Reply #95: This is where we disagree

[LARED]

If the WTC buildings were designed for 100% coverage then 100% of the building has to be able to operate for whatever time they have specified.

After perusing NFPA13 it is clear to me this is not true. Part of the design process is to determine the area of application. It makes no sense to provide water to all 110 floors over ever square foot of sprinkled area. There is no possibility the building will spontaneously catch fire over that much area.

If you used 0.15 gpm per sqft, you have 110 floors at 40,000 sqft per floor gives over 500,000 GPM. Where is the city going to get 500,000 gpm for thirty minutes without losing pressure? Nowhere!

The NIST is stating the fire protection system was not designed to fight a fire as large as the one on 9/11, the supply system was damages and ultimately the fire system did little to mitigate the fires. I agree.

Here's the schematic of the fire protection system.