Underground Construction - January 2019 - 29

ing, rotating polyurethane belt
designed to remove sticky consolidated clays, organics and larger
gravel-size particles. The primer
load relieves material ahead of
the two primary shakers and is
especially beneficial when tunneling/drilling in heavy clay solids
that typically do not convey well
on vibrating shakers."
Secondary separation is performed by two Derrick High "G"
Linear Motion Shakers outfitted
with Derrick's innovative Pyramid Screen technology to remove
as many solids as possible prior
to hydrocyclone processing. This
maximizes the hydrocyclones
performance and allows them
to work on the finer sands and
silts limiting particle attrition,
wear on centrifugal pumps, and

other downstream processing
equipment.
One set each desanding and
desilting hydrocyclones are
mounted above two more Derrick
High "G" shakers outfitted with
finer Pyramid screen technology
to complete the main cleaning
system. Additional fine solids removal is performed by centrifuge
technology as the final step in the
cleaning process.
With any installation that
pushes the limits of what has
previously been accomplished,
there are numerous challenges
throughout design, project planning and construction.
"The project location was within the eye of Hurricane Harvey,
which delayed the mobilization,"
Carlin said. "Harvey made landfall the week scheduled to start

mobilizing loads, and they took
longer to arrive due to all of the
destruction. In addition, there
were shortages in critical project
parameters such as trucking for
disposal, as well as housing which
took additional coordination."
"The team planned extensively for confined space entry
during the initial connection of
the MTBM and at the end during
the MTBM's removal from the
pipeline. We also anticipated
unplanned scenarios, which were
likely for common repairs should
mechanical, electrical or HWL
systems fail within the pipeline
or the MTBM."
In total, Laney performed nine
confined entries with the furthest
entry at a length of nearly 4,000
feet into the pipeline. All entries
were made safely with no nega-

tive results or safety breakdowns.
"In the end, the project was
completed on schedule and within budget and, most importantly,
safely with zero time lost to
injury," said Carlin.
In addition, the Gulf of Mexico Direct Pipe Shore Approach
marked the 11th successful Direct Pipe installation for Laney,
giving the company the record
for total pipeline installed in
North America − at more than
23,000 feet.
FOR MORE INFORMATION:
Laney Directional Drilling,
(281) 540-6615, laneydrilling.com
Derrick Equipment Company,
866-DERRICK,
derrickinternational.com
Herrenknecht, (253) 241-3709,
herrenknecht.com

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UConOnline.com | JANUARY 2019

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Underground Construction - January 2019

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