Vertical steel tanks are vertical vessels for accumulation, storage, preparation, and metering of crude oil, petroleum products, and other liquids.
Depending on their design features, vertical cylindrical tanks are divided into the following types:
1. fixed-roof tanks without pontoons (VST);
2. fixed-roof tanks with pontoons (VSTP);
3. floating roof tanks (VSTFR).
The main support structures of the tank include: a shell together with nozzles and hatches, a bottom
annular plate, a frameless roof, a framework, and a support ring of the framed roof, a shell anchorage, and stiffening rings.
The tank enclosure structures include: a central part of the bottom, a fixed roof deck, a floating roof, and a pontoon.