a narrow escape when the cables of an elevator at New Delhi House in Barakhamba Road snapped and Lift plummeted four floors down the shaft.

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By MANUJ SINGHAL , AGM / Electrical

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  1. Presentation on “SAFETY IN LIFTS ” By MANUJ SINGHAL, AGM / Electrical

  2. SOME RECENT LIFT INCIDENTS • 18.06.2013:- Nine people had a narrow escape when the cables of an elevator at New Delhi House in Barakhamba Road snapped and Lift plummeted four floors down the shaft. • 11.10.2013:- Four persons trapped in a lift in the Silver Tower complex in Sector 18, Noida. They took elevator for the 11th floor, but the lift suddenly stopped between third and fourth floors. • 20.10.2013:- Family gets stuck in Lift for 2 hours in a Hotel in Sector – 26, Noida. The family took the Lift which got stuck between Ground Floor and First Floor and then slipped to Basement.

  3. GROWTH IN LIFTS • Annual Growth Rate in Lifts Sale is 12 – 13 % Based on Data of a leading Lift Manufacturer

  4. REASONS FOR GROWTH IN USE OF LIFTS • With rapid Urbanization and due to limited land space, Vertical growth has increased. • Need of Vertical Transportation has increased • Solutions are:- • Lifts – Escalators, • Both Solutions have their merits & demerits.

  5. LIFTS IN DMRC

  6. CHALLENGES FOR METRO SYSTEM • Street level, Concourse and Platform are at different Heights (Vertical levels). • Heavy Usage of the provided facilities, • Continuous operation for 20 hrs X 365 days, • Variable levels of Commuter Understanding • Vandalism / Mishandling of the components. Safety of Commuters is Paramount.

  7. APPLICABLE STANDARDS STANDARDS FOR LIFTS • IS – 14665: All parts (Latest Version). • IS – 15785: Installation and Maintenance of lifts without Conventional machine rooms • IS – 15330: Installation and Maintenance of lifts for Handicapped Persons – Code of Practice. • EN 81 – 1: Safety rules for construction & installation of electric lifts.

  8. As per EN 81, Persons to be safeguarded are :- a) users; b) maintenance and inspection personnel; c) persons outside the lift well, the machine room and pulley room (if any).

  9. Elevator Safety Circuit Arrangement Safety Gear Car Roof Stop OSG Final Limit Switch Pit Stop Switch Inspection Mode Switch Inspection UP Button Inspection Down Button Blocking Device Inspection Run Button Car Door Contact Landing Door Contact Final Safety input

  10. Safeties for persons outside the Lift • 3D full height curtain of light in the car door, • Full Fascia plate for the car of 750mm

  11. SAFETY FEATURES FOR MAINTENANCE & INSPECTION IN LIFT PIT • Pit ladder = Height of Pit + 1250 mm. • Two Pit switches – In Pit adjacent to Pit ladder. One at 500mm from pit level & other at 1200mm from the bottom most landing.

  12. MTCE. SAFETY FEATURES ON CAR TOP • Car Top Inspection Box – Stop switch • Inspection drive – When Lift is in Inspection Drive Mode, it can be moved with limited speed by pressing inspection drive buttons. Lift moves only till Button is pressed. • Blocking Device – During maintenance / inspection work on machines, these blocking devices are used. This will stop movement of car both Mechanically & Electrically.

  13. SAFETY FOR LIFT PASSENGERS • Over Speed Governor switch (Electrical Trip) • Over Speed Governor (OSG) • Tension weight switch • Final Limit Switch – to protect against Car over travel both in up and down directions. • Spring Buffers. • ALARM BUTTON • INTERCOM

  14. RESCUE ARRANGEMENTS • Emergency rescue device (ERD) • Electrical rescue tool (ERT) • Manual brake release lever

  15. Features for Differently ABLED • 3D LIGHT CURTAIN • PHOTO CELLS / SENSORS • HAND RAILS ON SIDE WALLS • MIRROR ON THE REAR WALL • LEVELING ACCURACY – + 5mm • BUTTON OF LARGE SIZE WITH BRAILLE • LIFT ANNOUNCEMENT SYSTEM

  16. FURTHER STEPS BY DMRC • Lift & Escalator Cell in DMRC (O&M). • Some equipment being maintained in house. Result:- • In depth analysis of accidents & component failures • Valuable inputs provided to Manufacturer for action, • Performance requirements in Tender Specifications upgraded.

  17. FEEDBACK REGARDING LIFTS ACCIDENTS Total 3 (Three) Accidents all in Phase -1 Lifts: Object stuck between Door & Door Frames. Solution:- Door Profile fixed to reduce gap. As per EN81-1:1998, “to avoid dragging of children hands, automatic power operated horizontally sliding doors made of glass shall be provided with means to minimize the risk such as: • Reducing coefficient of friction between hands and glass • Sensing the presence of fingers”

  18. FINGER PROFILE FOR ELEVATOR DOORS: • When the gap between car door and car entrance panel or between landing door and entrance frame is above 5mm, finger profile is provided to minimize the gap.

  19. FIXING OF FINGER PROFILE (CAR)

  20. FEEDBACK REGARDING LIFTS Contd. OTHER MAJOR ISSUES • PASSENGER TRAPPING • COMPONENT FAILURES

  21. PASSENGER TRAPPING • Passenger Trapping is :- When Lift gets stuck between floors with Passengers inside. • 21 % of Man traps were due to Door Problems. • A solution being worked out is Landing Door By Pass with Lift Manufacturer.

  22. Landing Door Bypass unit The Lift starts only when Car door & Landing door are closed Mechanically & Electrically. Subsequently, if the door contact gets stuck or disturbed, the software will run the lift in slow speed (approximately 0.3 m/s) with an Audio & Visual indication till it reaches the nearest landing & the doors will open.

  23. Audio Indication Visual Indication

  24. COMPONENT FAILURES • Based on Annual usage / operations, Lifts have been divided into three categories:- Category – A :- above 5 lakhs, Category – B :- 2.5 lakhs to 5 lakhs, Category – C :- below 2.5 lakhs, Accordingly Predictive Replacement Plans for components (like Batteries, Electronic cards, rollers, etc) finalised with OEMs to mitigate sudden failures & improve safety.

  25. UPGRADING PERFORMANCE REQT. For Phase – 3 Elevators :- • Lifts to be designed for One Million operations/ Year • Doors to be suitable for 4 Million Operations/ Year Design is in progress and it is observed that Elevator Door manufacturers have different door models / products based on Number of Door Operations (duty cycle) required. Leading Elevator door manufacturers are – Fermator, Spain Wittur, Germany Sematic, Italy

  26. ARRANGEMENT OF DOOR HEADER

  27. CRITICAL DOOR COMPONENTS Based on inputs from Elevator door manufacturers, selection of following components depends on Duty Cycle:- • Track thickness and profile, • Diameter of Door Rollers, (> 60 mm) • Synchronisation rope, (min 3.0 mm) • Door contacts, (IP 20 / 54 / 67) • Door guide shoes / sliders. Manufacturers advised to submit Endurance Test Reports and prepare Predictive Replacement Plan.

  28. WAY FORWARD • CLIENT should be Vigilant & Demanding, • Developing Facilities for Testing and Certification of sub-systems / components. • Quality Control during Installation, • Periodic Maintenance • Strengthening of Legal Framework.

  29. THANKS

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