Steel tunnel liners provide a lifetime solution to problems associated with water transmission tunnels. Steel liners can restore usage, stop water loss due to leakage, prevent erosion, and reduce friction to improve water flow. Other benefits include the ability to attach appurtenances and fittings that are used to direct and control the water flow.
While the benefits of steel tunnel liners are many, the difficulties associated with their installation can often provide a daunting challenge. It is not uncommon for a project to include a liner installation in rock or concrete tunnels that were never intended to be accessed again. National Welding has safely installed liners in tunnels of all shapes and sizes with annular spaces down to nearly nonexistent. If your project could benefit from a steel tunnel liner, give National a call for assistance in any phase of the project, from design, to bid, and installation. See the link below for some steel tunnel liner projects that National has completed.
42″ Finished Water Transmission Main
Fitting and Welding steel pipe water transmission line 42″ x 19,000′. Approx 488 joints, plus Butt Straps.
Owner: Kansas Water District #1
Date: August 2008 to January 2010
Olmsted Flowline Replacement Project
Fit and Weld 1200’ of 114″ diameter x .5” thick bell and spigot steel pipe. Install, fit, and weld 300’ of 114” butt welded steel pipe in tunnel.
Owner: Central Utah Water Conservancy Dist.
Location: Provo, UT
Date: October 2017 to December 2017
Demolition Projects, Pipelines Cross Country, Tunnel & Shaft Liners
Pine Creek Dam Safety Project
Install, Fit and Weld 144″ Diameter x .750″ x 500′ Penstock within 156″ Existing Tunnel under a dam. Includes design/use of pipe carrier.
Owner: US Army Corps of Engineers
Location: McCurtain County, OK
Date: April 2016 to January 2018
Staten Island Siphon Replacement
Install, Fit and Weld 72″ Diameter x 10,000′ Tunnel Liner under New York Harbor Includes design/use of pipe carrier.
Owner: NYC Economic Development Corp.
Location: Staten Island, NY
Date: July 2015 to January 2016