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)
Determining the required number of pipe inspections.
)
Excavating the pipe at locations where external
corrosion activity is most probable.
)
Evaluating coating defects and corrosion damage.
)
Performing root cause analysis for coating defects and
corrosion damage.
)
Completing an evaluation of the ECDA process and,
if needed, reclassifying and/or reprioritising the
indications noted in the indirect inspection step.
Indications found in the pre-assessment and indirect
inspection steps are prioritised based on severity, and
the pipeline is then excavated and inspected at specific
locations. The ECDA process defines the number of
excavations that are required.
Post-assessment
The post-assessment step determines reassessment
intervals and assesses the effectiveness of the ECDA
process. Activities include:
)
Additional post-assessment pipe excavations (pipe and
coating inspections).
)
Remaining life calculations.
)
Reassessment interval determinations.
)
Assessment of ECDA effectiveness.
)
Feedback for process improvement.
Utilising the principles of ECDA
The process in its entirety is lengthy, thorough, and a
robust means to evaluate external corrosion threats. The
process is structured and, for regulated pipelines, each
activity is required for the process to be considered
complete and an approved integrity assessment method
used.
Utilising the structure and principles of the process,
while tailoring steps to meet the specific corrosion threats
of other steel assets, can be an effective way to identify
potential corrosion as well as develop a plan for attacking
it. For example, congested areas with multiple buried
steel structures may benefit from a grid survey instead
of a typical pipeline close interval survey. Grid surveys
also measure structure-to-soil potentials, but instead of
surveying in a single line over a pipeline, a grid pattern is
mapped out over multiple assets.
The survey techniques previously mentioned are
time-tested and industry-accepted methods for assessing
pipelines, and the equipment is readily available for
purchase by any user. However, experience selecting the
right methods, using the equipment, and interpreting
the results will have a significant impact on the quality
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