saga and its mission - viking systems, inc. - ship ... · wadam, wasim and saga hydro the tools for...

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Viking Systems’ core structural assessment software integrates regulatory body requirements by applying world class state-of-the art software managed within one program suite to reliably

assess vessels and offshore structures based upon client and project needs

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Viking Systems’ engineering teams all use SAGA allowing us to operate with a strong team spirit anchored in the pride that comes with using a software system that is tailored to the

needs of our business and people

SAGA and its mission:

Viking Systems International, Inc.Structural Naval Architecture and Offshore Engineering

Annapolis | Houston | Singapore | Palm Beach | Tanzania

Structural Naval Architecture and Offshore Engineering

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Clients and Projects served over nearly two decades:

Oil & Gas (Primarily FPSO and FSO vessels)

Military and Defense (Navy, Coast Guard and Patrol Vessels)

Commercial (offshore supply, cargo, passenger vessels)

Data Flow Charts

SAGA Main Features

Samples (including foundation complexities)

This presentation is intended to give you a comprehensive view into the extensiveamounts of diverse projects done by Viking Systems using a consistent quality approachthat is defined and programmed into the SAGA structural naval architecture program:

Presentation Overview


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Some of Viking’s Clients

American Bureau of Shipping (ABS)

BP, Chevron, ConocoPhillips, Petrobras, Shell, Cobalt

Modec, Sofec, Mitsui

Mustang Engineering, Harvest,

Sembcorp Marine

Tanker Pacific Offshore Terminal (TPOT / OMNI)

Design Firms: Oceaneering, Gibbs & Cox, CSC, SAIC, NETSCO, OGI, VARD, Bristol Harbor Group

US Shipyards: Commercial, US Navy, US Coastguard Vessels

General Dynamics NASSCO, Bollinger Shipyards,

Gunderson, Bay Shipbuilding, AKER Philadelphia, Corn Island,

Alabama Shipyard (BAE), VT Halter Systems


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Oil & Gas (FPSO/FSO, etc)

BP PSVM Angola FPSOCendor MOPU Conversion (Malaysia)Chevron Frade FPSO (FEED / 3rd Party Verification / New Module Install)Chevron Frade FPSO RedevelopmentCNR International FPSO Baobab Ivoirien MV10Cobalt Cameia FPSO (Angola)ConocoPhillips Belanak LPG FSOCOTCO FSO Kome Kribi 1 (Esso Chad)ExxonMobil Yoho FSOHESS North Malay FSOKuito FPSO (ABS)Petrobras UOTE (External Turret)Petrobras FPSO Vidade do Rio de Janeiro MV14Petrobras FSO Cidade de Macae MV15Petrobras FPSO Cidade de Niteroi MV18Petrobras FPSO Cidade de Santos MV20Petrobras FPSO Cidade de Angra dos Reis MV22Petrobras FPSO Cidade de Sao Paulo MV23Petrobras FPSO Cidade de Mangaratiba MV24Petrobras FPSO Cidade deItaguai MV26

Petrobras Cidade de Caraguatatuba MV27Petrobras FPSO Cidade de Campos dos Goytacazes MV29Shell FPSO FluminenseTOTAL KaomboTOTAL PazFlor (DSME)Tullow Ghana FPSO Kwame Hkrumah MV21 (Jubilee Field)Tullow T.E.N. FPSO Ghana50+ FEED and Proposal Projects


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Military and Defense

LCS (Austal Trimaran class of Ships)JHSV (Class of Ships)LCS (Lockheed Monohull)FRC (Class of Ships)OPC (Class of Ships)MLP (Class of Ships)LSD-42 (USS Germantown)LSD-43 (USS Ft McHenry)DDG-67 (USS Cole)DDG-60 (USS Paul Hamilton)LHD-6 (USS Bonhomme Richard)FFG-36 (USS Underwood)LPD-18 (USS New Orleans)LSD-47 (USS Rushmore)DDG-51 (USS Arleigh Burke)DDG-52 (USS Barry)

DDG-53 (USS John Paul Jones)DDG-65 (USS Benfold)DDG-102 (USS Sampson)CG-66 (USS Hue City)CD-56 (USS San Jacinto)CG-57 (USS Lake Champlain)CG-53 (USS Mobile Bay)CG-54 (USS Antietam)CG-47 Life ExtensionCG-17 (USS Lake Erie)CG-71 (USS Cape St. George)Indian Navy Patrol VesselEgyptian Navy Patrol VesselUS Navy Submarine Rescue VesselCorrosion Modeling of 30+ CG, DDG, LHD, LSD vessels


