joe,
1) it was a 3 million tank of fuel, not a bucket.
2)its under pressure, a simple pressure valve can dump huge amounts of vapour, maybe air was allowed into the tank, maybe it was empty for maintenance and it was 99% vapour, who knows, we wont until an enquiry, and im likly to know alot of stuff that wont get released because of contacts at these places (hell i practicly live next to it)
as for fire fighting, put it like this,
potentialy 60 million gallons of fuel + water = floating fire, enviromental damage+ no effect = pointless
potentialy 60 million gallons of fuel + a few 100 gallons of foam = limited effect+ re ignition of what you have just put out = pointless + waste of reasources
their plan of attack = let some burn off (its a massive fire) and keep all the tanks surronding cool with water. + order foam from across the country and internationally dilute this with a few million gallons of water from the canal (not far) to produce HUGE quantitys of the stuff, when this is all ready to go, get every nozzel you can aimed at the fire and go in all guns blazing, starve the fire of oxygen and dont stop til its all used = cool area, fire starved, oil cooled= fire out and chances of re-ignition minimal
nothing suspicious about it apart from the order in which the tanks are burning....imagine two rows of huge tanks, now why would 1 end tank burn on either row at either end plus a couple in the middle without affecting many containers just as flamable in between? how does it simply spread between this gap without any effect?