MIL-HDBK-1005/16
Section 12:
CORROSION CONTROL
12.
12.1
Corrosive Environment. The corrosive environment found
in most wastewater treatment plants can range from mild to
aggressive, depending upon the source of the wastewater
(industrial loading), the geographical location of the plant
(proximity to seacoast locations), the characteristics of the
soils in the area, and the chemicals used on site for treatment.
While many of the structures associated with WWTPs are made of
concrete, there are many applications requiring metal alloys and
nonmetallic materials. In most cases, corrosion issues should be
addressed in the design stage and appropriate materials selection
or corrosion mitigation procedures specified.
Being aware of potential corrosion problems during the
design phase will greatly minimize problems that can develop
during construction or after the facility is commissioned and
operational. The primary design guidance contains salient
discussion of the treatment system components typically subject
to corrosion, and the specific compounds of concern. These are
discussed chapter by chapter in WEF MOP 8. WEF MOP 8 Chapter 8
is devoted entirely to construction materials selection, and
contains guidance on evaluating plant exposure conditions,
potential for corrosion/deterioration, and design consideration
in the selection of materials and construction techniques. WEF
MOP FD-5 Chapter 4 also contains guidance for corrosion
protection in sewers. This section provides information on a
number of corrosion issues that should be handled during design.
Additional information is available in Air Force Instruction
(AFI) 32-1054, Corrosion Control and MO-307, Corrosion Control,
which should be used as a reference guide in addition to the
information presented in this section.
12.1.1
Underground Exposures. Underground exposures include
piping (steel, ductile iron, reinforced concrete, prestressed
concrete) and various concrete structures (foundations, manholes,
pump stations, wet-wells, clarifiers). The characteristics of
the soils in which materials will be exposed have a direct
bearing on their corrosion performance and will directly affect
the corrosion mitigation procedures that will be required.
All new designs require geotechnical investigations of
the characteristics of the soil. In addition to the normal data
developed from these investigations to determine load-bearing
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