Thread: What do YOU think happened to Building 7 ? Shorten URL

7 World Trade Center - Wikipedia, the free encyclopedia

On September 11, 2001, 7 WTC was damaged by debris when the nearby North Tower of the WTC collapsed. The debris also ignited fires, which continued to burn throughout the afternoon on lower floors of the building. The building's internal fire suppression system lacked water pressure to fight the fires, and the building collapsed completely at 5:21:10 pm.[1] The collapse began when a critical column on the 13th floor buckled and triggered structural failure throughout, which was first visible from the exterior with the crumbling of the east mechanical penthouse at 5:20:33 pm.

As the North Tower collapsed on September 11, 2001, heavy debris hit 7 World Trade Center, causing damage to the south face of the building.[29] Structural damage occurred to the southwest corner between Floors 7 and 17 and on the south face between Floor 44 and the roof; other possible structural damage includes a large vertical gash near the center of the south face between Floors 24 and 41.[8] The building was equipped with a sprinkler system, but had many single-point vulnerabilities for failure: the sprinkler system required manual initiation of the electrical fire pumps, rather than being a fully automatic system; the floor-level controls had a single connection to the sprinkler water riser; and the sprinkler system required some power for the fire pump to deliver water. Also, water pressure was low, with little or no water to feed sprinklers.

This is what I believe.


What do YOU think ?

^ --- what he said.

+1 to this.