Underground Construction - July 2018 - 34

Nuclear CIPP
Recent Projects

Two recent lining projects completed by Elite Pipeline Services at
nuclear facilities document how a common trenchless method is
benefiting the nuclear industry.
Emergency repair to a ruptured 8-inch diameter steel fire suppression pipe was Elite's first pressure-rated UC CIPP application.
Length of the lining was 40 feet, with a design pressure of 150 psi
and operating pressure of 100 psi. The pipe was only 5- to 6-feet
deep, but digging wasn't an option due to underground interferences and location.
"Elite Pipeline's immediate response included a 550-psi rated
4.3-mm UV repair that was expedited direct from Germany," said
Terry Bell, Elite general manager. "Before lining could be made,
the pipe required CCTV investigation and extensive cleaning. The
line had very heavy tuberculation that was removed after several
passes of jetting. The pipe was successfully lined and treated with
internal joint seal terminations. The plant was able to quickly reenergize the system shortly after the repair."
A second project involved upgrading 250 linear feet of 36-inch
corrugated metal (CMP) storm pipe. This project was in the protected area (PA), which elevates the level of security and scrutiny,
and was being done to address engineering concerns regarding a

future, above-ground diesel generator site. With the additional
above-ground loading from a proposed diesel generator and building, engineers needed assurance the pipe below could accommodate needs without future failure. In this case, CIPP provided the
comfort level.
"After extensive engineering evaluation and review, a
36-inch by12-mm UV CIPP liner was authorized," Bell said.
"Because installation was inside the PA, plant security traveled to the manufacturer's facility to verify and secure liner
crating for transport. All equipment arriving at the facility
went through a rigorous inspection process and was staged
with plant assistance."
Access for installation was a 48-inch manhole with 24-inch
opening (downstream) and 24-inch CMP vertical (upstream).
Confined space entry was complicated by the eccentric configuration and multiple inlets that required water mitigation. Ground
water inflow was a constant challenge.
"Inlet piping," Bell continued, "required isolation and careful monitoring throughout the work." The liner was successfully
cured using UV light trains and was end-sealed.

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Underground Construction - July 2018

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