posted on Dec, 30 2007 @ 01:36 AM
It is a chilled fermentation tank or a jacketed tank, I think, if the yellow is a foam coating it is for sure it might still be one if its just
Tank like that are used in the making of wine, cheese, milk products, all sorts of products that are in need of chilling or heating for that
What look like rivets are actually spot welds between the inner and outer walls.
The main tank walls are on the inside they are heavier but still pretty thin 1o-14ga sheet. A layer of 18 ga sheet is laid on top of the heavier
sheet and the two are spot welded together. The density of welds is determined by how much volume is required in the jacket.
After the two sheets are spot welded together, the outside edge of the thinner sheet is welded to the base sheet making a gas tight seal. The panels
are then rolled into cylinders and welded together. Tops and bottoms are put on, there is most likely a manhole entrance somewhere on it, and a vent
valve at the top.
When the tank is done a high pressure nitrogen tank is attached to the jacket and it is pressureized to 1400 psi. This "pops" the thinner metal
outward into a jacket.
The fitting on the lower left is a standard food industry quick release tubing clamp.
Even very large tanks are very lightly built, at the company I worked at where we built tanks like that, they would test newly completed tanks, by
filling them with water and letting them sit for several days and checking for leaks.
One of the knucle heads that worked there, forgot to open the vents at the top of 2 large tanks( 75' tall by 30' dia.) when he drained them and
they crumpled liked beer cans from the vacuum formed by the outrushing water.
Its made from stainless steel, as is evident by the flange at the bottom, and you can see where the piping connects to the jacket on the right.
It fell off of a container ship and lost its shipping frame, but it floated cause its water tight.