Well, when in doubt, lets go to the Daily Mail and see what they can add. http://www.dailymail.co.uk/news/article-2310825/West-Texas-fertilizer-plant-explosion-leaves-dead-100-injured.html Here's a picture of the owner: Owner: Donald Adair has owned the West Fertilizer Co. for around seven years
So he could answer a lot of questions about how they were actually setup.
Daily Mail Fustration... - They have 'three' tanks listed as ammonia tanks - Site only had 2 ammonia tanks. - Each tank holds only 12,000 US Gallons. - The size of a tank truck. - Those are NOT pressure containing tanks. - Probably grain storage tanks.
Now here is what a 12,000 Gallon Ammonia trailer looks like http://www.transcaer.com/docs/AATour/Transcaer_Ammonia_Training_2011Transports_IG_rev10.pdf - long - skinny - white (to reflect heat from the sun) - not those massive grey clunky things.