the university of oklahoma - gas tank powerpoint presentation · 2007. 1. 25. · jaime erazo nick...
TRANSCRIPT
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LucioLucio BoccacciBoccacciJaime Jaime ErazoErazoNick HarmNick HarmZack McGillZack McGillRyan PoseyRyan Posey
University of Oklahoma
HEMIS®
Polymer Composite Gasoline Polymer Composite Gasoline TanksTanks
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IntroductionIntroduction
Project ConsiderationsProject ConsiderationsCurrent Gas TanksCurrent Gas TanksSafety and RegulationsSafety and RegulationsMaterial SelectionMaterial SelectionProcess DesignProcess DesignTank DesignTank DesignFinancial EvaluationsFinancial EvaluationsRisk and UncertaintyRisk and Uncertainty
PurposePurposeTo produce marketable polymer gasoline tanksTo produce marketable polymer gasoline tanksTo propose a competitive and appealing business planTo propose a competitive and appealing business plan
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First StageFirst Stage
Determine limiting factorsDetermine limiting factorsExisting gas tanksExisting gas tanks
CostCostQualityQuality
State and federal regulationsState and federal regulations
These factors These factors mustmust be met, be met, or surpassed, for successful or surpassed, for successful design and plandesign and plan
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Current Gas Tank ComparisonCurrent Gas Tank ComparisonPlasticPlastic
Competitive EdgeCompetitive EdgeVarious materialsVarious materialsPossibly recyclablePossibly recyclableLightweightLightweightAdditives and layersAdditives and layersComplex geometryComplex geometryEmerging product (Emerging product (VisteonVisteon))
Current UsesCurrent UsesAutomobilesAutomobilesBoatsBoatsFarm equipmentFarm equipmentLawn equipmentLawn equipmentMotorcyclesMotorcyclesRace CarsRace Cars
SteelSteel20 gauge low Carbon20 gauge low CarbonCompetitive EdgeCompetitive Edge
Historical useHistorical useTypesTypesStrongStrongLow diffusionLow diffusionRecyclableRecyclable
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Cost ComparisonCost Comparison
VisteonVisteonSix layer designSix layer design
High density polyethylene High density polyethylene structurestructureEthylene vinyl alcohol barrier Ethylene vinyl alcohol barrier layerlayerLinear low density polyethylene Linear low density polyethylene adhesive layeradhesive layer
Blow molding processBlow molding processEstimated selling price $53.00Estimated selling price $53.00
Sold directly to automobile Sold directly to automobile manufacturermanufacturer
Price based on 15% return on Price based on 15% return on investmentinvestment
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Federal RegulationsFederal Regulations
U.S. Department of TransportationU.S. Department of TransportationFederal Motor Vehicle Safety Standards and Federal Motor Vehicle Safety Standards and Regulations, Post Crash Standard No. 301 crash Regulations, Post Crash Standard No. 301 crash requirements requirements
Frontal BarrierFrontal BarrierRear MovingRear MovingLateral MovingLateral MovingStatic RolloverStatic Rollover
Purpose Purpose Reduce deaths and injuriesReduce deaths and injuries
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Federal Regulations Federal Regulations
Fuel spillage limits for each crash testFuel spillage limits for each crash test28 g from impact until cessation of motion28 g from impact until cessation of motion142 g in next 5 minutes 142 g in next 5 minutes 25 g per minute in next 25 minutes25 g per minute in next 25 minutes
Other requirementsOther requirementsParking brake disengagedParking brake disengagedTransmission in neutralTransmission in neutral90 90 –– 95% full fuel system95% full fuel system
Including hoses and activated pumpsIncluding hoses and activated pumps
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Federal RegulationsFederal RegulationsVehicle must pass 2 evaporative emissions testsVehicle must pass 2 evaporative emissions tests
Using SHED (sealed housing for evaporative determination) Using SHED (sealed housing for evaporative determination)
2 grams of hydrocarbon in a 24 hr period2 grams of hydrocarbon in a 24 hr periodIncludes one hour hot soak testIncludes one hour hot soak test
0.05 g/mi loss test standard under normal driving 0.05 g/mi loss test standard under normal driving conditionsconditions
Environmental Protection AgencyEnvironmental Protection AgencyExtended Evaporative Emissions TestExtended Evaporative Emissions Test
Future standardFuture standardCalifornia plans 0.35 g/dayCalifornia plans 0.35 g/day ““zero emissionszero emissions”” standardstandardOther states will followOther states will follow
