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CA1250188A - Wide based semi-submersible vessel - Google Patents

Wide based semi-submersible vessel

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Publication number
CA1250188A
CA1250188A CA000452681A CA452681A CA1250188A CA 1250188 A CA1250188 A CA 1250188A CA 000452681 A CA000452681 A CA 000452681A CA 452681 A CA452681 A CA 452681A CA 1250188 A CA1250188 A CA 1250188A
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Canada
Prior art keywords
vessel
feet
deck
stability
columns
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Expired
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CA000452681A
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French (fr)
Inventor
Paul C. Dahan
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ExxonMobil Oil Corp
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Mobil Oil Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/08Ice-breakers or other vessels or floating structures for operation in ice-infested waters; Ice-breakers, or other vessels or floating structures having equipment specially adapted therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/32Other means for varying the inherent hydrodynamic characteristics of hulls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/107Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413Floating drilling platforms, e.g. carrying water-oil separating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B2001/128Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising underwater connectors between the hulls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B2211/00Applications
    • B63B2211/06Operation in ice-infested waters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Civil Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
  • Traffic Control Systems (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Physical Water Treatments (AREA)
  • Vibration Prevention Devices (AREA)
  • Cleaning Or Clearing Of The Surface Of Open Water (AREA)

Abstract

WIDE BASED SEMI-SUBMERSIBLE VESSEL

ABSTRACT OF THE DISCLOSURE

The present invention as disclosed provides a wide-based, semi-submersible vessel comprising a longitudinally elongated deck (10), means including a plurality of stability columns (20) extending from the deck, elongated pontoon means (30) connected to the lower ends of each of the stability columns for providing a wide buoyant base, the pontoons having the same cross-sectional area along the longitudinal axis thereof, and means (64, 66) in the columns and pontoons for discharg-ing and taking on ballast, characterized in that each of the stability columns extends downwardly and outwardly from the bottom of a respective port or starboard side edge of the deck for changing the effective beam of the vessel as a function of draft.

Description

F_26~s(2105) WI~E BASED SEMI-SUBMERSIBLE VESSEL

The present invention relates to a semi-submersible vessel having a novel arrangement of buoyancy pontoons or footings, stability columns and deck to provide a vessel with improved stability characteristics. A vessel constructed in accordance with the present invention is also particularly suitable for use in ice-infested waters.
The conventional semi-submersible vessel is the product of an evolution in design. During the initial offshore exploration for and production of hydrocarbons, drilling technology was based on shore-side experience. The supporting offshore platforms were either fixed structures or towers built on pilings? or a barge or caiSsOn which was ~loated out to the offshore site and then flooded to rest on the subsea bottom. When further exploration placed wells farther offshore, the increasing water depth required improved structures. The barge or caisson appr~ach evolved into a floating structure having submerged buoyant pontoons or footings, stability columns extending upwardly through the water surface, and a non-buoyant deck on top of the stability columns. The deck supported a drilling rig and other exploration equipment. To minimize the vertical movement of the drilling rig, the cross-sectional area of the stability columns was minimized at the water-line level. The resulting vessels are collectively called semi-submersibles.
While the configuration of offshore supporting structures was evolving to accommodate deeper water, the well locations were also extended into more hostile environments. The first offshore weils were drilled in protected wa~ers close ~o shore. When storms threatened, personnel were evacuated until the danger passed. Today however the frontiers of offshore drillng are located in remote waters far from the shore. The distances from shore prohibit rapid F-2635(2105) - 2 -evacuation in stormy weather, and the offshore platforms are exposed to increasingly severe storms since the waters are not protected by land massesO
8ecause the conventional design of semi-submersibles is a product of evolution through conditions different than those experienced today at remote and often hostile sites, the stability characteristics of the offshore platform do not best accommodate the conditions imposed on the vessel by operation in such remote environments.
Conventional semi-submersibles are deballasted when severe weather strikes to ensure a sufficient air-gap between large waves and the bottom of the deck structure, and to increase the height of the working platform. However, such deballasting has an undesirable effect of exposing more surface to the wind and waves while actually raising the center of gravity and reducing the metacentric height.
There are three facets to the stability phenomenon;
initial, large angle, and damaged. The initial stability of a vessel is the familiar concept of metracentric height (GM). It represents the vessel's resistance to heeling over small angles, up to 5 to 10, and is essentially a characteristic of the vessel's waterplane. The technique of quantifying large angle stability differs from measuring the GM. To measure the stability, the righting arms of the vessel are calculated over a range of heel angles. The area under the resulting curve represents the energy the vessel can absorb. Lastly, damaged stability measures the ability of the vessel to withstand tank or compartment flooding.
Though more subjective then the other aspects of stability, a thorough analysis reveals the vessel's ability to survive ~ithin the design criteria.
Conventional semi-submersibles lose initial stability when deballasting. aecause ballast water is located low in the pontoons, the vertical center of gravity of the vessel (VCG) is raised when it is pumped out, and the GM is reducedO The present rational behind such procedure in adverse weather is that the large angle stability is imp~oved by providing more reserve buoyancy to resist large angle F-263s(2105) 3 heeling as well as increasing the angle to which the vessel may heel before downflooding occurs. Also, when the operators wish to mqve the semi-submersible, the draft is reduced until the pontoons surface. The intermediate condition before the waterplane is dramatically increased with the emergence of the pontoons often presents a situation with marginal stabilityO
The simplistic answer to the problem would be to increase the beam of the vessel until the minimum GM was acceptable.
Unfortunately, too much initial stability is also detrimental. The high accelerations resulting from extreme GM at the operational draft would both degrade the crew and require additional steel throughout the structure to handle the inertial loadings. Further, the entire deck structure itself would increase due to the larger spans encountered between the stability columns.
Another problem occurs in exploiting offshore ice-infested areas where masses of ice continuously form during certain parts of the year. These ice masses may include sheets of ice having thicknesses of eight feet thick or more which may have substantially thicker "pressure ridges". These ice masses are not stationary and may move several hundred feet per day under the influence of surface winds and currents. Obviously, these moving ice masses develop substantial forces which, in turn, may be dbstructive to objects lying in the'path of the ice masses.
In accordance with the present invention, there is provided a wide-based, semi-submersible vessel comprising a longitudinally elongated deck, means including a plurality of stability columns extending from the deck, elongated pontcon means connected to the lower ends of each of the stability columns for providing a wide buoyant base, the pontoons having the same cross-sectional area along the longitudinal axis thereof, and means inthe columns and pontoons for dis~harging and taking on ballast, characteri~ed in that each of the stability columns extends downKardly and outwardly from the bottcm of a respective port or starboard side edge of the deck for changing the effective ke~m of the vessel as a function of draft.

~5~8~

F-2635(2105) - 3a -The present invention solves the stability problem by angling the stability columns outboard from the deck structure to a wider supporting base, and by making the deck structure itself watertight and effective at large angles and when damaged. The wide effective beam at shallow drafts provides greater GM while the F-263s(2105) 4 angularity of the columns limit the stability at deep drafts and does not require additional deck steel. The buoyant deck structure contributes to the large angle stability when immerse~ and provides reserve buoyancy in the event of catastrophic damage, i.e., the loss of a stability column.
The resulting wide based semi-submersible vessel is superior to the conventional design of semi-submersibles. The GM
over the range of drafts can be optimized such that the stability never degrades below minimum values. At the s~me time, the angularity of the columns prevents the GM from becoming excessive.
In all cases, the large angle stability of the wide based semi submersible vessel exceeds that of the conventional straight-legged configuration. When damaged, the wide based semi-submersible vessel better withstands flooding resulting in greater r~sidual righting energy and less danger of downflooding.
It is contemplated that the angularity of the columns with respect to the vertical can be within the range o~ greater than 0 to less than 90.
A semi-submersible vessel is particularly suitable for use in ice-infested waters. The strength of an ice mass in compression is substantially greater than in ~lexure or bending. In accordance with an aspect of the present invention ballast is discharged and taken on when desirable to bring the stability columns into contact with an ice mass. As the vessel rises the outboard surfac~s of the downwardly and outwardly extending columns would exert an upward or bending force against an ice mass located outboard of the vessel to break such mass. Conversely, lowering the vessel causes the inboard surfaces o~ the columns to exert a downward bending force against ice located beneath the deck. Ballast may be continuously taken on and discharged to cyclically lower and raise the vessel when ice conditions are severe.
In the drawings attached to this specification and which illustrate various aspects of the present invention:

FIG. 1 shows a side elevational view of a semi-submersible vessel constructed in accordance with the present invention;
FIG. 2 shows a top plan view of the vessel of FIG. l;
FIG. 3 shows an end elevational view of the vessel of FIG. 1, with a drilling rig;

F 2635(2105) _ 5 _ FIG, 4 is a schematic side elevation view of a baseline vessel having vertical stability columns;
FIG, 5 is an end elevational view of the vessel of FIG. 4;
FIG. 6 is a top plan view of the vessel of FIG. 4;
FIG. 7 is an end elevational vie~ of an embodiment of the present invention wherein the stability columns are angled 10;
FIG. 8 is an end elevational view of an embodiment of the present invention wherein the stability columns are angled 15;
FIG. 9 is an end elevational view of an embodiment o~ the present invention wherein the stability columns are angled 20;
FIG. 10 is an end elevational view of an embodiment of the present invention wherein the stability columns are angled 30;
FIG. 11 shows curves representing characteristics of vessels with differing stability column angularity;
FIGS. 12A-12F show curves of righting arm versus heel angle for the straight legged baseline vessel, and for the wide based semi-submersible vessel configurations in accordance with the instant invention; and FIGS. 13-23 show examples of typical semi-submersible vessel configurations which are modifiable in accordance with the present invention to provide a wide buoyant base and thereby improve stability of such vessels.
With reference to FIGS. 1-3, there is shown a wide based semi-submersible vessel having a watertight buoyant deck 10 supported on three stability columns 20 which extend continuously downwardly and outwardly from the bottom of each outboard side of the deck 10. The three stability columns 20 on each side of the vessel are connected to a respective elongated pontoon 30 to provide a wide buoyant base ~or the vessel 30. As shown in FIG. 3, an example of a structural truss arrangement 40 is provided between each of the opposing three pairs of stability columns 20 and the bottom of the deck 10 to ensure structural integrity of the vessel.
Each one of the three structural truss arrangements 40 has a transverse member 42 interconnecting an opposing respective pair of stability columns 209 a vertical member 44 extending upwardly from ~ , #

F-~635(2105) 6 -the center of the transverse member 42 to the bottom 46 of the deck 10, and a pair of diagonal members 48) 50 extending upwardly from the center of the transverse member 42 to the bottom 46 of the deck 10. The structural truss arrangements may take any form or shape so long as structural integrity of the vessel is maintained.
The deck 10 has a transverse center portion 52, and sponson portions 54~ 56 extendin~ downwardly from each side of the center portion 52 of the deck 10. The inner surfaces 58, 60 of ea~h of the sponsons 54, 56 extend downwardly and outwardly from ~he center portion 52 of the deck 10 at an angle which may correspond ~o the dnwnwardly and outwardly extending three stability columns 20 on each side of the vessel.
The bottom 46 of the deck 10 is constructed to be structurally sufficient to withstand '7wave-slap" loads from the sea, and the entire deck is constructed to be structurally watertight up to the level of the main or weather deck 62.
Sea water ballast, fuel oil, and drilling water are suitably located in tanks 64 located in each of the buoyancy pontoons 30 and in tanks 66 located in each of the stability columns 20. Spaces for propulsion motors and shafting, thrusters, are located in the lower portions of the buoyant pontoon 30. Dry bulk storage for drilling mud and cement may be located in the upper tanks S8 of the stability columns 20 and in the deck 10. Machinery spaces, storage spaces, workshops and living accommodations are also located in the deck 10. The main or weather deck 62 may be used for additional sto~age space, pipe racks drilling rig and other drill equipment and machinery, additional accommodations, dedicated or specialized shops, and equipment, such as fire fighting equipment.

The stability columns 20 are inclined away from the vertical at an angle specifically chosen to enhance the stability characteristics of the vessel, which can be in the range of greater than 0 to less than 90. At the normal operational waterline 80, the effective beam of the vessel, and hence the stability of the vessel, is increased without increasing the span and weight of the deck structure? the increasing effective beam increases the ~, F-263s(~105) 7 stability of the vessel. When deeply ballasted, the low location of the ballast water in the ballast tanks 64 of the buoyancy pontoons 30 lowers the center of gravity of the vessel, and even though the effective beam of the vessel is reduced, the s-tability of the vessel is not impaired.
As shown in FIG. 3, the twin-sponson 54, 56 arrangement forms with the bottom 46 of the deck lû with an inverted "V" shape between the sponsons 54, 56. Such configuration of the bottom 46 of the deck lO impIoves the vessels capacity to resist the impact of "wave-slap" when deeply ballasted while minimizing detrimental interference of the deck lO at operational draft. Further, because the deck lO is watertight throughout, the buoyancy of the deck lû
will prevent capsizing in the event of catastrophic damage, flooding, or other accident.
Following are the results of a study performed to demonstrate the advantages of the present invention:

CONSTRAINTS
Tne semi-submersible hullform used to study the effect of the proposed configuration was based on the MSV "IOLAIR". The "IûLAIR" consists of twin pontoons supporting six stability columns under a buoyant deck. The pontoons are "ship-shape" in that they have a faired bow forward and a ship-form stern supportin9 a ducted propeller. The stability columns are rectangular in cross-section with radiused corners.
In order to highlight the effect of wide based semi-submersible vessel configuration, several simplifications were applied to the "IOLPIR" form as shown in FIGS. 4-6. Primarily, all elements, pontoons 92 and stability columns 949 were regarded as rectangular in section without radiuses, and all six stability columns 94 were given the same dimensions. Further, the forward and aft ends of the pontoons 92 were considered blunt without any fairing. The forward columns were considered flush against the forward perpendicular and the aft columns similarly located against the after perpendicular. The dimensions of both the pontoons 92 and the stability columns 94 were chosen to be thirty-six feet by ~2~
F-2635(2105) twenty-four feet. The columns 94 were oriented with the long dimension fore and aft, and the pontoons 92 with the short dimension vertically. The centerline of the columns 94 were aligned with the center of the respective pontoon. The buoyancy of trusses (not shown) between the columns 94 was ignored. Around the top of the stability columns 94 ran a tight box beam 9o, of the same width as the columns and depth as the deck structure of the "IOLAIR," forming a ring of reserve buoyancy. Though not sufficient to support the entire weiqht of the vessel, this minimum of reserve buoyancy was purposefully chosen to conservatively represent the effect of a buoyant deck without overpowering the contribution of the angular columns. In the final design, the entire deck is to be watertight.
The principal particulars of the baseline vessel of FIGS.
4-6 were adapted from the "IOLAIR" as well. The length of both the pontoons 92 and the main deck 90 (they are flush at each end) became 99.97m (328 feet) and the beam over the main deck 9~ became 47.55m (156 feet). The depth of the vessel was held constant at 30.48m (100 feet~ with the buoyant deck 90 occupying the top 4.88m (16 feet).
From the straight-legged baseline vessel of FIGS. 4-6, the study varied the angularity of the stability columns over the range of 0 to 30 by rotating the columns outboard from the bottom of the buoyant deck 14.63m (84 feet) above the baselineO Thus, the deck width and all other principal dimensions were held constant.
As the stability columns were angled outward, the offsets were adjusted to maintain a constant cross-section perpendicular to the axis of the column. Because the angularity increased the effective width of the column, the inboard offset was reduced keeping that outboard constant. The pontoons were not rotated with the stability columns but they were located further apart to preserve their orientation to the outboard edge of the columns.
A design displacement of 20,000 mt was chosen for the straight-legged baseline vessel resulting in a nominal 15.24m (5û feet) design draft. However, as the columns were angled outward, the displacement increased somewhat. In order to be F-263s(2105) 9 consistent, the design displacement for the wide angled configurations was increased to maintain the design draft.
The vessel's VCG at the design displacement was held to be 13.71m ~45 feet) above the baseline for all configurations studied.
For the other drafts considered, the difference in displacement was attributed to the addition or removal of saltwater ballast. In all cases, the ballast was taken from or added to the volume within the pontoons~ at a VCG of 3.66m (12 feet). Therefore, the vessel's VCG
at each draft considered was calculated and incorporated into the evaluation. The resultant shifts in VCG were large over the range considered and thus important.
The effect of any consumption of stores and/or supplies would be to reduce the topside weight and thus improve the stability. Therefore, alternative loading conditions were not investigated. Consumption of fuel would either be compensated for by adding ballast within the pontoon, which would not change the stability, or by allowing the vessel to rise out of the water, which would be the same as the deballasting situations calculated.

