Thinking about this PEMEX incident more. 12 inch duct pipeline bursts/ruptures (was it complete instant failure or has it been gradual over a period of time?), the pressure created the column from the 100m/300ft depth. The column of gas would continue to be linear because they…
Closed the valves, ESD the platform and then would have blown down the pipeline to remove the gas in the system, to completely depressurise it *could* take several hours (fire reportedly burnt for around 5 which could align), eventually the blow down would have been neutralised
By the sea pressure at 100m/300ft depth, the fire itself would have extinguished at that point as gas would have stopped and the surface fire would die out. The vessels pumping water weren’t trying to put out the fire they were disrupting the water to keep the gas in a central
Place so that it could be kept in a controlled manner, probably helped by the blow out creating a column of gas up to the surface. Still not sure on the ignition source however.
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