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First Stage SummaryFirst Stage SummaryDesignDesign
Capitalize on advantagesCapitalize on advantagesPlastic is inexpensivePlastic is inexpensiveStudy numerous material optionsStudy numerous material optionsAdditives and layersAdditives and layers
Improve on possible weak pointsImprove on possible weak pointsStrengthStrengthDiffusionDiffusion
RegulationsRegulationsComparison of mechanical properties of materialsComparison of mechanical properties of materialsDetermination of diffusion modelDetermination of diffusion modelSet Set ““near zeronear zero”” emissions goalemissions goal
Pass all current Federal and State regulationsPass all current Federal and State regulationsPass future regulationsPass future regulations
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Second StageSecond Stage
Materials selectionMaterials selectionIdentify feasible materialsIdentify feasible materials
Structure and propertiesStructure and propertiesConsider additivesConsider additivesConsider multiple layer designConsider multiple layer design
Mechanical propertiesMechanical propertiesDiffusion modelDiffusion model
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Materials IdentifiedMaterials Identified
SelectionSelectionBased on propertiesBased on propertiesFeasibility of designFeasibility of design
MaterialsMaterialsHigh density polyethylene (HDPE)High density polyethylene (HDPE)NylonNylonGlass filled nylonGlass filled nylonEpoxiesEpoxiesPolyurethanePolyurethaneEthylene vinyl alcohol (EVOH)Ethylene vinyl alcohol (EVOH)KYNARKYNAR®® ((polyvinyldenefluoridepolyvinyldenefluoride))CurvCurv®® (polypropylene product)(polypropylene product)
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Mechanical PropertiesMechanical Properties
Tensile strength/Yield strengthTensile strength/Yield strengthAbrasion resistanceAbrasion resistance
Rockwell hardnessRockwell hardness
Puncture resistancePuncture resistanceHigh speed puncture testHigh speed puncture test
Flexural strengthFlexural strengthCharpyCharpy impact energyimpact energy
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Mechanical PropertiesMechanical Properties
CharpyCharpy Impact EnergyImpact EnergyResistance to impactResistance to impactLinear with thicknessLinear with thickness
Simulates actual Simulates actual impactimpactUsed to compare Used to compare materials to steelmaterials to steel
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CharpyCharpy Impact Relation to Impact Relation to ThicknessThickness
Directly related to thicknessDirectly related to thicknessLinear relationshipLinear relationship
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ThicknessThickness CalculationCalculationU=Total impact energy (J)
Udes=Desired total impact energy
Chi=Charpy impact strength of material i (J/cm²)
Bs=thickness of steel tank
D=width of test sample
B=thickness of material needed to make its strength equal to TEdes
DBCHU ss ∗∗=DCH
UBi
des
∗=
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Thickness and StrengthThickness and Strength
1.3712.0Curv9.651.7Nylon 12 30% glass10.251.6Nylon 12 20% glass6.842.4Nylon 129.651.7Nylon 6/6 30% glass16.401.0Nylon 6/6 20% glass4.823.4Nylon 6/69.111.8Nylon 6 30% glass9.651.7Nylon 6 20% glass30.950.5Nylon 6 10% glass3.155.2Nylon 62.416.8HDPE0.91216.91020 Steel
Thickness (mm)Charpy Impact Energy (J/cm2)Material
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Diffusion ModelDiffusion ModelDiffusion through Diffusion through walls needs to meet walls needs to meet EPA emissions EPA emissions regulationsregulationsOne dimensional, One dimensional, steady state diffusion steady state diffusion through barrier through barrier (hydrophilic) layer (hydrophilic) layer needs to be needs to be investigatedinvestigated
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Diffusion ResistancesDiffusion Resistances
Adsorption Adsorption –– Governed by HenryGoverned by Henry’’s s LawLaw
c= Concentrationc= ConcentrationS= HenryS= Henry’’s solubility coefficients solubility coefficientp= vapor pressure of gasp= vapor pressure of gas
Liquid diffusion negligible Liquid diffusion negligible Surface should be hydrophilicSurface should be hydrophilicGasoline is hydrophobicGasoline is hydrophobic
pSc ×=
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Diffusion Resistance Cont. Diffusion Resistance Cont.
FickFick’’ss Law of DiffusionLaw of Diffusion
Na = Flux outNa = Flux outDDabab= Diffusion Coefficient= Diffusion CoefficientCa= ConcentrationCa= Concentrationz= Thicknessz= Thickness
dzdcDN a
abaz ×=
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Diffusion Resistance Cont.Diffusion Resistance Cont.
