OFFSHORE AND SUBSEA | FEATURE
including its HeaveMate controller, a remote controller, and a laptop. The intelligent control system features
a self-learning algorithm, which makes on-site commissioning straightforward. The operator enters only a limited number of situational parameters – the intelligent control system will then automatically configure and optimise itself. The obvious benefit is a minimum of commissioning time. Seatools carries out thorough simulations in each case before installing, to predict the system’s performance in any situation – which again means that only fine-tuning is required on-site. Accuracies (not including
MRU inaccuracies) to less than 1cm or 3%, whichever is worse, are claimed. The design stage includes simulations
of component failures, such as failure of the MRU. Consequences of such failures are analysed, and in this way a system is developed that features fault tolerance. At each AHC winch delivery Seatools and Degra provide an operator training programme to familiarise and train clients’ operators with the system. Optionally, Degra/Seatools operators can be provided to operate the winch throughout the client’s entire offshore operation. Huisman have been designing and building heave compensation systems since
1985. It uses three different systems for active heave compensation: secondary controlled hydraulic winches, frequency controlled electric winches, or hydraulic cylinders. The main advantages of its systems,
it says, are increased weather windows through high compensation speed combined with high payload, low power demand through clever energy management, and redundancy to increase safety. Passing the splash zone is perhaps the most hazardous part of an offshore hoisting operation. This is where loads can suddenly and unpredictably alter as waves strike and buffet the load from side to side and alternately supply and remove
MODULIFT RAISES OFFSHORE TUNNELLING MACHINE
Modulift’s customer, a specialist in tunnelling and micro- tunnelling, had excavated an undersea tunnel and now needed to recover its micro-tunnelling machine from the seabed. The beam had to be designed for use above and below the water. This required consideration of factors such as the of it, and the increased weight of the micro-tunnelling machine Nevertheless, Modulift’s in-house team was able to achieve The bespoke solution was required to meet the stringent DNV
Modulift’s engineering team designed the 6.7m-long lifting beam with eight lifting points. Turnbuckles connected the lifting beam to the tunnelling machine. The beam featured two top lugs and four bottom lugs, and tugger points were installed for manoeuvring the beam into the right orientation before lifting.
the project within eight weeks and this from design and drawings, to fabrication, painting and procurement of rigging.
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