Post-lay Survey

 

After the installation of pipeline, post-lay survey operation plays a vital route in determining the free span locations. Spans should be corrected by placing grout bags beneath the pipeline and filling them using ordinary Portland liquid cement or grout.
The below figures demonstrate some detected free spans using two technologies, side scan sonar and multibeam echosounder, while these two types of data are integrated:

 

Free Span Detection by MBES and SSS

 

   

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