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Title: Do not disturb the animals! or, how Con Edison saved $300,000 using a trenchless technology to renew 3,000 feet of leaking gas main at the Bronx Zoo

Every leaking gas main presents a challenge. But when that leaking main follows a series of sweeping bends on its route through North America`s largest urban wildlife park, it presents a special challenge. That was the situation Consolidated Edison Company of New York Inc. recently faced when numerous leaks were discovered along 3,000 feet of a 95-year-old, 12-inch cast-iron main that winds through New York City`s Bronx Zoo. Con Edison knew it needed a long-term solution to this increasingly common problem. Thanks to the cooperative efforts of the utility`s operations and research departments and the Gas Research Institute (GRI), Con Edison also knew about a trenchless technology that could renew the pipe with minimal impact to the environment--while saving the utility a substantial sum of money in the process. In the Paltem system, a woven polyester hose is injected with an epoxy resin and then inverted (turned inside out) into a pipe at an access pit. The liner then bonds to the inside wall of the pipe, forming a smooth, flexible and pressure-resistant lining. The process is environmentally safe, requires very little excavation and can be installed in days, rather than the weeks or months it can take to digmore » up and replace existing pipe.« less
Authors:
Publication Date:
OSTI Identifier:
82948
Resource Type:
Journal Article
Resource Relation:
Journal Name: American Gas; Journal Volume: 77; Journal Issue: 6; Other Information: PBD: Jul 1995
Country of Publication:
United States
Language:
English
Subject:
03 NATURAL GAS; NATURAL GAS DISTRIBUTION SYSTEMS; PIPES; REPAIR; PIPELINES; NEW YORK; EXCAVATION; MITIGATION; LINING PROCESSES; CAST IRON; POLYESTERS; INSTALLATION; LINERS