12 Va. Admin. Code § 5-590-950 - Corrosion control or stabilization
A. Water that is unstable due either to
natural causes or to the treatment applied to the water shall be
stabilized.
B. Deposition of
calcium carbonate film. The desired calcium carbonate film may be obtained by
using either soda ash or caustic soda when the alkalinity of the water exceeds
about 35 mg/L. Soft waters should be treated with lime to provide the required
calcium. Soft waters that also have a low carbon dioxide content may need a
mixture of lime and soda ash to provide both calcium and carbonate for the
calcium carbonate film.
C.
Phosphates or other corrosion inhibitors may be used for corrosion control when
applied in accordance with manufacturer recommendations and when they meet the
requirements of
12VAC5-590-515. Stock phosphate
solution shall be disinfected in accordance with manufacturer recommendations
unless the phosphate solution is fed directly from the covered shipping
container.
D. Cathodic protection
shall be acceptable for preventing or reducing corrosion of the inner surfaces
of water storage tanks and standpipes and the outer surface of metal
pipe.
E. Laboratory equipment shall
be provided for determining the effectiveness of stabilization treatment and
the concentration of chemicals in the treated water.
Notes
Statutory Authority: §§ 32.1-12 and 32.1-170 of the Code of Virginia.
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