LLFORM
The wide based semi-submersible vessel configurations with stability columns angled 10, 15, 20 and 30, are shown in FIGS. 7-9 and 10, respectively.
The exact angle of the stability columns correspond with the nominal figure for the 30 wide based semi-submersible, however, for the case of the configurations with intermediate angles, the actual angle is slightly different than the nominal. Because the characteristics of vessels with columns closer to the anticipated optimum were of importance, the offsets chosen were selected as more realistic, i.e. even numbers. The resulting column angle was rounded-off to become the nominal angle. In any case the difference is quite small, less than one degree.
The hydrostatics for the vessels with stability column angles of 0, 20 and 30 are presented in Appendix I.

F-26~5 (2105) - 10 INITIAL STABILITY
FIG. 11 presents the initial stability of the wide based semi-submersible vessel. The figure shows the GM along the horizontal axis corresponding to any draft along the vertical axis.
The different curves represent the characteristics of vessels with differing stability column angularity; ranging from 0 to 30.
As can be seen at the design draft of fifty feet, the stability increases rapidly for increasing column angularity from 1.37m (4.5 feet) of GM with 0 to 9.45m (31 feet) with 30.
At lighter draf~s, the stability varies over a greater range. For vessels with less than about 10 column anglllarity, the stability actually diminishes; whereas vessels with greater angularity, the stability increases. In the very light condition before pontoons surface, the straight-legged baseline vessel experiences a negative GM, but the 30 wide based semi-submersible vessel has a GM exceeding 30.48m (100 feet).
`The characteristics are less divergent at drafts deeper than 15.24 (50 feet). Because all the vessel configurations rotated the stability columns about the same point, the bottom of the buoyant deck, their waterplanes become more similar as the vessels ballast down. ~hen the bottom of the buoyant deck is about to be immersed, the only differences in stability are due to the slight variations in ballast onboard giving slightly different VCGs. At these drafts, the GMs are about 4.57 to 5.18 (15 to 17 feet) for all configurations studied.
The GM was calculated using the drawings of FIGS. 4-10 and hydrostatics presented in Appendix I hereof at the 7032m (24 feet) and 25.60m (84 feet) waterlines, the drafts just before the pontoon break the surface and just before the buoyant deck is immersed. At the other drafts calculated, the GM was obtained from the righting arm curves described in the next section for the vessels with column angles of 0, 20 and 30. For the intermediate angles of 10 and 15, the GM was calculated using the drawings and hydrostatics at drafts of 7.62 and 15.24m (24 and 50 feet), and the balance of the curve was obtained by fairing the lines between the cases which were fully calculated.

!, F-2635(~105) FIG. 11 does not present the GM for the conditions with the pontoons exposed or with the buoyant deck immersed. The stability in these situations so far exceeds that in the draft range presen~ed as to make comparison meaningless. However, Appendix II does present the calculations of the righting arms from which the GM may be ascertained in these regions.
The conclusion to be drawn from FIG. 11 is that judicious choice of stability column angularity will produce a wide based semi-submersible vessel with improved GM over the entire operating range of drafts. From this initial study, an angle of from about 10 to about 20 is preferable.

LARGE ANGLE STABILITY
The curves of righting arm (GZ) versus heel angle were calculated for the straight-legged baseline vessel and the wide based semi-submersible vessel configurations with the stability columns angled 20~ and 30. The details of the calculations are presented in Appendix II hereofO The results are presented in FIGS. 12A-12F. To aid the comparison of the different configurations considered, each of FIGS. 12A-12F presents the results for the three vessels at a particular draft. The drafts used vary from 24.1 feet, pontoons almost immersing, to eighty-fou~
~eet, buoyant deck almost awash. Each of FIGS. 12A-12F shows the GZ
along the vertical axis corresponding to the vessel's heel angle along the horizontal axis.
In each case studied, the large angle stability increased with increasing stability column angularity. Additionally, one should note that the maximum righting arm and the area under the curve, righting energy, varied inversely with draft. All configurations possessed greater rîghting energy at shallower draft than when deeply ballasted.
From this portion of the study, one must conclude that any angularity of the stability columns is beneficial, and that the more angular they are, the more benefit derived.
Another important observation to be gleaned from this portion of the study concerns heeling due to wind. Egon P.D.

y~
F-263~2105) - 12 -Bjerregaard, and Svenn Belschov, ~'Wind ûverturning Effect on aSemi-Submersible~, OTC paper 3063, 10th Annual Offshore Technology Conference, Houston, Texas, ~ay 8-11, 197~, presents the wind heel moments and levers for the MSV "IOLAIR" as calculated by the ABS
method. The information given was used to develop approximate wind heel curves for the configurations of this study. The resulting heeling arms are plotted on FIGS. 12A-12F. They reveal that the straight-legged baseline vessel will heel as much as 17~ under a 51.44 m/s (lûû knot) wind when at the design draft of 15.24m (5û feet). However, the wide based semi-submersible vessel configurations studied will heel less than 3 under the same circumstances. The great difference reveals the sensitivity of vessel performance to small differences in GM and configuration, and is attributable to the relationship between the angle of the righting arms and the heeling arms.

u~MAGED STABILITY
The study included a brief review of the damaged stability of the straight-legged baseline vessel and a wide based semi-submersible vessel with stability columns angled 3û. Two conditions were studied. The first, a flooding of one forward stability column between the top of the pontoon and the bottom of the buoyant deck; the second, the same column combined with the first 23.16m (76 feet) of its pontoon. The cases were chosen to represent catastrophic casualties and ignored the greater degree of subdivision actually expected in the final design.
The analysis reveals that for both extents of damage, the wide based semi-submersible vessel retains greater righting energy, and suffers less immersion than the baseline vessel.
For the purpose of this study9 the relative performance of the two configurations considered and not the absolute numbers are important. Because the simplified hullform chosen had only a watertight ring around the main deck instead of a fully buoyant structure, the final measurement of heel and trim are exaggerated.
The final design would have a fully buoyant deck structure. For the purposes of comparison therefore, the following table presents the results of the two conditions studied~

F-2635(2105) - 13 -The details of the damaged stability calculation are presented in Appendix III.

