Construction of the pipe bedding consisted of a 2-foot thick layer of sand covered by 1-foot layer of 1.5 rock for a total minimum width of 42 feet. Image shows the pipe bedding screed on the ocean floor with materials delivered through the treme pipe from the barge above
Profiling sonar scan. A profiling sonar mounted on each end of the bedding screed was used to verify the thickness, width and levelness of the bedding. A digital inclinometer was used to keep the slope of the bedding to the required specification.
Pipe laying operation. Image shows the pipe laying barge with pipe horse laying two sections of pipe weighing 140-ton per cycle on the previously installed bedding. The pipe laying horse was also fitted with profiling sonars, digital inclinometer's and acoustic positioning transponders