Real-time monitoring assists platform installation offshore Alaska

Offshore staff

HOUSTON – UTEC Survey has provided positioning services to assist installation of a monopod liquid natural gas platform and a 30-km (19-mi), 10-in. LNG pipeline in Alaska’s Cook Inlet.

The company mobilized 24 field personnel for the project, working with Coda Octopus Echoscope technology to provide positioning and survey services for five vessels

This was the first monopod installation in the Cook Inlet for 25 years and the first time that four Echoscope systems operated simultaneously.

UTEC says the aim was to use the Echoscope sonars for final verification of the deployment position. However, due to a combination of poor visibility caused by tidal changes, 6-7 knot currents and heavy silt – instead, the contractor opted instead to deploy multiple Echoscopes combined with measurements to complete the installation. 

The Echoscope provides a real-time 3D detailed, geo-referenced image of moving and static subsea hardware and features, even in poor visibility conditions.

Three systems were installed on the pipelay barge (one on the bow, one on the aft, and one on the end of the stinger), facilitating monitoring of the touchdown and pipe position in the stinger and identification of potential hazards on the route.  

Using four Echoscopes simultaneously allowed the monopod to be seen as it was lowered into position on a kingpile. UTEC and the client were thereby able to see operations in real-time, rotate the viewing perspective and to take measurements.

Combining the measurements and on-screen images resulted in increased efficiency and accurate positioning of pipelines, mattresses and the monopod, UTEC added.

09/29/2015

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