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Commercial

Project America Cruise Vessel (STX)SeaAmerica Cruise and Conference Vessel (STX)Penn Maritime Barge (Alabama Shipyard)Penn Maritime Asphalt Barge (Alabama Shipyard)Matson CV2600 Containerships (Aker Philadelphia)SeaRiver Tanker (Herbert Engineering)NASSCO T-AKE Tankers (Herbert Engineering)OSG Maritrans BargesCorn Island Shipyard Asphalt Barge Ocean Residences Under Sea Resort Vessel Platform Supply VesselSergeant Marine Asphalt Commander Double Hull ConversionVT Halter Marine Barge Projects

Gunderson Marine ProjectsVARD ProjectsOffshore Supply VesselsWork BoatsOther projects


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Common Software is a big part of our Team Approach!

SAGA’s development is focused on where there are no viable commercially available quality products availableSAGA serves our engineering efforts with a focus on software development to control our quality and scheduleWe have developed software and methods in SAGA that are required to make:

Femap the 3D modeling tool throughout the analysis and assessment processHecsalv the loading case preparation toolWADAM, Wasim and SAGA Hydro the tools for loadsNastran the stress solver for strength, fatigue and vibrationDNV-GL’s programs Sestra and Stofat the solution for spectral fatigue calculationsLS-Dyna the solution for impact, collision and explosion studies

We constantly expand and test our program and provide test samples in each report for reviewer to see 100% compatibility coupled with spreadsheet calculationViking offices around the world use this same technology in a 30 person user network allowing our team to have a central approach understood by all our teams SAGA Yielding Evaluation Plot – Worst Among 100’s of cases


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SAGA Flow Chart: Hull Strength Assessment for Offshore Vessel

(Class Independent)

Other Loading Software Supported:

DNV-GL Wasim time domain hydrodynamic software, simulating large amplitude loads

SAGA Class Rule wave, acceleration and hull girder loading

SAGA Hydro for Sinusoidal and Trochoidalwaves with Froude-Krylov effects included

SAGA Dynamic Load Parameter Tool


SAGA Flow Chart:Hull Fatigue Assessment for Offshore Ship

(Class Independent)

Other Fatigue Software Supported:

SAGA Simplistic Fatigue using stress, probability, and Weibull Distribution

SAGA Spectral Fatigue using RMS stress and Rayleigh Distribution

SAGA Spectral fatigue using custom spectrum analyzer and wave spreading

SAGA Fracture using crack growth calculations

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Structural Naval Architecture - Feature Overview

Applied to ships and offshore structures fabricated from steel, aluminum, and composite materials:

Finite Element Model creation and mesh checkingTranslation between Femap, Nastran, Nauticus, Sesam, Ansys, SACS, SafeHull, Veristar, HecsalvApplication of loads from rules or hydrodynamics analysisBalancing of loads in case of a floating structureAssessment of Yielding, Buckling, Fatigue, and Vibration modesApplication of structural criteria from major classification society codes, API, AISC

Gives our teams the tools to focus on solving the structural problems, ensuring a design is adequate and optimal:

Assessment against any number of rules and any number of load cases, with plots showing the maximum response for each structure under design loadsCalculation of paint areas, weld lengths, weights, centers of gravity, etcPlotting of results into typical structure groups to easily understand the results & allowing easy access to the data needed to update structure drawings and create reports


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3-D FEA ModelingRapid creation of finite element models via import of CAD transverse section data, and ABS ISE DataFile formats supported: Autocad .dxf, GHS .gf1, and HECSALV .hul filesSupports assembly of models using SAGA in combination with FEA software such as FEMAP, Patran-Pre, or ANSYSCorrosion Modeling feature by groups or gauging mappingDetailed local models generated from global model, using features like nodal section insertion and beam shapes-to-plate data extractionLocal models are loaded by nodal deflections and rotations, accelerations and pressure loading

Loading Analysis, Balancing, and Interfaces to External ProgramsGrouping of finite elements carried out by SAGA to support naval architecture loading groups; external hull, tanks, deck areas, engine room and other user defined groupsHull groups can be exported in Nastran format for loading by external programs such as WASIM, WADAM, LAMP, or by SAGA using built-in classification society rulesSAGA is used to either inertia balance or position balance eliminating boundary condition influence

Evaluation of ResultsSAGA reads stresses from Nastran and from DNV’s Sestra program in assessing yielding and buckling requirements of classification societies (ABS, BV, & DNV)SAGA performs advanced post-processing of results by establishment of structural buckling regions in combination with material, property, deflection, and stress data from the finite element modelAlong with classification society rules of ABS, DNV, BV, and Lloyds, SAGA is capable of additional custom code checks programmed by user via spreadsheet interface

