Underground Construction - June 2020 - 37
EDITION 59 | JUNE 2020 | NASSCO.ORG
Adding to the confusion, the guidelines were introduced as a starting point for vetting a standard
of care with expectation of continuous improvement as PACP matured; however, its use as a cited
source without vetting local conditions has created a credibility concern. In addition, near-term
renewal strategies were based on querying Grade 4 and 5 observations without broader context.
These unintended consequences prompted a revision from NASSCO.
With the revised grade definitions, NASSCO has been explicit in stating that PACP codes and
grades only consider internal pipe observations, and that other factors such as pipe material, depth,
soils, and surface conditions also contribute to assessing pipe longevity, as those factors are not
included in PACP grade definitions. Likewise, PACP alone as a LoF indicator is inadequate for
determining the best renewal option for a pipe asset, as pipe characteristics, resiliency to extreme
weather and other CoF criteria often have significant impact on these renewal decisions. Therefore,
the PACP Condition Grading System should be used only as a tool for screening pipe segment
inspections for severity of defects and one of many considerations for capital and maintenance
improvement program decisions. The current guidelines are summarized in the following table:
Current PACP Observation Descriptions
GRADE DESCRIPTION
5
Most Significant Defect Grade
4
Significant Defect Grade
3
Moderate Defect Grade
2
Minor to Moderate Defect Grade
1
Minor Defect Grade
Remaining Useful Life Not Defined for Any
PACP Grade
Ultimately the goal for PACP is to be an integral part of determining RUL. Without anecdotal and
research information that relates defect severity grades to RUL or mean time before failure, the
relationship will be heavily reliant on CoF with PACP as a LoF benchmark of condition over time.
Once we have better documentation to develop decay curves for gravity pipe assets (wastewater
and non-wastewater applications), the application of deterioration factors against a pre-determined
new pipe expected life expectancy can be the new standard of care for RUL. Until then, look for the
next NASSCO Tech Tip from the TAC on this subject.
TECH TIPS IS A BI-MONthly article on
trends, best practices and industry
advice from NASSCO's Trenchless
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Underground Construction - June 2020
Table of Contents for the Digital Edition of Underground Construction - June 2020
Contents
Underground Construction - June 2020 - FC
Underground Construction - June 2020 - IFC
Underground Construction - June 2020 - Contents
Underground Construction - June 2020 - 4
Underground Construction - June 2020 - 5
Underground Construction - June 2020 - 6
Underground Construction - June 2020 - 7
Underground Construction - June 2020 - 8
Underground Construction - June 2020 - 9
Underground Construction - June 2020 - 10
Underground Construction - June 2020 - 11
Underground Construction - June 2020 - 12
Underground Construction - June 2020 - 13
Underground Construction - June 2020 - 14
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Underground Construction - June 2020 - IBC
Underground Construction - June 2020 - BC
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