PRE-ENGINEERED STORAGE TANKS
During World War II, steel tanks made possible
many operations. During large operations, especially
in forward areas, the need for rapid transport and
appropriate storage facilities were of major
importance. Steel tanks were used to store fuel, diesel
oil, gasoline, and water to meet the demand for storage
facilities. Ships and planes were supplied from secret
tank farms at overseas bases, making possible many
of the large invasions of the war in the Pacific.
This chapter will brief you on the procedures to
follow in erecting bolted steel tanks including
preparation of the foundation for a tank-
Many types of tanks are available. Besides tanks
that are constructed of standard mild steel sheets, tanks
of galvanized steel sheets and of wrought iron may
also be obtained. Tanks may be bolted, riveted, or
welded. Bolted and riveted tanks have capacities of up
to 10,000 barrels. Welded tanks may hold as many as
Steelworkers are normally concerned with
PREFABRICATED BOLTED TANKS. These tanks
are composed of steel sheets of a size that is easily
transported. Individual pieces are quite light. They can
be assembled quickly in the field by crews of
relatively untrained men so long as the man in charge
understands the details of their construction. Once the
tanks are assembled, they will last for 5 or 6 years or
longer. A shipment includes all of the bolts, the nuts,
the fittings, and the gasket material required for
assembly. Drawings and assembly instructions also
Ten-thousand-barrel tanks are used to store fuel
and diesel oil at overseas bases. One-thousand-barrel
tanks are used for gasoline storage. Low 5,000-barrel
tanks are seldom used for fuel storage where large
operations are under way, but they may be used for
storage of water. Since a barrel is equal to 42 gallons,
you can see that a 10,000-barrel tank is capable of
holding 420,000 gallons.
If desired, bolted steel tanks can be dismantled and
re-erected at another location. You can obtain
re-erection kits that contain new gasket material and
extra nuts and bolts. In disassembling a tank, however,
workers should make an effort to save all of the items
of hardware that can be used again. When taking down
a tank, avoid damage to any of the members because
the number of re-erections of a tank depend largely
upon the care taken during dismantling.
Exercise care when handling plates to
avoid bending, dropping, or otherwise
damaging the steel. Bent plates will cause
problems when the tank is erected, and when
used, the result is usually a leaking tank.
Considerable care should be taken in constructing
the GRADE or finished foundation on which the tank
is to be erected. Concrete foundations are ordinarily
not necessary if the ground is reasonably hard. When
the grade is properly prepared and perfectly level, the
tank can be joined on an even surface, and, therefore,
it is easier to fit up and erect the tank Also, with proper
support, the completed tank will be less likely to leak.
The earth grade should be constructed
approximately 1 foot greater in diameter than the
diameter of the tank which is to occupy it. The earth
must be well-tamped to a firm and smooth surface.
Never fill the area for a tank foundation because
erosion will, in time, result in a faulty foundation.
The tank foundation should be dry, level, and
well-drained. A layer of clean gravel or sand on the
grade is ideal for this purpose. Tar paper may be spread
under the tank as a corrosion-resistant carpet.
When a layer of gravel or sand is used on a grade
of firm earth, follow these steps:
1. Drive a peg in the exact center.