Project Overview
Salt Lake City’s Upper Conduit is a critical water transmission pipeline constructed using multiple concrete pipe types, including prestressed concrete cylinder pipe (PCCP), reinforced concrete cylinder pipe (RCCP) and steel cylinder concrete pipe (SCCP). As part of ongoing infrastructure reliability efforts, Insituform Technologies, LLC (ITL) was contracted to deliver a pressure-rated cured-in-place pipe (CIPP) solution for a section of the conduit requiring structural rehabilitation.
Project Challenges
In January 2020, the City selected ITL to install a pressure-rated CIPP liner within approximately 560 linear feet of 48-inch PCCP. With previous positive experience using CIPP in gravity sewer applications, the City chose this approach specifically to:
- Maintain the maximum internal diameter of the existing water transmission pipeline
- Minimise disruption and avoid full pipe replacement
- Ensure the long-term structural and hydraulic performance of a key potable water asset
The rehabilitation needed to be completed ahead of seasonal increases in water demand, requiring a reliable and timely installation.
The Solution
In late April 2020, ITL successfully installed and pressure-tested an InsituMain® epoxy-resin pressure liner, returning the pipeline to service in time for heightened springtime water use.
The pressure-rated CIPP solution provided:
- Structural renewal of the host PCCP
- Preservation of internal diameter
- A corrosion-resistant, leak-proof composite pipe
- A trenchless installation method suitable for large-diameter potable water infrastructure
The project demonstrates the adaptability of InsituMain® for pressure pipeline environments and the effectiveness of CIPP as an alternative to open-cut replacement.
Pipeline Details and Project Summary
Project: Upper Conduit Slipline Project
Location: Salt Lake City, Utah
Project Dates: 2020
Pipe Length: 11,000 feet
Pipe Diameter: 48-inch
Existing Pipe Material: PCCP
CIPP System: Pressure-rated epoxy resin liner
Installation Method: Inversion
Average Shot Length: 560 feet
Pressure Rating: 60 psi
Owner: Salt Lake City Corporation
Engineer: J-U-B Engineers
Affiliated Contractors: Cliff Johnson Excavating and Insituform Technologies, LLC
Client Feedback
“We have used cured-in-place pipe lining on gravity sewer projects with great success. This was a primary reason for selecting CIPP to rehabilitate this section of potable waterline. Insituform worked closely with us through installation challenges for a successful project.”
– Dawn Wagner, PE, Water Program CIP Manager, Salt Lake City Corporation
