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ISO/TC67/SC4/WG6 N 172 Rev 2TABULATION OF ABBREVIATIONS, DEFINITIONS ANDSYMBOLS USED IN ISO AND API SUBSEA STANDARDSExtracted from published ISO 13628 and API 17 series of standardsUp to date as of: 2006-08-29HOLD – TO BE COMPLETED:Preferred abbreviations and definitions are highlighted as per agreement by APISubcommittee 17 and ISO/TC67/SC4 Workgroup 6 in their joint meeting of 2007XX-YY.Note: Where an ISO 13628 standard have been adopted by API, the definitions andabbreviations in the ISO standard only have been included herein. This applies to: API RP 17A which is an identical adoption of ISO 13628-1:2005API RP 17J which is assumed to be an identical adoption of ISO 13628-2:2006API RP 17C which is an identical adoption of ISO 13628-3:2000API Spec 17E which is an identical adoption of ISO 13628-5:2002API Spec 17F which is assumed to be an identical adoption of ISO 13628-6:2006API Spec 17H which is an identical adoption of ISO 13628-8:2002API Spec 17M which is an identical adoption of ISO 13628-9:2000API Spec 17K which is an identical adoption of ISO 13628-10:2005Originally compiled & updated by: Liv Skjellum Ingebretsen, Norsk Hydro, NorwayWith comments from PoscCaesar (ISO 15926).1

ISO/TC67/SC4/WG6 N 172 Rev 2DEFINITIONSISO 15926 commentsDefined wordDefinitionUsed inAccidental loadLoad(s) which are imposed on theC/WO riser system underabnormal and unplannedconditions.EXAMPLES: Loss of vesselstation-keeping and heavecompensator lock-up.ISO 13628-7The definition is too contextdependent compared with theterm.AgreementUnless otherwise indicated, “byagreement” means “by agreementbetween manufacturer andpurchaser at the time of enquiryand order”ISO 13628-7The definition is too contextdependent compared with theterm.AncillarycomponentComponent used to control theflexible pipe behavior such asbend stiffeners and buoyancymodules.ISO 13628-2General termAncillarycomponentsComponents used to control theflexible pipe behavior, such asbuoyancy aids and fire hoods/boxesISO 13628-10General termAncillaryequipmentAccessory to an umbilical system,which does not form part of themain functional purpose.Examples for an umbilical systemwould be: weak link, buoyancycollar and I-tube or J-tube seals.ISO 13628-5General termAnnulus(ANNULUS)Space between the internalpressure sheath and outer sheath.ISO 13628-2A volume defined as the spacebetween the OD of an innersealing element and the ID ofan outer sealing element of aconcentric pipingconfiguration.NOTE: Permeated gas and liquidis generally free to move and mixin the annulus.Annulus sealassemblyA mechanism which providespressure isolation between eachcasing hanger and the wellheadhousing.API SPEC17DAnnulus sealassemblyDevice which provides pressureisolation between a casing hangerand the wellhead housing.ISO 13628-4Anti-wear layerNon-metallic layer, either extrudedthermoplastic sheath or tapewrapping, used to minimize wearbetween structural layersISO 13628-2API MonogramRegistered mark of the AmericanPetroleum InstituteISO 13628-10Apparent weightWeight in waterWet weightNet liftSubmergedSubmerged weight includingcontent minus buoyancyISO 13628-72The definition is too contextdependent compared with theterm.

ISO/TC67/SC4/WG6 N 172 Rev 2ISO 15926 commentsDefined wordDefinitionUsed inUsed to plot service life againstthe inverse of temperature forsome polymer materials by meansof a log-linear scale.API RP 17BAttachment weldFillet or full penetration weld usedfor attachment of components topipe or couplingISO 13628-7Auxiliary lineConduit (excluding choke and killlines) attached to the outside ofthe riser main pipe.EXAMPLES: Hydraulic supply lineand annulus circulation line.ISO 13628-7Ball jointBall and socket assembly havinga central through-passage equalto or greater than the riser internaldiameter.ISO 13628-7The definition is too contextdependent compared with theterm.weightEffective weightArrhenius plotNOTE: This can be positioned inthe riser string to reduce localbending stresses.BarrierElement forming part of apressure-containing envelopewhich is designed to preventunintentional flow ofproduced/injected fluids,particularly to the externalenvironment.ISO 13628-1ISO 15926: (agreed definition):“A divider that blocks or isintended to block againstpassage”. To better representthis definition the name shouldbe changed, e.g. to “FLUIDPRESSURE BARRIER”BarrierOne or several barrier elementsthat are designed to preventunintended flow of formation fluidISO 13628-7FORMATION PRESSUREBARRIER?Barrier elementDevice that, alone, cannot preventflow from one side to the otherside of itselfISO 13628-7This cannot be correct? Abarrier element is a barrier –see above.Basket(PIPE BASKET)Used for storage and transport offlexible pipe (all pipes are laidfreely into the basket).API RP 17BThe definition is too contextdependent compared with theterm.Bearing stressAverage normal stress on thecontact surfaces of matingsurfacesISO 13628-7BellmouthPart of a guide tube, formed in theshape of a bellmouth, anddesigned to prevent overbendingof the flexible pipeISO 13628-10BellmouthPart of a guide tube, formed in theshape of a bellmouth anddesigned to prevent over-bendingof flexible pipe.ISO 13628-2Bend limiterAny device used to restrictbending of the flexible pipe.NOTE: Bend limiters include bendISO 13628-103A bend limiter that is a part of This a correct definition.

