From Dark Fire:
(their theory of what precipitated the collapse of Bldg. 7)
Many fires in the area went unchecked because utility power for electrical pumps, and water pressure for fire engines had either diminished or been lost.
This is what happened.
A Pumped Oil Spill
The debris fall ripping into the southwest corner ruptured the oil pipes of the SSB pressurized fuel distribution system. Operating as intended — the lack of utility power triggering the “need”, and the lack of pressure due to a severed pipe signaling the “demand”, the SSB system pumped oil up from its 12,000 gallon basement reservoir, maximally with a pressure of 50 psi (pounds per square inch) and flow rate of 75 gpm (gallons per minute), onto Floor 5.
Pumping would have started at 9:59 a.m., when Con Ed cut utility power to WTC 7; and the spilling would have started a half hour later when the pressurized pipe was cut. The SSB pumps could have drained the two 6,000 gallon tanks in 2 hours and 40 minutes. Engineers from the New York State Department of Environmental Conservation found that “there was a maximum loss of 12,000 gallons of diesel from two underground storage tanks registered as 7WTC.” (10)
When the pressurized pipe was cut by falling debris and the “spilling” began, the emergency generators would then of course be deprived of fuel and would in short order stop operating.
Without grid or emergency back-up power, how could these pumps continue to operate and fuel this fire with diesel fuel from these 12,000 gallon underground storage tanks?
Additionally, “Both tanks were found to be damaged by debris and empty several months after the collapse. Some fuel contamination was found in the gravel below the tanks and the sand below the slab on which the tanks were mounted, but no contamination was found in the organic marine silt/clay layer underneath.”
Pulled up by the emergency pumps, the SSB diesel fuel went , from the 6,000 gallon storage tanks, under the loading dock, under the southwestern part of the building, to floor 5.
It may all have been pumped out by 1 p.m., or it may have been pumped out at a rate as low as 29 gpm for 7 hours. Since this fuel was absent from the wreckage, it was burned. You can see it as the huge plume of black smoke rising from the World Trade Center, in panoramic photographs of that day. Diesel fuel can supply 2.13 MW of power per gpm given an air supply of 1333 cfm (cubic feet per minute). (11)
“Pulled up by the emergency pumps…….” doesn’t seem plausible as there would have been no electrical power whatsoever to the building at this point and it doesn’t make any sense at all for these pumps not to be powered by the electricity produced by at least one of the generators that they would be providing this diesel fuel for._
Dark Fire is a loser as a plausible explanation for the collapse of Bldg. 7.