30 EXPLORATION/DRILLING/FIELD SERVICES
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Previously it was required to rely on the WRov vision system when approaching the target, and especially during the cut, which could be difficult and time consuming for the WRov, especially when working around the large diameters found at skirt piles, etc.
Electro/hyraulic umbilical
The new modular systems are now complete with their own front and rear view systems operated through the electro/hydraulic umbilical making it independent of the WRov in cutting operations and consequently allowing the WRov to move off station for other operations
Having cameras and electro/
hydraulic umbilicals as above, it has now been possible to extend the instrumentation of the new cutters to give real time recording of the cut progress and also of the tension present in the diamond wire,
Fig. 2. DP2 size reduced section being lifted.
independent of the WRov telemetry, so further allowing the WRov additional freedom to conduct other operations
Structural integrity
As the main jacket/pile sections are cut the platform obviously looses integrity and to counter this, the new range of cutters are complete with the ability to give a step (or castellated) cut, as illustrated, which constrains the section against lateral movements. This is achieved by including an extra degree of freedom in the cutter to track not only across, but also along the structure axis. o
Enter 30 or ✔ at
www.engineerlive.com/iog Fig. 3. A new modular cutter.
Cpt Giuseppe Ummarino BSc, General Manager, and Peter J. Russell, MSc CEng Sales and Marketing Manager, are with Cutting Underwater Technologies AS, Ålgård, Norway.
www.cut-group.com
EXPLORING PULSE ARC WELDING
roperties and configurations required for pipeline welding are increasingly diverse. Novel welding techniques and equipment are continuously being developed. One of these areas is pulse arc welding. When using standard gas metal arc welding (GMAW) techniques, the work area is limited by our welding conditions (orbital and/or narrow gap), so is transferring metal to the arc. Pulse arc welding widens the available work area, thanks to an increased transfer quality and stability, comparable to spray arc welding, but with a higher energy efficiency. The heat cycle offered by pulse arc welding allows for different mechanical properties and more compact welds. Serimax develops a pulse arc welding system part of their available product range. It offers customers a wider choice of welding solutions.
P
This equipment will be of particular interest on projects involving high strain ageing, corrosion resistant alloy and high strength steel. The new equipment will support both standard and pulse arc welding, in single or dual torch configurations. Tandem mode will also be supported. The architecture will be based on an STX05-PLC, with a new power source and digital interface. It will be driven by a command control, using new software. Serimax has operational centres in six countries, from the deep south of the USA to the coastline of Malaysia and its services cover land and marine pipelines, spooling operations, offshore fabrication and multi-joint activities. o
Enter 30A or ✔ at
www.engineerlive.com/iog Serimax is based in Villepinte, France.
www.serimax.com www.engineerlive.com
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