TECHNICAL PAPERS


WHAT'S IN THE NUMBERS? A REVIEW AND ANALYSIS OF MORE THAN 400 MILES OF FORCE MAIN INSPECTION AND CONDITION ASSESSMENT DATA

November 1, 2014

Comprehensive condition assessment of wastewater force mains provides significant challenges to owners/operators of collection systems as the ability to shut down or expose the pipeline for a thorough inspection is often impractical due to operational and/or financial considerations. Traditional gravity sewer inspection techniques (i.e. visual based technologies) do not always transfer easily to their wastewater pressure pipe counterparts and visual assessments do not provide the structural condition of force main – something that is critical in determining the true pipe condition. Therefore, a different set of inspection tools and assessment techniques is required for force mains.

Read More
NUMBERS DON’T LIE, PCCP PERFORMANCE AND DETERIORATION BASED ON A STATISTICAL REVIEW OF A DECADE OF CONDITION ASSESSMENT DATA

October 24, 2014

Since the late 1990s there have been numerous inspection and monitoring projects focused on identifying and quantifying wire break damage in PCCP water and wastewater pressure mains.

Read More
FAILURE RISK OF BAR-WRAPPED PIPE WITH BROKEN BARS AND CORRODED CYLINDER

October 1, 2014

This study investigates the behavior of a deteriorating BWP under various levels of distress and various internal pressures. The results based on a 24-inch pipe transmission main, are used to define criteria to evaluate the performance of a damaged BWP. Based upon the finite element results obtained in this study, suggestions for future work are presented and discussed.

Read More
REVISITING THE TOPIC OF LIABILITY FOR DAMAGE DUE TO WATER MAIN BREAKS OR LEAKS

September 1, 2014

The topics of liability and negligence as they relate to water main failures are discussed from both a historical and current viewpoint. The historical perspective is provided in a 1948 Journal AWWA article, and we consider changes in liability issues from that time to the present. Case studies from various states are also presented that will provide water utilities insights into sovereign immunity and what constitutes discretionary function.

Read More