Spool and Hub Metrologies with Dynamic Laser Scanning
DOF SUBSEA
OVerview
Spool and Hub Metrologies with Dynamic Laser Scanning
Customer: DOF Subsea
Industry: Offshore Energy
Vehicle Used: Triton XL ROV
Voyis Products Used: Insight Pro
Summary: In December 2016 at The Underwater Centre in Fort William, Scotland, DOF Subsea (DOF) arranged a demonstration of dynamic underwater laser scanning as a replacement for traditional metrology techniques. The demo showcased Voyis’ underwater laser scanner, the Insight Pro, and Sonardyne’s inertial navigation sensor, SPRINT; Syrinx DVL and 6G acoustics. Seatronics, channel partner for Voyis and provider of Sonardyne rental equipment, provided sensors and project/technician support.
The Project
Traditional metrology campaigns using Long BaseLine (LBL) acoustics and photogrammetry demand significant vessel and ROV time. LBL requires physical interaction with the subsea assets and photogrammetry is unable to provide real-time results. The goal of the demo was to quantify the operational time reduction and accuracy of dynamic laser scanning for subsea metrology.
[Dynamic Laser Scanning] has revolutionized the capability to perform mobile metrology operations in a timescale previously unattainable.
The Process
Two structures each containing four flanges were placed on the seafloor with an approximate baseline distance of 18m
The control measurement for the analysis was established by a LBL acoustic technique with flange orientations provided by installed gyro frames
The Insight Pro was mounted at 30° to capture the side facing hubs, upward facing hubs, and seabed in a single scan pass over the 18m baseline
With each scan run taking only 4 minutes, the ROV performed multiple redundant runs from structure-to-structure at an altitude of approximately 3m
The data was transmitted to the surface in real-time, processed through EIVA navigational software, and then through DOF’s Metro Prep software for automated metrology analysis
From these high-resolution point clouds, exact measurements can be taken to facilitate the fabrication of spools and jumpers while concurrently providing as-built condition assessments
Final Results
Four runs were performed at 4 minutes a run. The measurements of the vertical jumper metrology and the horizontal spool metrology were within accepted industry tolerances.
The results of the trial highlighted the following key benefits of Dynamic Laser Scanning for metrology applications:
Reduced Survey Time
Significant reduction in the time to gather the data when compared to other techniques.
Real-time data
Delivery of final metrology measurements offshore within hours of data acquisition.
Contactless
No physical interaction with assets is required.
Flexible deployment
Configurable mounting orientations on ROVs for specific survey applications
More than metrology
The 3D model used for metrology serves as an As-Built model of the subsea installation and the surrounding area to provide a baseline for future intervention work.
Hours or less time-to-measurements
Minutes or less to collect data
Spool and Hub Metrologies with Dynamic Laser Scanning
Results
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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