DesorptionDesorption/ Convection/ ConvectionDesorptionDesorption governed by Henrygoverned by Henry’’s Laws LawCorrelation for Convective Mass Correlation for Convective Mass Transfer CoefficientTransfer Coefficient
)Re332.0( 3/15.0 SclDk lab
c ×××=
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Diffusion Resistance Cont. Diffusion Resistance Cont.
Assumptions for Local Assumptions for Local ReynoldReynold’’ssNumberNumber
Pressure = 1 Pressure = 1 atmatmTemperature= 300 KTemperature= 300 KNatural Convection = 0.0833 ft/s Natural Convection = 0.0833 ft/s
Local Length for Correlation = Local Length for Correlation = 0.833 ft0.833 ft
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Diffusion Resistance Cont.Diffusion Resistance Cont.
Convective Mass Transfer Convective Mass Transfer Coefficient = 9.10 x 10Coefficient = 9.10 x 10--4 4 ft/sft/sOverall mass balance yields Overall mass balance yields concentration of 1.25 x 10concentration of 1.25 x 10--1010
mol/cmmol/cm33
Negligible concentration, no Negligible concentration, no boundary layer resistance boundary layer resistance
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Diffusion ModelDiffusion Model
New TermNew Term-- Permeability Permeability
DDabab= Diffusion Coefficient= Diffusion CoefficientS= HenryS= Henry’’s Solubility Coefficients Solubility CoefficientWhy introduce permeability???Why introduce permeability???
Fewer terms will simplify the final equationFewer terms will simplify the final equation
SDP ab ×=
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Diffusion ModelDiffusion Model
Integrated Integrated FickFick’’ss LawLaw
Substituting HenrySubstituting Henry’’s Law, and Permeability s Law, and Permeability
Final Diffusion ModelFinal Diffusion Model
pSC ×=
xccDN aaab
az)( 12 −×
=
SDP ab ×=
xppAPNaz
)( 12 −××=
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Second Stage ResultsSecond Stage Results
Nylon cannot be used aloneNylon cannot be used aloneNeeds polar barrierNeeds polar barrier
Tank will require 2 layersTank will require 2 layersBarrierBarrier-- EVOHEVOHStructuralStructural-- CurvCurv®®, HDPE, or Nylon 6, HDPE, or Nylon 6
41.310.033EVOH7.460.132Kynar1.378607Curv2.417825HDPE3.150.566Nylon 6
Charpy ImpactRequired (mm)
DiffusionThickness (mm)Material
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Third StageThird Stage
Process selectionProcess selectionIdentify and analyze feasible processesIdentify and analyze feasible processes
Injection MoldingInjection MoldingStampingStampingRotational Molding Rotational Molding Blow MoldingBlow Molding
Match materials with processesMatch materials with processes
Compare Returns on investment (ROI)Compare Returns on investment (ROI)Choose processChoose process
Based on profitability Based on profitability
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Injection MoldingInjection Molding
AdvantagesAdvantagesSelf contained Self contained processprocess
DisadvantagesDisadvantagesHigh equipment costHigh equipment costTanks will have Tanks will have seamsseams
Compatible materialsCompatible materialsHDPEHDPENylonNylon
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StampingStamping
AdvantagesAdvantagesSimple processSimple processLow cycle timesLow cycle timesLow maintenanceLow maintenance
DisadvantagesDisadvantagesCannot produce complex Cannot produce complex shapesshapesTanks must contain seamsTanks must contain seams
Compatible materialsCompatible materialsHDPEHDPENylonNylonCurvCurv®®
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Rotational MoldingRotational MoldingAdvantagesAdvantages
Complex geometryComplex geometrySeamlessSeamlessStress free cornersStress free corners
DisadvantagesDisadvantagesLarger labor neededLarger labor neededLower production Lower production volumesvolumesHigh utilitiesHigh utilitiesLarge machineryLarge machinery
Compatible MaterialsCompatible MaterialsNylonNylonHDPE HDPE
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Blow MoldingBlow Molding
Compatible MaterialsCompatible MaterialsNylonNylonHDPEHDPE
AdvantagesAdvantagesLarge volumesLarge volumesLow cycle timesLow cycle times
DisadvantagesDisadvantagesLoss of trimmed materialLoss of trimmed material
20 20 -- 30 % of total part30 % of total partHigh pressureHigh pressure
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Process SpreadsheetProcess Spreadsheet
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Process Spreadsheet Cont.Process Spreadsheet Cont.
