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

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