What are Cured-in-Place Pipes?
Cured-in-place pipe (CIPP) is a innovative trenchless technology used to rehabilitate existing pipelines without the need for excavation. It involves installing a resin-saturated felt tube or liner into the original pipe using minimal access points. The liner is then expanded and pressed against the interior walls of the host pipe using hot water or steam. The resin is then cured using hot water, hot air or UV light to harden the liner into a new pipe within the old pipe.
The Benefits of CIPP
CIPP provides several key benefits over traditional pipe replacement methods that require excavation:
- Minimal disruption: Cured-In-Place Pipe installation requires just two small access points allowing pipelines to remain operational with minimal traffic or resident disruptions.
- Cost effective: CIPP rehabilitation costs a fraction of replacing pipes through open-cut excavation, providing significant long-term savings for utility owners.
- Structural enhancement: The cured liner becomes an entire new structurally sound pipe within the host pipe increasing its structural integrity and extending its useful life by 50-100 years.
- Trenchless installation: No need to dig up streets, yards or intersections reducing environmental impacts and restoration costs.
- Smoother interior: CIPP installation results in a very smooth interior pipe surface that improves flow characteristics.
Applications for CIPP
Cured-in-place pipe technology has proven effective for renewing a wide variety of pipeline materials and diameters including:
- Concrete, clay, ductile iron, PVC and asbestos cement pipes
- Gravity lines such as sanitary sewers and storm drains
- Pressure pipelines including water mains and service lines
- Diameters ranging from 4 to 96 inches allowing rehabilitation of large interceptor sewers.
The CIPP Process
The CIPP process typically involves five basic steps:
1. Interior inspection - CCTV cameras are used to inspect the interior of the host pipe to locate any defects or blockages prior to rehabilitation.
2. Pipe preparation - The interior of the pipe is cleaned using high-pressure water jets to remove debris, scale or roots in preparation for liner installation.
3. Liner impregnation - The flexible tube is saturated with thermosetting resin prior to installation to strengthen it and allow it to cure into a rigid pipe within the host pipe.
4. Installation - The saturated liner is inserted into the host pipe using an inversion process whereby it is pulled into place from one access point to the next using water or air pressure.
5. Curing - Once fully in place, the liner material is then cured using hot water or steam to harden the resin and shape it to the contours of the host pipe. UV light curing is also an option.
CIPP Quality Assurance
For long-term structural integrity, quality assurance is essential throughout the cured-in-place pipe process and materials selection. Standards ensure proper materials handling, wet-out, installation practices and curing are achieved. Key aspects include:
- Liner materials meeting ASTM standards for flexibility, burst strength and impermeability.
- Resins cured to achieve proper material properties and structural enhancement factors per design.
- Documentation of liner thickness, tube placement inspection and final condition assessment post-cure.
- Industry certifications assure contractor competency and adherence to quality installation requirements.
Over 2 million cured-in-place pipe lining installations have been successfully completed worldwide rehabilitating pipelines in a cost-effective, minimally invasive manner. With an anticipated 50-100 year design life, CIPP provides municipalities and utilities with a modern solution to renew aging water, sewer and storm infrastructure and extend the useful life of the existing pipe system for generations to come.
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