Offshore Maintenance and Construction
Repair, preventative maintenance, structural modification and construction of offshore facilities
Offshore of ExxonMobil’s Qua Iboe Terminal in Nigeria there are in excess of 50 platforms ranging from a central complex to gathering stations and satellite platforms. Seaweld Engineering was responsible for the day to day maintenance and repair of these installations. To effect this work we had a work vessel, the MSV Leinetor, permanently assigned to these duties. Our onboard workforce of 26 carried out the multi-disciplined activities necessary to keep the field running. This team also installed plant, equipment, pipework, structures etc. which had been built at Seaweld Engineering’s fabrication yard in Ibeno, nearby the Qua Iboe Terminal. The welders in this team were coded and frequently carried out modifications to various process pipework systems in the field.
A multi-disciplined team of Seaweld Engineering personnel was permanently based on Mobil’s Oso platform to assist with field development.
Offshore from Calabar, in Rivers State, Nigeria, lies the Addax field, comprising five platforms. Seaweld Engineering operated the PMV Sea Rex together with a multi-disciplined team carrying out construction related maintenance on these platforms. The work included pipework repairs and replacement, structural repairs and instrumentation breakdown maintenance. Seaweld Engineering has developed a computerised Planned Preventative Maintenance system. Work programs are automatically generated from the system covering timing and work scope of a range of equipment, piping and structures.
In Equatorial Guinea, Seaweld Engineering has been working offshore since mid 1999. The company has two contracts with Mobil Equatorial Guinea, Inc., (MEGI) for the supply of skilled labour and a general labour supply and management contract with over 300 nationals employed. Seaweld Engineering supplies the Offshore Base maintenance construction vessel to Marathon Oil Company for the Hook Up of the Alba complex.
The Offshore Base provides accommodation for 165 personnel with workshop facilities, warehousing and office accommodation. The barge also has 15 Tonne and 40 Tonne pedestal cranes suitable for handling fully laden shipping containers.
Under the Labour Contract, Seaweld Engineering has provided up to 90 construction personnel on rotation, who work to the company’s own Safety and Quality procedures. Seaweld Engineering is committed to the training of local personnel and three Seaweld Engineering Equatorial Guinean employees have recently achieved qualification as coded welders, the first in the country.
Production operation of producing platforms
|Supported from the PMV Sea Rex, Seaweld Engineering managed the offshore processes of the Addax field. Seaweld Engineering was responsible for maintaining all production criteria and reporting daily on all fluids produced, including BS&W, API, pressures, temperatures and flows. All process criteria from the wells to the flare are managed. To effect this, we maintained a 24-hour presence on all producing facilities.
A schedule was maintained which progressively identified items of equipment or valves which must be function checked. For example, planned process maintenance ensures that when a valve must open automatically, the actuator works; or that when a fluid level must be maintained in a vessel, the SG calibration for the level controller is still correct. Our production operators and technicians carried out these activities as determined by the schedule.
Seaweld Engineering maintained three SPMs in the Mobil field in Nigeria. A support vessel, the Princess Tide, was used for this purpose. Seaweld Engineering has handled both surface and subsea maintenance of these facilities.
The work comprised ‘pre’ and ‘post’ tanker maintenance, which included the ‘on-boarding’ of the floating hose connections and mooring connections, the inspection of the valves and moving parts subject to wear, together with maintenance of the SPMs bogey wheels and all other moving parts. Electrical and instrumentation equipment was also checked and maintained. Pre and post tanker maintenance is similar in content, the former designed to ensure that the SPM is safe and available for loading and the latter to identify and correct where necessary any damage or excessive wear caused during the loading operation.
Seaweld Engineering personnel boarded the tankers when they arrived to supervise hose connection and disconnection. The SPM team also makes up new hoses when needed and back flush the hoses if a problem is detected with the hose system. We have been carrying out this work for 18 years.
CAD modelling of structures for maintenance records
The Seaweld Engineering Computer Aided Design Department prepares 3D diagrams of jackets and other structures so that joint configurations can be visually recognised and be identified by unique numbers. All subsequent inspection records can be related to this number and if necessary remedial maintenance or repair activities can be tied to it. Similar models are made of SPMs, so that various inspection and maintenance activities can be recorded in a visually ‘user friendly’ manner.
Examples of offshore experience:
Use the links below to view particular examples of our offshore work.
MCV Offshore Base
Offshore Base Machine Shop
Offshore Sample Contracts
ALBA Project, Marathon OC, EG
GUPCO Platform Repairs, Egypt
CHEVRON Flowstation Revamp, Nigeria
MEGI FPSO Life Extension, EG
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