The sensors were most likely not flow sensors, but low pressure sensors.
The fire pumps should have activated when the system lost pressure through the broken lines. RE: Miami Beach, Champlain Towers South apartment building collapse, Part 05 Phil1934 (Geotechnical) 10 Jul 21 18:46 This event would have caused two loud crashing sounds, one when the penthouse roof collapsed onto the roof of floor 12 below, and one when the air conditioning units fell and crashed into the deck below along with sections of the penthouse roof parapet and the green tote bag carrying heavy roofing materials left on the roof overnight by the workers. This event would have happened before the TikTok video was taken seven minutes before the collapse of the entire building, and probably seven minutes before the entire pool deck collapsed. I believe that these objects slid off the penthouse roof when the roof tilted as a result of the rebars holding the penthouse roof to the front columns were weakened by drilling holes for anchor installation and gave way later during the night as the weaker penthouse roof was heavily loaded with air conditioning units, anchor materials, and roof repairing materials. I join with warrenslo in believing that the green object is a carrying bag used by the crane to lift materials to the rooftop that was left on the rooftop overnight (see photo below). I believe that the rectangular object beside it may be another air conditioning unit and the two rectangular objects adjacent to it may be portions of the parapet for the penthouse roof. The color even matches the light color of some of the air conditioning units (see photo below). I believe that the round object inside the squarish frame near column 27 is an air conditioning unit originally installed on the penthouse roof over the middle section of the building. le has also speculated that the green object is a planter from outside room 111. SFCharlie has speculated that the round object is a washing machine, and JS5180 that is a ventilation fan. le has speculated that the round object inside the squarish frame near column 27 and the second rectangular object to its right are an SUV (possibly a Ford Explorer) positioned head in to parking space 27 that knocked down the column behind it.
We see a round object inside a squarish frame near column 27 beside a second rectangular object and what appears to be two portions of a broken column. If we now look at the frame of the TikTok video that Sym P. This would have caused the two columns K10 and L10 to punch through the pool deck, initiating the fall of the center section, which then caused more of the pool deck to fall as a result of the loading from the collapsing building. After toppling over, they probably rolled downward into the parapets, crashing through the parapets along with the green bag of roofing materials, and then falling further to the deck below right in front of the three critical columns holding up the middle section building. This amount of tilt would have caused some of the air conditioning units to topple over because they are already top-heavy as a result of their motors being near the top of the units and placing them even higher on raised metal frames would have caused their centers of gravity to extend over the footing of the frames. This would have caused the penthouse roof to tilt down at about a 20° angle (see photo). Building on the narrative that warrenslo and Dold have elaborated, I believe that as a result of penthouse roof weakening induced by the recent installation of anchors close to column tops that may have compromised the rebar underneath and the additional load of roofing materials added to the already critical load of air conditioning units, the penthouse roof may have given way at the front causing the parapet for the penthouse roof over the middle section of the building to crash down behind the parapet for the 12th floor roof, leaving the rear part of the penthouse roof attached like a hinge. The parapet for the penthouse roof over the middle section of the building appears to be missing while the parapet for the roof of the 12th floor remains. In the first frame of the surveillance video, the center of the building had already dropped down 2 to 3 floors.
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