9/11 - WTC/Pentagon/Shanksville m.m - Tråd Nr 2

"Building #7 was still actively burning and at that time we were advised by a NYFD Chief that building #7 was burning out of control and imminent collapse was probable. –PAPD P.O. Edward McQuade"

...Just when you thought it was over, you're walking by this building and you're hearing this building creak and fully involved in flames. It's like, is it coming down next? Sure enough, about a half an hour later it came down. –FDNY Lieutenant James McGlynn

The concern there again, it was later in the afternoon, 2, 2:30, like I said. The fear then was Seven. Seven was free burning. Search had been made of 7 already from what they said so they had us back up to that point where we were waiting for 7 to come down to operate from the north back down. –Captain Robert Sohmer

Then we had to move because the Duane Reade, they said, wasn't safe because building 7 was really roaring. –FDNY Chief Medical Officer Kerry Kelly.

The time was approximately 11a.m. Both of the WTC towers were collapsed and the streets were covered with debris. Building #7 was still standing but burning. ...We spoke to with a FDNY Chief who has his men holed up in the US Post Office building. He informed us that the fires in building 7 were uncontrollable and that its collapse was imminent. There were no fires inside the loading dock (of 7) at this time but we could hear explosions deep inside. –PAPD P.O. William Connors

Firefighter TJ Mundy: "The other building, #7, was fully involved, and he was worried about the next collapse."

Chief Nigro directed me to continue monitoring conditions at the site. Specifically to monitor number 7 World Trade Center. We were very concerned with the collapse potential there, and to do whatever I could do to ensure site safety in that no additional people became injured. –FDNY Deputy Chief Harold Meyers

It could have been an hour, hour and a half we were doing that before we were ordered to move away from that part of Tower No. 1 because there was an imminent danger of collapse of World Trade Center No. 5 and 7. –Firefighter Vandon Williams

All later attempts to return to the WTC were stopped by the pending, and eventual collapse of Building 7 and the uncontrolled fires. –PAPD P.O. Lawrence Guarneri

We were concerned that the fires on several floors and the missing steel would result in the building collapsing. So for the next five or six hours we kept firefighters from working anywhere near that building, which included the whole north side of the World Trade Center complex. – Chief Frank Fellini

They backed me off the rig because Seven was in dead jeopardy, so they backed everybody off and moved us to the rear end of Vesey Street. We just stood there for a half hour, 40 minutes, because Seven was in imminent collapse and finally did come down. – Firefighter Thomas Smith

"The most important operational decision to be made that afternoon was the collapse had damaged 7 World Trade Center, which is about a 50 story building, at Vesey between West Broadway and Washington Street. It had very heavy fire on many floors and I ordered the evacuation of an area sufficient around to protect our members, so we had to give up some rescue operations that were going on at the time and back the people away far enough so that if 7 World Trade did collapse, we wouldnít lose any more people."

How hot did WTC 7's steel columns and floor beams get?

Due to the effectiveness of the spray-applied fire-resistive material (SFRM) or fireproofing, the highest steel column temperatures in WTC 7 only reached an estimated 300 degrees C (570 degrees F), and only on the east side of the building did the steel floor beams exceed 600 degrees C (1,100 degrees F). However, fire-induced buckling of floor beams and damage to connections-that caused buckling of a critical column initiating collapse-occurred at temperatures below approximately 400 degrees C where thermal expansion dominates. Above 600 degrees C (1,100 degrees F), there is significant loss of steel strength and stiffness. In the WTC 7 collapse, the loss of steel strength or stiffness was not as important as the thermal expansion of steel structures caused by heat.