Steady state HVAC Inductive Interference
Induction creates a current in conductors
near magnetic fields. This is the same as the
induction welding process used in making
much of the tube and pipe used in industry.
lation of a pipeline.
AC Electrical Corrosion. AC electrical
corrosion is caused by induction, usually when pipelines run parallel to high-voltage electrical lines (see Figure 3). The
pipe intercepts the AC current, which
then travels along the pipe. Eventually
the current returns to its source through
the soil, completing the circuit. Often the
current leaves the pipe and enters the soil
where the pipe changes direction; this is
where the corrosion occurs.
Local Cell (Pitting) Corrosion. Local
cell or pitting corrosion can occur on
any metal. It is the main form of corrosion attack on aluminum and some types
of stainless steels. These metals normally
are protected by a hard, thin film that
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