The Deep C Solution

Deep C delivered a compact subsea dredging and cutting spread designed to perform under cold, brackish water conditions and within strict deck space limitations. The dredging system enabled efficient clearance of multiple locations along a 3.3 km stretch of pipeline without interfering with parallel deck operations.

To secure precise cuts on the 20” concrete-coated pipeline, Deep C deployed diamond wire saw technology that had been pre-tested on identical pipe geometry to guarantee offshore reliability. With ROV-assisted alignment and contingency tooling in place, the operation was executed with accuracy and control.

When extreme cold briefly affected the dredge pump during startup, Deep C’s crew implemented a rapid winterization measure, restoring full functionality in less than an hour and ensuring the schedule remained intact.

Key Data Points

Results

The subsea operation was completed in approximately 12 hours at ~70 m water depth. All cuts were delivered according to specification, with pipeline ends successfully repositioned and prepared for the new spool. Despite the freezing incident, no time was lost on the overall schedule.

Key success factors included compact dredging systems that minimized deck footprint and the precision of the diamond wire saw, which had been validated prior to deployment.

The client expressed satisfaction with the safe and efficient execution, and the lessons learned have already informed Deep C’s procedures for winterization in brackish water.

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