80 |
OilfieldTechnology
February
2014
forunder‑deckbasket carouselsand toa tower foron‑deckbasket
carousels.Rangeofmotionanddegreesof freedomvarybasedon
the locationof thecarousel andclient requirements, but thebasisof
design is toapplya lateral force to theproduct toadjust the radial
position relative to thecore.However, fora reel carousel a level‑wind
towerwouldbeprovided, consistingof aplatform throughwhich the
product runs, assistingspoolingby fleeting inaverticaldirection,
elevating relative to thecarousel floor togive the requiredwrap
position.
Typically, laysystemswill alsoconsistof aspooling tensioner, to
providea low tension to theproduct toassistwrapping intooroutof
thecarousel.Onceclearof thestorageequipment initiationwinches
areoftenbeused toengage theproductwith the laysystemand
shouldabandonmentand recoverbe required, additionalwinches
andstorageareprovidedallowingoperations tobesafely resumedby
pullingbackalong the firing lineuntil the laysystemcan takecontrol.
Tocommence layoperationsan initiationwinch isattached to
theproduct in thecarousel. Thewinchappliesa tensionandpulls
or ‘initiates’ product through thesystem. The initiationwinch is
disconnectedwhen theproducthas reached the lay tensioner. A lay
tensioner controls the line tensionof thesystems for themajority
ofoperationsutilisinganumberof tracks toprevent theproduct
from free falling to theseabed, lay tensionerscanbeorientated
horizontallyorvertically.Where thespecifiedbend radiusof the
productunderhigh tensioncannotbemaintainedbyahorizontal
tensionerand laychute, the requirement foravertical lay tower
becomesanecessityand the lay tensioner is rotated90˚. This
enablessignificantlyhigherhang‑offcapacities tobeappliedwhilst
maintainingproduct integrity, as theproduct isno longerbent
under tensionas load isappliedaxially.Onavertical laysystem the
product is routed to its layorientationbeforeanysignificant tension
isapplied. This isachievedviachutes, centralisersandanaligner
wheel. Additional complicatedsystemscanprovidecompanieswith
simpleways tomanipulateadditional itemssuchasPLETs,whichare
built into the tower structure.
Acontrol andmonitoringsystem issupplied toalloweaseof
operatingeveryFLS. This includes integrationwithcarousels, third
partyequipmentaswell asavessel’sdynamicpositioningsystem.
IHCEBbuilds itsowncontrol systems, utilising industryproven
equipment, andensures thehighest levelsof international safetyand
qualitystandardsaremet.
Recent carouselshavebeensuppliedaspartof a rangeof
FLSvesselsunder constructionby IHCMerwede toservicePetrobras’
requirements inBrazil. The2000 tand500 tunder‑deckbasket
carouselsaredue fordelivery toBrazil, supplied toSapuraNavegação
Marítima foruseonboarda300 t laycapacityVLSsystem.
A further fivevesselsarecurrently inbuild forSapuraNavegação
Marítima, the firstofwhich, the
SapuraDiamante
,has justbeen
launched foradelivery in2014.The
SapuraDiamante
isthe first fully
integratedFLSvesselproducedbytheOffshoreDivisionof IHCMerwede.
Thekeyadvantagetotheclientofan integratedsolution isareduced
numberof interfaces.Thesinglepointofcontactandcompletecontract
mitigatesthe inherentrisktotheclientposedbetweenthevessel’s
shipyardandthirdpartymissionequipmentsuppliers.
Conclusion
Thehydraulic roller suspensionsystem iskey toprovidinga reliable
highcapacitycarousel, andsuchasystem looks likely tobean
important requirement foryears tocomeasdemand forever larger
volumeequipment continues.
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SCIENTIFICDRILLING INTERNATIONAL
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