DAMAGE STABILITY RESULTS
Baseline W8SS 3û
Vessel Compartment Column & Co-lumn Flooded Column Pontoon Column Pontoon Heel 18.0~ 21.0 12.2 17.0 Trim (m/ft) 10.36/34.0 15.54/51.0 11.89/39.0 13.87/4505 Draft (m/ft) 17.62/57.8 19.81/65.0 18.41/60.4 20.42/67.0 ~eight of corner above final WL -0.043/-0.14 -5.82/-19.1 0.96/3.16 -3.96/-13.0(m/ft) CONCLUSIONS
The proposed concept of a wide based semi-submersible vessel does produce a vessel with superior characteristics in all areas of stability.
For the vessel size and proportions chosen as a baseline, a preferred angle for the stability column lies between 10 and 20, but supe ior characteristics were shown for angles of the stability columns of greater than O to 30. The exact configuration depends on the desired operational characteristics. A buoyant deck structure is beneficial at large angles of heel and in damaged conditions, and is preferably incorporated in the design.
Although the foregoing description and study were specific to a semi-submersible vessel having an elongated deck and parallel pontoons connected to the deck by stability columns such as shown in fIG. 13, the present invention contemplates any number of stability columns, and angling the stability columns outboard from the deck structure of any of the many semi-submersible vessel configurations such as shown in FIGS. 14-23.
FIG. 14 shows a pentagon arrangement of stability columns 96 and footings 97. Each of FIGS. 13 and 14 also show a drilling rig lûO, 101 and means for propelling the respective vessels 102, F-263s(2105) 103. The present invention contemplates angling the stability columns 96 and footings 97 radially outwardly to improve the stability of the pentagon vessel shown.
Similarly, FIG. 15 shows a delta arrangement of stability columns 104 and footings 105 with such stability columns and footings angled radially outwardly as shown by the dashed lines.
The semi-submersible vessel configurations of FIGS. 16-23 are known as FIG. 16 Ring, FIG. 17 A-Type, FIG. 18 Y-Type9 FIG. 19 V-Type, FIG. 2n Catamaran, FIG. 21 Angle Catamaran, FIG. 22 Trimaran and FIG. 23 Grid.
A semi-submersible vessel constructed in accordance with the present invention is particularly suitable for operation in ice~infested waters. For example with reference to FIG. 3, the vessel is shown on station drilling a subsea borehole with a drilling rig 53 through a conduit or moonpool 55 through the deck 10. ~hen it is desirable to break an outboard ice-mass such as shown at 61, seawater ballast in ballast tanks 66 is pumped overboard by pumps 57, 59 to raise the vessel such that the columns 20 exert an upward bending force on the mass 61 to break it~
Conversely, when it is desirable to break an ice mass below the deck 10 such as the mass shown at 63, ballast is pumped by means of pumps 57, 59 from the surrounding water to ballast tanks 56 to deep ballast or settle the vessel in the water such that the stability columns 20 exert a downward bending force on the mass 63 to break it.
A semi-submersible vessel such as those contemplated by the present invention find use not only in drilling as shown with respect to FIG. 3, but also in producing at offshore sites, and for general utility services at offshore facilities such as a rescue vessel. Thus, it is contemplated that a semi-submersible vessel used for utility purposes may serve as an ice breaker to protect offshore facilities.

~PP~D~X ~

~DRl~STAT~C5 B~ 5 CONFIG~:IRATXON

ii ~15S 20 CONFIG~I~TIO~

~i WESSX 3 0 CO~F~GlJR~q~O~

r-/J

~ F~ s lr~r I C~ S
- E~ L~ I P~E~ E~

D~TE
UNITS AND ~EFINITIONS
~ISPL~CEMENT ~I'-F'L~SE~E;~JT~LqtJ5 TONS) DR~FT HEIGHT AC~nVE ~SELINE~FEET) ~T A~IDSHIF'S
~ HEIGHT OF CENTER OF C~UOYQNCY~FEET) A~OVE C~SELINE
LC~ LONG. CENTEF. qF BUOYANCY~FEET) FF:OM ~MIDSHIF'S (+ FWD) LCF LONG. 5ENTEF~ OF FLOT~TION(FEET) rr.cM ~IDSHIPS (~ FWDi LGNG K~ LONGITUDItN~L ~ET~GENT~IC HEIGHT(FEET? ~OVE C~5ELINE
`~Tl MO~ENT TO CH~NGE TF~I~ ONE INCH~FOOT-TONS9GML=~ML) TPI TON~ fEh INCH IMMERSION
TR~NS ~M T.R~NSVE~SE MET~CENTRIC HEIGHT(FEET) ~C~OVE ~ASELINE
VOLU~E D~SFL~GE~ VOLU~E(CUC~ FEET) WPL~NE ARE~ ~RE~ OF THE WQTEkPL~NE(SQUA~E FEET) VESSEL LENGTH = ~ 9.00 FEET MAXI~UM E~E~M =168.00 FEET
~ESSEL OFFSET FILE N~ME MS~-Al ~ESSEL OFFSET FILE C~'E~TE~ 10./~/8?
T~IM 0.00 FEET W~TER DENSIT~ 35.0 CUEtIC FEETi'TON

O~FT ~'OLUME DISPL~CEMENT LCE' hCt ~F'LQNE ~E~
?0-, 000 47_~ 0 1345'4- 85 ~ O- 000 10. OQ~ .00 ?~. ~99 5~o7~0 1~ .15 , 0.000 11.~9q ~3616.00 .OOl 5~7~ 7 0.000 1~.000 51~4.0~
~O.dOO 5~7~88 1708~a 51 Oo 000 1~ 780 5184~ 00 40.000 6497~56~. ~S 0. 000 14.55~ 5134.00 SO.OOO 701508 ~0044.80 0.000 1~.80? 51:34.00 50.000 75~4Q~ ?15?5. ~4 O. 000 1~ 4~1 5134.00 70~000 805?4S ~3007.08 o,ooo ?? 3.~4 51:34. 00 ~3.~ 8~7818 ~5080~5~ 0.`~00 ~8~1 51~4.
84~ 001 87?847 ?5~8~.35 0.000 6. 88~ ~5~.00 ~k~FT LCF TPI LON~ ~M T~'A~8 l(M MTl .000 0.0005$.~ 52q.4 2~ 17~0,9 ?~3,9~ O,00056._ 444.8 l~S.OO 1780.~
.001 0.0001?,~ 144.9 5~._8 54~9 ~0.~00 O.OQO1~ 138.8 50.9S 54 40.0~0 0.0001~.3 130.. 5 49.6~ 546.
S~.OOO 0.000 1 ~ 1-4.~ 4~.~4 5~6.
~0.000 O.OGO1_.3 ~19.4 4~.7~ 546.9 7~.000 0.0001~.3 115~ 50.71 5~6.
~3.99~ 0.0001~.3 112.7 5~.88 540.9 84.001 0.00056.0 404.8 114.47 4~808 /G

H~l~l~'alST~T ~IC CS
' D~TE ~ 5 UNITS ~C? ~rFINITIONS
QISPL~CEMENT DI!~PL~CE~ENr~L~N~ TONSj D~AFT HEIGHT ~E~OVE C~ASFLIME(FEET) AT ~MI~SHIFS
~ HEIGHT qF CENTE~ OF E~UOYANCY~FEET~ ~O~E C~ASELINE
LCB` LONG~ CENTER OF E~UCYANCY~FEET) FROM AMI~SHIPS (~ FWD) LCF LONG. CENTE~' OF FLOTATION(fEET? FFO~ ~MID~HIFS (-~ FW~) LONG K~ LONGITUDIN~L METACENr~IC HEIGHT~FEET) ~60~E E~ELINE
MTl MO~ENT TO CH~NGE T~IM ONE INOH(FOOT-TONS~GML=C'~L) TPI TO~S PEfi INCH I~MEF~SION
TRANS KM TR~NS~EPSE MET~CENT~IC HEIGHT(FEET~ AC~O~E ~ELINE
VOLUME DISPL~CED VOLUME(CUC~IC FEET) WPL~NE AfiEA A~E~ OF THE W~TERPL~NE(S~UA~E FEET?

