Cheyenne Water Distribution System Pipelines

Cheyenne, WY

This water distribution system includes four PCCP lines, 13.5 miles long. The 16-to-30-inch diameter lined cylinder pipes (LCP) were installed between 1950 and 1962. While the lines were in service, we performed 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 the LCP; and failure risk analysis of pipe assuming broken prestressing wires and corroded steel cylinder. SGH found the lines had performed well, and there were no systematic factors that presented a significant risk of future failure.

Service Provided:
Investigation

Supporting Capabilities:
Engineering Mechanics