Those gas incinerator stacks are 25 feet tall from top to bottom.
We were displacing 310 PSI (pounds per square inch) of gas through 4" flare line (4" metal pipe) to the four incinerators shown. The gas launches up into the incinerators, where it mixes at roughly 40% gas to 60% oxygen per incinerator, and roars into the night sky like upside-down rockets... it's hypnotizing to watch, but the heat is intense even 40 feet away, the roar is deafening, and the ground shakes. Exhilarating!