ISO/TC67/SC4/WG6 N 172 Rev 2ISO 15926 commentsDefined wordDefinitionUsed inrestrictors, bend stiffeners andbellmouths.Bend limiterAny device used to restrictbending of a flexible pipe.ISO 13628-2NOTE: Bend limiters include bendrestrictors, bend stiffeners andbellmouths.Bend limiterDevice for limiting the bend radiusof the umbilical by mechanicalmeans.ISO 13628-5NOTE: It typically comprises aseries of interlocking metallic ormoulded rings, applied over theumbilical.Bend radiusRadius of curvature of the flexiblepipe measured from the pipecentreline.ISO 13628-10NOTE: Storage and operatingminimum bend radii are defined in5.3.1.6 and 5.3.1.7.Bend radiusRadius of curvature of the flexiblepipe measured to the pipecentreline.ISO 13628-2NOTE: Storage and operatingminimum bend radius (MBR) aredefined in 6.3.1.Bend radius(BEND POINTRADIUS)Radius of curvature as measuredto the centreline of a conduit, pipeor umbilical.ISO 13628-3Bend restrictorMechanical device that functionsas a mechanical stop and limitsthe local radius of curvature of theflexible pipe to a minimum value.ISO 13628-10Bend restrictorMechanical device that functionsas a mechanical stop and limitsthe local radius of curvature of aflexible pipe or umbilical to aminimum value.ISO 13628-2Bend stiffenerAncillary conically shapedcomponent, which locally supportsthe pipe to limit bending stressesand curvature of the pipe toacceptable levels.NOTE: Bend stiffeners can beeither attached to an end fitting ora support structure where theflexible pipe passes through thebend stiffener.ISO 13628-10Bend stiffenerAncillary conically shapedcomponent which locally supportsISO 13628-24ISO 15926: “A radius which isthe radius of a piping bendmeasured from the centreline”.A bend limiter that is a part of A bend limiter that is a part of

ISO/TC67/SC4/WG6 N 172 Rev 2ISO 15926 commentsDefined wordDefinitionUsed inthe pipe to limit bending stressesand curvature of the pipe toacceptable levels.NOTE: Bend stiffeners can beattached to either an end fitting ora support structure if the flexiblepipe passes through the bendstiffener.Bend stiffenerDevice for limiting the bend radiusof a flexible pipe or umbilical byproviding a localized increase inbending stiffness.ISO 13628-5Bending stiffnessAnalogous to the structuralstiffness of a rigid beam or pipe(modulus of elasticity times thesecond area moment of inertia),except that it can vary to a largeextent with temperature andpressure.ISO 13628-10NOTE: It is often quantified as theproduct of an applied bendingmoment times the resultant bendradius of the pipe.Bending stiffnessAbility of a flexible pipe to resistdeflection when subjected tobending loads at constant tension,pressure and temperatureISO 13628-2Bird-cagingBuckling of the tensile armorwires, which results in significantradial deformation. It is usuallycaused by extreme axialcompression.API RP 17BBird-cagingPhenomenon whereby armourwires locally rearrange with anincrease and/or decrease in pitchcircle diameter as a result ofaccumulated axial and radialstresses in the armour layer(s).ISO 13628-5Blow-outpreventerBOPDevice installed at the wellhead tocontain well-bore pressure eitherin the annular space between thecasing and the tubulars or in anopen hole during drilling,completion, testing or workoverISO 13628-7Bonded pipeFlexible pipe where the steelreinforcement is integrated andbonded to a vulcanizedelastomeric material.ISO 13628-10NOTE: Textile material is includedin the structure to obtain additionalstructural reinforcement or toseparate elastomeric layers.Bonded pipeFlexible pipe in which the steelISO 13628-25

ISO/TC67/SC4/WG6 N 172 Rev 2ISO 15926 commentsDefined wordDefinitionUsed inreinforcement is integrated andbonded to a vulcanizedelastomeric material wheretextile material is included inthe structure to obtainadditional structuralreinforcement or to separateelastomeric layers.BoostPressure maintained on thespring-return side of a subseaactuator for the purposes ofimproving closing-time response.ISO 13628-6BOP adapter jointBOP spannerjointTubing hanger orientation jointspecialized C/WO riser joint usedwhen the C/WO riser is deployedinside a drilling riser and subseaBOP to install and retrieve anorientated subsea tubing hangerISO 13628-7BOP stackAssembly of well controlequipment including BOPs,spools, valves, hydraulicconnectors, and nipples thatconnect to the subsea wellheadNOTE As commonly used, thisterm sometimes includes theLMRP.ISO 13628-7Bore protectorA device which protects internalbore surfaces during drilling orwork-over operations.API SPEC17DBore protectorDevice which protects internalbore surfaces during drilling orwork-over operations.ISO 13628-4Breaker(TEXTILEBREAKERLAYER)Textile layer impregnated withrubber included in various layersin the pipe cross-section to giveadditional strength to the pipe, toaid in reducing propagation of cutsin the pipe and to aid themanufacturing process.NOTE: This layer can beincorporated into either or all ofthe cover, reinforcing layer andliner.ISO 13628-10BundleLaid-up functional componentsand associated fillers in theumbilical prior to sheathing.ISO 13628-5NOTE: Typical functionalcomponents in a bundle includehoses, tubes, electric cables,optical fibre cables.Buoyancy moduleA buoy used in significantAPI RP 17B6ISO 15926: “A wear bushingthat is run into and set in thewellhead or christmas tree toprotect the inside wall againstwear from the drill bit and drillpipe during drilling operations”.The name does not reflect thecontext of the definition.ISO 15926: “A grouping ofparallel lines, wires or tubesreaching from the point ofoperation to the point ofcontrol.”