CIPP Overview

Using Cured in Place Piping (CIPP) continuous inversion, Hill Services has the ability to line pipelines with diameters ranging from 2″ to 48″ in most cases less than a day. This “true” inversion method allows Hill Services to negotiate 22’s, 45’s and 90’s with ease. Our liner material allows our installers to line through transitions without changing the structural properties of the liner.

Some benefits of our CIPP Inversion Process:

  • Formulated Epoxy Resins
  • Stop Inflow and Infiltration (I&I)
  • Re-Line 22’s, 45’s & Sweeping 90’s
  • NSF Standard 14 Approved
  • Eliminate Root Intrusion\
  • Bridge Missing Pipe Sections
  • Increase Flow Efficiency
  • Minimum Design Life 50 Years (Tested)
  • Non-Woven / No Stretch Liner
  • Single Point of Access for Lining
  • Seal Open Joints
  • Prevent Pipe Failure
  • Reline Different Size Transitions
  • IAPMO Certified

We offer the following in Trenchless Technology:

  • Cured in Place Piping (CIPP)
  • Air pressure continuous Inversion up to 1,000’ runs
  • Pipe diameters of 2” to 60”
  • Pull in Place liners
  • Point repair installations
  • Negotiating multiple bends or turns in piping
  • Hot water curing
  • Steam curing
  • Ambient curing
  • Robotic reinstatements up to 24” in diameter


How the CIPP Process Works:

A resin-saturated felt tube made of polyester is inverted or pulled into a damaged pipe. It is usually done from the upstream access point (manhole or excavation). It is possible to invert the liner upstream (e.g. from the downstream access point) but this carries greater risk. It is possible to install a liner from the downstream access point, upstream to a blind end however this carried the highest risk of all the CIPP installation methodologies. Little to no digging is involved in this trenchless process, making for a more environmentally friendly method than traditional “dig and replace” pipe repair methods. The liner can be inverted using water or air pressure. The pressure required for inversion can be generated by using pressure vessels. Hot water, ambient cured or steam is used to cure the resin and form a tight-fitting, joint less and corrosion-resistant replacement pipe. Service laterals are restored internally with robotically controlled cutting devices. These can be sealed with additional seals into the lateral connection (Lateral Junction Repair). The rehabilitated pipe is then inspected by closed-circuit television (CCTV). CIPP is considered a trenchless technology. 


 As a trenchless technology, CIPP does not require excavation to rehabilitate a pipeline that is either leaking or structurally unsound. Depending upon design considerations an excavation may be made, but the liner is often installed through a manhole or other existing access point. Anything larger than 60″ must be excavated in order to install. Liner is installed as it is wet out on site in these instances. In the case of sewer lines, lateral connections are also restored without excavation via a remote controlled device that drills a hole in the liner at the point of the lateral connection. If larger than 24″ and it is safe to do so someone will reinstate laterals by hand. CIPP has a smooth interior and no joints. While CIPP can repair a pipe with bends, special design considerations must be taken into account to prevent wrinkling and stretching. CIPP can effectively reduce infiltration and leaks in pipeline systems without digging.

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