Citat:
Ursprungligen postat av
putteibla
"The National Institute of Standards and Technology (NIST) has had considerable difficulty determining a politically correct sequence of events for the unprecedented destruction of three World Trade Center (WTC) buildings on 9/11. But despite a number of variations in NIST’s story, it never considered explosives or pyrotechnic materials in any of its hypotheses. This omission is at odds with several other striking facts; first, the requirement of the national standard for fire investigation (NFPA 921), which calls for testing related to thermite and other pyrotechnics, and second, the extensive experience NIST investigators have with explosive and thermite materials."
Då får du nog läsa NFPA 921 lite bättre. Här kan du hämta den:
http://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=921
For its study of WTC 7, why didn’t NIST follow the National Fire Protection Association (NFPA) guidelines for conducting a fire investigation?
NFPA 921, “Guide for Fire and Explosion Investigations,” is a recommended methodology for optimizing investigations. NFPA 921 acknowledges that each investigation is unique, and that some investigations will require broader procedures than it can accommodate. This was especially true for NIST’s WTC investigation, which responded to events that were much more than typical fires or explosions.
However, NIST’s WTC 7 investigation did follow the core tenet of NFPA 921, which is the application of the scientific method. The investigation was carefully planned, sources of information were identified and contacted, the building fire and collapse event and the investigation were documented, available evidence was obtained (including documents about the design and construction of the structure), and the origin of the fire was determined based on images, laboratory testing (conducted for the towers, but applicable to WTC 7), and mathematical analyses.
Additionally, in its study of WTC 7, NIST considered all available data and evaluated a range of possible collapse mechanisms: uncontrolled fires on the tenant floors, fuel oil fires, hypothetical blast events, and fires within the Con Ed substation. NIST developed a working hypothesis, modeled the fires and the building, and then used the models to test the hypothesis against the observed behavior of the building. This approach is fully consistent with the principles of scientific inquiry.