LM OTEC Mini Spar Design_December 2011 - Hawaii National ...

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Component/SubsystemGeneratorProcess ControlTransformersSubmarine CableGrid EmulatorType Maturity Level Development Required? Further Action Required?1800 rpm, 60 Hz, Synchronis,4160 voltclosed loop control overturbine speed, generatoroutput, and grid demand.Likely oil cooled, severalmanufacturers are capable ofproducing these.ABB, Nexans, JDR, Prysmian,DrakaVarious vendors forsubsystem componentsHigh, however will beoperating in non‐standardenvironment and will betransported in non‐standardorientationHighHighHigh/med, dynamic cableswith matching requirementshave been certified, but havenot yet been installed.Low, basic requirementshave been defined for theemulator. Assume most ofthe hardware will beleveraged from existing loadbank technology. Softwarecontrols needed are likelyunavailable at this timeWork closely with generatormanufacturer to understandrisks and implicationsassociated with side loadsduring transport and flip.Yes, to insure that withOTEC's existing working fluidparameters that speedregulation can be maintainedwell enough to produce gridquality powerReview for tolerance to sideloadingThe cable and associatedancillary equipment will becustomized for ourapplication. Analysis andcore sample testing will likelyneed to occur.Investment will be requiredto perform a proof ofconcept, scaled modeling,and in vendor developmentcosts.Analysis of generator'sfoundation and bearing loadswill be required to insuresurvivability during upendingprocessEngage with turbinegeneratorvendors andprocess control consultantsto take a refined look atOTEC's working fluid cycle.Analysis of transformerconstruction methods andfoundation needed to insuresurvivability during upendingprocess.Assuming the certified cabledesigns can be utilized, likelyvery little beyond the typicalcost of design & testing ofthe custom cable.Significant investmentrequired to develop thebaseline design, testing, andwork with vendors toassemble of the finalproduct.Configuration Report and Development Plan Volume 4Site Specific OTEC Pilot Plant 180
Component/SubsystemType Maturity Level Development Required? Further Action Required?Intake screens Varies High, but for land basedcoastal power plantapplicationsYes, designing screenstructure to be easilyinspected and cleaned bydiver or rov.Yes, review existing COTShardware for remoteinspection, the designscreens to accommodatewhatever inspection andcleaning method is adapted.Biofouling ProtectionSodium hypochloriteinjection unitHighNot of chlorination hardwarebut development of meansfor dispersing and mixing itwith the flows to be treated.CFD analysis of flow regimesto insure that chlorinationprocess is adequatelydistributed on intake andadequately dispersed ondischarge.PlatformVessel Multi‐cell spar High None NoneMooring System Semi taut/Taut wire rope + High None NonechainAnchorsDrag embedment ‐ "Bruce"Style AnchorHigh None Survey for conclusiveevidence of adequatesedimentPlatform Auxiliary Systems Various High None NoneSupport VesselsCrew Transfer Type High None NoneInstallation Type High None NoneInspection, exteriorcomponentsROVs ‐ CWP, bottom cage,other deep equipment(Inspection plus intervention)HighNo development necessaryfor routine inspection andminor intervention tasks thatcan be accomplished withwork class vehiclemanipulator. Yes for majorintervention tasks like pumpswap out.Review of existing hardwareto identify what systems areapplicable and to determinewhat changes to structureneed to be made toaccommodate ROVinspection and servicingConfiguration Report and Development Plan Volume 4Site Specific OTEC Pilot Plant 181
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NAVFAC Ocean Thermal EnergyConversi
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ContentsExecutive Summary .........
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3.2.2 Risks........................
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Figure 2‐53 CWP Connection Closin
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Figure 2‐110 CWP Hook‐up Step 1
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Table 2‐27 Power Delivery Trade S
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The 2.5‐MW Mini‐Spar’s functi
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1 IntroductionThe Naval Facilities
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Range Facility (PMRF) on Kauai wher
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CriteriaBaseline Floating Option La
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This volume addresses the 2.5‐MW
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2 Configuration Report, CDRL A014;
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platform has an estimated cost of a
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spar’s mild seakeeping motions, t
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vapor continues downward to one of
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MotorMagCouplingPumpFigure 2‐8 Le
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inform OTEC design and regulatory g
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Figure 2‐12 Cell Spar Coupled Ana
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Table 2‐4 Extreme Anchor Loads In
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2.3.4.2 CWP Fatigue Loads and Strai
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97% value is plotted, showing that
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2.4 Platform and Mooring Segment2.4
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2.4.2.1.1 Cell ArrangementThe OTEC
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Hydrodynamic analysis to date has f
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Figure 2‐19 AccommodationsSource:
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d. (2) Able Seamen and (1) Ordinary
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Figure 2‐22 Platform Main Deck2.4
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The machinery that is located in th
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The air intake for the machinery sp
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2.4.4.7 Fresh Water SystemsFreshwat
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2.4.4.12 IncineratorAn incinerator
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Figure 2‐25 OTEC Water FlowConfig
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Figure 2‐26 Water Flow Through th
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configurations may be possible. Fur
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Z‐AXIS (+ UP)Z‐AXIS(+ UP)X‐AX
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2.4.7.3 Upright In‐Service Condit
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The hull girder section modulus for
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2.4.10.1.2 Post‐Demonstration Per
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2.4.10.3 Anchor SubsystemThe variou
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The U.S. Navy provides recommendati
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2.4.11 Cold Water Pipe Element2.4.1
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dynamic head with a period in the 1
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Figure 2‐45 First and Second Coll
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2.4.11.2.4 CWP DynamicsThe CWP is s
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cycle, building added conservatism
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Figure 2‐52 CWP Connection to Spa
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often have voids. Although voids ca
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throughout fatigue loading. Fatigue
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De-mister: -45 m Turbine (Datum): 0
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2.5.2 Power Generation Segment Over
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Red = Thermal PowerGreen = Mechanic
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The red‐shaded entries in the tab
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components are shown in Figure 2‐
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Figure 2‐67 Detail of Water Flow
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The temperature and pressure sensor
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2.5.2.6 Condenser Heat ExchangerThe
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condensation process is gravity con
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The Hx is constructed of alternatin
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2.5.2.8 Working Fluid Subsystem2.5.
