By G. Maier (eds.)
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The launehing procedure is designed to carry the jacket in verticaL position at the end of the Launch trajectory. The buoyancy/weight distPibution of the structure is designed so as to have one equiLibrium position, the verticaL one. Therefore the common upending 11l2noeuvre is not necessary, shortening the time required for maPine operations. A further improvement of the skirt pile concept has been recentLy made possibLe by the deveLopment of the underwater hammer technoLogy, which currentLy provides reLiable means for driving skirt piLes without any need for foLLowers and guides.
Fig. 8 shows some sequenaes of the launah during the rrvdel tests. ction The fabriaation was aarried out at Sao Roque de ParaguaS'ao yard and took about 22 months. Steel Template Platform The adopted assembLy p~ocedu~e fo~esaw peLativeLy Light individuaL p~eassembLed pieces, tied into the st~ctu~e in thei~ finaL Locations (see fig. 9). In fact no ~ow of the st~ctu~e was compLeted on the ~ound, then ~LLed and tied with the othe~ ones. mbe~ L981. The totaL Load out weight was 22000 t and incLuded seventeen caissons, tweLve ~se~s, tweLve j-tubes, tweLve piLes p~einstaLLed onsho~e.
Kielland" accident to suggest attention to 11 these welds cxxrpared to the nany kilareters of other welds in the platfonn. I f the hydrcphone support of the brace D6 had been inspected during cperation, the cracks in quadrants I and III might mt have been detected, even by, say, the use of MPI or dye penetrant inspection, because the fillet welds were particularly unfavourable. For instance, MPI is saidl4 to reliably detect cracks over 100 nm long. The experience fran large structures in laboratories is that (hairline) cracks at weld toes need to be even langer for a reliable visual detection.