Qatar PetroleumQatar PetroleumTechnical DirectorateTechnical Directorate

Jassim AlhorJassim AlhorPipelines EngineerPipelines Engineer

Submarine PipelinesSubmarine PipelinesConcept to ImplementationConcept to Implementation

From Concept From Concept ……

To Implementation To Implementation ……

BH-N09 WHJ & Pipelines

12” NGL Pipeline Project

SSIV Project

BH-Arab C Development

Offshore Pipelines ProjectsOffshore Pipelines Projects

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Sub Sea Isolation ValvesSub Sea Isolation Valves

Install Sub Sea Isolation Valves on pipelines Install Sub Sea Isolation Valves on pipelines networks to isolate the networks to isolate the platformsplatforms during during maintenancemaintenance

Project DescriptionProject Description

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PSPS--33 BHBH--M05M05

BHBH--G09G09

Sub Sea Isolation ValvesSub Sea Isolation Valves

New ValvesNew Valves RiserRiser

Spool PieceSpool Piece

SeabedSeabed

SupportsSupports

FlangesFlanges

3D STRESS MODEL3D STRESS MODEL

ModificationModification

ModificationModification

CAESAR IICAESAR II

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Sub Sea Isolation ValvesSub Sea Isolation Valves

My ResponsibilitiesMy Responsibilities••3D Modeling Stages:3D Modeling Stages:

••Review AutoPipe original modelReview AutoPipe original model••ReRe--model using Caesar IImodel using Caesar II••Modify Caesar II modelModify Caesar II model

••Examining Results:Examining Results:••Allowable stresses not exceededAllowable stresses not exceeded••Allowable spans not exceededAllowable spans not exceeded

StressesStresses(MPa)(MPa)

NodesNodes

AutoPipe Stresses (no valves)AutoPipe Stresses (no valves)Caesar II Stresses (no valves)Caesar II Stresses (no valves)Caesar II Stresses (with valves)Caesar II Stresses (with valves)

STRESS PLOTSTRESS PLOT

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BHBH--N09 WHJ ProjectN09 WHJ Project

••No. of Pipelines: 3 + 1 umbilicalNo. of Pipelines: 3 + 1 umbilical••Services:Services:

••High pressure bulkHigh pressure bulk••Low pressure bulkLow pressure bulk••Gas liftGas lift

••Sizes: 8Sizes: 8--12in diameter12in diameter••Total Length: 14km longTotal Length: 14km long••Contract Duration: 1 yearContract Duration: 1 year••Contractor: NPCCContractor: NPCC

Project DescriptionProject Description

BHBH--N09N09

PSPS--33

BHBH--SCSC

BHBH--M05M05

BHBH--G09G09

88”” HP PipelineHP Pipeline

1212”” LP PipelineLP Pipeline& Umbilical& Umbilical

88”” GL PipelineGL Pipeline

New PipelineNew PipelineExisting PipelineExisting Pipeline

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BHBH--N09 WHJ ProjectN09 WHJ ProjectDesign Phase ResponsibilitiesDesign Phase Responsibilities••Review and comment on Review and comment on design reportsdesign reports

Examples:Examples: wall thickness, free spans, crossings, riser spans, pipe wall thickness, free spans, crossings, riser spans, pipe stacking and loading, etc.stacking and loading, etc.

In Depth:In Depth: incorporating new spans code, developing calculation incorporating new spans code, developing calculation sheets, revising allowable spans.sheets, revising allowable spans.

••Review and comment on Review and comment on drawingsdrawingsExamples:Examples: field layout, alignment sheets, risers arrangement, field layout, alignment sheets, risers arrangement, spool pieces layout, protection cages, etc.spool pieces layout, protection cages, etc.

In Depth:In Depth: reviewing protection cage design, improving valves reviewing protection cage design, improving valves protection, ensuring diver access.protection, ensuring diver access.

••Review and comment on Review and comment on procedureprocedureExamples:Examples: concrete coating, coal tar enamel coating, Neoprene concrete coating, coal tar enamel coating, Neoprene coating, spools fabrication, installation, etc.coating, spools fabrication, installation, etc.

In Depth:In Depth: review international codes, review QP specifications, review international codes, review QP specifications, bringing project specifications up to minimum requirements.bringing project specifications up to minimum requirements.

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BHBH--N09 WHJ ProjectN09 WHJ Project

Fabrication Phase ResponsibilitiesFabrication Phase ResponsibilitiesWitness fabrication activitiesWitness fabrication activities

(pipeline spools, anodes installation)(pipeline spools, anodes installation)

Witness coating activitiesWitness coating activities(coal tar, concrete, Neoprene)(coal tar, concrete, Neoprene)

Provide technical supportProvide technical support Presentation to managementPresentation to management

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BHBH--N09 WHJ ProjectN09 WHJ Project

Installation Phase ResponsibilitiesInstallation Phase Responsibilities••Witness pipe laying activitiesWitness pipe laying activities

(start(start--up, layup, lay--down, anode spacing, subsea ROV down, anode spacing, subsea ROV survey, umbilical arraignment & strapping, etc.)survey, umbilical arraignment & strapping, etc.)

••Review installation reportsReview installation reports(laying stresses, etc.)(laying stresses, etc.)

