Dexon TechnologyDexon Technology recently inspected two 12-in. subsea pipelines connecting an onshore pumping station to a marine berth.
These lines carry jet fuel and LPG to tankers on tight international schedules—where every second of downtime means big losses.
To minimize costs and disruptions, Dexon proposed a bidirectional inspection—a time-saving move that required custom engineering to pull off.
Challenge #1: Bidirectional Tooling
Most ultrasonic tools are built for one-way travel, and bidirectional runs can introduce navigation risks as it makes its return journey.
Dexon’s compact UT-MC Falcon was specially modified for the task:
• Joint-free construction to avoid snagging on its return
• Condensed electronic loadout for a more compact body
• Precise data-capture (±0.3 mm for metal loss)
Challenge #2: Multi-schdule pipeline
To add to the challenge, these pipelines included multiple schedules, or wall thicknesses, in a single line.
Our engineers designed & installed high-density transducers, allowing the tool to maintain consistent, reliable performance across different thicknesses and at transition points.
Additionally, inspectors thoroughly calibrated the tool prior to the run, adjusting for the unique sound profile of each pipeline schedule. Our software team also adapted Dexon’s native analytical software to accommodate the change in data at different sections.
Challenge #3: No Receiver on the Berth
Installing a receiver on the berth would have required complex logistics and extended downtime.
Instead, Dexon engineered a custom onshore launcher, based on the client’s pipeline drawings, and used a berth-side pump to push the tool back.
Inspectors used a combination of total liquid volume and an electronic tracker to monitor the location of the tool and slow it down prior to reaching the end of the line.
The Outcome
Following cleaning and gauging, the inspection wrapped up rapidly—with all two runs being first-run successes.
The client ran all inspections in-product & without installing a receiver berth-side, significantly reducing downtime and costs while delivering full data coverage.
This project shows how innovative designs and a seasoned crew can deliver streamlined, high-resolution inspections—whatever the set-up.