Modified Slip-lining Processes for Pressure Pipeline Renewal

摘要

The past decade has seen considerable development in the techniques available to utilities for the trenchless rehabilitation and renewal of pipelines. Much of this development has been in direct response to the demand by utilities and operators for cost-effective solutions to the wide range of problems faced with an ageing infrastructure. Increasing awareness of the social cost of pipeline replacement using traditional open-cut methods and ever tighter regulatory requirements has added new impetus to the search for new innovative solutions. This paper reviews two innovative close-fit polyethylene modified slip-lining techniques for gas pipeline rehabilitation applications. The ‘raison d’être’ behind each technique, range of application, underlying design principles, installation process and benefits to operator and contractor alike, are described. The paper concludes by describing recent major projects carried out with each technique for gas applications in North America.