Expansion of the Minera Escondida copper mine included constructing a corrugated steel structural plate arch tunnel. The tunnel acts as a buried bridge to carry a haul road over the mine’s conveyor system. During construction of the...
The Sonoma County Water Agency manages a regional water supply to ensure its customers have access to clean water. Wanting to preserve their assets, the agency needed to understand the condition of their aging transmission system pipelines to...
Constructed in the 1870s, the Beacon Street Line carries water under the MBTA Green Line tracks in the busy Brookline neighborhood. Massachusetts Water Resources Authority (MWRA) identified a leak in the 48-in. dia. cast iron pipe below the train...
In 2014, a five-story residence was constructed directly over DC Water’s North East Boundary Trunk Sewer (NEBTS) with only about 2 ft of soil between the bottom of the basement and the top of the 22-ft dia. masonry sewer. DC Water...
A conveyor belt runs along one of the canyon benches at the copper mine. The upper slope of the canyon was undergoing a slow and predictable landslide transverse to the conveyor belt. To protect the conveyor belt from falling debris due to the...
Contech Engineered Solutions (Contech) installs corrugated steel pipe (CSP) to form wind turbine foundations. After excavating, Contech installs the pipe vertically within the hole and quickly backfills around it with a concrete/slurry mix to...
During construction of the ITC Crossing development, sections of corrugated metal pipe (CMP) and reinforced concrete pipe (RCP) in the storm drainage system were found to be structurally distressed and damaged. SGH investigated the extent and...
Corrugated metal storm drain pipes running beneath the Paramus Mall parking lot were severely corroded and deflected. SGH investigated the pipes’ condition and developed rehabilitation options that would help minimize disruption to the mall...
Brandon Shores Power Plant (BSPP) has a proactive inspection and repair program for circulating water and service water pipelines, including prestressed concrete cylinder pipe (PCCP), steel pipe, ductile iron pipe, and others with diameters...
While attempting to install telecommunications lines below a creek, a driller punctured a buried, 48 in. dia. prestressed concrete cylinder pipe (PCCP). The pipe is part of Columbus’s water system that supplies water to more than one...
Since the beginning of carbon fiber reinforced polymer (CFRP) lining of pipes in the late 1990s, thousands of feet of pipe have been lined with CFRP in hundreds of projects across the United States. In the last decade, the author has been directly involved in the initial and final development of this technology and has applied it to pipes with various diameters, distress conditions, design loads, etc. in more than one hundred project
Graham Cranston presented Tuesday 12 April at the 2016 Annual Stability Conference hosted by the Structural Stability Research Council. His presentation title and abstract are below.
Title: Stability of Buried Corrugated Metal Pipe...
This paper presents the recent enhancements to Tarrant Regional Water District’s (TRWD’s) geographic information system (GIS)-based structural evaluation tool, how this tool is used to improve asset management capabilities,
The Carlsbad Desalination Project uses a pipeline to deliver water from a seawater desalination plant located near sea level to the San Diego County Water Authority’s Second Aqueduct connection facility located at an elevation of
Prestressed concrete cylinder pipeline (PCCP) condition assessment methods include an acoustic wave propagation testing technology (ePulse) to identify sections of pipeline with reduced structural stiffness. A recent innovation, ePulse,
Fiber Reinforced Polymer (FRP) composite lining systems are used by major municipalities throughout the United States to structurally rehabilitate and upgrade large diameter pipelines. For internal Carbon Fiber Reinforced Polymer (CFRP)
Arizona Public Service Company’s Cholla Power Plant has four units with circulating water lines made of 66 in. to 72 in. diameter prestressed concrete cylinder pipe (PCCP) in Units 2, 3, and 4. PCCP in these three units has been in
Hydrostatic pressure tests of prestressed concrete cylinder pipe (PCCP) with bands of broken wires and lined with carbon fiber reinforced polymer (CFRP) have shown that certain CFRP laminates used as liners for remediation of distressed
A rash of failures in PEX-AL-PEX piping in residential domestic hot water and hydronic heating systems in the United States and Canada led to an investigation into the nature and cause of the failures. Failures, which occurred after less...
Two-part series on BUILDERonline.com. Part One, titled “Winterization 101: The Science of Frozen Pipes,” provides a basic overview of why pipes freeze and break, and what can be done to prevent this from happening. ...