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
Grouting, Mainline Packers

Grouting from mainline is carried out using a packer that is inserted through the manhole and driven through the mainline until it reaches the lateral connection, where the test-and-seal procedure is performed. The grouting is usually performed on a lateral-to-mainline connection and the first several feet (1 ft-6 ft) of the lateral, although it is possible to grout longer lengths. It is often done after relining of mainlines (to seal the exposed annular space after reopening of the lateral connections), but is also done as a standalone repair of defective connections.

CompanyLogiball Inc.
Product/System Name2001L Lateral Injection Packers
Product Material
Product CureAmbient
Lateral, Pipe TypeAny
Lateral Dia, Min4 in.
Lateral Dia, Max6 in.
Lateral Dia, Transition-
Repair in Lateral, Max20 ft
Mainline Dia, Min6 in.
Mainline Dia, Max30 in.
Repair in Mainline24 in.
Bends in Lateral, 90sOne 90 deg
Offset of Joints, Max1/4 in.
Lateral Protruding, Max1/4 in.
Active Leaks (Heavy)Yes
Lateral CleaningYes
Cleanout (1 or more)No
Pit(s) ExcavationNo
Entering Private PropertyNo
Lateral PluggingNo
Mainline PluggingNo
Structural RepairNo
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