~ESSEL LEN~TH = ~.00 FEET ~XIMIJM ~E~M =.1~.00 FEET
~ESSEL QFFSET FILE N~ME MS~-~7 ~'ESSEL OFFSET FILE Ch'E~TED
T~IM 0.00 FEFT WATEfi' aENSITY 35.0 CUC~IG FEET,'TON

D~AFT ~OLUME DISPLACEM~T LCB ~[~ WFL~NE ~'E~
~0.~00 4~ 0 1~494.. ~5 0.000 10.0~0 ~ 16.0~
~3.~9 56~7S0 1619~.~5 0.000 11.~9 ~616.00 ~4.OQ1 566789 161~ 8 G.OOO 1~.090 5521.6Q
3~.000 59~1~ 17140.~8 0.000 1~.8~8 55?1.69 ~0.~0~ 6551~9 18717.~ -0.000 14.$97 55.1.6 50.~00 710~45 ~ 5~59 0.000 17~05~ 5~1.SO
~0.000 7655~ a7~ o. QOO 1~.~8~ 55~1.SO
~0.~0~ 8~077~ ~4S0.7~ OoOOO ~ 5.5~
83.'?~5' 898074 ~?565~?~?8 OnO09 ~)7~49~i 55 l~ a ~4~001 ~8104 S660.1~ 0.0~0 ~7.495 4~ 0.~5 Dl~:~FT LCF TP ~ LONG ~'M TR~NS l'.M ~1Tl ` O. 000 O. 000 56. ~ 5:2~. 4 40~o ~0 17804 23.~51 Q.OOO 5~.'' 444.8 3;~5'.17 17!30.
?4.0Q1 0.000 1;~ 153.5 86.6;~ 5~3~.5 ~;0 . QOO 9. 000 13., L 146. 6 75~. 85 59~. 5 ~. 000 O. 000 1;~. 1 L37. 1 700 5'~ 5S?. 5 50. 000 O. 000 1;~. 1 1;~0. 0 65~o 38 53~ 5 ~0. 000 9. 000 ~ 4q 6 59. ~ 582. 5 70. 000 O. 090 13. 11:20. 6 56.. 49 52. 5 ~3 3 . 9 9 ~ O . O O ~) 1 ~ . I 1 1 6 . 8 5 ~ 7 5 ~ 2 D 5 84.001 0.000 5'.9 40~.4 ~15.6~ 2~50.7 ~7 - H ~ D F~ O S T ~ T I C 5 - 3 O 1~ F
~ 2 DATE
UNITS AND ~EFI~ITION~
~ISFLRCEMENT ~ISF'L~CE~ENT(LQN~ T~NS) ~FT HEIGHT ~C~O~L Cl~SELI~E(FEET) AT ~IDSHI~S
~ HEIG~T OF CENTE~' CF EtlJoyANcy~FEET) AE~OVE ~ASELINE
ic~ LONG~ CENTE~ ~F C~UOYANCY(fEET) FF~I~M AMI~SHIPS ~+ FWD) LCF LONGo CENTEr~ OF FLOTATIQ~(FEET) FF~O~ AMI~SHIFS ~ FW~) LONG KM LONGITUDINAL ~FTACENTF~IC HEIG~T(EEET) A~OVE C~hSELINE
~Tl MQMENT TO CH~NGE T~IM O~E IMcH(FooT-TQNs~GML=ct~L
TPI TON~ PE~ rNCH I~E~SION
T~NS ~ T~SVE~SE METACENT~I5 HEIGHT(F~ET) A~aVE C~ASELINE
VOLU~E DISPL~CED VOLUME~CUCJIC FEET) W~LANE ~'E~ A~EA QF THE WATE~FL~NE(SQIJ~RF FEFT) SSEL LE:NGTH - 328. 00 FEET M~tXIMUM C~EAM -~ 37. 1~ FE~:ET
~'ESSEL OFF5ET fILE NAME MS~-A5 ~ESSEL OFFSET FILE Cr~'E~TED 10/15/8?
T~I~ 0.00 FEET W~TE~ DENSITY 35.0 ~U~IC FEET/TON

~FT V~LUME DISPLACEMENT L~C~ KE~ WFL~NE ARE~
`~.000 ` 4~3~0134~4.85 0.000 10.000 2~16.QO
~3.?99 5$~760 16193.15 0.000 11.9~4 ~616.00 ~4.~Q1 56678~ 1~19~.~9 O.OCO l~oOOO 59~5.36 30~ 000 ~0~69$ 17~1Yo 8~ 0~ 000 12.~3 s9as.36 4~.000 ~62549 18~ 9 0.000 14.~0 5985.36 50,~00 7?~40~ ?0.~40~0~ 0.000 S7.385 59~5.
~O.OQO 78~56 ?~50.1? 0.000 20.. 6~ 5~85.~
'0.000 ~4~110 ?4060.30 0~000 23.443 5985.35 ~3.9~9 ~5899 ?6454- ~7 OoOOO ~ 89 SY85r 36 S~.OOl ~5~31 26455.17 0.000 ~,?91 ?541~o 5?

.
~AFT LCF TPI L~N~ KM T~A~S KM ~TS
~0.~0 0.000 56~2 5~o4 521.~ 1780.
99 0.000 5~.? 444.8 43~.53 1780.~
~4.001 O.QOO 14.? 165.4 115.7~ 631~4 30.000 0.000 14.~ 157,? 103.7~ 6.1.4 ~0.000 0.000 14.2 146.1 877~0 6~1.4 ~0.~00 0.000 14~ 7.g 76.06 6~1.4 ~0.000 0.000 14~? 131.4 67.~0 631.4 70~000 0.000 14.? 12607 ~0.97 6~1~4 ~3~9 0.000 14.2 1~ 55.30 631.4 `q4.001 0.000 60.5 40I.4 lI6.~1 ~508.4 , ~2~

APP13NDIX ~ I

RIG~TING A~ ~JR~IES

BA~;EI.INE CONF~TION

ii W13SS 200 CO~FIG~JRAT~O~

~i WBSS 3 0 CO~F3:OE~RATION

VCG 13ASl~I~ GIJRATIO~

~ Vl:G; 211 C~ F~OElRATIOla vi VCG~ 30 COl!lFIG~R~T~O~

8ASl~INE~ CO~FI~J~TIO~

o?~J ' c~ r~3P~ 5 lr~e~ ~_ ~ T Y
~ESSEL ~E E:~SELINF DATE 11/~/8 UNITS AND DEFINITIONS
~ISPL~CEMENT QISF'LACEMENT(LONÇ TONS) ~R.~FT HEIGHT A~OVE C~ASELINE ~T CENTE~LINE ~MID5HIPS~FEET) ~G HEIGHT OF CENTE~ OF ~r~ ITY ~E~OVE C~SELINE~FEETi LC~ LONG.CENTEfi OF Ctuoy~Ncy(FEET) FROM A~IDSHIF'S(~=F~Q
LCG LONG.POSITIaN ~F CENTER OF G~A~ITY(FEET) F~'OM ~IDS~IIF'S~=FWD~
T~IM TfiIM~FEET)~ AFT) ~A RIGHTING A~M(FEET) OFFSET FILE NA~E MS~-~l D~TE CF~E~TE~ 10~?~8 ~ES~EL LENGTH = 3 '3.00 FEET
WATE~ DENSITY = ~5.00 CU~IC FEET.,'TON
OESIGN CONDITION
Q~AFT ~.000 QISPLACEMENT 15r500000 ~G 54~580 LCG 0.000 HEEL ANGLE R~ DISPL~CEMENTLCE~ D~Afr TRIM ITEF~ATION2 O.dO 000000 15,500.00 -0~000 ~ 971 0.000 0.5' 1.51~3 15,499.~9 0.000 ?~.971 0~000 t 5.0~ 4.~,1 159499.~ -0.0~0 76.009 0.000 lO.OO6.8747 15,499.99 0.000 ~9.761 0.000 ?
lS~O~~.S70~ 15,500.00 0.000 ~.6~1 0.~00 ~O.OQ1?.8780 15,500.00 0.000 37.~87 0.090 ?
?5,0~ .70~9 15t500.00 0.000 4~oO10 O~OOO 3 ~ Q~3.5~5~ 15,500.00 0.000 45.9~ 0.09~ 4 35.0~ ~.31~ 15,500.~0 0.000 4~ .00 40.00 40.~ 9 SOO~ 00 -O. 000 43.~47 0.000 DESIGN C~NDITION
~R~FT _3. 900 ~ISF~L~EMENT l~,QOO.OO
~` 5~,?50 L~G 0.000 HEEL ~GLE ~ ~ISPL~CE~ENTLC~ FT TRIM ITE~FIl~S
0.00 0.0000 15,000.00O.OQO ?3.7120.000 7 0.57 0.7840 .16,00~.0~-0.000 ~.951 OoOOO
5.00 ~.90~ ~6,000.000~00 27~2~4~.000 2 10.00 5.4~1 15,999.99-09 000 30.9760.000 l 5~ O~8~ 1817 15~9S~ 99Oa OOO 34 18470.000 20.00 11.3517 15,999.99-0.000 3~0~ -~
-5.0n 15.I_8~ 15,999.~90.000 43~5 0.000 3 ~0.00 _~.6365 16,000.00-00000 47.0150.000 35.00 35~1556 lb,OOO~OO00000 47a 5~ q Oa OOO
40.00 40.884? 16,000.000.000 4~.1900.000 3 .?/ .

