Introduction to the Cornerstone of Trenchless Technology:

Cured-in-Place Pipe Lining (CIPP)

The Shape of Things to Come CIPP is a resin-saturated felt tube or robust ‘sleeve’ composed of polyester that is inverted or pulled into aging and damaged sewer pipes. Typically, the CIPP lining tube is inserted into the damaged pipe with either air pressure or water pressure. Hot water or steam is used to cure the resin which then forms a solid impregnable mass that lines the interior dimensions of a sewer pipe, taking the form of the pipeline’s interior and shape and providing a seamlessly tight fitting, jointless, and corrosion-resistant lining to the existing pipeline.

Precision Monitoring, Accuracy, and Response Installation of CIPP allow service laterals to be restored internally through the use of robotically-controlled cutting devices (or by hand for significantly large sewer pipes), and ultimately inspected via closed-circuit television (CCTV).

Advantage: CIPP With the application of CIPP there is virtually no digging involved; hence the term “Trenchless Technology”. CIPP is recognized as an economical alternative to the traditional open-cut, dig-and-replace methodology generally used in the repair of sewer pipe. An additional advantage of CIPP is the fact that it is a significantly more environmentally responsible and much less disruptive method of the repair of compromised piping than the traditional method.

Strident Guidelines and Parameters All CIPP liners should be designed in accordance with the ASTM-F1216 07a, which takes a number of existing pipe parameters into consideration in order to determine the proper thickness of the liner to ensure its ultimate required performance. The required CIPP pipe design parameters are as follows:

• Depth of the sewer pipe
• Diameter of the sewer pipe
• Shape of the sewer pipe
• Ovality of the existing sewer pipe
• Existing condition of the sewer pipe (whether fully or partially deteriorated)
• Level of the ground water table
• Modulus of the surrounding soil
• Density of the surrounding soil
• Live load conditions
• Vacuum conditions
• Other loads (including railroad crossing, etc.)

For fully deteriorated pipe conditions, the design for the proper liner thickness must satisfy 4 complex equations:

1. Hydraulic loads due to groundwater
2. Minimum thickness for pipe ovality
3. Hydraulic, soil, and live loads
4. Minimum thickness for fully deteriorated pipe

Moreover, There’s the CWW Standard At CWW we design our CIPP liners for all of its projects based on the requirements of the customer and in accordance with specific site conditions. As a CWW quality standard, unless specified otherwise all of our CIPP liners are designed for fully deteriorated pipe conditions. This proactive and vigilant practice provides a dependable solution for any potential damage to a host sewer pipe. Whether the pipe begins to show signs of severe deterioration or totally disintegrates, CWW installation of its CIPP liners will structurally withstand defined loads, and operate under regular conditions for a minimum of 50 years.

CWW would introduce a structural liner to address the following sewer waste water issues:

• Excessive inflow and infiltration
• Increased cost in processing unnecessary ground water
• Reduction in expansion capacity of the sewage treatment plant

CWW’s structural liner is a continuous pipe-within-a pipe that is specifically engineered to meet structural requirements based on interior pipe size, configuration, and depth.

In Sum – Top-line CIPP Benefits

• Long-lasting and dependable structural rehabilitation
• Little to no site disruption or reinstatement
• Client’s business continues to move forward – business as usual – revenue uninterrupted
• A fiscally responsible/cost-effective solution that eclipses traditional dig-and-replace methods
• Environmentally responsible sewer pipeline rehabilitation methodology