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GRADIENT CONTROL MATS |
Gradient
Control Mat (GCM) Overview
Personnel working near pipelines can be subject
to electrical hazards such as touch and step voltages caused
by lightning, AC fault current/voltage, and steady-state AC
induction. "Ground mats" have typically been used at above ground
pipeline structures where these hazards exist, but past designs
do not provide adequate protection against lightning conditions.
The DEI Gradient Control Mat (GCM) addresses lightning and AC
fault current conditions. Step and touch potentials are now
limited with the DEI grid-type mat, in a much lower cost design.
DEI also recommends DC decoupling of the gradient control mats
from the structure to improve CP on the pipeline.
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Features
and Characteristics
Low cost design
Galvanized steel grid, using 3" x 3" squares
The low inductance design limits step and touch potentials
due to lightning
DC Decoupling the mat from the structure offers long life
and improved CP on the pipeline
Data is available, upon request, on design life and supplemental
anodes.
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