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OFFSHORE
FlexJoint® Technology
The Breakthrough that Changed an IndustryOil States Industries’ FlexJoint® technology was introduced to the offshore petroleum industry in 1976 as a frictionless, maintenance-free alternative to the ball joint. Since then, it has become the industry standard for a wide range of offshore applications where robust, flexible and durable connections are required between surface and seabed.
Developed originally to connect risers and seabed-mount-ed drilling equipment, the breakthrough flexible joint de-sign features a spherical elastomeric flex element capable of withstanding high axial load with pressure while allow-ing optimal flexibility.
Today, its value extends across a variety of applications, from SCRs to moorings – with new deepwater advances on the horizon.
SubseaFlexible Joint
IntermediateFlexible Joint
DiverterFlexible Joint
Gimbal
FlexJoint®
Technology
FlexJoint® AssemblyPressure Containment
Applications
FlexJoint® AssemblyNon-Pressure Containment
Applications
FlexJoint® Drilling Riser SystemsReliable flexibility at the top, intermediate andbottom levels of a drilling riser
Flexible Joint(not shown)
FlexJoint® Deepwater MooringSystemsDeepwater mooring systems using FlexJoint ®
technology on TLPs, riser towers and alternativeapplications
SCR Flexible Jointand Receptacle
MerlinConnector
MerlinConnector
TCAIncludingFlex Element
SteelCatenaryRiser
BCA includingFlex Element
BCAIncludingFlex Element
TCAIncludingFlex Element
FlexJoint® Steel Catenary Riser (SCR) SystemsExport and import applications (multi-purpose fluids) and injection risers on TLPs, FPSOs, SPARs and semi-submersibles
Riser Pull-inSystemCollet
Connector
FlexibleJoint
Flexible JointReceptacle
SteelCatenaryRiser
Tendon Porch
MerlinConnector
Top Connector
BCA includingFlex Element
SLWR Flexible Joint and Receptacle
BCAIncludingFlex Element
TCAIncludingFlex Element
The benefits of FlexJoint® TechnologyOil States FlexJoint technology is trusted industry-wide for providing reli-able, flexible and versatile connections for a growing range of applications, including drilling and production risers, TLPs, SCRs and deepwater moorings.• Highlyreliable:flexible,frictionlesspressure-tightjointsaccommodate extremes of load and motion• Cost-effective:precisionmanufactured,testedandinspectedinour quality-controlled facilities, FlexJoint technology provides long service life and reliable operation• Proven:atdepthsof12,000feet,internalpressuresupto12,000psi,axial loadsof11millionlbs.androtationanglesof±30°• Adaptable:accomodatesaxialloads,rotationrequirements,fatigue condition and temperature variations of today’s most challenging offshore environments – and tomorrow’s
Legendary reliability with FlexJoint technology is a product of Oil States’ rigorous quality control measures, third-party testing protocols, and analysis of customer specifications.
Our highly controlled manufacturing processes and computerized molding ensureprecise tolerances for each elastomeric bearing.
The benefits of FlexJoint® Technology
FlexJoint®
Deepwater Mooring Systems
FlexJoint Tendon Bearing
Oil States is a leading designer, manufacturer, and installer of engineeredcomponents for deepwater mooring systems using FlexJoint technology.
LengthAdjust-mentJoint(LAJ)
Slips/Bowl Assembly
Bottom Connector AssemblyReceptacle
Top ConnectorAssembly(TCA)
VRMT TendonTension MonitoringSystem (TTMS)
Highly reliable and proven, Oil States’ tendon connection systems comprise the following: • TopConnectorAssembly(usesFlexJointTechnologyforthetendonbearing)
• BottomConnectorAssembly(usesFlexJointTechnologyforthetendonbearing)
• Merlin™TLECouplings
• OptionalTendonTensionMonitoringSystem(TTMS)forTLPinstallations
TopConnectorAssembly(TCA)TheTCAisauniqueconnectordesignthatsecuresthetendontothehullwhile
providingadjustmentforpropertendonloading.
TheTCAconsistsofthefollowingmajorsubassemblies: • Abowlandslips-stylelockingmechanismthatincorporatesatendonbearing.
ThisassemblymountsontheTLPhullporch.
• The Length Adjustment Joint (LAJ), which comprises the top joint of the
tendonandisgroovedoveralengthofapproximately1.5to3meters.
TheTCAisengagedusingaremoteoperatedSlipAdjustmentToolthatisremoved
aftertendonlock-off.
BottomConnectorAssembly(BCA)BottomConnectorAssembliesareusedtoconnectthebottomofeachtendonto
theseabed.Theinteractionof internalandexternal lugsmatetheRotoLatch™
to the receptacleas it is lowered intoplace.Disconnectioncanbeachievedby
indexingthelugsandpullingtheRotoLatchverticallyoutoftheReceptacle.The
RotoLok™BottomConnectorsystemretainsthefunctionalandstructuralfeatures
oftheRotoLatchSystem,butincludesamechanismtoprovideabsoluteunlatch-
ingcontrol.
