(May 2, 2012 at 12:05 am)Shell B Wrote: Jackman, at that heat, the water would evaporate very rapidly. Even as a cook, I saw plenty of evidence of that. My cooking surfaces often got red or white hot. It takes a substantial amount of water to stop it from heating up quickly. Just think of the cooling systems in engines. If water were really that much of a coolant, we could just pour water on our engines on long road trips. As it is, water cooled engines rely on the intake of water, not just a splash or a filler up. Hence the reason why certain boat motors that have been in fresh water need to be drained at a different temperature than those that have been in salt water when the weather gets cold, to prevent it from cracking.
As for the insulation, my understanding is that it was destroyed on impact. We have to remember that there was not just a fire or just a collision. There was a combination of both. We also have to take into account the amount of heat that would be generated by the collapse. Even bending metal rapidly makes it warm. Friction also causes it to heat up. Therefore, we have steel beams compromised to at least some degree by the impact, then the fire then the collapse itself to account for the structural compromise. As the top floors came down, they also generated plenty of heat and pushed the heat of the fire and its own friction/twisting down.
They were exceptional buildings. However, as is the case with so many things, everything about it was public knowledge. The individuals who took it down knew where to hit it. Being a terrorist does not mean you are stupid.
shell, you make very good points. but to say water evaporates at that heat, it depends on how much water is on those floors within the pipes that are supplying the sprinklers. if you have 1" pipe going up a 10' floor height, there may be 20 different sprinkler runs (no clue, as i haven't looked at the drawings for the buildings). there will be a lot of water sitting on that floor to be evaporated, considering the pressure would be upwards of 70psi to get up that high in a building and still be enough to disperse properly to squelch a fire. so much water there and much more pressure spraying water out - it won't evaporate very quickly. especially the stuff that soaks into the office furniture, carpet, insulation, etc...
the insulation being destroyed on impact. i heard that too, i just don't buy it. it's not like knocking a picture off a wall when you bump the wall from the adjacent room. that stuff has a bonding agent that ties it to the metal. it doesn't scrape off easily with a concerted effort and a chisel. but, who knows, maybe it well could have. i can't say for sure because i don't know what happened to shards of the plane as it entered the buildings.
i don't believe terrorists are stupid at all. i just wonder who the real terrorists are sometimes.
they can land a rover on mars, yet they still have to stick a human finger up my ass to do a prostate exam?! - ricky gervais