Underground Infrastructure - July 2023 - 34

PACPTM Condition Grading System
By Tanya Stephens, A.Sc.T., NASSCO-Certified Trainer
Each of NASSCO'S Pipeline Assessment
Certification Program (PACP) inspection reports
offer eight or nine different condition grades:
* Structural Quick Rating
* Operational and Maintenance (O&M) Quick Rating
* Overall Quick Rating
* Structural Pipe Rating
* O&M Pipe Rating
* Overall Pipe Rating
* Structural Pipe Rating Index
* O&M Pipe Rating Index
* Overall Pipe Rating Index
How each of these condition ratings are calculated
is outlined within the PACP Manual Appendix C,
but what do they mean and how can they be
interpreted?
It is important to acknowledge that the PACP
Condition Ratings are a product of Condition
Grades (1 through 5) and the number of
occurrences that each Condition Grade is
observed. Consider two separate pipes: one with
one hole, and the other with five holes. Both pipes
have the same " hole structural grade 4 severity "
however, one pipe is in much worse condition than
the other because the number of occurrences of
the holes is greater. An overall condition must
consider the severity of the defects observed as
well as the extent of defects observed.
The condition grading system only refers to the
condition of the pipe length surveyed. It does not
reflect asset management principles. Some might
consider that if a hole occurs on a short section of
pipe versus a long section of pipe, the short
section of pipe should be considered in worse
condition. This is not the case. A hole is a hole,
the same defect, the same severity, regardless of
pipe size, length, material, etc. However, a hole in
a sanitary sewer versus a hole in a storm sewer
might be considered a higher risk once applying
asset management principles to condition data.
Applying asset management principles to PACP
inspection data allows asset inventory reporting,
condition reporting, tracking of deterioration over
time, map results, setting priorities and
consequence of failure, assigning rehabilitation
and maintenance needs, and risk assessment.
PACP condition grades are assigned as either
structural or O&M, and condition ratings are
reported separately as structural, O&M, and
overall. This is an important distinction as it allows
owners to quickly determine the department that
should be attending to the pipe. Structural defects
are often associated with performance models, life
cycle and financial reporting including capital
planning. High structural grades drive more
urgent/higher priority for replacement or
rehabilitation.

Underground Infrastructure - July 2023

Table of Contents for the Digital Edition of Underground Infrastructure - July 2023

Underground Infrastructure - July 2023 - 1
Underground Infrastructure - July 2023 - 2
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