Trenchless Pipeline Renewal Method Selection

The decision, by an engineer, designer, municipal official or anyone else, of how to accomplish the renewal of a deteriorated buried pipe in an urban or suburban environment without excavation must be based on readily available parameters for the existing pipeline being examined. One approach is to search the Internet, call different technology providers, talk to other professionals and accumulate data pertinent to the type, size and configuration of pipeline that needs to be renewed or rehabilitated. This approach is very time-consuming and will probably result in a limited amount of data for a limited number of technologies.

The preferred approach is to have a fully automated software program available that includes all available technology parameters in a single, easy-to-use and accessible software program. Such a tool was recently commissioned by NASSCO and developed by the Trenchless Technology Center (TTC) at Louisiana Tech University and is called the Trenchless Assessment Guide-Rehabilitation (TAG-R).

This automated program was developed by assembling available parameters from technology providers throughout the industry including diameter, length, ability to perform fully structural repairs, configuration and many other data points. These parameters were included in the computer software program to create a decision support tool that simplifies this decision process for engineers, estimators and anyone else looking for a trenchless renewal solution.

NASSCO and TTC worked to develop a comprehensive , straightforward, user-friendly, interactive software for the evaluation of alternative trenchless renewal methods. This software can be used to determine which technology best fits the input parameters for the renewal of gravity sanitary, storm and combined sewers; pressure pipes, both potable and non-potable; lateral pipes; and manholes. Over 90 technologies can be evaluated by TAG-R for all of the collection system components contained in the software program. The software emphasizes simplicity and limits input data to what is normally readily available to utility and municipal engineers at the design stage of a renewal project.

TAG-R performs a technical evaluation, which is based on the user?s input, during which the technical capabilities of each of the various technologies identified in the program are compared with the project requirements that are input into the software program. If a technology is not capable of meeting any of the project requirements it is excluded from further consideration by the software program. Once an evaluation is complete, the user will be provided with a list of all of the technologies that passed the evaluation along with their technical parameters.

The TAG-R program takes into account extensive performance data for a number of pipeline renewal technologies and sub-technologies for access point to access point pipe renewal, a number of pipeline spot repair technologies and manhole renewal methods commonly used in conjunction with collection system renewal projects.

The software was designed with two primary goals in mind. The first goal was to develop fully automated, stand-alone software that can assist decision-makers in evaluating the technical feasibility of various renewal methods for a specific project. The second goal was to raise awareness and provide guidance for the user in the utilization of trenchless technologies for collection system renewal projects. TAG-R, compatible with Microsoft operating platforms such as Windows XP, VISTA, Windows 2000 and Windows 7, is available from NASSCO.

TAG, a sister software program dealing with new installations and in-line replacement methods was previously developed in collaboration with the National Utility Contractors Association (NUCA) and is available through that organization. The combination of the two software programs is the most extensive method selection software of its type, allowing designers to simultaneously evaluate the suitability of trenchless construction methods covering the installation, replacement and renewal of gravity, pressure, lateral pipes and manhole structures. The combined software is currently available online for evaluation and testing at

John C. Matthews, Ph.D., is a Post-Doctoral Research Associate for the Trenchless Technology Center (TTC) at Louisiana Tech University, Ruston, La.

Gerhard ?Gerry? P. Muenchmeyer, P.E.
, is technical director of the National Association of Sewer Service Companies (NASSCO).

Trenchless Methods
Sewer Polymer Coating (Man Entry) Potable & Non-Potable Water
(Sanitary, Storm and Combined) Polymer Coating (Non-Man Entry) Potable & Non-Potable Water
Method Type Mechanical Seal Potable & Non-Potable Water
CIPP Inversion (Structural) Full Lining  
CIPP Inversion (Non-Structural) Full Lining Lateral
CIPP Pulled In (Structural) Full Lining Method Type
CIPP Pulled In (Non-Structural) Full Lining CIPP Inversion (Inside-Out) Laterals
Folded Pipe (Structural) Full Lining CIPP Inversion (Outside-In) Laterals
Folded Pipe (Non-Structural) Full Lining CIPP Pulled-In (Outside-In) Laterals
Sectional Sliplining Full Lining Chemical Grouting Laterals
Segmental Sliplining Full Lining Continuous Sliplining Laterals
Continuous Sliplining Full Lining Folded Pipe Laterals
Spiral Wound (Not Grouted) Full Lining Full Wrap Tee Connection SealsResin Hat Connections Connection Seals
Grout in Place Liners (PVC) Full Lining Fused Hat Connections Connection Seals
Grout in Place Pipe (HDPE) Full Lining Grouted Connection Seals
Structural Panel Lining Full Lining Robotic Connection Seals
Concrete Spray-On Coating (Man Entry) Full Lining    
Polymer Coating (Man Entry) Full Lining Manhole
Polymer Coating (Non-Man Entry) Full Lining Method Type
Flood Grouting Full Lining Chemical Grout Maintenance
CIPP Sleeves Spot Repair Cementitious Repair Maintenance
Mechanical Sleeves Spot Repair Channel Inserts Maintenance
Mechanical Joint Seals Spot Repair Chimney Seals (Mechanical) Maintenance
Chemical Grouting Spot Repair Chimney Seals (Polymer) Maintenance
Robotic Injection Spot Repair Chimney Seals (CIPP) Maintenance
Rerounding Spot Repair Barrel Joint Seal (Mechanical) Maintenance
  Barrel Joint Seal (Polymer) Maintenance
Water Inflow Dish Maintenance
Method Type Cementitious Coating Coating
CIPP Inversion (Structural) Non-Potable Water Epoxy Coating Coating
CIPP Inversion (Non-Structural) Potable & Non-Potable Water Polyurethane Coating Coating
Folded Pipe (Mechanical) Potable & Non-Potable Water Protective Liner (HDPE) Corrosion Protection
Folded Pipe (PVC) Potable & Non-Potable Water Protective Liner (PVC) Corrosion Protection
Reduced Diameter Pipe (PE) Potable & Non-Potable Water Modified Polymer Skin Panel Corrosion Protection
Hose Liners Non-Potable Water Cementitious Cast in Place Structural
Continuous Sliplining Potable & Non-Potable Water Cured-in-Place Liner Structural
Segmental Sliplining Potable & Non-Potable Water FRP Inserts Structural
Concrete Spray – On Liner (Man Entry) Potable & Non-Potable Water    
Cement Coating (Non-Man Entry) Potable & Non-Potable Water    


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