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Another series of tests sought to address the alleged weakening of the WTC support columns. During a first-run investigators placed an uninsulated steel column in a 2,012ºF (1,100ºC) furnace and measured the rise in its surface temperature. Notice, this laboratory furnace was significantly hotter than the fires on 9/11 caused by jet fuel or any other combustible in the WTC. The column reached 600ºC in just 13 minutesthe temperature range where significant loss of strength occurs. When the test was repeated again with an insulated column, the steel did not reach 600ºC even after ten hours. The NIST concluded that "the fires in WTC 1 and WTC 2 would not be able to significantly weaken the insulated....columns within the 102 minutes and 56 minutes, respectively, after impact and prior to collapse."[my emphasis]
The NIST interpreted these results as validating its favored hypothesis that the critical factor on 9/11 leading to the global failure of the WTC's support columns was the damage to the fireproofing insulation caused by the Boeing 767 impacts. But was this an unwarranted leap? It certainly was not supported by the NIST's metallurgical analyses, which showed that not even one of the 236 steel samples, including those from the impact areas and fire-damaged floors, showed evidence of exposure to temperatures in excess of 1,110ºF (600ºC) for as long as 15 minutes. In fact, out of more than 170 areas examined on 16 recovered perimeter columns, only 3 reached temperatures in excess of 250ºC (450ºF) during the fires. And why ? Well, perhaps, in part, because, as Shyam Sunder, the lead NIST investigator, admitted, "the jet fuel....burned out in less than ten minutes." Also, NIST scientists made another surprising discovery: The actual amount of combustibles on a typical floor of the WTC turned out to be less than expected, only about 4 lbs./sq. foot. Furthermore, "the fuel loading in the core areas....was negligible." The shocking fact is that the World Trade Center was fuel-poor, compared with most other buildings. The NIST estimated that a fire in a typical area of the building would have burned through the available combustibles at maximum temperatures (1,000ºC) in about 15-20 minutes. Not nearly long enough even at that temperature to cause exposed steel to lose 80% of its strength.
Nor is this all. I searched the NIST report in vain for any acknowledgment that here, as in the case of the truss assembly test, the actual fire conditions on 9/11 were substantially different from the UL laboratory furnace. In fact, with respect to the columns the differences were at least as significant as with the truss assembly test, and call into sharp question the NIST's conclusion that damaged insulation was the critical factor. Although the NIST took the position that "temperatures and stresses were high in the core area," as I've noted the investigation suffered from a persistent lack of information about real conditions at the core. The NIST had no hard evidence about the actual amount of protective insulation damaged/dislodged during the impacts. The NIST report acknowledges this, then goes on to assume that all structural members in the debris path at the time of impact suffered 100% loss of insulation. Surely, we are safe to conclude that the Boeing 767 impacts did cause damage to, or strip away, a substantial portion of the fireproofing material. Exactly how much is not knowable. But even if the NIST estimate of total loss of fireproofing is correct, there is virtually no chance that the fires on 9/11 weakened the WTC's core piers within the allotted span of time: 56/103 minutes.
A Vast Heat Sink
The reason for this, nowhere acknowledged in the NIST report, ought to be obvious: The WTC's support columns did not exist in isolation. This was no laboratory furnace. The columns in each tower were part of an interconnected steel framework that weighed at least 100,000 tons; and because steel is known to be an excellent conductor of heat this massive steel superstructure functioned on 9/11 as an enormous energy sink. The total volume of the steel framework was vast compared with the relatively small area of exposed steel, and would have wicked away the fire-caused heat almost as quickly as it was generated. Anyone who has repaired a copper water pipe with a propane torch is familiar with the principle. One must sit and wait patiently for the pipe temperature to rise to the point where the copper finally sucks the solder into the fitting. While it is true that copper is more conductive than steel, the analogy holds, regardless. The fact that only three recovered steel samples showed exposure to temperatures above 25
Originally posted by Varemia
why would people ever occupy such a building, knowing such and presume it was a predictable and someone knew it had a huge flaw,
WTC 7 was hit by a bunch of debris from WTC 1. No building is designed to have another building land on it.
Originally posted by earthinhabitant
reply to post by Varemia
that was just from 1 of 1500...that were not on the take and even you hopefully can see the discrepancies, issues and conclusions in the NIST report is theory and subject to conjecture by the experts critiquing it...not just you and those who wrote it and promote it, so was not just one person, this is like 1500 to 1, your one being NIST.
100s upon 100s of scientists & engineers have reached similar conclusions. Formed A&E for 911 Truth in 2007, Scientists for 911 Truth in 2010.
The Beijing Mandarin Oriental Hotel Fire
The Hotel Mandarin Oriental blazes
The most recent example of a spectacular skyscraper fire was the burning of the Hotel Mandarin Oriental starting on February 9, 2009. The nearly completed 520-foot-tall skyscraper in Beijing caught fire around 8:00 pm, was engulfed within 20 minutes, and burned for at least 3 hours until midnight. Despite the fact that the fire extended across all of the floors for a period of time and burned out of control for hours, no large portion of the structure collapsed.
Originally posted by ANOK
The whole NIST report hinges on a false premise, that sagging trusses can pull in columns.
Why should we give any of it any credence?
edit on 5/17/2012 by ANOK because: (no reason given)
o Lt. Col. Robert Bowman, PhD in Aeronautics and Nuclear Engineering, served as Director of Advanced Space Programs Development under Presidents Gerald Ford and Jimmy Carter: "...the official conspiracy theory of 9/11 is a bunch of hogwash. It's impossible."
Originally posted by earthinhabitant
VAr, oh you went and called in a mod to stop the quotes, as that is just as expected from those who cannot handle the truth and want to hide it and cover it up, still does not make your source any more credible and in fact, makes it even less in my book and you.
Rival list may need a member added to it...edit on 17-5-2012 by earthinhabitant because: (no reason given)
Originally posted by usernameconspiracy
World Trade Center Building 7?