Repair & maintenance

The successful maintenance of offshore assets requires the correct tooling and expertise to integrate, deploy and operate equipment, and deliver a sound outcome, protecting and maximising asset life.

Our extensive tooling integration capabilities and in-house equipment based solutions can provide many maintenance and repair needs, using both ROV and diver-deployed systems.

Scouring the seabed around structures, through rough sea currents and vortex shedding can cause major issues for subsea foundations. Buried cables can also suffer from under or over-burial due to the changing shape of the seabed. The ability to accurately monitor and measure the extent of seabed disturbance and movement is a key consideration in managing assets.

At Ashtead Technology, we provide monitoring and remediation dredge systems to map the extent of erosion and offer a fleet of dredge pump systems which can be operated by ROV or diver to remediate the seabed around structures and localised cable work.

Acquiring precise dimensions for degradation, damage assessment and subsequent repair operations can be challenging, particularly underwater. Advances in subsea laser-based and photogrammetry technologies are having a significant impact on reducing time and costs.

However, these techniques have to be understood and carefully planned and deployed to extract meaningful data. This requires skilled personnel with sophisticated data processing tools to accurately process and analyse the findings.

As an early adopter of these technologies, Welaptega, an Ashtead Technology company, has an extensive track record for subsea photogrammetry delivery along with Ashtead Technology’s successful and growing track record in deploying precise laser scanning techniques. With our experience and trained personnel we can deliver a quick and reliable measurement service in real-time, ensuring the data gathered is of the highest possible quality.

A common characteristic of offshore energy production and power generation is the multitude of power cables both infield and from field-to-shore. Managing these cables requires periodic verification of the location and burial depth to ensure they are properly protected without overheating due to over-burial.

Ashtead Technology is a leading provider of seabed electromagnetic and sonar-based cable location solutions. By integrating multiple cable location systems with precise inertial position reference systems, we deliver highly precise and rapid inspections and recovery programmes, should repairs or remediation work be required.

Welaptega, an Ashtead Technology company, can assist with the subsea inspection and cleaning of marine power, data, and signal cables. The Riser/Rope Cleaning and Inspection System (RCIS) can be engineered to clean and inspect the surface of subsea tubular components such as flexible risers, marine cables, umbilicals and fibre/wire moorings.

The RCIS frame is towed by a ROV, efficiently cleaning both soft and hard marine growth. An optional module consisting of four cameras performs a full 360-degree close visual inspection of the riser or rope surface.

As assets age and deteriorate over time, it may be necessary to remove their protective coatings to assess their condition from a SA2.5/HB2.5 state, allowing the installation of repair clamps or for other works to be carried out. This requirement is becoming increasingly commonplace as structures around the world begin to reach the end of their working lives.

Thanks to their R&D-driven approach, UCS is experienced in providing high-performance coating solutions and experienced technicians to remove concrete weight coat, bitumen, FBE, epoxy and other coatings without damage to the asset.

UCS carefully applies knowhow and technical performance to ensure that coating removal is effective and asset downtime is minimised.

The removal of natural material and preparation of the work site is often essential before any cutting or coating removal works can begin. With a range of dredge systems available from 4” to 12”, UCS engineers high-performance dredge systems to assist with the excavation of seabed sand, gravel, clay or rock.

By utilising electricity instead of hydraulics, UCS dredges offer superior suction and efficiency while eliminating the risk of harmful leakage to the environment. Our technical innovations help to improve productivity while maximising safety.

Underwater Cutting Solutions (UCS) designs and engineers an extensive array of subsea and topside cutting solutions, suitable for use on caissons, pipelines, tubulars and jackets of various sizes.

The comprehensive range of UCS cutting systems includes diamond wire and dual cut bandsaws, chop saws, hydraulic shears, and abrasive waterjet cutting systems. These can be configured for diver or ROV-deployed use, as many clients move away from traditional methods of diver installation in favour of remote operations.

UCS delivers user-friendly, high performance cutting systems which can be bespoke-engineered to your exact project requirements. International technical support and operational capability is available from highly-experienced and trained UCS technicians.