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

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Figure 2‐99 Computer Integrated I&C Network Topology2.7.2.2 CIPS and Process Control NetworksThe network integrates all the processes, including power generation, the platform management systemand emergency systems. The control network is isolated from the platform network for safety andsecurity reasons. Message exchange with the platform network is controlled by the secure servers. Theservers also include a historian to log data from the process SCADAs. The control networkcommunicates with multiple SCADA systems, each managing a specific process. The control network ishost to multiple processes, including power generation, power transmission, Rankine cyclemanagement, host platform and emergency management system. Each SCADA manages its ownprocess via redundant Fieldbus digital communications to operate the Programmable Logic Controllers(PLC), the Remote Terminal Units (RTU) and the Distributed Control Systems (DCS). Each process runsautonomously, communicating with the CIPS only for parameter exchanges. Electronics andConfiguration Report and Development Plan Volume 4Site Specific <strong>OTEC</strong> Pilot Plant 148
communications protocols used for I&C Fieldbus data links are based on well recognized industrypractices and standards using COTS solutions wherever possible.2.7.3 Platform Management ElementThe platform management element controls all subsystems required to sustain operations at seaincluding Emergency systems, security, Integrated Marine Monitoring System (IMMS), HVAC system andthe electrical power management system.The platform SCADA manages multiple subsystems including:Integrated Marine Monitoring SystemBallast SystemHVAC Control SystemPower Management SystemSecurity Management SystemPlatform Operation LogisticsInformation TechnologyAccommodation Management SystemEntertainment and Recreation2.7.3.1 Integrated Marine Monitoring System (IMMS)The IMMS monitors, reports and provides emergency warnings regarding the safety of the platform andsafety at sea. The following is a list of specialized marine instruments installed to monitor the platformequipment and environment:Metocean data: provides weather and sea condition forecastCollision avoidance Radar: Monitors approaching vesselsGPS: provides real‐time location to track the watch circle and provide accurate global timereferenceInertial Motion Unit: Monitors pitch, roll, heave accelerationCompass: monitors the spar buoy orientationADCP: Monitors sea current profiling below the platformWave height and air gap measurement: Monitors waves for safetyWatch circle tracking and mooring system load cells and mooring lines integrityBallast system control: Monitors and controls the spar buoy freeboardCompartment water tightness integrityWeather station: monitors wind, ambient temperature, humidity, dew point2.7.3.2 Platform Ballast SystemThe platform is fitted with multiple ballast tanks to control the platform attitude on site. The tanks arefitted with level sensors, control valves and pumps to ballast and de‐ballast the platform.Configuration Report and Development Plan Volume 4Site Specific <strong>OTEC</strong> Pilot Plant 149
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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
Page 110 and 111: Red = Thermal PowerGreen = Mechanic
Page 112 and 113: The red‐shaded entries in the tab
Page 115 and 116: components are shown in Figure 2‐
Page 117 and 118: Figure 2‐67 Detail of Water Flow
Page 119 and 120: The temperature and pressure sensor
Page 121 and 122: 2.5.2.6 Condenser Heat ExchangerThe
Page 123 and 124: condensation process is gravity con
Page 125 and 126: The Hx is constructed of alternatin
Page 127 and 128: 2.5.2.8 Working Fluid Subsystem2.5.
Page 129 and 130: Figure 2‐78 OTEC Process Piping D
Page 131 and 132: Figure 2‐79 Left: Magnetic Drive
Page 133 and 134: should have external insulation cap
Page 135 and 136: 2.5.3 Electrical Generation Element
Page 137 and 138: Axial‐impulse turbines, such as i
Page 139 and 140: 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: 2.7.2 Computer Integrated Process A
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 and 192: Table 3‐1 Status of Key Technolog
Page 193 and 194: Component/SubsystemType Maturity Le
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
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3.3.8.2.2 Ammonia CircuitAs the amm
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3.3.8.3 Integration of Machinery Sp
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2. Government‐Industry Partnershi
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Verify sensor calibration and proce
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3.3.11 Two‐Year Demonstration Pro
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Motions (classic six degrees of fre
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one of the flange joints or instrum
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Spar also provide a good opportunit
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Temperature rises- Submarine cable
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will be designed to store the data
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Figure 3‐6 Environmental Manageme
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Navy to support inherently governme
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thresholds. On the whole, the analy
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floaters) and nekton (larger motive
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Analysis NeedTradeoff analysis of s
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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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