Subsea Inspection, Maintenance & Repair
Diving based inspection, preventative maintenance and repair of
production platforms, loading buoys, risers, flowlines and associated equipment.
Seaweld Engineering has been supplying a diving service for over 20 years. Diving activities can be broadly split into three sections; inspection and repair, pipeline survey, and maintenance.
Inspection and repair of sub-sea structures is a multi-disciplined activity. For example, in the case of jacket inspection, prior to commencing the task a model of the jacket is prepared using CAD techniques. From this model each separate structural member is identified with a unique reference. A schedule of these members is drawn up and a diving plan is prepared. This plan has to take into account ‘bottom time’ available at various depths involved. When the inspection has been completed, relevant data is collated and remedial works identified. A new diving plan is then prepared and resources and materials gathered so that the work can be carried out. Where necessary the members are cleaned either by water jet or manually. A visual inspection is done followed by NDT if found necessary. Historically, Seaweld Engineering has found damage severe enough to warrant a formal structural analysis, and subsequent engineering of the repair method. In these cases the repairs have been effected using underwater welding techniques (Wet Welding). Mechanical clamping techniques have also been used. Detailed reports are prepared and become part of the structure certification package.
Pipeline survey is a regular event usually determined by a preventative maintenance plan. The survey will include span identification and measurement, anode condition and weight coat condition. As in the case of jacket inspection, a plan is drawn up for the survey based on a model of the pipeline which refers to pipeline joint numbers. When the pipeline is ‘swum’ defects are noted using the ‘joint numbers’ to identify locations. If significant spans are found it may prove necessary to ‘sand bag’ them or if large areas of weight coat have been damaged, other pipeline stabilisation techniques may be called for. When all remedial works are complete, the final report forms part of the pipeline certification.
Oceanteam 2000 Limited Dive Services
Subsea Sample Contracts
MPN Coded Wet
Welded Repairs, Nigeria
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