Dexon delivers customised solution for subsea pipeline
25/11/2024
Dexon Technology has successfully executed a custom solution for a pair of challenging 12" subsea pipelines.
These lines connect an onshore pumping station to a sea berth, providing tankers with jet fuel and diesel for international transport. With tight shipping schedules and high downtime costs, executing a rapid inspection without sacrificing top-tier quality was crucial for the client.
To minimise downtime and reduce costs, Dexon proposed a bidirectional run for the inspection. While a bidirectional run offered clear benefits, it presented two challenges: the standard version of Dexon’s Ultrasonic Multi-Channel Ring (UT-MC Ring) needed adjustments to bidirectionally navigate the tight turns; and the pipeline needed a customised launcher and receiver.
The client wanted to avoid placing a receiver at the sea berth, as it would require an additional day of shutdown and a complex installation, so the inspection needed to be bidirectional.
While bidirectional runs are typical in the industry, running this line required adapting the tool to minimise risks. Typically, ultrasonic tools are optimised for one-directional use, with flexible joints to ensure proper centring and navigation through sharp turns; adding a return journey increases the chance of error.
Dexon utilised its compact UT-MC Ring, confident that it would be up for the task. The key features of the UT-MC Ring include: a compact design with condensed electronics, hard drive and transducers; joint-free construction to reduce the risk of the tool getting stuck on sharp turns; and high accuracy in detecting corrosion and metal loss with ±0.3 mm precision and compliance with Pipeline Operators Forum (POF) 2021 standards for inspection and reporting.
Another challenge was the absence of a launcher and receiver. Dexon’s engineering team, experienced in designing custom launchers, stepped in to create a bespoke solution. Using the operator’s plans, they created a specialised launcher onshore.
This tailored set-up enabled Dexon to inspect the pipeline while keeping petroleum flowing and avoiding the need for an expensive receiver at the sea berth. The launcher design was also provided to the operator free of charge.
Despite the challenges posed, Dexon successfully completed the inspection. Following an initial cleaning and assessment, the customised UT-MC Ring finished the inspection in just over two hours. The data was then reviewed by Dexon’s team, which confirmed that it met the company’s high standards.
This project highlights Dexon’s ability to deliver tailored solutions to meet clients’ unique needs. By customising both the inspection tool and providing essential services such as launcher design, Dexon minimised downtime while maintaining high-quality data and pipeline integrity, all while keeping costs under control.