AlternativeApplicationsThe versatility ofOil States’ FlexJoint products offers engineers and designers
great latitude in theapplicationofnewtechnologywhileconformingtoenviron-
mentalandregionalparameters.Flexiblejointscanbeusedatthetopandbottom
offlexible jumpers,while theRotoLatchcanbeusedasanendconnection for
buoyancytankandbottomconnections.
Bottom ConnectorAssembly(BCA)
Load Measurement Unit
RotoLatch™ and RotoLok™ Connectors with integral FlexJoint Tendon Bearing
Merlin TendonConnector
FlexJoint®
Deepwater Mooring Systems
Merlin™ Tendon CouplingsMerlinTLECouplings consist ofmale and female connectorswelded at either
end of the tendon pipe. These unique couplings permit pre-welded tendon
pipesegments30 to90meters long tobesafelyassembledoffshorewithout
welding. Merlin TLE Couplings include a preload against operating
tension, thereby minimizing stress concentrations to extend the service life.
Theconnector'suniquegroovedthreadprofileprovidesclearevidenceofproper
matingandpreventsconnectorback-offunderfatigueloadings.
Tendon Tension Monitoring Systems (TTMS)TheTTMSusespatentedVariableReluctanceMeasurementTechnology(VRMT)
to precisely measure and monitor tendon tension onTLP installations. The
reliabilityand long-termstabilityof this technologyhasbeenprovenondiverse
in-lineTLPtendonapplicationsintheGulfofMexico.TheseinstallationsuseaLoad
Measurement Unit (LMU) near the top of the tendon to house the sensors
and transmitter data used to calculate load, direction and bending moment
informationtoacentralcomputermonitoringstation.
FlexJoint®
Tendon BearingOilStates’tendonbearingsareusedinbothTCAandBCAassemblies.The
tendon bearings minimize the bending moment at the top and bottom of
eachtendon,significantlyreducingfatiguedamagedespitethehightension
andnearlyconstantmotionofthemooredstructure.
Mooring Connection Systems Related Equipment
AlternativeApplicationsThe versatility of Oil States’ FlexJoint products
offersengineersanddesignersgreatlatitudeinthe
application of new technology while conforming to
environmentalandregionalparameters.Flexible
joints can be used at the top and bottom of
flexible jumpers, while the RotoLatch can be
used as an end connection for buoyancy tank
andbottomconnections.
Load Measurement Unit (LMU)
Merlin Connection Make Up
Drilling Riser Systems provide:• Areliableandcosteffectiveleak-proofconnection• Alowangularstiffnessunderhighaxialtensionsand extreme internal pressures • Ameansofreducingthebendingstressesintheriser andthereactionforcestothesubseastack
Oil States is the leading provider of flexible joints for critical connectionsat the top, intermediate, and bottom levels of a drilling riser.
Intermediate Flexible JointThe Intermediate Flexible Joint is a double-ended version of the Subsea
FlexibleJointdesignedforinstallationbelowthetelescopicjoint.Ithasthe
capacitytohandlerotationanglesupto±20°,axialtensionupto4,000kips
andpressureupto3,000psi.Whennecessary,itcanalsowithstandextreme
compressionloadingwithlimitedrotationthroughmetal-to-metalcontactof
itsinternalelements.
Diverter Flexible JointThe Diverter Flexible Joint is installed at the top of the riser below the
diverter housing where it will encounter significant compression. It is
capable of free angular rotation of ±15°, up to 4,000 kips tension and 500
psimaximumpressure. TheDiverter Flexible Joint is available in different
configurations based on the maximum working tension requirements.
TheDiverter II Flexible Joint contains two flex elements (double-ended) for
applications requiring rotationatbothends. Eachflexelementcomprisesa
primaryandsecondaryflexelement.TheDiverterIIIFlexibleJointutilizesone
flexelementforsituationswithonefixedendandtheothersubjecttorotation.
• Providesomnidirectionalangularflexingcapability• Dampensvibrationsandaccommodates shockloadings• OperatesreliablyinanH2Senvironment
FlexJoint®
Drilling Riser System
Subsea Flexible JointThe Subsea Flexible Joint is used to couple the riser
to the subsea stack. It is designed to operate in water
depths up to 12,000 feet and is capable of angular
deflectionof±10°andmaximumaxialtensionupto3,500
kips. This flexible joint is also designed to withstand
extreme internal pressures, tensions and rotations.
Workingpressurerangesfrom600to6,000psi.
BOP Stack with Subsea Flexible Joint
FlexJoint®
Drilling Riser System
Field-proven at MacondoOil States Flexible Joint technology provided the critical seal in capping the Macondo well in 2010. It withstood over-rotation and extreme well bore temperatures and pressures for an extended duration. This sealing technology is only available with the Oil States FlexJoint Assembly.
