Usage and Importance of Blow-Out Preventers

Alex Rogers

The Structural Design Processwww.rdsoil.comRDS is a leading international designer of drilling systems and upgrades for offshore and onshore rigsQuality engineering leadingto effective operations.0AgendaProcess Overview

Initial Design

Load Cases

Design Calculations

Design Report

Check Procedure

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The Structural Design Process1Process OverviewThe Structural Design Process2Explain process in brief, state that experience is experience is mainly secondary steel for mariner and clair ridge and as such process explained will be based on that however, rigs in other locations or oil fields will differ. 2PDMS Model & Preliminary DesignApproximate Section SizesDimensions

Shows General ArrangementEquipment Access

Footer3

Used for first revision of drawings? Based on feed? Based on experience and rules of thumb?

3Basis of DesignStructural Design Brief

Location and UsePrimary, Secondary, Tertiary

Weight Control Report / MEL

MaterialJapanese steel sectionsGrade 500,420,355N/mm2

The Structural Design Process4

Equipment it supports, operational use, exposed to environment or covered, requires access for future maintenance (i.e. replacing equiopment) hazards4 Design AnalysisDesign CodeAISC 360-10EuroCode3DNVNorsok

Computer SoftwareSTAADSESAM

Spreadsheets

Hand CalculationsThe Structural Design Process5

5Load ActionsThe Structural Design Process66The Structural Design Process7Skidding onto Barge

Quay 250t/m rail capacitySkid Shoes required

Deferential between Quay and Barge

Load Out

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The Structural Design Process8Location on Barge

Pitch, Heave and Roll

Accelerations

Tie-downs

Transport8

The Structural Design Process9LiftPadeyes

Shackles

Trunnions

C.O.G. and Angle

Skew Loads

9The Structural Design Process10InstallationSet down from lift

Support Displacement

Bumpers & GuidesBucket & PinCowhorn Bumper

10The Structural Design Process11OperationalDead Loads (1.3)Self WeightPermanent Loads

Variable (1.5)Drilling ForcesUse and Access

Well Position

Stuck Casing/ Pipe

Differential Support

11The Structural Design Process12EnvironmentalWind1,100, 1000 year return periodGust duration (local or global)

Ice10mm on upward surface

Snow0.5KN/m2

Temperature

Seismic

12The Structural Design Process13AccidentalDropped Objects91/2 Collar from 1.5m

Blast Overpressure

Boat Impact

Accidents DO happen! Wise to prepare for them! ALARP approach to risk13Load CombinationsThe Structural Design Process14A100 Year Storm wind + Setback + Max Rotary + Maximum Operating weight + Imposed load. BOperating wind + Setback + Max Rotary + Maximum Operating weight + Imposed load.COperating wind + Partial Setback + Max Hook + Max Operating weight + ImposedD100 year Storm wind + Minimum weightESkidding + Full Setback + Max weight + Operating WindFTransportation. GLiftingHInstallation Impact/SetdownILoadout

STAAD Analysis The Structural Design Process15

15Hand CalculationsThe Structural Design Process16

16Spreadsheet CalculationsFooter17

ConnectionsWelded

Mechanical Fastenings

The Structural Design Process18

Fatigue AnalysisCyclic LoadingOperational Transport Phases

Undertaken using FE Modelling

Add comment regarding ISO 90001, Im sure this has a part here?!

18Design ReportDescription of StructureDesign AssumptionsDrawingsLoads UsedComputer AnalysisInput FileOutputHand CalcsSupplementary DetailsReference Material

The Structural Design Process19

19Check ProcedureInternalCheck PrintsBackdraught

Revision of Drawings

ExternalForce Tech

Auditable Trail

The Structural Design Process20

ss20Process Re-capThe Structural Design Process2121?Questionswww.rdsoil.com

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