AUV-Based Pipeline Surveying
AUV-Based Pipeline Surveying
Industry: Offshore Energy
Vehicle Used: Kongsberg Hugin AUV
Voyis Products Used: Insight Pro
Summary: Oceaneering and Voyis, through this project, were able to deploy a proven AUV-based pipeline surveying/laser mapping solution using Voyis’ Insight Pro dynamic laser scanner to improve inspection quality while reducing survey time & costs.
In 2014, the team at Oceaneering, known for their innovative approach to surveying, was faced with a difficult task: to develop a way to reduce pipeline survey costs while maintaining the quality of the data captured. The team emerged with a simple yet revolutionary plan to perform these surveys using Autonomous Underwater Vehicles (AUVs). With the ability to travel 6 times faster and to host a multitude of sensors, AUVs provided a dynamic platform from which pipeline surveys could be completed in a fraction of the time compared to conventional methods. However, faster vehicle speeds demanded sensors with higher capture rates to ensure high-quality data and resolution.
Oceaneering approached Voyis in an effort to solve their latest challenge. Through substantial levels of collaboration and teamwork, Voyis and Oceaneering were able to develop an optimal solution for sub-centimetric pipeline inspections.
On average, Hugins travel at 3 to 3.5 knots and 3 to 10m altitude for their pipeline surveys. A typical survey included up to three passes: one capturing data along the central line of the pipe, with two subsequent passes running along each side capturing data about the profile of the pipeline as well as any free spans.
[Voyis] was able to deliver a best-in-class solution not only because of the quality of their scanners, but also as a result of their ability and willingness to collaborate from an engineering perspective.
The 4000m depth rated Voyis Insight Pro was delivered to Oceaneering
The Insight Pro required an initial vehicle calibration at the Oceaneering facility, after which further calibrations weren't needed
Data was extracted off the AUV after vehicle recovery and processed with the Nav data to create a seamless mosaic of the survey areas, which was then integrated into a GIS mapping package
Between 2014 and 2018 Oceaneering completed over 10,000 km of laser micro-bathymetric mapping with sub-centimetric resolution using Voyis’ Insight Pro. The accepted accuracy was consistently met and in most cases survey lines exceeded the target accuracy.
The Voyis Insight Pro high sample rates allowed the vehicle to travel faster to get more coverage out of each dive while providing the highest density of laser point cloud data available on the market. They were able to achieve detailed laser bathymetry at 6+ knots vehicle speed.
of mapping completed
Laser Lines Per Second
AUV-BASED PIPELINE SURVEYING
WARNING - LASER RADIATION - AVOID EXPOSURE TO BEAM
Class 3B Laser Product
448nm, <75mW, 1mSec to CW
EN/IEC 60825-1 2014
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