Full-scale validation test of a pressure pipeline rehabilitated with CIPP
Proceedings Publication Date
Ferran Gras
Ferran Gras, Marco Antonio Pérez, Antoni Andreu Torras
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In the last decades, the Cured-in-Place Pipe (CIPP) technique has undergone a breakthrough in its development and application to rehabilitate pipelines. CIPP liners are a composite consisting mainly of resin and reinforcing fiber. There are regulations for designing the liners based on theoretical approaches and contributions of data obtained from laboratory tests. However, after the experience of its implementation, problems continue to arise in the rehabilitation of drinking water pipes. The tests carried out reveal that a thorough investigation is still needed to establish a relationship between the tests carried out in the laboratory and the actual behavior of the rehabilitated pipe.

This paper presents the results of a full-scale experimental test. The mechanical behavior of a CIPP liner before and after field installation has been studied. In particular, the behavior of each liner's constituent materials, the assembly before and after resin curing, and the liner installed in a full-scale pipeline have been investigated. The installed liner was a structural type. It was mainly made of glass fiber layers and styrene-free and ultra-low VOC Vinyl ester resin. The liner was installed in a DN400 buried out of service concrete pipe. Holes were drilled in the host pipe to impair its performance. The results obtained allow relevant conclusions to be drawn after correlation with laboratory sample tests. These results contribute to developing new dimensions and quality control strategies before and during installation.

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