Abstract
Ever-tightening budgets are forcing water system owners to rehabilitate their major water transmission mains with permanent solutions, a key approach in their asset management programs. Halifax Water was recently faced with a deteriorating Prestressed Concrete Cylinder Pipe (PCCP) water transmission main that needed rehabilitation or replacement. This transmission main is located under Kearney Lake Road, a main high traffic level corridor on the west side of Halifax. The use of Spirally Welded Steel Pipe (WSP) with a unique O-ring rubber-gasket joint, allowed Halifax Water to successfully rehabilitate 4,920 LF (1.5 km) of a 48-inch (1200 mm) host PCCP primary transmission main by sliplining. This fully structural lining system provided a structurally independent solution designed to last 100 years. This paper details the innovative use of polyurethane lined and coated Steel Pipe with the unique joint that eliminated liner pipe bells and ensured that maximum internal flow area was provided by the lining system. OVERVIEW Halifax, Nova Scotia, not unlike numerous other municipalities in North America, developed their water transmission system using Prestressed Concrete Cylinder Pipe (PCCP). Beginning in 1952, Halifax began the development of the Pockwock Water Supply system to support the growing industrial and cultural dynamics of metro Halifax. In 1977, the Pockwock Water Supply system was brought online to provide high quality water and service to the taxpayers of Halifax. A primary water transmission main from one of the nine water supply plants operated by Halifax Water was constructed in 1977 along Kearney Lake Road, a major thoroughfare serving the west side of metro Halifax. This transmission main ranged in diameter from 30 inch (1050 mm) to 60 inch (1500mm). In the late 1980’s and throughout the 1990’s there were several major failures along the Kearney Lake Road transmission main. Halifax Water began repairs on this pipeline through the use of conventional open cut pipe removeand-replace methods. In 2001, construction began to twin approximately 5000 LF (1.5 km) of the pipeline along the areas that had failed over the last several years. This twining program was instituted because of growing concerns about the performance ability of this line over time. SOLUTION ALTERNATIVES In 2005, Halifax Water contracted with the Pressure Pipe Inspection Company (now owned by Pure Technologies) to use their Prestressed Concrete Cylinder Pipe PCCP assessment technology. The condition assessment program identified numerous prestressing wire breaks along the transmission main. These wire breaks created performance concerns and were repaired. Then in 2006 and 2007 respectively, two additional catastrophic failures occurred on this line. The latter failures demanded 1 Northeastern Regional Sales Manager, Northwest Pipe Company, 1050 N. State St. Mezzanine Suite 7, Chicago, IL 60610; Tel: (312)587-8702; Email: tbaas@nwpipe.com 2 Engineering Manager, Northwest Pipe Company, 183 Northwest Drive, Washington, WV 26181; Tel: (304)863-3316 ext. 4904; Email: jgardner@nwpipe.com 3 Director of Engineering, Northwest Pipe Company, 5721 SE Columbia Way, Suite 200, Vancouver, WA 98661, Tel: (360) 397-6250, E-mail: rmielke@nwpipe.com 644 Pipelines 2011: A Sound Conduit for Sharing Solutions © ASCE 2011
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Published on 01/01/2011
Volume 2011, 2011
DOI: 10.1061/41187(420)60
Licence: CC BY-NC-SA license
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