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Faculty of Engineering, Built Environment and Information Technology
School of Engineering
Department of Civil and Biosystems Engineering
Selected Highlights from Research Findings
The research investigated alternative end sections for grouted viscous-elastic type linings to be used in steel pipelines; the integrity of the mechanical bond between different external profiles of the lining and the surrounding cement mortar grout; Determined the integrity of the lining under varying internal pressures (both positive and negative pressures); determined the integrity of the lining during installation and grouting and under external loading conditions on the pipeline; developed design relationships that reflect the structural contribution of the different layers in a composite pipe and the effect of shape imperfections; and developed installation criteria for grouted viscous-elastic linings in steel pipelines. A major concern was to establish a system for the field jointing. Figure 1 reflects the method that has been developed for this system. In simple terms the system will work as follows:
The liner (2) will be pulled into the pipeline (1);
A clamping system will be slid over the pipeline and will be used to form the pipeline;
A pre-manufactured flange system (3) with a grout hole (7) will be slid over the pipeline;
The uPVC flange (5) will then be welded onto the liner (4) that protrudes from the steel pipe (simplifying the welding process);
The steel flange is then slid back onto the uPVC flange; and While the inside is sprayed with water to cool down the liner the steel flange is welded onto the pipeline.
This system has been tested up to 21 Bar for water tightness of the flange configuration and the results reflect that the system is operating as expected.
Contact person: Prof SJ van Vuuren.
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