InputInputPlant capacity, annual working days, daily Plant capacity, annual working days, daily working hoursworking hours
OutputOutputMaterial costsMaterial costsEquipment costsEquipment costsUtility costsUtility costsTank specificationsTank specifications
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Financial EvaluationFinancial Evaluation
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Third Stage SummaryThird Stage Summary
--9.09.09.09.0Stamping HDPEStamping HDPE15.515.53.63.6Stamping Stamping CurvCurv--16.516.511.111.1RotomoldingRotomolding HDPEHDPE--15.315.343.543.5Injection Molding HDPEInjection Molding HDPE5.25.210.010.0Blow Molding HDPEBlow Molding HDPE
ROI (%)ROI (%)TCI ($million)TCI ($million)ProcessProcess
Nylon excludedNylon excludedSimilar in cost and application to HDPESimilar in cost and application to HDPEHDPE stronger, lighterHDPE stronger, lighter
Stamping Stamping CurvCurvSmallest TCISmallest TCIBest ROIBest ROI
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Fourth StageFourth Stage
Detailed designDetailed designProcessProcessEVOH LayerEVOH LayerJoining tank halvesJoining tank halvesGas tank designGas tank design
Wall layers and thicknessesWall layers and thicknesses
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Stamping Process DiagramStamping Process Diagram
Tank halves produced separatelyTank halves produced separatelyFlanges on each half used to join togetherFlanges on each half used to join together
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EVOH LayerEVOH LayerAdhesiveAdhesive
Linear Low Density Polyethylene (LLDPE)Linear Low Density Polyethylene (LLDPE)
Made by spraying EVOHMade by spraying EVOHZeroZero--emission standardsemission standards
35 micron35 micron EVOH layerEVOH layer minimum requirementminimum requirement140 micron EVOH layer will be used140 micron EVOH layer will be used
ProcessProcessMix with solventMix with solvent
Ethanol Ethanol –– 80/20 solvent/water80/20 solvent/water40 wt% solvent mixture40 wt% solvent mixture
Spray on the tankSpray on the tankSolvent evaporatesSolvent evaporates
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Joining HalvesJoining Halves
Heat flanges on sideHeat flanges on sidePress togetherPress togetherSteel RivetsSteel Rivets
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Final Gas Tank DesignFinal Gas Tank DesignConstant wall thicknessConstant wall thicknessDimensions/ShapeDimensions/Shape
Dependent on contractDependent on contractVariability in dimensions:Variability in dimensions:
30 30 -- 36 inches in length 36 inches in length 22 22 -- 28 inches in width28 inches in width7 7 -- 10 inches in height 10 inches in height
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Final StageFinal Stage
Develop business planDevelop business planStrategyStrategy
Program Evaluation and Review Technique (PERT Program Evaluation and Review Technique (PERT diagram)diagram)
Risk and UncertaintyRisk and UncertaintyOptimal locationOptimal location
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Pert DiagramPert Diagram
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Pert DiagramPert Diagram
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Risk and UncertaintyRisk and Uncertainty
Determine possible interest levelsDetermine possible interest levelsAssociate a probability to each levelAssociate a probability to each levelGenerate random samples for Generate random samples for CurvCurv®®, , EVOH, LLDPE, and rivet pricesEVOH, LLDPE, and rivet pricesDevelop scenarios using possible interests Develop scenarios using possible interests and generated pricesand generated pricesCalculate the probability and NPV for each Calculate the probability and NPV for each scenarioscenario
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Possible Outcome ExamplePossible Outcome Example
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Risk CurveRisk CurveRisk Curve
0
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-5.00 -3.00 -1.00 1.00 3.00 5.00 7.00 9.00
NPV (Millions of Dollars)
Ris
k
ENPV(0.64)
OV = 3.92
VaR = 1.77
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Final Stage ConclusionsFinal Stage Conclusions
Stamping Stamping CurvCurv®® with an EVOH barrier with an EVOH barrier Total Capital Investment = $3.61 millionTotal Capital Investment = $3.61 millionROI = 15.5 %ROI = 15.5 %NPV = $3.36 million over 10 year project NPV = $3.36 million over 10 year project lifelife
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Product ComparisonProduct Comparison
CurvCurv®®/EVOH/EVOH$42.00$42.008.1 lbs8.1 lbsRecyclableRecyclable2.3 mm wall thickness2.3 mm wall thickness
HDPE/EVOHHDPE/EVOH$53.00$53.0017.6 lbs17.6 lbsNonNon--recyclablerecyclable4.52 mm wall thickness4.52 mm wall thickness
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RecommendationsRecommendations
Further analyze risk and uncertaintyFurther analyze risk and uncertaintyImprove expansion Improve expansion Gauge market interestGauge market interestExpand automobile models consideredExpand automobile models considered
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Questions?Questions?