Jointing of Pipes
Plastic Pipes Conference Association # 1998 Gothenburg
Smith, Guzowski
Some forty years ago simple 0 ring joints for PVCu pipes were just being introduced as an alternative to solvent cemented joints. Rubber lip seal type of joints soon followed for both pressure and non pressure applications. Whilst in theory these designs were fine, both styles of joint had operational problems, mostly, but not exclusively, in the pressure pipe market.
The problem for these early joints was in being able to accommodate a wide range of tolerances for pipe spigot and socket, including pipe ovality, as well as those production tolerances of the gasket. Often it was the 'on site' condition that was more important than the 'in factory' dimensions that mattered .Whilst under pressure, in certain circumstances, some of the sockets could grow, distort or deform, leading to possible gasket movement and loss of sealing. Certain companies ensured the stability of their sockets by thickening the wall section or fitting a collar either internally or externally.
During this period of development, the concept of forming sockets on pipe, both in line and off line developed, with collapsible mandrel belling machines evolving particularly in Europe. Over the next ten years automatic belling machines and higher performmce gaskets evolved including the well known Anger B system. These joints and similar ones were a significant improvement and they paid a significant part in establishing PVCu pipe at the forefront of water and sewerage applications enabling PVC pipe to compete with ductile iron pipe with its tried and well proven Tyton rubber gaskets.
Related papers
Author(s) : Ilija Radeljic, Ebbe Smith
HDPE pipe can be relatively easily scratched during the manipulation on the site, which is especially true for the marine pipelines. Installing the scratched marine pipe with the S bend method presents a risk and repair methods are usually performed. Currently, there is no standard defining the repair procedure, in...
Author(s) : Crunkhorn, Whiter, Mulheron, Smith
The water industry has used renovation techniques to extend the life of its assets for a number of years, beginning with sliplining in the 1970s. These techniques have evolved with time and the use of an interactive liner, where the liner withstands only some of the service loads, with the remainder borne by the host...
Author(s) : Crunkhorn, Smith, Whiter, Mulheron
Cast iron pipes have been loaded to failure using a four point bending geometry under displacement-controlled loading. Specimens were tested with various liner configurations : unlined, epoxy resin lined or lined with one of two interactive (semi-structural) liners. Some of the pipes also had a circumferential notch...
Author(s) : Gedde, Smith, Ifwarson, Viebke
Polyolefin pipes subjected to extensive hoop stresses fail in a ductile manner (stage I). At lower stresses failure is brittle and may in certain cases be preceded by degradation of the polymer (stage 111). Reviewed in this paper are the changes in polymer structure and antioxidant concentration profiles preceding the...
Author(s) : Edwards,Ellis, Georghiades,Smith
A model is presented for the prediction of cooling rates and temperature profiles during the cooling and solidification of M.D.P.E. pipes. Experimental measurements from an industrial production line are reported and these confirm the predictions of the model. Finally, the model is used to determine the most important...
Author(s) : Smith
My task in this paper is to convey my experience in the use of uPVC in soil drainage schemes at Port Talbot. I began incorporating plastics drains in building projects in 1966, and owing to experience gained I have continued to specify its use in schemes under my control since that date. One might ask me why I began...
Members of the Association
