Ccwwht 1995 O&hue Tec.hfm!mgyCanferewdThis papa was Pmsanbd al the 2Sth Annual OTC m I-buskx, Texas, U S A, &9 May 1G96 Thrn pap was malectad fci prewnlatmn by the OTC Program Cmnmti k4kwiw Wow cd infonmat,on con!amed !m an qMracl subin!lted by the author(s) Contents cd the paper, ac presented have nol been re.wwed by the OIMore Technobg y Conference and are s@@I M correction by tfw wthof(s). % material, qs p-enied, does MI neceuwtly Ad any postin al the Offshore Technology Conlermce w th .&kers Permms!on to c.apy IS rdncled to qn abstwl ot motmore than XX wrd8 Illustrslmrm may K4 be c++ad The ehlracl shwld co@aIn conswucws achmwladgmant C4tire and by -me paper m pfasenwd AbstractInnovative shallow suction anchor piles have been used for permanent mooring of a process and accommodation barge at an oil and gas field developed by ELF Congo in the Gulf of Guinea. The 12 mooring lines, equipped with 5m diameter and 13m high steel suction anchor piles, were successfully installed at the site in July/August 1995. The process barge is scheduled to be connected earfy 1996 for start of production. With a water depth of about 170m, the Nkossa field is the deepest in offshore Western Africa to date. The soils at the site consist of sofl normally consolidated clays, representative of deep water sites. The anchoring system design is presented, together with the description of the suction pile installation by underpressure. The monitored performance of the suction piles during installation is evaluated, including orientation and tilt at touch-down, and penetration rate during suction penetration. The installation behaviour appeared to be very smooth, and the measured penetration resistances were in perfect agreement with the predictions, thus demonstrating the reliability of the design installation method.
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