Trenchless Technology


Trenchless Technology includes the development of specifications, design of liner wall thickness, testing of materials, and expert opinion of completed work. Brian M. Rohan, PE has been the task group chairman for ASTM Standards in this field.

Trenchless Technology Pipe Rehabilitation Projects Include:

  • Sanitary and Storm Water Sewers
    • Finite Element Analysis
  • Manhole and Laterals
  • Water Mains, Force Mains, & Reclaim Water

Rohan Engineering, P.C. provides professional engineering services for pipe evaluation and replacement, and "trenchless" pipe rehabilitation throughout North America. With over 40 years of pipe design experience, Rohan Engineering is established as an authority on evaluation, design and construction supervision for Slip-Line, Cured-In-Place, Deformed-Reformed, Folded-Formed, Epoxy Lining, and Shotcrete Technologies. 

Rohan Engineering has been responsible for recommendation and design of the most appropriate and cost effective "trenchless technology" for various pipe and manhole rehabilitation applications.

Our Expertise Includes:

  • Design Services
    • Finite Element Analysis (FEA) of liner wall thickness
  • Evaluation of Field Inspection data
  • Pre-bid analysis of Project designs
  • Contractor Pre-qualification
  • Construction Phase Services
    • Submittal review

 Rohan Engineering's has experience with a variety of different pipe materials, pipe replacement materials, and pipe rehabilitation processes.

Project Variety Includes:

Host Pipe Materials Rehabilitation & Replacement Materials Rehabilitation Process
  • brick
  • vitrified clay
  • reinforced concrete
  • transite
  • asbestos cement
  • cast iron
  • ductile iron
  • steel                                                                               


  • polyvinyl chloride
  • polyethylene
  • resin/cloth
  • resin/fiberglass
  • thermo-plastic/grout-in-place
  • fiberglass/sand/resin matrix                                                                                     
  • 4" to 6" sewer lateral pipe rehabilitation by lining
  • 6" to 18" pipe rehabilitation by Folded-Formed and Deformed-Reformed
  • 6" to 72" pipe rehabilitation by Cured-In-Place
  • 42" to 132" pipe rehabilitation by Shotcrete
  • 8" to 120" pipe rehabilitation by Slip Lining and Roll-Down, and Machine Wound
  • 24" to 96" pipe replacement and rehabilitation by Thermo-Plastic/Grout-In-Place Liner, Glass Reinforced Plastic "GRP" Liners, and Centrifugally Cast Fiberglass Reinforced Polymer Mortar Pipe