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.

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Corrosionpedia explains Underground Storage Tank (UST)

There are four main types of underground storage tanks:

  1. Steel or aluminum
  2. Composite over wrapped with filament windings
  3. Metal matrix composite
  4. 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.

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