TM 5-852-5/AFR 88-19, Volume 5
where aggregate is available and the foundation
replacement is very high in remote locations so that
conditions permit slab construction. Concrete tanks
the type of coating initially selected should be of
will be covered with earth and insulated if necessary
high quality and properly applied. Cathodic protec-
to reduce heat losses as shown in figure 5-3.
tion is also required.
b. Insulation. Successful tank insulation has been
Seismic conditions must be evaluated prior to selec-
tion of a rigid concrete tank. Welded steel tanks are
provided by earth cover, wood, glass fiber, cellular
more cost effective for high-risk seismic areas.
glass, polyurethane and polystyrene block materials.
a. Corrosion protection. Steel water tanks must
Tanks can also be enclosed with a protective shell.
be painted in accordance with applicable standards.
Such an exterior shell is either constructed against
Manufacturers'
recommendations
regarding
the tank or a walkway provided between the tank
acceptable temperature limits for the application of
and the exterior wall as shown in figure 5-4. The air
these paints must be strictly followed to avoid pre-
gap and the wind protection will reduce heat losses,
mature failure. The cost of sandblasting and liner
5-2
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