A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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accurate and ready for <strong>the</strong> creation of several variant conditions. Specifically, a condition for water ballast, high density ballast (325 Ib/ft^), and low density ballast (200 Ib/ft^) was created. Included in Appendix B is a series of tables providing POSSE modeling results in a combat load condition for list correction in half degree increments up <strong>to</strong> 3 degrees for fresh water as well as each of <strong>the</strong> two ballast density types, 200 Ib/ft^ and 325 Ib/ftl This information includes: • Tank name • Tank volume • Ballast type density • Tank weight Degree Increment: • Weight • Percent change • A KG • A Trim A 95% usable volume fraction was utilized for all calculations. This value provides for structural internals as well as for any utilities that may be running through <strong>the</strong> spaces. There are no losses due <strong>to</strong> compaction. According <strong>to</strong> <strong>the</strong> vendor, BTI, because <strong>the</strong> water is removed as <strong>the</strong> material settles, all of <strong>the</strong> voids between particles are filled by water and remain filled by water. It must be noted again, however, that a settled bed of Perma Ballast® is an extremely effective barrier against permeation of oxygen - ei<strong>the</strong>r in<strong>to</strong> <strong>the</strong> bed or through it. 30
2.3 Preliminary Decision-Making Cost Estimation All decision making costing or "concept" estimation was performed by Norfolk Naval Shipyard's Structural Engineering and Planning Office (Code 256). This preliminary costing was performed prior <strong>to</strong> any structural analysis. It was presumed that one type of ballast or one location of ballast could be ruled out solely based on cost alone. As a result, a final cost analysis would still need <strong>to</strong> be performed after <strong>the</strong> structural analysis was completed. Cost estimation was performed for a combination of 36 scenarios on <strong>the</strong> 2"'', 4*, and 8* decks. A specific number of man-hours were allocated under each shop for jobs associated with <strong>the</strong> installation of Perma Ballast®. These jobs ranged from <strong>the</strong> opening and closing of voids <strong>to</strong> <strong>the</strong> preparing and painting of any additional structures. The cost estimation was broken down by man-hours and <strong>the</strong>n converted <strong>to</strong> man-days. A <strong>to</strong>tal production cost was <strong>the</strong>n derived from <strong>the</strong> man-days required for tank prepping <strong>the</strong> Perma Ballast® installation. Similarly, material production costs were calculated for prepping a typical void while additional material costs were additionally applied for canning plate installation on <strong>the</strong> 2"^" deck. A canning plate, used <strong>to</strong> enclose only <strong>the</strong> required amount of ballast, would only be utilized in analysis of <strong>the</strong> 2°^ deck because both <strong>the</strong> 4' and 8* decks are completely filled in all of <strong>the</strong> modeling scenarios. Any additional weight added due <strong>to</strong> <strong>the</strong> addition of internal structures or stiffening was also tabulated and tracked. Because <strong>the</strong> 4* and 8* decks did not require canning plates, any costing associated with <strong>the</strong>se decks involved limited material costs and fairly minor production costs. Much of <strong>the</strong> work associated with all <strong>the</strong> tanks includes: • Opening and closing of tanks • Touch-up painting • Removal and reinstallation of accesses 31
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Page 5 and 6: Table of Contents Abstract 3 Acknow
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Page 19 and 20: combined with the
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Page 25 and 26: Tank name Tank volume Ballast type
Page 27 and 28: was successfully performed and <str
Page 29: of each tank's location was added,
Page 33 and 34: All further costin
Page 35 and 36: 2.4 Structural Analysis One tank on
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Page 45 and 46: 3.1 Final POSSE Results The minimum
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structural Analysis for Compartment
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FR 165 - FR 180 Transverse Bulkhead
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Design of Plating for Surface Ships
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Main Deck Shell FR 165 - FR 180 Tra
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Calculations to De
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Stress Calculations: Stiffening k =
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Resulting Pressure on Shell Plating
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Calculations to De
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Stress Calculations for 227 I<stron
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Resulting Pressure on Inner Longitu
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Calculations to De
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Stress Calculations k = coefficient
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Resulting Pressure on Transverse Bu
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MATERIAL WORK SHEET PERMA BALLAST®
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A Solution to the Inherent List on Nimitz Class Aircraft Carriers

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