A pioneer in cured-in-place pipe (CIPP) technology, Insituform has installed over 40,000 km of CIPP worldwide. The Insituform® CIPP process is suited for wastewater pipeline repair and can be used to rehabilitate sanitary sewers, storm sewers and force mains. Insituform® CIPP, or Insitupipe®, is a jointless pipe-within-a-pipe with the capability to rehabilitate pipelines ranging in diameter from DN150 to DN2500 and to negotiate bends.
Insituform® CIPP addresses your top concerns:
- Infiltration reduction: Water entering your wastewater system through holes, breaks and joint failures can significantly tax your treatment facilities, especially during storm events. Insituform®CIPP can significantly reduce this infiltration and eliminate leakage from your system. In dry climates, tree and plant roots find the sewer system an attractive source of water and nutrients. Entering through pipe defects, roots create blockages and overflows. Insituform® CIPP contains your flow within the pipe while keeping external water and roots out. We can help you avoid the large capital cost of expanding treatment facilities and the environmental problems caused by sewer overflows.
- Structural integrity: Insituform®CIPP restores structural integrity to your damaged sewer pipes. The design models used, independent test results and over 45 years of service all confirm that Insituform® CIPP is a structural product with a 100-year design life.
- Increased flow capacity:Insituform® CIPP provides the least cross-sectional reduction of all methods used to rehabilitate pipes. Despite the minimal cross-sectional reduction, the smooth, jointless interior of our product typically improves flow capacity. There are no joints that can separate over time. The smooth interior also provides excellent abrasion resistance.
- Affordability: The Insituform®CIPP process is typically less expensive than conventional methods of sewer repair, even for everyday problems. When you consider the lost business revenues, traffic congestion and social costs associated with other methods, your savings are immeasurable.
- Installation flexibility: Insituform offers flexibility in both the method of installation and the cure process. Insituform®CIPP, also known commercially as Insitutube®, can be pulled into place or inverted with either air or water. The cure can be done with steam or hot water. All processes are consistent with nationally recognized standards and Insituform’s own ISO-certified quality control program. Since each job is unique, we can apply the most cost-effective, technically optimal solution to solve your pipeline rehabilitation problem.
CIPP Tube Manufacture
Only premium-quality raw materials are used to manufacture Insituform® CIPP. To ensure that they meet our specifications for thickness and strength, each tube is put through more than 25 separate quality checks. These tests, along with the detailed records, help ensure that all our tubes meet our stringent quality standards for trenchless CIPP rehabilitation.
To create uniform thickness around the full circumference of the Insituform® tube, a patented method for sewing together the butted ends of our felt was developed. Our experience has shown that the strongest tubes with the fewest wrinkles are made with butt-sewn seams. Overlapped seams often create uneven thickness and surface wrinkles.
The felt tubes are then coated with a permanently-bonded, continuous layer of polypropylene, which is 50 percent thicker than conventional coatings. The polypropylene coating is firmly bonded to the felt and is resistant to hydrolysis and chemical attack. We have found that our polypropylene coating lasts longer than the polyurethane coating used by other companies offering trenchless pipeline rehabilitation.
CIPP Resins Systems
Vacuum Impregnation Wet Out Process
In addition to having a high-quality felt tube, a sewer rehabilitation project requires the use of resins specifically developed and tested for tube wet out. A patented method was developed to make sure resin completely fills our felt CIPP tube during wet out. The serial vacuum impregnation process enables our resin to fully saturate tubes of any length or thickness, thereby ensuring the long-term reliability of our cured-in-place pipe.
Finally, enough resin is placed in the tube during wet out to completely impregnate the felt in our Insituform® CIPP tube and create the desired thickness. We add extra resin to compensate for irregularities in the host pipe. This process creates a pipe which fits tightly against the host pipe to maximize buckling resistance and minimize infiltration.
Resins that have been specifically chosen for sewer applications are selected and tested. We could choose any number of resins for our Insituform® process but continue to use polyester resin because it is the most cost-effective, reliable and durable solution on the market. Independent testing and the more than 40,000 km of CIPP we’ve installed in sewer rehabilitation projects since 1971 prove it.
What makes Insituform’s polyester resin better than other sewer rehabilitation resins?
- It’s stronger.One of the most important properties of any sewer rehabilitation product is its flexural modulus of elasticity. Independent tests show that the flexural modulus of Insituform’s standard sewer resin exceeds ASTM F1216 requirements.
- It has better long-term buckling resistance. In a study funded by the United States’ Government, the long-term buckling resistance of sewer rehabilitation products was evaluated. Insituform’s standard polyester resin demonstrated excellent long-term properties with a design life well in excess of 50 years.
- It cures reliably.Insituform’s polyester resins cure rapidly, even in the presence of water. These rapid cure cycles ensure that a proper cure can be achieved under all project conditions.
- It is resistant to corrosion.Independent tests have found that Insituform® CIPP installations completed in 1971 still show no signs of chemical attack or strength loss, despite continuous exposure to sewage, laundry effluent of an elevated temperature and caustic products. What’s more, the resins we use today are far superior to those early formulations – and are specifically designed for use in today’s more acidic sewers.
CIPP Technical Envelope
he following table refers to general purpose municipal sewer cured-in-place pipe projects. Insituform® can provide CIPP products that extend beyond these parameters through our engineering group. Contact us for additional information.
|Diameter range||150mm to 2500mm|
|pH range||0.5 – 10.5|
|Effluent temperature||up to 60°C|
|Fully deteriorated condition||Yes|
|Partially deteriorated condition||Yes|
|Diameter changes||Yes, without manhole access|
|Thickness changes||Yes, without manhole access|
|Typical shot length||70 to 350 m|
|Host pipe shape||All shapes|
|Host pipe material||All materials|