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
CIP, Remotely Inverted Standard Liners

Remotely inverted standard liners utilize a robotic platform for the inversion of liner from the mainline , which in the process creates a brim in the mainline around the lateral connection opening (needed as an anchor). Thus, CIP ling liners ‘combine’ standard and short connection liners. These liners typically extend up to 25 or 30 ft into the lateral.

These liners are most suitable when lower laterals need to be repaired and there is no other access to the lateral, i.e., there are no cleanouts that could be used for liner inversion nor is the excavation of pits acceptable or possible.

CompanyPerma-Liner Insituform Masterliner Inc.
Product/System NameInnerSeal™ Innerwrap™ Insituform® CIPP INSTA "T"
Product Material
InstallationRemote Inversion Remote Inversion Remote Inversion
Product CureAmbient or Steam Ambient, Hot Water or Steam Ambient, Hot Water or Steam
Lateral, Pipe TypeAny Any Any
Lateral Dia, Min4 in. 4 in. 4 in.
Lateral Dia, Max8 in. 8 in. 6 in.
Lateral Dia, TransitionYes Yes Yes
Repair in Lateral, Max75 ft 25 ft 50 ft
Mainline Dia, Min6 in. 6 in. 8 in.
Mainline Dia, Max36 in. 36 in. 12 in.
Repair in Mainline3 in. brim 3 in. brim 3 in. brim
Bends in Lateral, 90sOne 90 deg Multiple 90s Multiple 90s
Offset of Joints, Max1 in. < 40 % dia < 40 % dia
Lateral Protruding, Max1/4 in. 1/4 in. 1/4 in.
Active Leaks (Heavy)No No No
Lateral CleaningYes Yes Yes
Cleanout (1 or more)No No No
Pit(s) ExcavationNo No No
Entering Private PropertyNo No No
Lateral PluggingYes (3 hrs) Yes (3 hrs) Yes
Mainline PluggingYes (3 hrs) Yes (3 hrs) Yes (2-3 hrs)
Structural RepairYes Yes Yes
Copy Right: TTC Louisiana Tech University
Ruston, LA