MIL-HDBK-1005/16
12.2.6.2 Ferric Chloride. This material is acidic and is very
corrosive to many materials of construction. Beyond the chemical
storage and containment area, any surface exposed to ferric
chloride will be deteriorated. Concrete floors and the
reinforcing steel in the concrete will be rapidly attacked if
exposed to this chemical.
12.2.6.3 Hydrogen Peroxide. Hydrogen peroxide is a very strong
oxidizer and can be rather unstable under certain conditions.
While not considered explosive, if rapid decomposition takes
place, it can be rather violent, leading to rapid pressurization
of tanks and piping. If not properly vented, this pressurization
can take on the characteristics of an explosion. Before placing
a tank into peroxide service, it should be cleaned and passivated
using an oxidizing acid, such as nitric acid. Producers and
suppliers of hydrogen peroxide will perform this service.
12.2.6.4 Sodium Hydroxide and Sodium Hypochlorite. Sodium
hydroxide and sodium hypochlorite storage tanks require special
construction for FRP materials. In both services, it is
recommended that the interior surfacing veil be a synthetic
material rather than glass fiber. In addition, it is recommended
that post-curing of the tank be performed using hot air, in
accordance with the resin manufacturer's recommendations.
All FRP tanks should be fabricated in accordance with
ASTM D3299, Standard Specification for Filament-Wound Glass-
Fiber-Reinforced Thermoset Resin Chemical-Resistant Tanks, or
ASTM D4097, Standard Specification for Contact-Molded Glass-
Fiber-Reinforced Thermoset Resin Chemical-Resistant Tanks. These
are atmospheric storage tanks and should be properly vented to
avoid any over pressurization.
12.2.6.5 Concentrated Sulfuric Acid. Systems must be carefully
designed to withstand the aggressive nature of this acid.
Although bare carbon steel may be used in this service, it is
very sensitive to fluid velocities in piping systems and will
develop a sulfate sludge in storage tanks that presents a problem
to remove. For that reason, phenolic-lined steel tanks with
stainless steel piping are preferred.
Details for designing sulfuric acid may be found in
NACE Standard RP0391, Materials for the Handling and Storage of
Concentrated (90 to 100%) Sulfuric Acid at Ambient Temperatures.
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