Dynamic Behaviour of Inverted Catenary Cold Water Pipelines for Seawater Desalination Project
Unburied flexible pipelines are deployed for conveying the cold water for desalination process in coral island. Generally, high-density polyethylene material is used as cold water pipeline, where the pipelines could not be buried in coral seabed considering its buoyancy in seawater and simplistic in deployment configuration. However, such pipelines are subjected to oscillations, due to current in a shallow water region. Hence, it becomes essential to study about the dynamic behaviour of such flexible pipeline. Numerical analysis has been carried out using ORCAFLEX and Shear7 software to ascertain the vortex-induced oscillations and front-end tension. Experimental studies have been carried out in 2 m current flume at Department of Ocean Engineering, IIT Madras. The magnitude, period of oscillations and front-end tension are recorded and processed. Numerical analysis has been carried out and compared with experimental results. Field studies have been carried out in the coastal area of the coral island to ascertain the magnitude and direction of the current during March 2017. The observed data are used in the numerical analysis to confirm the results.
KeywordsPipeline Vortex-Induced oscillation Current Drag Deep water
The constant support of Director, National Institute of Ocean Technology to carry out this study is gratefully acknowledged. The funding provided by Ministry of Earth Sciences, Government of India to carry out the field studies and experimental studies is hereby acknowledged.
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