Underground Construction - October 2020 - 20
PACP™ AND REMAINING USEFUL LIFE (RUL) PART 3:
THE TRENCHLESS
REHABILITATION DESIGN
VERSUS RUL CONUNDRUM
By NASSCO TAC Chair Christopher Garrett, P.E., Brown and Caldwell
Continuing our discussion on condition assessment and Remaining Useful Life (RUL) of gravity
pipe assets, we conclude the three-part series with an examination of rehabilitation methods and
anticipated service life.
Historically, aging infrastructure professionals accepted a typical pipeline asset service life to be
about 50 years. I accepted this as fact and did not question the basis of the estimation or its
validity. Logic was that as the asset approached that magic age, the option was to either replace or
rehabilitate. Lynn Osborn, P.E., NASSCO's former Technical Director, a current member of NASSCO's
Technical Advisory Council (TAC) and UESI President, relates a similar experience with cured-in-place
pipe (CIPP):
"The initial declaration of a design life for gravity sewer CIPP came out of marketing, not
engineering. In the mid-1980s, customers began asking how long CIPP would last; what is
its design life? There were several responses when customers were asked how long they
would like for CIPP to last, but one response seemed to take hold: a common planning cycle
for governmental units is 50 years, so 50 years would be good. Thus, an expected design
life of 50 years was accepted, and this value began to appear in conference papers, product
advertisements and trade show stands."
This sober view of the genesis of RUL for rehabilitation has been validated with standards
development, such as ASTM F1216 and F2019 for CIPP, supported by repeatable testing results
that have produced a reliable design methodology. These design standards include groundwater
influence, live load, soil surcharge and soil movement / migration / strength
as design parameters of concern, which reflect their influence on pipe
deterioration.
Christopher Garrett, P.E., Brown and Caldwell
Christopher Garratt is a Professional Engineer with an emphasis on Aging and
Buried Infrastructure projects for gravity and pressure mains by promoting
advanced condition assessment technologies; risk-based prioritization and
contingency planning; rehabilitation design and construction administration. He is
also a trainer for the NASSCO PACP/MACP/LACP program, having trained and
certified over 1,500 students since 2002.
Underground Construction - October 2020
Table of Contents for the Digital Edition of Underground Construction - October 2020
Contents
Underground Construction - October 2020 - Cover1
Underground Construction - October 2020 - Cover2
Underground Construction - October 2020 - Contents
Underground Construction - October 2020 - 4
Underground Construction - October 2020 - 5
Underground Construction - October 2020 - 6
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Underground Construction - October 2020 - Cover3
Underground Construction - October 2020 - Cover4
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