`

DESIGN l:ONDITION 3 D~AFT ~4. 100 DISPL.qCEllFNT lo?. 00.00 ~G 52. 740 LCG 0. 000 HEEL :INGLE R~I~ISPLiqCEllENT LCE~ DF:AFT T~I101ITEFirlTIO~
O. 00 O. 0000 16, 200. QO o. oOQ ?4, 0419. OQO
~,5, ~ 544 1,:~,. OO.QO O.OOg ~4.~37 O. 900 '' 5, 00 ?, 363~ $, ?00.... 00 O. 000:;~7. 7~ 0 O. 000 10. QO 4, 8640 ~ 19~?. 9~ -O. 000 ;~1 1. 463 9. 000 15.00 ~.~148 lS,~00.00 O.000 ~.3;~; O.000 ' ~0.00 10.7715 16,''0~).00 O.0~)0 ;~.38~ O.000 ~. 00 14. 5310 167 1~9. ~Y (). 900 4~. 71 1O. 00 3Q. ~ lS, :;~00.. 00 t). 000 47. 4;~19. OOQ 4 35. ~0 ;;5. ~3~ 00. ~0 0o 000 4~. 045 0.
~iO. 00 40. ~ j 200. 00 9. 000 47.. ~5~7 9. ~00 ;~

DE~I~N ::ONDITION 4 l)h~FT 30. OQO
OIS~L~EIfENT17, 000. 00 ~G 50. ~0 LCl; 9. 000 ~IEEL A~GLE RA [)ISPl.~CE~fENT LCC~ D~AFT T~I11ITE~T . I~N'- O. 00O. 0000 17, 000. 00 -Q. 000 ''~. 442 O. 000 O. 5~O. 0025 17, ~00. 00 --O. 090 _9. 44~ O. 000 5.00 0.4_91 16,~9~.9'? --O.000 ~0.011 0.090 4 10. QO~. 75'66 16,~ 9~9. ~9 O. 000 3:~. 47~ 9. 900 4 IS.OO 5~4965 16,~S;9.~ 0.900 . 37.2R5 0.000 3 ?0, OQa. 60;67 16~ 95~9~ 99 0~ 000 41 a ;~ 0~ 000 ?
?5, 0012 . ;~05 1~ .-, OC~O . 0~? 0 . 000 4 5 . ~56 O . 00() 30.~0 21~0474 17,0~0.0Q ~.O(~ 451~011 ~Q00 4 ;iS~OO 34.~9~1 17,000.00 -O.ûOO 5Q.05'1 0.. 000 3 ~0. Q~39~.801~ 1~, 000. 0~) -O. 000 51. 5~ O. 000 3 Dli AFT 37. 000 DISPL~CE~qENT 18o 000~ 00 I~G 4~. ~70 LCG 0,. 000 HEEL ~NGLE f~A QISPL~CEMENTLC~ DRAFT TF;'IM ITE~TION~
O. dQ 0. QOOO 1~ 000. 00-O, QOO 3b. 194 O. 000 ..
0.57 o.o~a l~QOO.OO0.000 ;~.194 0.000 5. 00 Oo 1;~?7 17,. ~. 5'9-O. 000 36,. 194 O. 000 10.00 Oo773017 t ~9.5'9 -.000 ;~ 341 O.000 4 15. 00 3, ?34517, '?~?. 99 O, 000 400 1 ~1 O. 000 -'0. 00~. ")4:3117~ ?~Q. ~ 0., 000 43" Q5b 0. 000 4 '5,00 Q"~37~$?17,Q~.~5' 0.000 4~10 155' 0.000 4 30 . 0C~. 81~3 " 000 . 00 Q . OOO 50 . ~94 0. 000 4 35~00 3?~4191~OOOoO0 0~000 5~1~i0~ 0~000 3 40. 00 3~. 78~3, 000. 00 O. 000 S6. 529 Oo 000 4 FT 44. 000 l)ISF'L~CE~ENT 1, 000. 00 ~ ~ 4~ ~ 740 L~G 0. 000 ~EEL ~NGLE fi~4 ~ISF'L~CEMENTLCI~ Dfi'AFT Th'I~I ITEfi'~TIq~O
O. 00 O. 0000 1~ 000. 90 O. 000 4:!. 945 O. 000 ?
O.S7 0.0 7~ lS',OOO.OO 0.000 ~S?.'?45 0.000 5-00 0._57~ 8,95'~.. 5`9 O-ûOO 4?~945 0.000 lo- oa o. 5~4 19~ 000. 00 -O, 0OO 4?, 945 o, 000 ~5.~0 1.5740 18,9~ -0.000 4~.777 0.000 4 ?O,oO 4.3235 18,~95~.9'? -0.000 47.04~ 0~,000 4 "5.00 3,? 735 15',000.00 0.000 50.808 0.000 3 3Q.00 13.~554 18,999.99 0.000 5_.7~;S OoOOO ;~
;~S. 00 30. 9:~'?7 1~, 000. 00 O. 900 55. 075 a~ ooo 40- 00 ;~3. 4~7? ~ 000, 00 --O. 000 60. 6;~3 O. 00~ 4 .
~3 Q~SI~N COiY~ITION 7 FT 50. OOO
~ISPL~CEMENT . OpOoo.oo KG 45. OOO
l_CG 08 OQO
HEEL ~NGLE F~ ~ISFL~CEMENT LCC~ DF~AFT T~IM ITE~TIONS
. 00 ~. OQOO ~O, OOO. OO ;). ~O~ 4~,. S~7O~ OO~
4.~ , O~ O~O ~ 7 ~ )oo 5 . O O O . ~ 8 9 4 1 9 ~ 9 .9 '? D .9 Y O ~ O O 04 9 . 6 . 7 O . O O O
10. 00 O. 84?;~ ~O, OOO. OO O. OOO 49. 697O. OOO
~5. OO 1 . 4~ O, OOO. OO O., OOO 49,. ~97O,, O~ 1 ~0. `~0 ~ ~4~9 19, 5'~. 9~ O / OOO 50. ~4~O. QOO
~`5.. OQ 7. 5~75 . O~OOO. OO -O~. 0095~ 4~7 O. OOO
.43:~9 1~ 9 O,.~OO 5~.5~7O.o~Q
3S. OO "8. ~5~ ''O~ OOOc OO -O. OOO 57. SO-'O. OOO
40... 00 30. 'S5~ ~ ~, OOO. OO -O. OOO$4. 1- ~ 0. 090 4 ~ESIGN CONDITION 8 Q~FT 7Q~OOo DI~LA~EME~T23,000.00 ~G 40.'00 LCG O.OOO
HEEL A~GLE ~'~ OISPL~4CEMENT LCEI t)F~AFTTRIM ITEI;'QTIQ~!S
0. OQ 0. 0000 2~ ~9Y,, s~s~ 0. 000 6'?. 9520~ 000 2 0.57 0.1001 ?~?OOOoOO 0.,000 ~9.95 Q 000 5.~)0 O.S819 2~,000.00 O.000 6~.~5.O.000 10. 00 1. ~14~ 2~, ~)00. 00 0~ 000 ~. 9~2O. OQO
tS. 00 ~. 7~7~ ~:;, 00~. 00 Q. 000 6~. 0''~3~., O~Q 4 ` O. 00 S. 4031 ?2, 999. 9~ O. 000 64. 916O. 000 4 _5-00 9.. 60~7 ~2?,Y95'.5"? 0.000 61-545 0,.000 4 3V . 00 17 . 1 3S6 ''~, ?99 . 9~ 0 ,> 000 ~ 5 0 ~ 000 3 35.~0 "O.8`?~ . ?~9.~ ~. QOO 6~.^ 17 0.0~:)0 4 SO.OO ~1.7~17 2',~9'?.99 0.,000 . 7:3,.5'84 0.000 4 - $~

