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vertexeng.com...
WHAT HAPPENS TO STEEL DURING A FIRE?
Physical and material property changes occur within the structural steel framing during a fire event. Thermal elongation, strength reduction, and a reduction in stiffness can occur. Due to the property changes deformations and buckling can occur at 600°F. If a structural steel framing member, such as a beam or girder, is completely constrained at its connections, deformation and buckling can occur as low as 250°F. Typically though buckling of the member occurs around 1,300°F due to the 50% reduction in strength and stiffness (Depicted in the graphs above).
“FIREPROOFING” AT THE WTC TOWERS
www.fireengineering.com...
I investigated the fireproofing in both World Trade Center towers over approximately a 10-year period between the early 1990s and early June 2000, the last time I was in the towers.
There were problems with the fireproofing in the World Trade Towers that may have rendered them vulnerable to fire. These problems are not unique to the WTC; I have observed similar problems with the
the engine from Boeing 747.
Explaining the 9/11 Murray St Engine from Flight 175 (N612UA) that hit WTC2
www.metabunk.org...
Post 3
Well that was quick I think the above image pretty much proves that even if the 767 had a JT9D-7R4D then the TOBI duct looks like this . I await objections.
LOL, the official narrative collapsed on its own
Explaining the 9/11 Murray St Engine from Flight 175 (N612UA) that hit WTC2
www.metabunk.org...
Post 3
Well that was quick I think the above image pretty much proves that even if the 767 had a JT9D-7R4D then the TOBI duct looks like this . I await objections.
nuclear events at WTC.
originally posted by: neutronflux
a reply to: nerbot
Like as most people at the time had to use a single vhs tape for multiple shots throughout the day. Or something along those lines?
Camera phone
en.m.wikipedia.org...
The first commercial camera phone was the Kyocera Visual Phone VP-210, released in Japan in May 1999.[91] It was called a "mobile videophone" at the time,[92] and had a 110,000-pixel front-facing camera.[91] It stored up to 20 JPEG digital images, which could be sent over e-mail, or the phone could send up to two images per second over Japan's Personal Handy-phone System (PHS) cellular network.[91] The Samsung SCH-V200, released in South Korea in June 2000, was also one of the first phones with a built-in camera. It had a TFT liquid-crystal display (LCD) and stored up to 20 digital photos at 350,000-pixel resolution. However, it could not send the resulting image over the telephone function, but required a computer connection to access photos.[93] The first mass-market camera phone was the J-SH04, a Sharp J-Phone model sold in Japan in November 2000.[94][93] It could instantly transmit pictures via cell phone telecommunication.[95]
Cameras on cell phones proved popular right from the start, as indicated by the J-Phone in Japan having had more than half of its subscribers using cell phone cameras in two years. The world soon followed. In 2003, more camera phones were sold worldwide than stand-alone digital cameras largely due to growth in Japan and Korea.[96]
Category:Mobile phones introduced in 2001
Pages in category "Mobile phones introduced in 2001"
The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes (learn more).
E
Ericsson T66
N
Nokia 6310
S
Samsung SGH R220
Samsung SGH-T100
Samsung SPH-i300
Siemens ME45
Siemens S40
Siemens S45
Siemens SL45
Sony Ericsson T68
Sony Mobile
originally posted by: neutronflux
a reply to: Salander
You
the engine from Boeing 747.
Wrong.
edit on 14-3-2022 by JetRanger because: formatting
edit on 14-3-2022 by JetRanger because: formatting
originally posted by: Moohide
a reply to: Blue_Jay33
I'm sure i'v seen this video in the past, about 10-12 years ago maybe.
.
originally posted by: Flyingclaydisk
originally posted by: pheonix358
a reply to: Blue_Jay33
Notice the fuel explosion is external to the building?
If you count the windows you can get a size for the two fireballs. That is the fuel going up, being pushed out of the building.
So much for jet fuel running down on the inside of the building.
Great video.
P
Well, the reason you don't see fire 'inside' the building right away is the impact and resultant explosion immediately exhausted (blew) all the accelerant (air) out of the inside of the building creating a vacuum. So, yes, there likely was thousands of gallons of JET-B running down inside the building (i.e. stairwells and elevator / mechanical shafts). The second reason is the JET-B fuel used in commercial aviation is not particularly flammable unless it is atomized. The impact atomized tons of fuel instantaneously, and it exploded into a giant fireball outside the building, but much of the atomized fuel quickly returned to a liquid state in the accelerant poor atmosphere inside the building due to the negative pressure, so it didn't catch fire until 'much' later.
Incidentally, these same concepts are used to control fires inside buildings by using the HVAC systems; they pressurize areas above and below the fire and exhaust areas at the site of the fire (creating a vacuum). This prevents the spread of a fire longer, giving fire fighters time to begin fire suppression efforts. Now, obviously with a massive incident like 9-11, the HVAC systems were powerless to do anything, but the sheer impact of the crash itself created the vacuum in 1-WTC and subsequently 2-WTC.
Once the temperature of the residual fire from the crash inside the building rose above the flashpoint of the liquid JET-B fuel, then it ignited several minutes after the impact, but not immediately upon impact. This is what you are seeing. You see the impact, and the immediate fireball, then lots of smoke. When the smoke clears you see a giant hole in the corner of 2-WTC, the 2nd tower, but no significant fire like what has developed in 1-WTC (the 1st tower to be hit) 18 minutes prior. Several minutes after this you see a growing fire start to engulf the areas above and below the 80th floor down to 77 and up to 85.
No sinister conspiracies here, just the natural progression of fires following an explosion.
BTW - These same concepts are also why explosives are used to control oil well fires. The explosions evacuate all the accelerants away from the wellhead, so the fire is starved for oxygen for a period of time. This window allows for the well to be sealed so when the oxygen, and subsequent fire return, the fuel source has been shut off and the fire is eventually extinguished.