Underground Storage Tank (UST)
Definition - What does Underground Storage Tank (UST) mean?
An underground storage tank is a container used to house liquid substances for preservation, treatment and use at a future date. Underground storage tanks typically store petroleum and hazardous chemical substances.
Corrosionpedia explains Underground Storage Tank (UST)
There are four main types of underground storage tanks:
- Steel or aluminum
- Composite over wrapped with filament windings
- Metal matrix composite
- Composite tanks with polymer liner
Different tank types suit different applications and environmental regulatory requirements. Most underground storage tanks have at least 10% of their fluid content located below the soil surface.
Underground storage tanks are prone to pitting and crevice corrosion when placed on concrete slabs for support.