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A storage tank is a container, usually for holding
liquids, sometimes for gases (gas tank). The term
can be used for both reservoirs (artificial lakes
and ponds), and for manufactured containers. The
usage of the word tank for reservoirs is common or
universal in Indian English, and moderately common
in British English. In other countries, the term
tends to refer only to artificial containers such as
ponds or small lakes.
Storage tanks may often operate under no pressure
(or very little), distinguishing them from pressure
vessels. Storage tanks are often vertical
cylindrical in shape, perpendicular to the ground
with flat bottoms and fixed domed roofs, hinged or
floating roofs. There are many Environmental
considerations and regulations applicable to the
design and operation of storage tanks, often
depending on nature the fluid contained within.
Above ground storage tanks (AST) differ from
underground (UST) varieties in the kinds of
regulations that are applied.
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