Pipeline Rehabilitation and Relining

Pipeline Rehabilitation and Relining
Noninvasive liner quickly installed in municipal drainage pipe

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Noninvasive liner quickly installed in municipal drainage pipe

Problem
The Louisville/Jefferson County (Ky.) Metropolitan Sewer District needed a noninvasive option to rehabilitate an existing 150-foot-8-inch steel sewer pipe that was part of a large sewer treatment plant renovation project. The district didn’t want the newly renovated treatment plant and other underground utilities disturbed. The contractor, Dugan & Meyers, was also on a tight timeframe to complete the project.

Solution
The district chose a certified Flow-Liner Systems installer to line the existing pipe utilizing Pre-Wet-Out (PWO) liner. The liner was shipped to the project site impregnated with resin, then steam cured to save time. The drainage pipe was lined successfully and the curing time was less than three hours.

Result
The contractor and MSD were very happy with the result and the time-saving efficiency. The company received a letter from the Project Engineer that stated, “We were very impressed and pleased with the Flow-Liner installation. The pipe lining saved us from digging up the pipe and disturbing buried utilities. We would certainly use Flow-Liner for future projects.” 800/348-0020; www.flow-liner.com.

Large-diameter lift station fusion performed in-ditch

Problem
Sunroc Corporation needed specialty help to fuse two 42-inch pipe flange adapters to tie-in 160 feet of pipe to existing HDPE pipelines at a sewer lift station in South Jordan, Utah. With very limited space and time, there were few options. The job required both large-diameter off-carriage fusions and large-diameter electrofusion.

Solution
ISCO Industries initially sold 14 miles of 42-inch HDPE pipe for the sewer lift station. When the initial contractor did not fuse the pipe to the lift station, ISCO stepped in to offer an answer. Going off-carriage with a 42-inch TD Williams fusion machine, ISCO field technician Courtney Evans and Steve Holpp, with Integrity Fusion Products LLC, performed the large-diameter fusions in-ditch. They also eliminated the need for mechanical joints by using electrofusion for the HDPE couplings.

Result
The approach saved Sunroc $20,000. The customer was very satisfied with the repair, the project timeline and the cost-savings offered by ISCO. 800/345-4726; www.isco-pipe.com.

Fast-curing polymer lining system rehabilitates corroded concrete pipe

Problem
The SD342 Wood Street, Phase II Project from the East Bay Municipal Utility District (EBMUD) in Oakland, Calif., includes rehabilitating approximately 6,200 feet of a severely corroded 105-inch-diameter concrete pipe, which has lost its structural integrity. This pipeline conveys most of the influent flow into the 168 mgd treatment plant, which serves approximately 650,000 residents along the eastern shore of San Francisco Bay. It is also used as wastewater storage for flow equalization purposes.

Solution
Due to budget, risk and schedule concerns, the work had to be performed at night, during low flows and without bypassing. Furthermore, since the pipeline runs under a residential area, the installation had to proceed without disturbing the neighbors, keep noise levels at or below 65 dB and keep hydrogen sulfide emissions undetectable. EBMUD and their consulting engineer, Brown and Caldwell, chose to continue the rehabilitation with the same fast-curing Pipeline Structural Polymer Co-Lining System from Linabond Inc. that was used successfully in 2000 for Phase I, which won the International Society for Trenchless Technology award for that year.

Result
The Phase II Project was awarded to J.R. Pipeline, who has now completed the first section, achieving liner installation rates of up to 1 linear foot per minute. The remainder of the project is to be completed this year. 805/484-7373; www.linabond.com.

Structural lining system reduces inflow and infiltration

Problem
Sarasota County, Fla., needed to rehabilitate 95 percent of their sewer laterals. Infiltration during the area’s rainy season revealed that many of these clay pipes had developed cracks, which resulted in the county increased costs to haul the excess water from wastewater facilities. The laterals have 6-inch diameters, range from 15 to 25 feet in length and are located several feet below the homeowners’ and businesses’ front yards, driveways, city sidewalks and streets throughout the county.

Solution
The customer chose Nu Flow Technologies because they wanted a nondestructive solution as opposed to a traditional repipe. The company installed its Nu Drain system. A structural liner was installed using Pull-in-Place technology, which utilizes existing access points and prevents digging or destruction to landscape or hardscape. The epoxy-saturated liner cured within hours to form a seamless pipe-within-a-pipe, which will prevent cracks, root intrusion, groundwater infiltration, blockages and other common failures.

Result
The customer was satisfied with Nu Flow’s solution. The early results of the lining project show a large reduction of inflow and infiltration in the sanitary sewer system. 800/834-9597; www.nuflowtech.com.

Centrifugal spincast lining prevents discoloration issues

Problem
The water department in Sac City, Iowa, was bombarded with complaints from residents with severely discolored water. Along with this, flows from existing fire hydrants along the 4- and 6-inch cast-iron water lines were low. The piping system was approximately 2,800 feet in length, serving 41 homes. The city tried traditional methods of flushing the lines, but this only offered a temporary reprieve. A long-term solution was required while keeping cost to a minimum.

Solution
The city contracted with Triton Lining Systems LLC to clean the inside of the pipes, removing all tuberculation, scale and buildup. An above-ground bypass system was installed to feed all properties. The pipes were dried and CCTV inspected. They were then internally lined with the company’s centrifugal spincast process. The process applies an NSF61 certified epoxy resin, at a computer-controlled rate, ensuring the lining is applied evenly around the full circumference and along the entire length of the pipe section being lined. Following the resin cure time, the lining was inspected for quality assurance, chlorinated and returned to service.

Result
The entire project was complete in six weeks. All complaints have ceased, and fire flows have been restored. The city realized a cost savings of approximately $1.58 million. 407/928-9339; www.tritonpipelining.com.



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