DESIGN ~::8N~ITII:~N ?
DF~tqFT 83 . 900 r)ISPLf~CEM~NT ~'~, ooo. oo ~1;; 38. 400 LCG O o 000 I-IEEL ~NGLE f;:~DISPLÇ~CE1tEt'?T LCEt DF~AFTTF~IM ~TEPATION`
O. 00 0.. 000~ .` 5, 000. 00 0. 0~0 ~ 455 0. ~0 '' O.5'` 0.170~ ~5~000.00 Q.00~ ~3 :~;92 0.000 5. 0~) ~355 ~, 000. 00~. 000 ~0o 73:~ 0. 000 4 10. 004. 13455 ?S~ 000. 00O. 000 77 ~0O. 000 4 lS.00 ~.4~70 - 5, 000900 O.000 74 490O.000 ~û. 0~?10. ;~5 75, 000. O~)O. O :)0 71 . 168 0 1 000 4 ~!5. OQ13. 141~ ~4, ~ 9 O. 0~0 S~ ~65O. 000 4 30.00 15.5~ ?4~ .S~? 9.000 ~8. 4110.000 3 35.OC\1S.717~ ''4,~ O.000 ~4011~0.000 4 40. 0017. 840 24? '~9~ ~9O. 000 81. 79;~ 0 . 000 4 ~)ESIGN ~ON[~ITI~N lq ~I~Af T94 . 100 ~ I SPLACEMENT ~:'5 t ~ . 00 KG :~8 . 1 S~O
O.QOO
HEEL Al`~GLE RA DISPL~CEMENT LCB D~'~FTTF~IM ITEPf~TIqNS
0.00 0.00~)0 ;~5,200.00 O.t)~)O ~. 1779.0~)0 O.~:~ Oo44~0 :;~5,~0~oOt~ Q.0~0 3;~ O.0~)0 5.QO ~.~40;~ ?5"200.00 0.000 ~3103''0 0.000 4 10,. 00 5. 17S9 ~5; ~OQ. ~0 0. 0~0 ~ 4~ ~. 000 4 15'.00 .'~8409 25,:;~00.00 9.000 75.0800.000 ?0,00 10.7137 25,1~'?.9~ 0.000 71.7590.000 4 ?S. 00 13. 3~0~ 25, 19~. 9$~ O. 000 69. 05'5 O. 000 4 ;~0. 00 15. ~7~ ~5, 19~ 5' O. OûO 69. 470O. 000 ;~
3S.OO lb.371~ 5915~.9q 0.000 75.0550.000 4 40. ~0 16. 9045 .~5, 1S~ 0. 000 ~ 88 0. 000 4 ";~

~z~

i~ WBSS 20 CO~FIG~JRATIO~

.
~G

o~r~ I C 5 T ~E~ I L_ I T
'~ES~EL NAME ?ODEG WIDE D~TE 11/10/8 UNITS AND DEFINITIONS
DIS~L~CEI~ENT DISPL~CE~ENT(LONG TONS) ~R.4FT ~EIGHT AE~O~E C~ASELINE ~T CENTE~LINE A~DSHIPStFEET) K~ HEIGHT OF CENTEF~ OF G~'AVITY AC~O~E E~ASELI~E~FEET) LC~ LON5.SENTEF' OF E~UOrANCr~FEET) FRO~ AMIDSHIFSS~=FWD) LCG LON~F~SITION OF CENTE~ OF Gfi~ITY(FEET) f~O~sHIFs(+=~l~n~
T~IM T~I~tFEET)~+= AFT) ~IGHTING A~(FEET) ~FF8ET FILE NAME M8V-A7 ~TE CF~E~TE~
t~lEs~EL LE~GTH = ~_8.0Q FEET
W~rE~ DENSITY - 35.00 CUC~IC FEET/TON
DESIG~ CONDITION
DF~FT ~3. OOO
DISPLACE~ENT lS,OOO.OO
55.110 LC~ 0. 000 HEEL ~NGLE ~A DISF'L~CE~ENT LC~ Dfi'~FT T~ITE~AT~n~ls O.OO O.OOO 14,99~.9~ O.OQO. ~2.~0 0.009 5 0.57 3.09` 15,000.QO OoOOO .~.230 O.OOO
5.00 11l8~1 15,00Q.00 O.OOO 25~98? O.OOO
10~00 18.75~ 14,~9~ OoOOO 31.~52 Q~OOO
lS.OO-` 5. 179 147 999. 99O. OOO ;~. 4:~1 O. OOO ?
?¢.QO ;;1.351 14~ Yo5~ 0.000 4~. 190 0.090 3 ~5. oo37, 4~? 15, 000~ 00O. 000 4~. 450 9. 09Q S
30. 0050. $~6 1.5, 000. 000. 000 51. 2'66 O. OG(: 4 ~5.00 5~c157 14,~99.5'~ 0.000 47.519 0.000 :). 0050. S24 14~ ~99~ 5~90~ 000 ~a. 708 O. 000 4 DESIGN COt~t~ITI :lN 2 Fl' ?3. 900 O~S~L~CE~ NT 16,000.00 KG 5;~. 7`~0 LCG o . 900 ~IEEL ~qNGLE~1~ DIS~LACEMEI`ITLCE~ ~)hftFT TF; I~t ITE~TI ~ S9 00 0 R 000 1 61 t . 900 . 009 2:~ . 71 2 0 . 00~
O. 57 1. 49;~ L5, 9~. s~9-O. 000 24~ oa~ on ooo 5. 00 7. 57~ , 000. 00 -a. ooo 28n 3~9 0~ 000 2 10.00 1~.8~7 l~,OOO.OO -o.ooo ;~3.48'? o,:
15~ 00 19~8 ~8 167 000~ 00~0 >000 38~ 865 O~ 000 ~0~00 25~555 15~S~9S~ 000 44~1~47 O~000 r~
~5~00 ;~ 44 l~OOO~C~O o~o~ao 50~7~0 Q~OOO 4 30. 00 47~ 899 1~ 000~ CO~~)~ 0~0 5;~ ~S47 O~ 0~)0 4 35.dO 5701~0 1~,000.00 0.000 5?.471 ~ 00 ;3 4~0~ 52~746 15,5'1?~.5'9~a.ooo 44.8~9 0.000 5 ~ESIGN G~NDITI~N 3 Q~FT ?4. 100 ~IS~L~CEMENT 16?~00.00 L~G 5~50 LGG 0.000 HEEI_ ANGLE ~A DISPL~CE~E~T LCE3 DF~nFT T~IM ITE~TI~
0~00 OOQOO1$~1~9.~9 ~0.000 ~4.0~ 0.000 ~. 5 ~-` Q. 7~l ^i, ~Q0. 00 Q. 0~:)0 ~4. `S-:i7 O. ~OQ '' 5. ;~10~. ~10316, 1';\9. 99 --0.. 000 ''8. l38 0. 000 ?
O.00 13.04416r:~00.00 0.000 3;~.~68 ().000 ?
15. 00 l~ 0~lb, ~00. 00-0. 000 ~ S;!; 0. 000 ~0. 00 ~. 57~00. 00 -0 1 000 45. 1:33 Q. oQa ~5.00 31.10116,~00,.00--0.000 51.'~?1 0.000 30. ~047. 4S~51 ~, 200. Og -0.. 000 !~i4. 0~ 0. 000 4 35.005~.08116, 00.00 0.900 53.4~ 9.qO0 `~
4Q . 00 53 . 86l 6 r 199 . 9'~ -O . 000 4 ~ . 414 0 . 000 5 DES'GN CON~ITION 4 ~'AFT ~0~000 QI~LA~EHENT 17~10Q,OO
~G 51.080 LC~ O.OQO
HEEL ANGLE ~A DISF'LAGEMENT LCB D~FT T~ ITE~TIaN~
0.00 0.00017,100~00 0~000 ~9.743 ~.000 0.57 O.. ?S~Q 17,0~ 9 0.000 ~ .747 O.00Q ~
5. 00 3. 5q~?17, 0990 ~0. 000 ~ 3'-' O. Q~)0 4 lO~00 ~4~6417~100.00 Q.000 3~.lSS 0.OOQ ?
15 ~ ~C\O1 5 ~ 05417 ~; 00 ~ 00 0 ~ 000 4 1 ~ 55~ 0 r 000 ~0~ 00 ~q~ 48117~. 100~ 00O~ 900 47~ 350 O~ 000 2 ~5.00 ~.8~41?~100.00 OeOOO 5~ 4 0~000 4 ~0~ ~0 45~ S0717~ 100~ 000~.000 55~ 970 5~ Ql~)O 4 35.0Q 55.53_17110~.00 0.000 57~617 0.000 3 ~O~OQ 55.3071'~100.09 0~000 5~.126 ~.0~0 II-lO

