Trenchless Technology Center
Louisiana Tech University

Water Environment Research Foundation

Rehabilitation of defective sewer laterals restores impaired structural integrity and reduced hydraulic capacity of these pipes, as well as improves the leak-tightness of pipes and connections and hence eliminates or minimizes groundwater infiltration into the sewer system and/or exfiltration of wastewater into the surrounding soil. Rehabilitation also prevents root intrusion through defects into the pipes, which is a serious problem for many agencies.

Sewer laterals can be repaired or replaced either over their entire length or only in selected parts.

A number of trenchless rehabilitation methods have been developed for the purpose of lateral repair—the principal methods in use today being cured-in-place (CIP) relining products, replacement by pipe bursting, chemical grouting, and flood grouting. Robotic repairs are a relatively new method, whereas mechanical repair sleeves for sectional repair of laterals are less frequently used.

The lateral rehabilitation methods shown below are included in our database. Click on the link to see details.
CIP Relining
  CIP, Standard Liners
  CIP, Remotely Inverted Standard Liners
  CIP, T-Liners
  CIP, Short T-Liners
  CIP, Top Hats
Pipe Bursting
  Static Pull
  Pneumatic Bursting
Lateral Chemical Grouting
  Grouting, Mainline Packers
  Grouting, Push Type Packers
Flood Grouting
Robotic Repairs
  Robotic, Pressure Applications
  Robotic, Non-Pressure Applications
Mechanical Repair Sleeves
Flood Grouting

Flood grouting is utilizing an exfiltration sealing process to simultaneously seal manholes, mainlines and laterals in one setup. Two proprietary chemical solutions are consecutively applied to “flood” an isolated section of sewer, where they exfiltrate through defects in pipes and manholes into the soil and chemically react with each other. The cured grout in the soil is a watertight sandstone-like silicate.

The method eliminates infiltration but does not provide structural enhancement and is intended for rehabilitation of structurally sound pipes only. Hydraulic capacity remains generally unchanged. Flood grouting is most suitable when there are many leaks “everywhere” (both in laterals and mainlines) and when the lateral pipes are very deep and/or with many bends. Cleanouts are needed and access to private property is required.

Product/System NameSanipor®
Web Site
Product Material
Product CureAmbient
Lateral, Pipe Type3 in. (Any)
Lateral Dia, Min12 in. (Any)
Lateral Dia, MaxAny
Lateral Dia, TransitionYes
Repair in Lateral, Max300 ft (Any)
Mainline Dia, Min6 in. (Any)
Mainline Dia, Max36 in. (Any)
Repair in Mainline300 ft (Any)
Bends in Lateral, 90sAny
Offset of Joints, MaxAny
Lateral Protruding, MaxYes
Active Leaks (Heavy)No
Lateral CleaningYes
Cleanout (1 or more)Yes
Pit(s) ExcavationNo
Entering Private PropertyYes
Lateral PluggingYes (8 hrs)
Mainline PluggingYes (8 hrs)
Structural RepairNo
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