New Technologies
Plastic Pipes Conference Association # 2004 Milan
Woods, Marti, Ferry
Open-cut installation of C900/C905 PVC for new potable water systems has been a proven methodology for many years. Creating PVC pipe with improved hydrostatic stress rating through expansion and orientation of the polymer (PVCO) is likewise established technology. Sliplining existing pipelines with butt-fused sections of polyethylene pipe is also a familiar technology. Advantages of each of these technologies are captured in a new rehabilitation system : PVC pipe which is butt fused, inserted into a pipeline, and then expanded and oriented in place. The resulting product is a structural, NSF-61 certified, pressure capable renewed water line accomplished with a trenchless approach. Development of this product and system required three technical accomplishments : producing consistent, high-strength fusion joints; expanding the inserted fused sections to the inside diameter of the host pipe; and quantifying the strength increase obtained to rationally assign a pressure rating to the expanded-and-oriented pipe. Data supporting these developments is presented.
Related papers
Author(s) : T. R. Marti
Horizontal Directional Drilling, or HDD, is now a common technique for installation of PVC pipe. This was not always the case. The fused PVC use in HDD has grown from an initial installation of 500’ (150M) in 2004 to installation lengths over 7000’ (2.14 KM) today. Advancements in connection properties taking into...
Author(s) : Sunwoong Choi, Tom Marti
Small scale, steady state (S4) testing per ISO 13477 is a lab-based procedure to determine the critical pressure at which a fracture will propagate following initiation in a given pipe material filled with a given test medium. The S4 test was originally developed for the natural gas industry using air as the test...
Author(s) : Tom Marti, Richard (Bo) Botteicher
In North America, trenchless pipe installation methods continue to see rapid adoption in municipal markets with well over 70 percent of utilities having used some form of trenchless methods in the recent past according to a 2012 survey. This adoption rate is a function of improving equipment, installation experience,...
Author(s) : D.Woods
Various methods have been proposed and used to estimate the service life of Polyethylene (PE) piping in natural gas distribution. These include the Rate Process Method (RPM), various bi-directional shift functions, including the Popelar Shift Functions (PSF), and the shift functions of Brown and Lu. More recently,...
Members of the Association
