Height: 1,483 ft (452 meters) Owners: Kuala Lumpur City Centre Holdings Sendirian Berhad Architects: Cesar Pelli & Associates Engineers: Thornton-Tomasetti Engineers Contractors: Mayjus and SKJ Joint Ventures Topping Out: 1998 Official Opening: August 28, 1999
The Petronas Twin Towers (also known as the Petronas Towers or Twin Towers), in Kuala Lumpur, Malaysia are the world's tallest twin buildings.
Tower One is fully occupied by the Petronas Company and a number of its subsidiaries and associate companies. The office spaces in Tower Two are mostly available for lease to other companies. A number of companies have offices in Tower Two, including Accenture, Al Jazeera English, Bloomberg, Boeing, IBM, Khazanah Nasional Berhad, McKinsey & Co, TCS, Krawler Networks, Microsoft,, Newfield Exploration and Reuters.
Skybridge
The towers feature a skybridge (constructed by Kukdong Engineering & Construction) between the two towers on 41st and 42nd floors, which is the highest 2-story bridge in the world. The bridge is 170m above the ground and 58 m long, weighing 750 tons. The same floor is also known as the podium, since visitors desiring to go to higher levels have to change elevators here. The skybridge is open to all visitors, but free passes (limited to 1700 people per day) must be obtained on a first-come, first-served basis. The Skyway is closed on Mondays. Visitors are allowed to go only on the 41st floor as the 42nd floor is used only by the tenants of the building.
The skybridge also acts as a safety device, so that in the event of a fire or other emergency in one tower, tenants can evacuate by crossing the skyway to the other tower. However, the total evacuation triggered by a bomb hoax on September 12, 2001 (the day after the September 11 attacks destroyed the Twin Towers of the World Trade Center in New York City) showed that the bridge would not be useful if both towers need to be emptied simultaneously, and the capacity of the staircases was insufficient for such an event. Plans thus call for the elevators to be used if both towers need to be evacuated, and a successful drill following the revised plan was conducted in 2005.
Elevator system
The main bank of Otis elevators is located in the center of each tower. All main elevators are double-decker with the lower deck of the elevator taking passengers to odd numbered floors and upper deck to even numbered floors. In order to access an even numbered floor from ground level, passengers are required to use an escalator to access the upper deck of the elevator.
From the ground floor there are three groupings of elevator. The "short haul" group of 6 elevators take passengers to floors between level 2/3 and level 16/17. The "mid haul" group of 6 elevators take passengers to floors between level 18/19 and level 37/38. There is also a set of shuttle elevators that take passengers directly to levels 41/42. In order to get to levels above 41/42, passengers are required to take the shuttle elevators and then change elevators to the upper floors. These connecting elevators are placed directly above the elevators serving levels 2 to 38. The pattern now repeats with the upper levels, one set serving levels 43/44 to 57/58 and one set serving levels 59/60 to levels 73/74.
Apart from this main bank of elevators, there are a series of "connecting" elevators to take people between the elevator groupings. Unlike the main elevators, these are not of the double-decker type. Two elevators are provided to take people from levels 37/38 to levels 41/42 (levels 39 and 40 are not accessible as office space). This avoids the need for someone situated at the lower half of the building to go down to the ground floor in order to gain access to the upper half of the building.
The elevators contain a number of safety features. It is possible to evacuate people from an elevator stuck between floors by manually driving one of the adjacent elevators next to it and opening a panel in the wall. It is then possible for people in the stuck elevator to walk between elevator cars.
During an evacuation of the buildings the shuttle elevator is allowed to be used. This is because there are only doors at levels G/1 and levels 41/42 therefore should there be a fire in the lower half of the building, this enclosed shaft would remain unaffected.
