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Lateral: T-Liner®

Our History

LMK’s T-Liner® is a one-piece homogenous main and lateral CIPP connection liner. Both the mainline and lateral sections are formed as a structural cylinder that renews 18-inches and 360-degrees of the mainline and extends up the lateral pipe as one continuous lining.

    ASTM F2561

    Standard Practice for Rehabilitation of a Sewer Service Lateral and Its Connection to the Main Using a One Piece Main and Lateral Cured-in-Place Liner

    Significance and Use

    Purchase the full version of this standard by visiting the ASTM website here. This practice is for use by designers and specifiers, regulatory agencies, owners, and inspection organizations who are involved in the rehabilitation of sewer service laterals and its connection to the main through the use of a resin-impregnated tube installed within an existing sewer lateral. As for any practice, modifications may be required for specific job conditions.

    1. Scope

    1. This practice covers requirements and test methods for the reconstruction of a sewer service lateral pipe having an inner diameter of 3 to 12 in. and its connection to the main pipe having an inner diameter of 6 to 24 in. without excavation. The lateral pipe is accessed remotely from the main pipe and from a lateral cleanout. This will be accomplished by the installation of a resin impregnated one-piece main and lateral cured in-place lining (MLCIPL) by means of air or water inflation and inversion. The MLCIPL is pressed against the host pipe by pressurizing a bladder and is held in place until the thermoset resins have cured. When cured, the MLCIPL shall be a continuous, one piece, tight fitting, corrosion resistant lining extending over a predetermined length of the lateral pipe and the adjacent section of the main pipe providing a verifiable non-leaking structural connection and seal.
    2. The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.
    3. There is no similar or equivalent ISO Standard.
    4. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Particular attention is drawn to those safety regulations and requirements involving entering into and working in confined spaces.

    2. Referenced Documents

    1. D1600 Terminology for Abbreviated Terms Relating to Plastics
    2. D3681 Test Method for Chemical Resistance of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe in a Deflected Condition
    3. D5813 Specification for Cured-In-Place Thermosetting Resin Sewer Piping Systems
    4. D618 Practice for Conditioning Plastics for Testing
    5. D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
    6. F1216 Practice for Rehabilitation of Existing Pipelines and Conduits by the Inversion and Curing of a Resin-Impregnated Tube
    7. F412 Terminology Relating to Plastic Piping Systems
    8. Recommended Specifications for Sewer Collection System Rehabilitation

    Index Terms

    ambient cure; continuous; cured in place pipe; epoxy; felt; hydrophilic o-rings; inflation; inversion; knit; lateral identification; lateral pipe; lateral tube; launcher; liner/bladder assembly; main pipe; main sheet; main to lateral connection; MLCIPL; one-piece; resin; sewer lateral lines; sheet; steam cure; TEE; textile sheet; textile tube; transition; translucent bladder; tube; vacuum impregnate; WYE; ICS Number Code 93.030 (External sewerage systems)


    DOI: 10.1520/F2561-17

    For a copy of the ASTM F2561 Standard please visit

    Case Studies and Articles

    Insignia Gasket Sealing Technology

    The Myth, the Fact and the Legend: Insignia Hydrophilic Sealing System
    Sahar Hasan, Applications Engineer and Kristina Kiest, Director of Marketing
    Published in Trenchless International Magazine, October 2012

    Gasket Sealing Technology: A Solution to Sealing Deficiencies in Cured in-Place Pipe Lining
    Kristina Kiest and John Vose
    Presented at NASTT No-Dig March 2012

    T-Liner Main-To-Lateral Connection And Vac-A-Tee Cleanout

    A Comprehensive Understanding of ASTM F3097-15 “Standard Practice for Installation of an Outside Sewer Service Cleanout through a Minimally Invasive Small Bore Vacuum Excavation”
    Rick Gage and Amana Arayan
    Presented at NASTT No-Dig March 2016

    Sealing the Connection for Large Diameter Pipes, Trenchlessly
    Mike Czipar and Amana Arayan
    Presented at NASTT No-Dig March 2016

    Rehabilitation of the Coral Gables Wastewater Collection System
    Sahar Hasan, Mark Gulyas, and Jorge Acevedo
    Presented at NASTT No-Dig April 2014

