Insituform has used a 60 inch (1,524 mm) CIPP liner to rehabilitate a pipeline vital to a European city’s wastewater transmission.
Emmen is a city in the Netherlands in the Province of Drenthe, with a population of just over 100,000 people. In 2018, the municipality was faced with the need to renovate more than 700 m of large diameter concrete sewer pipe.
The transmission line had deteriorated due to age and required rehabilitation as the city relies on the infrastructure to transport wastewater to a nearby sewage treatment facility. As a result, the city contracted Aegion’s Insituform subsidiary in the Netherlands to rehabilitate the pipeline using its flagship cured-in-place pipe (CIPP) product.
Insituform® CIPP has been used for more than 45 years to protect from corrosion, restore structural integrity, reduce infiltration, eliminate leaking joints, improve water quality and increase flow capacity on pipelines all around the world. The company offers a variety of solutions for renewing wastewater and stormwater pipelines, as well as pressurised force mains and water distribution and transmission mains.
Insituform can quickly install trenchless CIPP solutions in areas not accessible to open cut methods. The company’s products have been used to renew pipelines under highways and freeways, bridges, airports and security-sensitive environments without disruption.
Project specific manufacturing
For the Emmen rehabilitation, the felt Insituform® CIPP liner was manufactured at the company’s facility in the UK and shipped to the Netherlands by sea freight.
The liner was then wetted at Insituform’s facility in Zoetermeer using a vacuum impregnation process.
All of Insituform’s CIPP tubes are designed to meet individual project specifications. The company’s manufacturing capabilities are certified to the ISO 9001:2015 standard by SAI Global, with the production of each tube tracked from start to finish.
The large diameter felt liner measured 60 inches (1,500 mm) in diameter and was separated into three different lengths: 325 m, 309 m and 91 m. After resin impregnation, each tube was extremely heavy, weighing 72,000, 70,000 and 22,000 kg respectively, or almost 165 t in total. After wet out the liners were transported more than 200 km in three separate trucks to the final installation site in Emmen.
The jobsite was located along Nieuw Amsterdamsestraatweg, a provincial road in the city that sees a large amount of traffic each day and solves multiple bottlenecks in the region, meaning minimal disruption was essential.
Keeping traffic moving
Special consideration had to be made to accommodate the jobsite locations. Traffic disturbance was minimal, as roadway access was kept open during installation; however, a large number of metal road plates were necessary for the placement of cranes and other heavy equipment helping to ensure the road was kept open and not damaged.
Special attention was also given to protect nearby residential properties. Arrangements were made so the installation would not conflict with planting season on adjacent farmland and to guarantee the area was reinstated to the same condition it was before the rehabilitation.
A bypass had to be set up for three weeks to maintain wastewater flow since the line was critical to the transport of raw sewage to the city’s treatment facility. Prior to installation, the pipeline was drained using a pump.
The bypass, which pumped nearly 700 m3/h, was then installed by a subcontractor and set up for three weeks to accommodate the CIPP installation.
The project was completed in three separate installation segments on 28 February, 6 March and 13 March 2018. Given the size and weight of the liners, giant cranes were used to hoist the liners into place over three installation points. Several obstacles also had to be manually removed in order to give the liner a clear path for insertion, before they were installed using the standard water inversion and water cure process. The project was completed and the new pipe within a pipe reinstated on Friday 22 March to the owner’s satisfaction.
This article was featured in the Fall 2019 edition of Trenchless International.
For more information visit the Insituform website.
If you have a project you would like featured in Trenchless International contact Managing Editor Chloe Jenkins at email@example.com