CIPP Lining Methods And Projects

CIPP Lining Methods And Projects
Challenging lines sealed without digging or traffic disruption

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Point repair system restores three damaged areas in sewer main

Problem: In June 2014, Mid-Mo Environmental of Jefferson City, Mo., cleaned and televised sewer mains in the nearby town of New Bloomfield in Callaway County. Many of these lines are under the streets and buried in excess of 10 feet deep. While televising one such line, they assessed a lateral crack, an abandoned tap and a bad joint all within a 6-foot-2-inch span, causing severe inflow and infiltration issues. The pipe was an 8-inch reinforced truss pipe installed in the 1970s.

Solution: Mid-Mo decided to use a trenchless point repair system from Infrastructure Repair Systems to restore the three damaged areas with a single 7-foot spot repair. Since the repair was within 24 feet of the near end of the manhole, owner Shawn York devised a 3/4-inch PVC pushrod to push the Logiball carrier and liner into place.

Result: The pushrod saved the time of jetting and stringing the entire 375-foot line and pushed the carrier with the resin-soaked fiberglass and felt liner in position to cover all three damaged areas. This single repair saved the town a significant amount of money by covering three areas with one long point repair, along with no digging and repaving the street. The installation was completed in less than three hours without any disruption of service to customers or the environment. 877/327-4216; www.irsi.net.

Cured-in-place pipe relining rehabilitates line beneath Amtrak maintenance facility

Problem: Amtrak officials at one of the company’s primary maintenance facilities in Beech Grove, Ind., were concerned about the condition of the sewer lines. They wanted to make sure there were no leaks or discharge that could negatively impact the surrounding community. Most of the sewer lines ran beneath several of the buildings and tracks on the property.

Solution: IWPC, a division of Inland Pipe Rehabilitation (IPR), televised the sewer system to assess its condition. “We discovered a wide variety of pipe material and sizes that were used. They included ductile iron, vitrified clay and PVC in diameters ranging from 6 to 20 inches,” says Tony Schieweck, general supervisor for IWPC. They recommended their Cured-In-Place Pipe relining system. The installation would require no major digging, and Amtrak could keep the facility open throughout the repair process. 

Result: In all, over 7,500 feet of sewer pipe was relined to restore the system to its original performance requirements. IWPC also spray-lined 34 manholes that were showing signs of deterioration. Given a 129-day window to complete the project, IWPC completed the work in half the time. “We’re extremely pleased with the results,” says Ellen Jurczak, Amtrak’s senior environmental coordinator. “We can take comfort in knowing that our sewer system is functioning properly; so can our neighbors in the City of Beech Grove.” 855/832-6477; www.teamipr.com.

Packing unit used to stop active infiltration

Problem: After 18 months and over 45 gpm of active infiltration flowing into a 30-inch sewer siphon line, a municipality in southern Texas needed an answer. This siphon line not only ran underneath a major river but also involved several property owners. Digging would cost in excess of $750,000 and disrupt the environment and a nearby wastewater treatment facility. Traditional lining methods were not an option due to the infiltration and the siphon being more than 200 feet underground. The siphon had two 45-degree and one 22-degree bend, so using the normal no-dig packer and equipment was next to impossible.

Solution: The municipality looked to Source 1 Environmental (S1E) for a no-dig solution. Jeff Urbanski, director of research and development at S1E, designed the Pillow Packer. A water truck created a water slide to aid in the pull process, while a technician carefully negotiated the three bends. The longest pull was in excess of 320 feet.

Result: The pillow was successfully utilized on three breaks and stopped all active infiltration. It saved the municipality time and resources in excess of $1 million. 810/412-4740; www.s1eonline.com.

Cutting system solves problem caused by relining overshoot

Problem: The owners of a Philadelphia suburban townhouse opted for trenchless technology to solve root intrusion in their sewer lateral. With the absence of any outside clean-outs, a pit was dug at the mainline connection, and the 4-inch lateral was relined 65 feet back to the house. The lateral entered the house under the slab of a finished basement where it transitioned to 3-inch. Unfortunately, the liner overshot and covered the laundry drain connection. Epoxy buildup on the back of the connection made opening from the laundry side unsuccessful on two separate attempts, even with the use of a drill rod.

Solution: On the third attempt, two weeks after the relining mishap, TRY TEK’s Trydent 80 Cutting System was employed. An upstream section of 3-inch pipe was accessed from inside the house. The unit was to navigate the 3-inch 90-degree elbow, enter the 4-inch section, and open the connection about 15 feet away. However, when the pipe was accessed, the interior diameter was only 2 inches due to buildup. Fortunately, the unit has a 100-foot reach and could be deployed from the pit, about 70 feet away. An inspection camera was inserted from the house to tow the cutting system up the sloped lateral and into position. The connection was then reinstated.

Result: The homeowners were finally able to use their laundry room, and the contractor was relieved that they did not have to dig up a finished basement floor. 717/428-1477; www.trytek.com.



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