Ethan Liu · Elevator Specialist

Expert Q&A

• 【Cause】Problems that are often overlooked in daily engineering workI am elevator specialist (Ethan Liu). The "issues commonly overlooked in routine engineer…
• Insufficient guest elevator capacity at a five-star hotel causes excessively long waiting times during peak periods, affecting the guest check-in experience and operational efficiency.【Cause】Insufficient traffic flow analysis was conducted during the architectural design p…
• Hotel freight elevators and passenger elevators were selected interchangeably, causing inconvenience in transporting linen carts and food service carts and affecting passenger ride comfort.【Cause】During hospital construction, the technical requirements for medical elevators and…
• Insufficient reserved dimensions for the elevator shaft or verticality deviation exceeding the limit, resulting in difficult elevator installation and excessive operational vibration.【Cause】The elevator model and brand were not specified during civil engineering design, a…
• The intelligent elevator control system is incompatible with the elevator's original control system, resulting in abnormal functions or frequent system crashes.【Cause】The intelligent elevator access control supplier failed to obtain the elevator man…
• Elevator maintenance is perfunctory and not carried out according to the items specified in TSG T5002, resulting in frequent elevator failures.【Cause】To reduce costs, the maintenance contractor shortens maintenance time (normally 2 …
• The elevator speed governor–safety gear linkage device has failed, posing a major safety hazard of car fall.【Cause】The maintenance contractor has not tested the governor–safety gear linkage functio…
• Glass self-explosion or seal failure and water ingress in the glass shaft of outdoor panoramic elevators under extreme weather conditions【Cause】The selected glass does not comply with the tempered laminated safety glass standa…
• After the destination floor reservation system DCS was put into use, passengers did not accept it, the utilization rate was low, and congestion actually increased during peak periods.【Cause】Lack of usage guidance and transition period management; unfriendly touchscreen in…
• Uneven tension in elevator wire ropes intensifies operational vibration, accelerates wire rope wear, and poses a risk of rope breakage.【Cause】Improper tension adjustment during installation; different elongation of each rope…
• Failure of the fire elevator drainage facilities caused firefighting water to backflow into the hoistway during a fire, resulting in a short circuit and shutdown of the elevator.【Cause】The drainage pump's start stop function was not tested regularly; the drainage sum…

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