CANADA - Monitoring changing
conditions 
- survey of submerged pipelines for movement and coating
damage ...
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A pipeline
in northern Canada was laid across a fast flowing river - over 1
mile (1600 metres) wide, with a max. depth of 50 ft (15 metres).
There had been indications of severe bottom scouring and the
owners were worried about movement of the pipeline and possible
coating damage.
The C-Scan survey was carried out in February, when the river was
covered by ice and temperatures were down to -40oC. Readings were
taken at 100 metre intervals and stakes driven into the ice at the
precise ‘overhead’ positions. These were then tied in to existing
survey markers on the bank and thus the amount of downstream ‘
bow’ determined. Depth readings were also recorded and found to be
accurate to better than 5% at 10 metres. The line coating was
found to be undamaged.
A total of 4 miles (6,500 metres) of submerged line was surveyed
in extreme conditions in under 7 days.
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