A new acoustic positioning technique to improve the quality and accuracy of pipeline touchdown monitoring has been successfully utilised by leading project management, engineering and construction company Technip. The company has installed a Sonardyne GyroUSBL transceiver on the stinger of its rigid pipe S-lay and heavy-lift construction vessel, G1200. Used in conjunction with Sonardyne's Ranger 2 USBL tracking system, the technology is used to acoustically track a remotely operated vehicle (ROV) positioned at pipelay touchdown to ensure the pipe is being accurately laid in the permitted corridor. Ranger 2 is a survey grade USBL acoustic positioning system designed for long-range tracking of underwater targets and position referencing for dynamically positioned (DP) vessels. The system calculates the position of a subsea target by measuring the range and bearing from a vessel-mounted transceiver to an acoustic transponder fitted to the target.
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