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Posted 2010-08-06, 03:31 PM
in reply to D3V's post starting "Yes, the building fell in 6.5 seconds,..."
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If actually read what the link points to, it doesn't say anything about it being "only" fire.
First paragraph said:
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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.[4] The bottom portion of the building's south face was damaged by debris, including damage to the southwest corner from the 8th to 18th floors, a large vertical gash on the center-bottom extending at least ten floors, and other damage as high as the 18th floor.[4] 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.
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