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, T-Liners

CIP T-liners add a short full-circle mainline seal (12-16 in.) to a standard CIP liner. The two parts are factory welded thus becoming a one-piece liner. T-liners are installed remotely through the mainline. Some T-liners add hydrophilic rubber bands between the mainline seal and the mainline host pipe to further ensure sealing in this area and prevent any infiltration from the annular space into the sewer pipe.

T-liners offer the most advanced approach of all lateral CIP liners for eliminating the infiltration coming from the laterals into the mainline. Typically, the access to private property is required.

CompanyLMK Technologies, Inc LMK Technologies, Inc
Product/System NameLMK T-Liner® Shorty™
Web Site
Product Material
InstallationRemote Inversion Remote Inversion
Product CureSteam Ambient or steam
Lateral, Pipe TypeAny Any
Lateral Dia, Min3 in. 3 in.
Lateral Dia, Max8 in. 8 in.
Lateral Dia, TransitionYes -
Repair in Lateral, Max200 ft 3 ft
Mainline Dia, Min6 in. 6 in.
Mainline Dia, Max24 in. 24 in.
Repair in Mainline16 in. 16 in.
Bends in Lateral, 90sBack-to-back 90 deg -
Offset of Joints, Max1-2 in. -
Lateral Protruding, MaxNo No
Active Leaks (Heavy)No No
Lateral CleaningYes Yes
Cleanout (1 or more)Yes No
Pit(s) ExcavationDepends No
Entering Private PropertyDepends No
Lateral PluggingYes (30 min) Yes (30 min)
Mainline PluggingYes (30 min) Yes (30 min)
Structural RepairYes Yes
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