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Title: Development Of A Live Internal Cast Iron Bell Joint Sealing System - Innerseal
Author: Anthony Winiewicz, Dennis Jarnecke
Source: American Gas Association 2002
Year Published: 2002
Abstract: A method for live, insitu sealing of large diameter, 16-24, cast iron bell joints has been developed by innerseal. The process involves live entry into a low pressure distribution system, location of the joints, preparation, and sealing. Remote controlled robots with closed caption television cameras perform the work required to prepare the pipe and apply the seal. Such a system represents significant advantages over traditional external sealing methods in that the major cost, the cost of the excavation, can be minimized by access to multiple joints from a single excavation. Additionally, leaks in difficult locations such as railroad crossings, busy intersections, highway crossings, etc. can potentially be accessed from outside the problem zone minimizing cost and public impact.

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