Exploration • Drilling • Field Services
be used to enhance the integrity of structures. Te UHPG’s have exceptional properties with E-modulus that exceed 70 GPa (10 000 ksi) and compressive strengths that exceed 210 MPa (30 400 psi). Tese physical characteristics are particularly beneficial when undertaking structural upgrades, because the UHPG may be injected into members, nodal joints or split sleeves, etc. to reinforce and enhance the integrity of the structure. In particular, because of the exceptional mechanical properties of the UHPGs it is possible to undertake repairs to caissons or piling using fibreglass sleeves or moulds because the high bond and shear strength of the UHPG will provide excellent bond and shear distribution, often eliminating the need for heavy steel clamps. Other remedial areas where the UHPG’s may be applied include corrosion protection and blast wall and firewall strengthening. In addition, the UHPGs are utilised in the
renewables/wind turbine market where the high E-modulus ensures good load transfer and the increased connection stiffness reduces the natural period or frequency of monopile structure, which because of their ‘flexibility’ is often a problem. Te properties and characteristics of the Secutec
materials have been tested by many professionally accredited bodies and noteworthy institutions that include, Delft University of Technology (Netherlands), TNO Building and Construction Research (Netherlands), VdS (Germany), IMMB (Germany) and Te Danish Technological Institute ULO Systems LLC entered the offshore
industry in the 1970s, providing pipeline free- span correction and pile grouting services and
Energising the future
T
he generation of electricity by harnessing offshore wind power has developed rapidly over the last few
years. Owner operators and installation companies are therefore continuing to look at new ways of improving efficiencies and reducing maintenance lifecycle costs using new innovative solutions and technologies. When installing a wind turbine, a delay of more than
a few days between mono pile installation, transition piece placement and grouting operations can be costly as marine growth and other surface debris can quickly appear on the mono pile surface. As surface cleanliness of the pile is critical for effective grouting, all loose debris and marine growth needs to be removed quickly and effectively to prevent any costly problems later on. Proserv Offshore’s Aberdeen facility has designed, developed and manufactured a Marine Growth Removal
14
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successfully introduced to the industry the use of engineered geotextile fabric formworks (‘grout bags’) for pipeline stabilisation. Over the years these techniques have been developed to provide protection of subsea templates and similar structures, and to permit ROV installation and grouting, and at depths of +1000m. Common to all projects, ULO Systems services
undertake the preparation of detailed procedures to ensure complete safety for the installation of the repair, QA/QC, design and testing of specialised grouting materials, procurement and supply, through to offshore operations. ULO Systems strength lies in its experience and knowledge that enables it to engineer the optimum solution for a given situation. ULO Systems LLC programme of prelay and post lay supports is well known by most, that any diameter/height or soil bearing can be overcome to support, protect and stabilise sub sea pipelines, cables and umbilicals, offshore structures like valve boxes and plums. What do risk management need to do to ensure enhancement of existing assets? Tey need to: evaluate age and production levels over past five years; evaluate cost of replacement; has against a 10 year survey and maintenance programme. Has design life been exceeded. Can we extend design life? Yes, in most cases assets installed 25–30 years ago are still in a sound status but do require more survey and maintenance. l
Enter 14 or ✔ at
www.engineerlive.com/iog
H W Lee and R Miles are with ULO Systems LLC (HFZ), Sharjah, UAE.
www.ulosystems.com
(MGR) tool which is deployed from a support vessel and located directly upon the open pile. The surface of the pile is then prepared by lowering a hydraulically controlled cleaning sub frame down the pile; utilising high pressure water jets mounted on a track, a full 360 degrees by 450mm wide path is cleaned around the pile. Once the carriage has
completed a full rotation around the track, the support fabrication is lowered to the next position and the process is repeated in the opposite direction until all the transition area has been prepared to the required standard. Using the Marine Growth Removal tool, a pile of 4.7m
in diameter can be completely prepared to a depth of 8m in less than two hours. Considering it would take a diving
team more than 30 hours to achieve the same result, this is a significant time saving for our customers. l
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Proserve Offshore is based in Kintore, Aberdeenshire, UK.
www.proserv-offshore.com
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