Underground Construction - December 2020 - 13
for nearly 10 years. Congress included
a provision in the 2011 Pipeline Safety
Act that required PHMSA to evaluate
whether applying IM principles to areas
outside of high consequence areas (HCA)
could possibly mitigate or eliminate the
need for class location requirements.
In a 2016 published report, PHMSA said
the application of IM requirements to
gas transmission pipelines outside
of HCAs would not warrant the total
elimination of class locations.
However, PHMSA stated that it
intended to consider whether adjustments
were needed in the way that operators
were required to implement certain
requirements when class locations did
change. On July 31, 2018, PHMSA
published an advance notice of proposed
rulemaking (ANPRM) that made good on
that promise and asked for suggestions on
changes in class location requirements.
This proposed rule is the next step.
It addresses the limited situation where
an operator is faced with a change from
a class 1 location to a class 3 location.
In such cases, under the class locations
system, the existing options of pressure
testing or reducing operating pressure
can be technically or operationally
prohibitive for meeting contractual
gas flow volume obligations.
If an operator cannot pressure test
or reduce operating pressure, the only
options remaining per the existing
regulations are to replace the pipe with
higher-strength pipe by installing pipe
with either greater wall thickness or higher
steel grade, or apply for a special permit.
Pipelines that choose to take advantage
of the new alternative for " allowable
segments " would follow IM requirements
in subpart O (the 2003 final rule) and
additional requirements for applicable
segments, which include required in-line
inspections (ILI), external pipeline coating,
cathodic protection, pipeline repair criteria
to maintain MAOP with a Class 1 location
39-percent safety factor; usage of remotecontrolled or automatic shutoff valves; and
other additional preventive and mitigative
(P&M) measures. PHMSA expects these
measures to provide for an equivalent level
of safety for the life of the pipeline when
compared to pipe replacement.
However, a pipeline segment can only
be eligible for the IM alternative if it has
a documented, successful, eight-hour
pressure test to a minimum of 1.25 times
MAOP. Even then, segments would not be
eligible if they had such things as bare pipe,
wrinkle bends, missing material properties
records or some other listed shortcomings.
The pipeline industry official said that
some of these exclusions would be front
and center in the industry's efforts to
modify the proposed rule. *
UCONonline.com | DECEMBER 2020
13
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Underground Construction - December 2020
Table of Contents for the Digital Edition of Underground Construction - December 2020
Contents
Underground Construction - December 2020 - Cover1
Underground Construction - December 2020 - Cover2
Underground Construction - December 2020 - Contents
Underground Construction - December 2020 - 4
Underground Construction - December 2020 - 5
Underground Construction - December 2020 - 6
Underground Construction - December 2020 - 7
Underground Construction - December 2020 - 8
Underground Construction - December 2020 - 9
Underground Construction - December 2020 - 10
Underground Construction - December 2020 - 11
Underground Construction - December 2020 - 12
Underground Construction - December 2020 - 13
Underground Construction - December 2020 - 14
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Underground Construction - December 2020 - 16
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Underground Construction - December 2020 - 20
Underground Construction - December 2020 - 21
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Underground Construction - December 2020 - Cover3
Underground Construction - December 2020 - Cover4
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