Subsea Pipelines Design Challenges - IPLOCA

1 Subsea Pipelines Design CHALLENGESP resenters: Mr. Gbenga Suleiman (Lead pipeline Engineer)Mr. A. K. Sangal ( pipeline Engineering Manager)Mr. Oussama Takieddine (Vice President Engineering)PRESENTATION TO IPLOCA BOARD MEMBERS (21stAPRIL, 2015)1 Beyond the Possible2 Beyond the PossibleWednesday, May 06, 2015 NPCC ENGINEERING CAPABILITIES3 NPCC ENGINEERING CAPABILITIESB eyond the PossibleONE STOP SHOP Conceptual Engineering FEED and Basic Engineering Detailed Engineering Constructability Engineering Review Construction Engineering Installation Engineering Naval EngineeringWednesday, May 06, 20154 NPCC ENGINEERING CAPABILITIESB eyond the PossibleWednesday, May 06.

2 2015 Offshore / Onshore upstream facilities Well Fluid Gathering Separation System Gas Compression Gas Dehydration Fuel Gas Treatment Produced Water Treatment and Disposal Sand Treatment / Separation Water and Gas Injection Facilities Crude / Products Storage Flare, Vent and Drain Systems Utilities (Inst. Air / Cooling Water / Hot Water etc.) Power System Te l e c o m Control Systems Buildings: Accommodation and Technical BuildingNPCC ENGINEERING EXPERIENCE5 NPCC ENGINEERING CAPABILITIESB eyond the PossibleWednesday, May 06, 2015 Our offshore capabilities includes Subsea Pipelines , cables and flexible engineering Design , as well as onshore pipeline Design ENGINEERING EXPERIENCEOFFSHORE pipeline AND FLEXIBLESONSHORE pipeline DESIGNR oute SelectionRight-of-way selectionWall Thickness CalculationWall Thickness CalculationStability / Expansion AnalysisAnti-Buoyancy MeasuresRiser Stress AnalysisPiping / pipeline Stress AnalysisGlobal Buckling (Lateral & Upheaval)

3 Road and River crossingOther Detailed Engineering ActivitiesCathodic Protection (ICCP)6 Beyond the PossibleWednesday, May 06, 2015 ENGINEERING STRENGTHNPCC ENGINEERING CAPABILITIESNPCC Engineering India (NEL)NPCC Engineering - Abu Dhabi BaseWe also have about 275 staff in other engineering support center India VP EEDPEMPROCESS & SAFETYE&IMECHANICALPIPINGPIPELINESTRUCTU RALCIVILNAVALSERVICES & PL/QATECH SUPPORT12122306691133547 PEMPROCESS & SAFETYE&IMECHANICALPIPINGPIPELINESTRUCTU RALCIVILNAVALSERVICES TECH SUPPORT011430659287 Beyond the PossibleWednesday, May 06, 2015340490465430470626750701001151201602 09250020040060080010001200 NPCCNELE ngineering ManpowerForecast8356305505805904101.

4 000 ENGINEERING MANPOWER HISTOGRAMOver 95% of our workforce are permanent staffNPCC ENGINEERING CAPABILITIES8 Beyond the PossibleWednesday, May 06, 2015 TECHNICAL PRESENTATION9 CONTENTS1. Pipelines /CABLES ROUTE SELECTIONG eneral Route Selection CriteriaRoute Selection ChallengesNew Approach to Route Selection2. Pipelines /CABLES STABILITY ON SEABEDC oncept of Stability DesignConventional Approach to Stability Design & Mitigation MethodNew Approach to Stability Design & Mitigation Method3. SOME EMERGING TECHNOLOGIES IN Subsea PIPELINESM aterials selectionDesign / AnalysisPipeline IntegrityBeyond the PossibleWednesday, May 06, 201510 Beyond the PossibleWednesday, May 06, 20151.