Structural Naval Architecture - Feature Overview


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Code Compliance Check – Feature Overview

Viking’s structural assessment software, SAGA, is constantly at work on ships and offshore structures, providing design and assessment capabilities on all type of structures, including:

FPSO & FSO vesselsJackup offshore installationsNavy and Coast Guard vesselsShips and bargesHeated cargo VesselsOther ships and floating structures

SAGA uses built-in design code checking (yielding/buckling/fatigue) from below regulatory bodies:ABS FPI RulesABS SVR RulesABS MODU RulesABS HSNC High Speed Naval CraftBV Parts A-D and NI593API RP 2ADNV OS-C101DNV RP-C201, RP-C203, RP-C205, RP-C206


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Corrosion Assessment – Feature Overview

SAGA is used by Viking team members to apply corrosion instructions that have been entered into a database system developed by Viking to manage corrosion gaugings:

Location of gauging including tank and coordinatesGauged thicknessAs built thicknessCalculation of corrosion rates for structure groupsImplementation of future anticipated corrosion Class required steel renewal calculation

Steel renewal at conversion given vessel design life


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SAGA applies the corrosion values by subtracting the FEA model scantlings:

Plate thicknessBeam and Bar Element Stiffener web thicknessBeam and Bar Element Stiffener flange thickness

The model’s gauging database is compared and a corroded model is made:

As built model and database thicknesses are compared and validity checkedPlate thickness and stiffener properties are updatedInterpolation options for elements away from gaugingsPercentage rule minimum corrosion can be appliedDiminution corrosion can be subtracted

Resulting FEA Model with as gauged thickness

Corrosion Assessment – Feature Overview


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SAGA fracture mechanics is used on projects where a standard SN Curve approach is not considered sufficient, such as to estimate time for a crack to grow to a certain size or to become critical. Based upon Paris’ Law, our approach allows for the evaluation of crack growth of external and internal crack types typically found in ship structures.

The loading driving the fatigue stress ranges are defined by a Weibull distribution of a stress range calculated by loading and solving an FEA model. The model program allows us to investigate the effect of:

Initial crack lengthMaterial strengthResidual stress in the structureCompressive stress retardation accounted forCrack retardation models such as WheelerShape geometry effects in case of a damaged area

SAGA calculates a fracture damage ratio where amount of cycles in a

design event is presented as a ratio of amount of cycles to failure.

Damaged areas experiencing cracks can be assessed for safety in operation

SAGA calculates growth of cracks of varying initial size

Fracture & Fatigue Cracks – Feature Overview


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Riser Support Structure AnalysisUpper and Lower RSS Strength & Fatigue Assessments for Spread Moored FPSOs

Global RSS Model

Mesh Refinement IWO RSS Structure

RSS Strength Assessment Plot

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Mooring Support Structural AnalysisMSS Strength & Fatigue Assessment for Spread Moored FPSOs

Global MSS Model

Mesh Refinement IWO Fairlead Structure

MSS Strength Assessment Plot

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Topside Stool Structure AnalysesStool Strength & Fatigue Assessments

Global Deck Sub-Model

SAGA Stool Strength Assessment Plot

SAGA iterates on entire deck sub-

model until slider equilibrium & tracks

reactions and deflections

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Model of A-Frame Foundation & Ship Structure

Model of A-Frame Foundation & Ship Structure

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Helicopter Platform Evaluation & Analysis

Global Model Deck Structure

Deformed Stress Plot – Critical Scenario

Overall Global Model Loading

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Mooring Load VerificationDEC - Ballasted Condition - My Load RAOs

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300000000

400000000

500000000

600000000

700000000

800000000

900000000

1000000000

0.000 5.000 10.000 15.000 20.000 25.000 30.000 35.000

Period (s)

Am

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m/m

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0°

45°

67.5°

90°

112.5°

135°

150°

165°

180°

Turret and Mooring Layout within OrcaFlex

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Results Presentation

SAGA prepares results for our clients using a Virtual Reality Modeling Language (VRML) format viewable in standard web browsers and other programs that read VRML, such as Rhino. The result files are available for use by interested clients wishing to see the results in interactive 3D rather than simply as shown in reports.


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Buckling Assessment Model Global Modeling and Checking Groups for Loads Application

SAGA Samples

SAGA Wave Loading and Balancing SAGA Loads Solved with Nastran SAGA Spectral Fatigue Assessment


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Contact Information

Lars Henriksen | [email protected]

Bo Williams | Director of [email protected]

Fritz Waldorf | Director of Sales and [email protected]


mailto:[email protected]



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