U.S. NAVY SALVAGE REPORT DEEPWATER HORIZON ... - ESSM

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At the conclusion of the brainstorming session, Captain Keenan (SUPSALV) directed the execution of a quick field test, with an existing vessel, of the effects of crabbing on skimming operations. LT Shaun Hayes and Mr. Bob Urban, PCCI, Inc., conducted a test with an available 205-ft OSV and NOFI CurrentBuster. Figure 3 is from the quick sea trial conducted which showed some initial promise. Limitations: Identified limitations to the proposed solution include: 1. Effective encounter width is limited by 1) the length of the vessel and 2) the angle of “crab” o A typical OSV might be 190 to 250 feet long; at a 20-degree “crab” this equates to a possible increased in encounter width of 65 to 86 feet o A typical towed barge might be 300 to 400 feet long; at a 20-degree “crab” this equates to a possible increase in encounter width of 103 to 137 feet o OSV with CurrentBuster field test identified 12-degree “crab” as optimal given the environmental conditions at the time o A towed barge system would be limited by the towing vessel’s capability and hull and wave resistance of the barge 2. The skimming speed achievable by the system employed o It is anticipated that an OSV could skim at 3 knots and transit at 10-15 knots with skimming system recovered o It is anticipated that a barge could be towed at 3-4 knots while skimming at an angle and towed at 5-7 knots while in transit 3. Relative speed and direction of wind compared to oil skimming o Wind may limit OSV “crabbing” angle due to thruster power limitations o Wind may decrease or increase effective “crabbing” angle of a towed-barge o Wind effects on the skimming system may limit “crabbing” angle 4. Sea-state for transit and for skimming o Sea-state for transit is limited by vessels involved and towing configuration as applicable o Sea-state for skimming is limited by the size of the barrier and the rigging of the employed pump/skimmer Recommendations: 1. Spill operations should plan for single skimmer operations as oil spill matures. 2. When conducting single skimmer operations, the vessels must have the capability of maintaining the “crabbing” angle while skimming and handling collected debris and skimmed oil 3. In anticipation of higher sea state operations, the use of larger OSVs or the development of a towed-barge system is necessary. For a towed-barge system, SUPSALV and NAVSEA can provide personnel to assist with this evaluation to include: D-4
a. Analysis of an adjustable angle-of-attack system using a towed barge to determine requirements and specifications to meet or exceed currently available skimming systems; and b. Numerical and/or scale model testing within a tow-tank with simulated wind to determine optimal angles for anticipated combinations of wind and speed through water (e.g., at the USCG Academy in Groton, NAVSEA Carderock facility, or at MMS facility in New Jersey). SECTION B: Rough Order of Magnitude (ROM) Cost: The cost of the SideSkimming technology would be less than current skimming costs because as a system, it would continue to deploy skimmers (e.g., OceanBusters) but would also make use of the OSVs and barges that skimmers currently offload to. In addition, it is anticipated that the OSVs and barges could operate in rougher waters and hence help protect shorelines when offshore storms create waves that force current skimmers and booms to be retracted. D-5
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SH285-AA-RPT-010 0910-LP-111-8218 U
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Deepwater Horizon Oil Spill Respons
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Chapter 2: Command and Organization
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Chapter 3: Tasking and Funding 6/09
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Chapter 3: Tasking and Funding Pict
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Chapter 4: Mobilization Class V ski
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Chapter 5: Operations Figure 5-1. O
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Chapter 5: Operations • DWH oil w
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Chapter 5: Operations 5-2 Near Shor
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Chapter 5: Operations Resource Coor
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Chapter 5: Operations The VOSS crew
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Chapter 7: Lessons Learned • MARC
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Chapter 7: Lessons Learned unaware
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Final Report, SONS Deepwater Horizo
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Page 228 and 229: SITREP #2: DEEP WATER HORIZON OIL S
Page 230 and 231: SUPSALV SITREP #7: DEEP WATER HORIZ
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Page 234 and 235: SUPSALV SITREP #21: DEEP WATER HORI
Page 236 and 237: SUPSALV SITREP #41: DEEPWATER HORIZ
Page 238 and 239: SUPSALV SITREP #78: DEEPWATER HORIZ
Page 240 and 241: SUPSALV SITREP #121 DEEPWATER HORIZ
Page 242 and 243: SECTION A: Technical Approach: Back
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Page 248 and 249: TRANSMITTAL LETTER This report docu
Page 250 and 251: USCG DEEP WATER HORIZON INVESTIGATI
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U.S. NAVY SALVAGE REPORT DEEPWATER HORIZON ... - ESSM

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