James Fisher Subsea Excavation (JFSE) has completed a challenging project for underwater services company Seatek in the Kandla Gujarat region, India.
JFSE deployed the shallow water Twin R2000 tool for post-lay trenching and backfilling of an HDPE pipeline with concrete sinker blocks over a distance of 7.5 km. The pipeline was trenched to 1.5 m top of pipe in an intertidal zone with 7 m tidal variation over a distance of 7.5 km.
The challenge of keeping stress levels to a minimum on the plastic pipeline while slowly lowering the concrete sinker blocks in an area where there was often no water meant that the stability and shallow water capabilities of the Twin R2000 were advantageous.
Further issues included the geophysical properties of the soil, the long intertidal zone and the blocks being asymmetrical to allow for long-term burial.
JFSE’s operations team had successfully completed four similar projects before travelling to Kandla Gujarat and have another two scheduled in the coming months.
Delzad Karani, Director at Seatek, said: “This was a very challenging element of our overall project and it was essential we found a solution. The JFSE team delivered a great service from beginning to end. Their understanding of complex excavation requirements and ability to improvise to suit the site conditions was imperative to the success of our post-lay trenching and backfilling requirements.”
JFSE operates a fleet of 30 M/CFE tools worldwide, with equipment stationed on five continents. Its team is responsible for the successful completion of more than 450 projects, providing clients with a reliable, innovative and world-leading service.
Kenneth R. Mackie, Managing Director at JFSE, said: “There are no two subsea excavation projects exactly the same but having a team in place which has worked on hundreds of excavations over two decades means we have a wealth of experience to draw upon and the innovative attitude to apply the lessons we have learned to new challenges.”
“This had proved a particularly tricky element of the project and other attempted methods proved unsuitable. Our shallow water capabilities and personnel, who had experience in operating under similar conditions, provided the client with a time and cost-effective solution to overcome the very particular demands of this excavation.”
Read the article online at: https://www.worldpipelines.com/business-news/26052017/jfse-completes-kandla-gujarat-project/