5 Pipelines /CABLES ROUTE SELECTION11 Pipelines /CABLES ROUTE SELECTION Minimize route length as much as possible. Minimize health and safety risk and ensure marine life sustainability. Consider environmental and regulatory factors. Optimise flow assurance (minimize pressure losses). Minimize pipeline free spans and amount of intervention work. Consider the piggability philosophy of the pipeline . Avoid Flare Heat Affected Zone (HAZ), dropped object areas, the PossibleGENERAL ROUTE SELECTION CRITERIAW ednesday, May 06, 201512 Pipelines /CABLES ROUTE SELECTION Avoid boulders, pockmarks, submarine exercise area, dredging, wrecks, fishing areas, etc.

6 Avoid Sabkha areas (Onshore) Avoid pre-defined areas due to existing infrastructure and geo-technically unstable areas Minimize local slide risk (avoiding the steepest slopes) Minimize and/or avoid crossings on curves and within proximity of existing crossings, wherever possible. Ensure crossing angle, if required, is not less than 30 Beyond the PossibleROUTE SELECTION CRITERIA CONT , May 06, 201513 Pipelines /CABLES ROUTE SELECTION Seabed features Boulders, Rocks, Rough bottom, and Steep slope which are susceptible to landslide. Seabed obstructions from existing structures wrecks, PLEM, PLET, Construction limitations shore/platform approaches, bend radius, laybarge draft, etc.

7 Other seabed, users, shipping lanes, fishing, dredging, exclusion zones, the PossibleROUTE SELECTION CHALLENGESW ednesday, May 06, 2015 Wednesday, May 06, 201514 NEW APPROACH TO ROUTE SELECTION - Geographical Information System (GIS) Application used is called ArcGIS It is a real-time method of pipeline and cable route selection. It integrates data from different sources into a centralized databaseused for modeling and analysis based on spatial component It has better precision capability in optimizing route It saves time and cost as compared to the convectional system ofroute selectionBeyond the PossiblePIPELINES/CABLES ROUTE SELECTION Good Geophysical /Geotechnical knowledgehowever, is the PossibleWednesday, May 06, 20152.

8 Pipelines /CABLES STABILITY ON SEABED16 Installed Subsea Pipelines /cables are likely to become unstable under the influence ofhydrodynamic forces and buoyancy effects. Stability of such Pipelines /cables are checked by analysis at the onset of the project Design . Adequate solutions are then considered to prevent the undesired the PossiblePIPELINES/CABLES STABILITY ON SEABEDCONCEPT OF STABILITY DESIGNW ednesday, May 06, 201517 Analysis is usually carried out to determine Pipelines /cables stability requirement using softwareapplications such as:oAGA software, DNV Stablelines, Plus-one software, MITIGATION METHOD Typical mitigation usually recommended for Subsea Pipelines /cables stability correction are.

9 OIncrease system weight by adding concrete weight coatingoAddition of concrete mattressesoUse on Anchor blocks / Screw AnchorsBeyond the PossibleCONVENTIONAL APPROACH TO STABILITY DESIGNPIPELINES/CABLES STABILITY ON SEABEDW ednesday, May 06, 201518 CONVENTIONAL MITIGATION METHOD (CONT D.) other mitigation methods are:oRock-dumping on the installed pipelineoGrout bag installationBeyond the PossiblePIPELINES/CABLES STABILITY ON SEABED19 NEW APPROACH TO STABILITY DESIGNoORCAFLEX - developed for dynamic simulation of Subsea cables - a finite element based software used for optimal pipeline /cables stability analysis.

10 MITIGATION METHODUse of leaded Uraduct and ballasting module for Subsea cable has been used by NPCC in previous projectsoCurrently in use by NPCC in ongoing projectoInstallation is done on the barge,oDivers assistance is not requiredoNo degradation of rope like in concrete mattressoAccurate and efficientUse of Artificial seaweed mattressesoReduce the effect of seawater current on the installed disturbed marine commonly used in this region due to smooth seabed and relatively low current speedBeyond the PossiblePIPELINES/CABLES STABILITY ON SEABED20 Beyond the PossibleWednesday, May 06, 20153.