On Friday April 21st, De Oude Bibliotheek organized a seminar called: “Building on experience – not everything goes as planned”. In this seminar, senior engineers from prominent positions in the field of bottom founded structures, shared their valuable hands-on project experiences with student and young professionals.
The seminar was opened by Jan van der Tempel. He also showed an example of what could happen if a wrong mesh is chosen during modelling: broken steel. After the introduction, Frank Sliggers shared his years of design, fabrication and installation experience at Shell. He started his career in a time where computers, modelling and simulations were not at hand. He showed the tools and methods that were used back then and proudly elaborated on his first project. The next lecture was given by Jan van der Graaf who addressed some key lessons learned in his career including impressive double-lifts of topsides.
After a short coffee break, Pieter Swart from Shell presented the challenges of installing a subsea pipeline. This involved not only engineering challenges, but rare whales who caused hick-ups in the process since the pipeline route had to be shifted to avoid the feeding area of the whales. Then, André van der Stap, associate professor at TU Delft and team leader offshore structures at Shell showed the audience some painful mishaps from the offshore industry. He addressed the challenges induced by freefalling during piling. Also, he elaborated on a collapsed platform resulting from a wave on deck. Non-linear effects like these cannot be simulated and have to be modelled. Jan van der Tempel added to this saying: “Standards come from things we broke and then we learned why it broke and learned from that, in this, modeling with new high performance computers can help us”.
Andrei Metrikine, professor at TU Delft, started the last part of the seminar with his insights in monopiles and he addressed the knowledge gap that exists in monopile-soil interaction. Additionally, he shared some results of experiments on vortex induced vibrations close to the sea bottom. The last lecture of the day was given by Bernard van Hemert who shared the lessons learned concerning bolting twice in the Gemini windfarm. He also addressed the effects of the design on the installation process. As he pointed out, larger sized bolts might be interesting on the drawing board, but decrease workability during installation dramatically since larger tools are needed.
The seminar was ended by Jan van der Tempel wrapping up the rich experience that was shared in this seminar and which is of great value for future offshore projects.