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Figure 2‐78 OTEC Process Piping D
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Figure 2‐79 Left: Magnetic Drive
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should have external insulation cap
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2.5.3 Electrical Generation Element
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Axial‐impulse turbines, such as i
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The issue of operating in a marine
Page 141 and 142: Figure 2‐86 Functional Block Diag
Page 143 and 144: The requirements for the Power Deli
Page 145 and 146: 2.6.2 Onboard Distribution ElementT
Page 147 and 148: safety risks are mitigated. Further
Page 149 and 150: 2.6.2.7 Power Transmission ElementF
Page 151 and 152: The dynamic stress on the cable is
Page 153 and 154: Figure 2‐94 Submarine Cable Descr
Page 155 and 156: Table 2‐34 Mini‐Spar Motions, 1
Page 157 and 158: 2.6.2.11 Shore Grid Connection Elem
Page 159 and 160: 2.7.2 Computer Integrated Process A
Page 161 and 162: communications protocols used for I
Page 163 and 164: 2.7.3.5 Safety, Security, Communica
Page 165 and 166: VSAT Maritime Satellite Communicati
Page 167 and 168: Instrumentation (TSI) system. Beari
Page 169 and 170: 2.7.4.4 Electrical Power Delivery I
Page 171 and 172: Installation PhaseDetails3. Mooring
Page 173 and 174: 2.8.2.1 Ballast PlanThe ballast pla
Page 175 and 176: #2 Anchor Hook‐upThe spar is towe
Page 177 and 178: Figure 2‐107 Location of CWP Asse
Page 179 and 180: CWP Upending:The CWP is towed to th
Page 181 and 182: 2.8.2.5 Offshore Equipment Installa
Page 183 and 184: The following ground rules and assu
Page 185 and 186: Figure 2‐115 Seawater and Ammonia
Page 187 and 188: 2.8.3.1.4 Removal of Platform from
Page 189 and 190: 3 Development Plan, CDRL A021; 2.5
Page 191: Table 3‐1 Status of Key Technolog
Page 195 and 196: 3.2.2 RisksAny program of this size
Page 197 and 198: Risk NameHeat Exchanger CorrosionCW
Page 199 and 200: The configuration incorporates feat
Page 201 and 202: For the ammonia and seawater pumps,
Page 203 and 204: used. If adequate ground cover does
Page 205 and 206: level for fabrication and assembly.
Page 207 and 208: 3.3.6.5 Long Lead ItemsThe followin
Page 209 and 210: provide for the measurement and con
Page 211 and 212: 3.3.8.2.2 Ammonia CircuitAs the amm
Page 213 and 214: 3.3.8.3 Integration of Machinery Sp
Page 215 and 216: 2. Government‐Industry Partnershi
Page 217 and 218: Verify sensor calibration and proce
Page 219 and 220: 3.3.11 Two‐Year Demonstration Pro
Page 221 and 222: Motions (classic six degrees of fre
Page 223 and 224: one of the flange joints or instrum
Page 225 and 226: Spar also provide a good opportunit
Page 227 and 228: Temperature rises- Submarine cable
Page 229 and 230: will be designed to store the data
Page 231 and 232: Figure 3‐6 Environmental Manageme
Page 233 and 234: Navy to support inherently governme
Page 235 and 236: thresholds. On the whole, the analy
Page 237 and 238: floaters) and nekton (larger motive
Page 239 and 240: Analysis NeedTradeoff analysis of s
Page 241 and 242: GeneralDesign of aquatic and marine
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3.4.2.6.1 Alternative Consideration
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2010; see Appendix J, Table 1) to d
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Qualified marine biologists will id
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solids, is very labor intensive and
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Figure 3‐9 Comparison of Daily Av
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Ocean Engineering should evaluate t
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The OTEC Mini‐Spar is an OTEC pil
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Figure 3‐11 Estimated Environment
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3.5 Program PlansA detailed MS Proj
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3.6 ROM Cost EstimatesThe SSOPP con
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3.7 Financing OptionsIn Section 1,
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AcronymsABSADCPAFBAFFFAH36AHTAHUAHV
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AcronymEBIEDASEEEEIPSEFDCEIPSEISEMC
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AcronymINCOSEINUIPTIR&DIRIGIRPIVIWR
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AcronymDefinitionOCCLOffice of Coas
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AcronymTEAACTEWACTGATHDTLCTLRTNTSIT
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