Plastic Pipes Conference Association # 2021 Amsterdam
Peter Hubbard, Linqing Luo, Andrew Yeskoo, Kenichi Soga, Krista (Moita) Araica, Gus Cicala, Marshall McLeod
Seismically active faults pose a risk to buried water pipelines that can be complicated to quantify. Fault type, slip rate, pipeline geometry, and soil conditions all factor into a complex soil-pipeline interaction. For critical pipelines that cross faults, high-density polyethylene (HDPE) has become an attractive material choice because of its accommodation of large deformations. Using HDPE increases the robustness of these pipelines, but it does not inform a utility about the actual deformed condition of a pipeline. This may be viewed as simply pushing a large break into the future when fault displacements are sufficient to rupture the pipe. By adding a distributed monitoring system to HDPE pipelines, the solution both increases the robustness of the water system and provides an information source that can be leveraged to make asset management decisions in the future, such as intervening measures to reduce stress buildup in a pipeline that has heavily deformed due to fault slippage. In this work, a distributed monitoring system has been designed to monitor two HDPE water pipelines that cross a strike-slip fault in California, USA. The system is based on fiberoptic distributed strain sensing (DSS). The design process of the monitoring system is presented, as well as laboratory tests and lesson learned.
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