MIL-HDBK-1130
(3) Underground Concrete Tanks. Underground concrete tanks
should be drained, made gas-free, and cleaned as indicated
in paras. 2.3.l.2.a and 2.3.l.2.b. A minimum of 12 inches
of unleaded gasoline should be kept in rubber-lined tanks.
Safeguards against freezing should be taken.
(4) Fueling Pits. Inspect, tag, and cover fueling pits.
Provision should be made for pumping pits dry.
(5) Hoses. Hoses should be removed, tagged and dated, and
stored in dry storage.
Pipelines. Pipelines should be drained and capped or closed
c)
off with blank flanges. Unpainted and unwrapped lines exposed
to the weather should be coated externally with corrosion-
preventive compound. Preservation of pipelines for gasoline
and oil should be effected by displacing the oil or gasoline
with treated water as the cleaning agent, and then by
displacing the water with dry air diluted with an inert gas to
prevent explosion.
(1) Gasoline Piping. Before work involving heat is authorized
on gasoline pipelines and before they are removed for any
purpose, the lines should be freed of gas by using steam
and by flushing with water. All pipes should be clean and
free of gasoline odors.
(2)
Fuel and Diesel Oil Piping. Excessive amounts of sediment
and sludge should be removed from fuel and diesel oil
piping by the use of scrapers or by the repeated
circulation of a suitable sludge-emulsifying agent. If
the use of the circulated sludge remover involves the
temporary use of storage tanks lined with synthetic
materials, an investigation should be made prior to the
introduction of sludge remover to ensure that it will have
no damaging effects on tank linings. All cleaning
compounds should be thoroughly drained from the lines, and
internal pipe surfaces should be protected from corrosion
by flushing with fuel oil of the heaviest grade
commensurate with the pumping and heating facilities
available. Diesel oil lines should be tagged to indicate
that they have been flushed with fuel oil.
Tank and Pipeline Appurtenances. Strainers should be removed,
2.3.1.3
thoroughly cleaned, coated inside and outside with light oil, and reinstalled.
Gaskets should be tight to keep out dirt and water.
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