Pollution Engineering - February 2009 - (Page 39)

about 1.5 miles from the site where 2,000 linear feet of 110-inch diameter sliplining pipe could be stored. “We opted to get the first run of pipe on the ground before we started,” said Gillis. Shaft eliminated “Initially we thought we would need three installation shafts, but we were able to do this with just two shafts because the pushing went so easily,” said Callahan. “Access to the sewer was limited because of the 5 to 26-foot cover depth under the existing infrastructure, including roads and a railway.” The installation lines were quite long for pipe of such a large diameter. To decrease the friction, it had to be kept as neutrally buoyant as possible. Said Gillis, “The only issue with installing was to control the water to the level that would make the pipe neutrally buoyant. Once we figured that out, we had no problem. Typically, we had 15 to 18 inches of flow, and we calculated that including the weight of the pipe, its contents and everything else, we needed 27 inches of water outside the sliplining pipe to make it neutrally buoyant. We made some modifications and the pipe stayed buoyant." The construction company worked to find the best option for the grouting, which included several grout lifts in stages to prevent uplift. “The grouting wasn’t as simple as it would be on smaller diameter projects since surface access was limited. Because this is an interceptor that is sensitive to rain, if you’re got a 6- or 7-foot bulkhead in the sewer and rain comes, that sewer is ineffective,” said Gillis. Although the grouting took some critical thinking, the pipe has high stiffness and has been performing well. “We are continuing to grout and are looking at being done with everything by the end of July,” stated Callahan. PE Erin Boudreaux is the marketing assistant for Hobas Pipe USA. For more information, please contact the company at (800) 856-7473, 281-8212200 or e-mail at info@hobaspipe.com. Facts are also available at www.hobaspipe.com. Visit www.pollutionengineering.com to electronically forward a copy of this article to a colleague or customer. Contact us today for dependable level measurement in highly viscous wastewater environments, customized for your application and delivered in as little as 2 days. • Custom level ranges from 6 to 115 feet H2O • Custom cable lengths • Optional lifetime lightning protection • IS approved for hostile environments • Teflon® sensing diaphragms to prevent buildup • Size alternatives for any installation Order online at: www.PressureSystems.com (800) 328-3665 sales@PressureSystems.com FEBRUARY2009 www.pollutionengineering.com 39 http://www.hobaspipe.com http://www.pollutionengineering.com http://www.pollutionengineering.com

Table of Contents Feed for the Digital Edition of Pollution Engineering - February 2009

Pollution Engineering - February 2009 Contents The Guest Dialog EnviroNews PE Events Legal Lookout Casebook Canada Environmental Management When Cleanup is Rocket Science RemTEC Features A Chile Air Filter Safer Waste Handling Reaps Rewards 2009 Environmental Software Review Some Serious Sliplining Environmental Software Products Biosolids Equipment Classified Marketplace Advertisers Index State Rules

Pollution Engineering - February 2009

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