Lay BargeLay Barge

StingerStinger

Firing LineFiring Line 88out ofout of

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1212”” Pipeline RehabilitationPipeline Rehabilitation

Project OverviewProject Overview••from PS1 to from PS1 to MesaieedMesaieed••NGL serviceNGL service••X52 12X52 12”” Diameter & 9.5mm thickDiameter & 9.5mm thick••120km long120km long

•• 89km offshore89km offshore•• 32km onshore32km onshore

••Installed in 1977Installed in 1977••Not operational since 1999Not operational since 1999••Blockage/Leakage extentBlockage/Leakage extent

1212”” NGL Pipeline Land Fall PointNGL Pipeline Land Fall Point

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1212”” Pipeline RehabilitationPipeline Rehabilitation••Work Tendered:Work Tendered:

Developing rehabilitation methodDeveloping rehabilitation methodIdentifying blockage extentIdentifying blockage extentCleaning remaining lengthCleaning remaining lengthRecommending way forwardRecommending way forward

Providing support during:Providing support during:PrePre--tender presentationtender presentationMidMid--tender presentationtender presentationCloseClose--out presentationout presentation

••My Responsibilities:My Responsibilities:Develop methodologyDevelop methodologySurvey siteSurvey siteEvaluate bids technicallyEvaluate bids technicallyRespond to clarificationsRespond to clarifications

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BHBH--Arab C DevelopmentArab C Development

••No. of Pipelines: 12No. of Pipelines: 12••No. of Umbilicals: 10No. of Umbilicals: 10••Services:Services:

••Produced GasProduced Gas••Injection GasInjection Gas••Fuel GasFuel Gas••MakeMake--up Gasup Gas

••Sizes: 6Sizes: 6--12in diameter12in diameter••Total Length: 46km longTotal Length: 46km long

Project DescriptionProject Description

New FacilitiesNew FacilitiesExisting FacilitiesExisting Facilities

WellWellHeadHead

JacketsJackets

PSPS--33

PipelinesPipelines

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BHBH-- Arab C DevelopmentArab C Development

••Reviewed Tender DocumentReviewed Tender Document(Scope of work, design basis, design reports, specifications, dr(Scope of work, design basis, design reports, specifications, drawings) awings)

••Participated in Technical Bids EvaluationParticipated in Technical Bids Evaluation(review offers, review/comment on qualifications, attend eval(review offers, review/comment on qualifications, attend evaluation meetings) uation meetings)

••Reviewed Pipeline Materials Codes & SpecificationsReviewed Pipeline Materials Codes & Specifications(line pipe, flanges, valves, fittings, pigs launchers and rec(line pipe, flanges, valves, fittings, pigs launchers and receivers)eivers)

••Involved in 18Involved in 18”” Dukhan Gas Lift Pipeline IncidentDukhan Gas Lift Pipeline Incident(review incident report, visit incident site, comment on stress (review incident report, visit incident site, comment on stress model)model)

Involvements and ResponsibilitiesInvolvements and Responsibilities

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110 Pages110 Pages

Pipelines Design PremisesPipelines Design Premises

LengthLengthWeightWeight

Wall ThicknessWall ThicknessCollapseCollapseBucklingBuckling

Internal CorrosionInternal CorrosionVertical StabilityVertical StabilityLateral StabilityLateral Stability

InsulationInsulationTemp. ProfileTemp. Profile

ExpansionExpansionVortex LimitsVortex Limits

RiserRiserAnalysisAnalysis

UmbilicalUmbilicalAnalysisAnalysis

Installation Installation AnalysisAnalysis

DefectDefectAnalysisAnalysis

PipelinePipelineAnalysisAnalysis

Riser VortexRiser VortexSpool SpanSpool Span

Wave VelocityWave VelocityStrouhalStrouhal’’ss No.No.

Overall DensityOverall DensityWavesWaves

StabilityStabilityPullPull--in Loadin LoadJJ--tube Clamptube Clamp

Amplification No.Amplification No.WavesWaves

StackingStackingRoll ForcesRoll ForcesPitch ForcesPitch Forces

Stanchion DesignStanchion DesignStanchion WeldStanchion WeldSea FasteningSea Fastening

Deck LoadDeck LoadCable DrumCable Drum

BuckleBuckleFatigueFatigue

Defect LengthDefect LengthFailure PressureFailure Pressure

Safe PressureSafe PressureFailure ModesFailure Modes

DiameterDiameterPressure DropPressure DropDynamic SpansDynamic Spans

Static SpansStatic SpansBar BucklingBar Buckling

Local BucklingLocal BucklingAnodesAnodesWavesWaves

Critical VelocityCritical VelocityAdded MassAdded Mass

Concrete StiffnessConcrete StiffnessDragDrag

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In SummaryIn Summary

Skills GainedSkills Gained••Able to perform detailed offshore pipelines design independentlyAble to perform detailed offshore pipelines design independently••Possess practical experience about pipelines fabrication & instaPossess practical experience about pipelines fabrication & installationllation••Able to use specialized engineering programsAble to use specialized engineering programs

Way ForwardWay Forward••Be exposed to different design philosophies (stalkBe exposed to different design philosophies (stalk--on risers, insulation)on risers, insulation)••Further appreciate multiFurther appreciate multi--discipline interaction (process, structures)discipline interaction (process, structures)••Understand advanced studies in offshore engineering (installatioUnderstand advanced studies in offshore engineering (installationsnsdynamics, geotechnical engineering, safety & environment enginedynamics, geotechnical engineering, safety & environment engineering)ering)

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From Concept From Concept ……

To Implementation To Implementation ……