Brownfield Project Execution

Samphire Subsea Case Study

The Production line system between two manifolds was found to have significant pitting corrosion following an inspection campaign. An inter-manifold gas lift flexible had also recently failed, leaving production shut in awaiting replacement. Both required to be replaced to ensure the service could be supported till end of field life.


Samphire was engaged to manage the engineering and execution of the replacement flowlines. The workscope required pre-cutting of the trench for the lay route, laying of the replacement flowlines and subsequent backfilling of the flowlines. Spot rock dumping was also completed to cater for upheaval buckling on the review of the survey data post installation.

The work involved bid process development, technical and commercial evaluations of the bids, prior to final selection.

Samphire worked with the chosen subsea contractor, to optimise the vessel solution such that both products could be installed in a single trip. This delivered savings across transits and mobilisation costs and provided an overall safer operation for the Client.


Samphire was also engaged to support the engineering and execution of the 2nd phase of the scope which involved the disconnection of the existing infrastructure and the tie in and testing of the new flowlines during a planned outage.

Work Screening / Evaluation Equipment Criticality Review Risk Management Caisson Investigation Study/Repairs Subsea IRM - General Subsea Support Brownfield Project Execution Work Execution Pigging Campaign Management Subsea Engineering - Single Vessel Solution Subsea Controls Obsolescence Package Management Subsea Facilities Life Extension Subsea Decommissioning Services