Elevator Entrapment Accidents Shock the Industry
-The Choice of Wire Rope Material Becomes a Safety Focus
On August 15, 2025, an elevator entrapment accident at a high-rise apartment building in Manhattan, New York, drew significant attention.
An 18-year-old elevator experienced a sudden wire rope failure, trapping three passengers for nearly two hours. While no one was injured, the incident prompted the American Society of Mechanical Engineers (ASME) to hold an emergency meeting of experts to discuss updating elevator wire rope safety standards, which haven't been revised in 20 years. The accident brought the long-standing debate over the "choice of wire rope material" back into the spotlight.
In-depth Accident Investigation: Aging Cables and Failed Inspections
According to the preliminary investigation report released by the New York City Department of Buildings (DOB):
1. The elevator involved used a traditional 6x19 steel-core wire rope, which had exceeded the manufacturer's recommended 15-year replacement cycle.
2. The point of failure showed multiple signs of corrosion and metal fatigue cracks, yet the most recent inspection report stated "good condition."
3. Maintenance records indicated that only routine lubrication had been performed in the past three years, with no non-destructive testing conducted.
"This is not an isolated case," stated David Wilkins, chairman of the ASME Elevator Safety Committee. "Approximately 23% of high-rise building elevator wire ropes across the U.S. are operating past their service life, and traditional visual inspection methods can no longer meet safety requirements."
The Material Revolution: The Rise of Carbon Fiber Ropes
Following the accident, several major elevator manufacturers have accelerated the development of alternative materials:
| Pros | Cons | |
|---|---|---|
| Traditional Steel-Core Wire Rope | Low cost (approximately $15/meter), high tensile strength. | Prone to corrosion (especially in coastal cities), high self-weight (increases elevator energy consumption). |
| Carbon Fiber Composite Rope | 60% lighter, completely corrosion-proof, lifespan can reach 25 years. | Current price is high at up to $120/meter, requires a special process for end connections. |
"The fatigue failure mode of carbon fiber ropes is completely different from that of steel," explained Dr. Emily Chen of the MIT Materials Lab. "It won't fail suddenly. Instead, it will first show visible fiber delamination, giving maintenance personnel a much longer warning time."
Industry Response: A Two-Fold Transformation of Standards and Market
Standards Upgrade: The ASME plans to include specific provisions for composite ropes for the first time in its A17.1-2026 standard.
Inspection Technology Upgrade: A well-known company has launched a "Wire Rope AI Diagnostic Device" that can detect internal damage through electromagnetic scanning.
Policy Push: New York City plans to pass legislation requiring non-destructive testing for all elevators older than 10 years.
Chinese Market Dynamics
Data from the China Special Equipment Inspection and Research Institute shows:
1. Elevator wire rope-related accidents increased by 12% year-over-year in the first half of 2025.
2 . The "Elevator Wire Rope Scrapping Standard" (GB/T 5972-2025) will be implemented in October. For the first time, it explicitly mandates "compulsory scrapping if corrosion leads to a diameter reduction of 7%."
As the production costs for carbon fiber continue to fall, there's a widespread industry belief that the next five years will be a transitional period where both steel and carbon fiber ropes coexist. However, the widespread adoption of intelligent inspection methods is an irreversible trend.
"Not every elevator needs to switch to carbon fiber ropes immediately," emphasized Zhang Lexiang, Secretary-General of the China Elevator Association. "But for critical locations like coastal cities and hospitals, this investment is well worth it. What we really advocate for is the creation of a 'digital health record' for every wire rope."