d’ROP is our custom-built, remotely operated survey platform launched in 2015, designed specifically for survey operations from the coastal margin, up to 120m of water depth.
d’ROP is a dynamic Remotely Operated Survey Platform that borrows and combines technology and operating principles from existing ROVs, ROTVs and systems from the modern day dredging industry. Addressing many of the inherent limitations of compact free-flying ROVs and seabed crawler systems, the d’ROP is ideally suited to precision tracking operations in dynamic coastal environments.
- Economic acquisition platform.
- Low risk ‘’hands-off’’ launch and recovery.
- Proven capability in complex tidal conditions
- High payload
d'ROP is proven in challenging marine environments
d’ROP excels in providing precise depth of burial data in those areas where compact ROVs typically struggle with environmental conditions, and work-class ROVs add significant extra expense. When mobilised to Bibby Athena, the system can effectively track cables and pipelines from the very coastal margin to the offshore substation or platform, and offers the ideal solution for interconnector cable tracking.
Using proven technology and off-the-shelf components the d’ROP can accommodate multiple sensors, including the Pangeo Sub Bottom Imager (SBI), Teledyne TSS350, high resolution multibeam and a spread of inspection cameras. Subsea positioning is provided by a high specification USBL system, with standard ROV tooling such as a sophisticated onboard motion sensor and obstacle avoidance sonar.
“It was very pleasing to see the Bibby Athena carrying out her depth of burial operations so safely, efficiently and to good effect over the Burbo Bank Extension Export Cable. The development of the use of the dynamic Remotely Operated Survey Platform (d’ROP) with the PanGeo Sub Bottom Imager over the last 2 years has led to a very competent operation and I was pleased to see it utilised effectively for the first time on this project. It was of great benefit to the project to have Bibby HydroMap be able to present the findings in person to the us at our offices shortly after demobilisation, and even during operations for specific interrogative tasks, for which the Bibby HydroMap team were very flexible. I look forward to using the setup again on more planned cable depth of burial works.”
Gareth Ellis, Burbo Bank Extension Export Cable Survey Project Manager
d'ROP offers exceptional station-keeping
Built from industry standard components, the d’ROP is deployed vertically through a custom-built LARS through the vessel’s moon pool. It derives primary horizontal positioning from the vessels dynamic positioning (DP1) system, making fine adjustments and maintaining stability using its four thrusters.
Vertical position is tightly controlled, using advanced heave compensation built into the LARS, monitored by the onboard INS and tracked from the vessel, using a high specification USBL. Since much of the operation is semi-automated, this reduces personnel interaction, further helping to reduce acquisition cost.
Providing significantly more thrust than an equivalent-sized ROV, the d’ROP's ability to hold station allows it to remain stationary, operate at slow speed for depth of burial surveying, or track at up to 4 knots for acoustic survey.
This combination of self-adjusting feedback between the systems provides an incredibly stable platform, ensuring accurate line keeping and efficiency on site. The unit has been proven to work in challenging environmental conditions, including large bed forms and strong tides of up to 3 knots. The survey sensors equipped provide the primary limiting factor, in terms of acquisition speed, with the heave compensation system forming the secondary limiting factor, whilst on site.
Maintaining a fixed heading and altitude in relation to a survey line, cable or pipeline, this provides exceptional line-keeping ability in comparison to traditional mid-size ROV systems without additional power requirements. Providing significantly more thrust than an equivalent-sized ROV, the d’ROP’s ability to hold station allows it to remain stationary, operate at slow speed for depth of burial surveying, or track at up to 3 knots for acoustic survey.
Spec Sheet: d'ROP