Ted Compton, Jeff Schell
Papers # 2014 Chicago
For decades, energy companies have used thermoplastic liners to protect pipelines from internal corrosion and abrasion. Liner systems can be a simple and cost effective means to extend the life of an asset and protect the environment. Many advances in technology have occurred over the years and thermoplastic liners systems are a mature and widely studied technology. Liner systems evolved from simple polyethylene “slip-lined” systems suitable for relatively low pressures and temperatures to more advanced thermoplastic compression-fit liner systems suitable for higher pressures and temperatures. New thermoplastic offerings and specially blended resins have been used to expand the operating envelope available for liner systems in pipelines, piping, and downhole tubing applications. Installation techniques have improved to offer more robust and more reliable systems. Some improved installation techniques allow for longer insitu-installation lengths while others provide a more robust system with increased liner stability. One aspect of a liner system that is critical is the connection system. Thermoplastic lined pipes are offered in finite sections that can be less than one meter to more than two kilometers in length. The individual lined lengths must be joined together and the selection of the joining method is an important aspect of the overall design and reliability of the system. This paper describes and explores four available connection methods for thermoplastic lined pipelines, while providing some general guidelines for application and selection.