Co-UDlabs_TA_IKT-01-LTF Monitoring water pressure surge effect in rehabilitated waste water pressure pipes
Description
Pressure surges and fluctuations in sewage pressure pipes can be caused by the operation of the pumps. However, the pronounced pressure surges that can frequently occur are an often unrecognised cause of damage. In order to avoid pressure surges, appropriate measures can be included in the planning of pressure sewers (including pressure surge calculations for longer pipelines, design measures such as the arrangement of aeration and deaeration fittings at high points) and their construction. However, in the past, the pressure surge phenomenon was often not adequately addressed. As a result, consequent damage can be observed in older pressure sewer pipes. In the case of trenchless rehabilitation of pressure sewer pipes using relining, the fundamental question is how the host pipe-liner combination behaves under pressure surge loadings and to what extent it can withstand this. This applies at least to the case where a rehabilitated pipeline is expected to still be subjected to a slight pressure surge load despite the retrofitting of aeration and deaeration valves. There are currently no reliable statements on this, because common calculation approaches and currently available publications on scientific investigations are aimed at the host pipe and the situation of an undamaged sewage pressure pipe, but not at a rehabilitated pipe. This project therefore investigated for the first time the extent to which pressure surge loads can have an influence on a pipeline rehabilitated using a liner. Therefore, an experimental setup was used in the Large Test Facility (LTF) of IKT - Institute for Underground Infrastructure consisting of a wastewater pressure circuit system. A defined section with a length of app. 8 meters was rehabilitated with a so called close-fit-liner (polyethylene of high density), the system was subjected to a range pressure surge loads that can occur in wastewater pressure pipes. After the trials the results were compared to those of a common simulation programme. This transnational project is part of the EU funded project Co-UDLABS - Collaborative Urban Drainage research lab communities and was initiated by the Belgian umbrella organization of wastewater companies VLARIO in cooperation with the Flemish water company Aquafin and the University KU Leuven. The authors acknowledge financial support from the European Union under the Horizon 2020 program within a contract for Integrating Activities for Starting Communities (Ref. 101008626)
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http://data.europa.eu/88u/dataset/oai-zenodo-org-15262112 |
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http://data.europa.eu/88u/dataset/oai-zenodo-org-15262112 |