the liquids and temperature of the liquids. Exterior of buried tanks should
be coated with a protective coating such as fiberglass resins or coal tar
Cathodic protection is recommended to reduce or prevent corrosion
of underground metallic structures or pipe. By using sacrificial anodes or
impressing potentials on the metallic structures or pipe makes them cathodic
throughout with respect to the surrounding soil (electrolyte). See
Surroundings may be changed by any of the
Change of Environment.
Water treatment; Refer to para.7.1.1
Deaeration; Refer to Table 17
c) Inhibitors. These substances retard corrosion by increasing
the polarization rate at either an anode or cathode metal or both. They can
also build up electrical resistance films in the conduction paths between
anodes and cathodes. Refer to Table 24 for inorganic corrosion inhibitors.
Sample organic inhibitors are glucosates, amines, phenyl-hydrazines, and
d) Soil alteration. Replace corrosive soils with sand or selected
soils, or change its characteristics by adequate drainage.
Plant Water Requirements. Raw water makeup shall be sized to
satisfy all plant water requirements including plant water treatment,
backwash, ash handling equipment, flue gas scrubbers, and other usage. Other
areas to consider include:
a) Cooling water for pump stuffing boxes, water cooled air
compressors and aftercoolers, water sampling coils, and blowoff pits.
Air washer and dust dampener for ash handling.
Flue gas desulfurization system.
Domestic hot and cold water.
Hose bibbs for washdown and other usages in plant and tunnels.