Solution

Cheyenne Water Distribution System

Cheyenne, WY

Service: Structural Design

Market: Water/Wastewater

Keywords: Concrete-Prestressed, Condition Assessment, Corrosion, Failure Risk Assessment, Pipeline

Client

Cheyenne, Board of Public Utilities

Completion

2003

The water distribution system in Cheyenne includes four prestressed concrete cylinder pipelines (PCCP), approximately 13.5 mi long. The 16 to 30 in. dia., lined-cylinder pipes (LCP) were installed between 1950 and 1962. Three of the PCCP carry raw and treated water, and the fourth is a part of the distribution system. SGH assessed the condition of all four lines while they remained in service.

Scope | Solutions

Highlights of SGH's work include the following:

Data collection and review of historical records
Corrosion survey including electromagnetic conductivity testing
Geotechnical and groundwater investigations
External test-pit inspection of pipe
Testing of mortar coating and prestressing wire samples
Hydraulic transient analysis
Structural evaluation of LCP
Failure risk analysis of pipe assuming broken prestressing wires and corroded steel cylinder

We found that the lines had performed well, and there were no systematic factors that presented a significant risk of future failure.

Simpson Gumpertz & Heger

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Cheyenne Water Distribution System

Client

Completion

Scope | Solutions

Project Contact(s)

Rasko Ojdrovic

Mehdi Zarghamee