    A Technique for Renewing a Section of Mainline Pipe while Simultaneously Renewing Multiple Service Lateral Pipes through the Use of Continuous CIPP
    Larry Keist and Sahar Hasan
    Presented at NASTT No-Dig 2012

    Lining Laterals in Las Olas
    Kristina Kiest
    Published in Trenchless Technology Magazine, October 2010

    A Comprehensive Understanding of ASTM F2561-06 “The Standard Practice for Rehabilitation of a Sewer Service Lateral and its Connection to the Main Using a One-Piece Main and Lateral Cured-in-Place Liner.”
    Larry Kiest, Jr. and Rick Gage
    Presented at NASTT No-Dig March/April 2009

    Trenchless Technologies; Quicker, Cleaner, Greener and Cheaper Ways to Get the Job Done
    Kristina Breese
    Published in the Professional Engineer, Spring 2008

    Multiple Technologies – Maximum Flow Reduction
    Northcrest-Afton Sewer Rehabilitation Project, New Castle County, Delaware

    James W. Shelton and Michael T. Harmer
    Presented at Mediterranean No-Dig, September 2007

    The Lateral Lining Market Has Arrived: Lateral Work is Being Completed in All Corners of the World with More on the Way
    Joan Blythe
    Published in Trenchless Technology Magazine, April 2007

    Trenchless Rehab from the Engineer’s Perspective
    James W. Shelton
    Published in Trenchless Technology Magazine, October 2006

    Prince William County Service Authority Project Case Study
    Shaun Flannery and Larry Kiest, Jr.
    Published 2005

    Wisconsin Raises the Bar Utilizing T-Liner
    Shaun Flannery
    Published 2003

    Fighting the Tide; Installing and Rehabilitating Sewers Using Trenchless Techniques; Boston Water & Sewer Commission
    Irene McSweeney Woodfall, P.E. and Michael Oliveira
    Conference Proceedings, NASST No-Dig 2000

    A Case Study In Infiltration Reduction through Trenchless Technology
    South Palos Township Sanitary District, Cook County, Illinois

    Aaron E Fundich, P.E. and Larry W. Kiest, Jr.
    Published March 1999

    Lateral Lining

    Local Ordinances Dictate Lateral Renewal Technologies
    Larry Kiest and Rick Gage
    Presented at NASTT No-Dig 2010

    Portland BES Advances in Sewer Maintenance and Repairs by Operating Multiple CIPP Crews
    Joe Dvorak and Larry Kiest, Jr.
    Presented at NASTT No-Dig April 2007

    Criteria for an Effective Lateral Renewal Project Utilizing Trenchless Technology
    Larry Kiest
    Presented at American Society of Civil Engineers (ASCE), New Pipeline Technologies, 2003

    Lateral Thinking
    Keith Gribbins
    Published in Trenchless Technology Magazine, April 2002

    Lined Main Tap

    Every Lateral in Dane County gets a new Connection Using the LMK Lined Main Tap
    Kristina Kiest and Larry Kiest
    Published February 2011


    The Most Cost Effective Method for Eliminating Inflow
    Larry Kiest
    Presented at American Society of Civil Engineers (ASCE), Pipelines, 2006


    The Inspector is the Gatekeeper to a Successful CIPP Installation
    Larry Kiest, Gerry Muenchmeyer, and Amana Arayan
    Presented at NASTT No-Dig 2015

    Protocols for the Quantification of Water-Tightness of a Rehabilitated Main/Lateral Sewer Connection
    Rick Gage
    Presented at NASTT No-Dig March 2011

    Making it Stick; Contractors repairing sewer laterals with CIPP linings need to consider multiple factors that affect the quality of the lateral-to-main connection
    Larry Kiest, Jr.
    Published at the Pumper & Cleaner Environmental Expo International, February 2006

    Verifiable Non-Leaking Connection Where No Water Migrates
    Larry Kiest and Shaun Flanery
    Presented at NASTT No-Dig 2005

    Testing Top Hat Liners and Robotic Systems for Repair of Lateral Connections
    Dr. -Ing. Bert Bosseler and Dipl.-ing. Gunther Kaltenhauser
    IKT – Institute for Underground Infrastructure, Published June 2004