Gimbal BearingProven through more than 25 years of offshore
application, the Oil States gimbal bearing is
designed to absorb loads imposed on the
spider/riser due to vessel motion. It is installed
directly between the spider and the rotary table
and is composed of two halves, each housing
three or four flex elements depending on the
gimbal bearing diameter size. These gimbal
bearings are available in 49.5”, 60”, and 75” I.D.
sizes.Theflexiblebearingsaremadeofhigh-grade
steelandnitrileelastomerfordurabilityandlong
servicelifeunderharshconditions.
A major coup for the
advancementofFlexJoint
connection technology
camewiththeintroduction
of the Steel Catenary
Riser (SCR) Flexible Joint
ontheShellAugerTension
LegPlatform (TLP) in the
early1990s. TheSCRFlexibleJointbecamekey todeepwater
development because of the ability to adapt its design to
accommodatethedemandingaxialloads,rotationrequirements,
fatigueconditions,pressureandtemperaturevariationspresentin
theGulfofMexicoandotherfielddevelopments.Theimportance
of theSCRFlexibleJoint to futuredeepwaterdevelopmenthas
promptedOilStatestoembarkonthedevelopmentofaSecond-
GenerationSCRFlexibleJointwithgreaterload,rotation,pressure,
andtemperaturecapability.
OilStates'SCRFlexJointTechnologyisreliableandtrustedbythe
offshoreindustryforuseinexportandimportapplications(multi-
phasefluids)onoffshorestructuressuchasTLPs,FPSOs,SPARs
andsemi-submersibles.
1.AlsomanufacturedinPipe-In-Pipe(PIP)configurations.2.AlsomanufacturedinHighPressure-HighTemperature(HPHT)configurations.
FlexJoint®
Steel Catenary Riser System (SCR)
Steel Catenary Riser Systems
Second-GenerationFlexJoint Technology for New Offshore Demands
Deeper,harsherandmorechallengingthanever,theoff-
shoreenvironmentsinwhichourcustomersoperateare
changing.That’sonereasonOilStates isdevelopinga
newgenerationofSCRFlexJointtechnologywitheven
greater load, rotation and temperature capability.This
newtechnologywillprovidearevolutionarydesignand
simpler,morecost-effectiveconfiguration.
• Operatingpressuresinexcessof10,000psi.
• Amoreefficientcoolingmechanismtosupport
higherfluidtemperatureSCRflexiblejointdesigns
• Improveddesigncapableofhigheraxialloads
• Equivalentorimprovedoperatingcapabilities
butwithsavingsinlead-timeandmaterialcost
Ask your Oil States' representative for
additional information.
Gen II FlexJoint Technology Full-scale Prototype Test
FlexJoint®
Steel Catenary Riser System (SCR)
SCRFlexibleJointAccessoriesandServices
FlexJoint®
Steel Catenary Riser System (SCR)
SCR FlexJoint Laydown ToolTo prevent over-rotation and assure proper compression
of the flex element, Oil States can design for purchase
or lease a factory-installed laydown tool that maintains a
predeterminedpreload throughout the installation/laydown
period.Upon recoveryof the riser, the tool is removed to
permitinstallationoftheSCRflexiblejoint.
SCR ReceptacleOne of the most common hang-off methods for an SCR
flexible joint is a basket-style receptacle. Oil States can
design and fabricate receptacles to mate with the platform
interface and provide customer-specified hangoff installation
andazimuth/headingforthebasket.AnSCRReceptacletypi-
cally consists of a cast steel basket housed in a steel plate
structure with lifting eyes for handling. Optional custom
featuressuchasaguidecone,guidebars/platescanbeadded.
OilStatescandesign,fabricateandsupplyinterfacecompo-
nentstoaccommodateeitherreceptacleorpull-ininstallation.
Shipping FrameSafe and secure transport of any SCR flexible
jointassembly fromOilStates’manufacturing facility to the
offshore installation vessel is critical. Oil States offers purpose-built
weldedsteeltransportframesforpurchaseorleasetoprotectindividualflexiblejoints
and installedaccessoriesduring landandsea loadingand transportactivities. Upon request,
two-high,stackableframesareavailabletoreducedeckcongestion.
Pull-inHeadUpon request, Oil States can design and fabricate pull-in
headstomeetthespecificneedsofeachproject.
Welding for Critical Flowline SystemsOilStatesaccommodatescustomerschedulesmoreefficientlyby
supplyingweldingworkincombinationwiththeSCRflexiblejoint.
Thisservicetypicallyincludesthedevelopmentandqualificationof
aweldingprocedurewhich is subsequentlyused to attach ahold
collarSCRriserpipeassemblytotheendoftheSCRflexiblejoint
extension–allaccordingtothemostexactingqualitystandards.
Protective ShroudEncasement of a flexible joint in a shroud during
installation and laydown allows smooth movement of
the flexible joint across the rollers on the fantail of an S-Lay
riser installation vessel. Oil States can provide
guidanceforappropriateshrouddesign.
FlexJoint®
Steel Catenary Riser System (SCR)
Copyright 2015, Oil States Industries, Inc. All rights reserved. IM\4-15\1.5M
Oil States sales and manufacturing facility, Arlington, Texas
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