O~g ~ZS~B~

DE8IGN COND~TII~N 5 I~F; AFl' ~;7. 000 ISPLÇ~I~EME~:NT 18 ~ t 50 . 00 ~G 48. 8_0 LCG 0. 000 t~EEL ANGLE I~ADI8F'L~CE?1ENT LC~ D~ FT TRIM ITE~'ATIONC
i? ~ 0 ;~ 0 ~ O O Q t 8 ~ J Q ~ Q 0 0 a O 0 t') ~ f) 0 0 O. 57 O, ?SO ' 18~ 150~ 00~~ Q00 ;~i6~ 4()~~ 0~ Q00 5~ 0~) ~u _00 18~ 14S~ 9--0~ 000 3`~631 0~ 000 ~
10.00 5.904 18rl49. i'90.000 .~Y.ll~ Q.00 4 15.00 ~1.09~ 189 14~.5'9-0.000 44O"0~ 0.~)9~) 4 )0 1~ ~57 187 14S~0~ 000 ~9~ 9~7 - Q ~
~5~ OQ ~ 4~ 8!~4 1~3? l5Ci~ 0~0 ~0~ Q90 55~ 2~ç; ~)~ 000 4 30. 00 4:~;. 018 l~, 150. 00 -Q~ 000 53. I-'~ 0. 000 3 ~5~ 00 51~ 704 18~ 150~ 000~ 000 6?~ ~7 0 0~ 051Q
40~1)0 5~ \14 1~ l50u900~000 6~4~1 0~;)00 5 t)ESIGN CONDITION S
~)~AFT 44 ~)Q
1~ ISPLAI::EMENT 1~, ''Q0 . 00 ~G 4~. aoo LCG 0 . 000 lEEL ~NGLE F;~q DISPLACEME~NT LCEI DP';AFT T~IM ITEl;:i~TI~?`!S
0~ O.000 ~ ?,00.00 O.000 4;~.055 O.00~ ~
O- 5~ O- ~ ?`00, 00 o. 000 43, o5~ o, ooo ?
5. 0~) 1.9~7 19, 200. 00 0. 000 4~ 30 0. 000 lO. 00 ;~ 4~ 0~ 000 4~ 0~ (~00 15. 00 7. 80:~ 1577 15\9. 9~ O. 47. 4_8 O. 000 4 O~ 00 1_~ 619 19~ 19~ 0~ 000 5'~ ~25~ 0~ 000 4 ?5 . OQ ~ 4~ . 51S' --O . 000 57 ~ ~ ~ 7 O . 000 4 3~) ~ 00 40 ~ 0701 9 ~ ~ 00 ~1 ~?0 0 ~ 000 ~iO ~ ~74~ 0 ~ 00 35~ 00 46r662 15~ ~00~ 00 G. 000 66. 371 O. 000 4 ~0~00 4~)~83;7 15!, '00.00 0~000 75~0~5 0~000 5 Il:-ll Q~FT 50.000 D~5FLRCE~ENT _O,X50~00 ~G 45~000 LCG O.OOO
HEEL ~N~LE RADISPL~OLMENT LCC~ D~FT TRIM ITEF~TIq~' ~O O.OOO ~Oy~5Q~0 0.990 4~.7~9 9.000 9. 1~5?0~ ?50~ 00 ~~)n 0~)0 ~ 4~71~ 71;~; Q~ 0 5~ 00 1~ 71~ 501~ 00 O~ 00~ 4~ S29 ()~ 000 ~) 10~00 3~5~09;~!~;0~,00 0.001) 50~55~7 0~OOO ?
15 . 00 5. 5;;~!?0? ~49~ 951 0~ 000 51~ 7/5~3 0~ ~!00 4 '~O.OU 9-605 _0~ 0-00 9-000 5~S.15'~3 0-000 4 ~5.00 `1.087 ~,~50.00 0.009 59._?1 0.099 }
30.00 ~ 73 ?0,_49.~9 -O.OOO 62.35~ 0.090 35. 00 41. 77?~0, ~ 50. 00 0, 000 ~9.942 O.Q90 4 ~iit, 00 4~. 165'~O, "~;0. 00 O. 000 75~7 ~!9~ O. 000 5 ~ 70.00Q
DISPL~CEMENT ~,450.00 ~'C~ 40.500 I C~ 0. 000 ~EL ~N''LE R~DISPL~CEMENT LC~ D~FT T~I~ ,ITE~TIDN~
~Q~ -O.OOO 2~,450.00 ~.OOO 6~.~94 O.OOO
0.57 0.~59 _~,45~.00 o~goa ~.9Y7 O.OOO
5. t~0 1~ ~05 ~.~7~ 450. 00 O. OOQ 70. 1~ O. OOO
~00 .. 887 ~ 4~;0.0~ 0.00~) 70.7~5 0.000 4 ` 15~00 6.0al ~,450.00 0.. 000 ~.085' 0.000 4''0.;)~ ~0.4~ ,450.00 0.000 66.~ ~ O.(~ûO :~
''S. ûO 19. 8~02~.44~. ~9 O. 000 65~ ~S~ 0. 0~0 4 30. 00 ~ 351 ~3" 44~ (3. 000 'oO 1 ~; o, ooo 35 . ûO ''~ ~ ~79~ 445' ,. 99 0 . 000 ~9., 07~ 0 . 000 4 40. 00 :~. 5~'3, ~490 9~ O. 000 9~. a~ o. ooo 4 3a DES~ CONDITION
DF;-~FT fl3. 909 ~)ISPLACE~ NT ~ 5~ ~;OQ. OO
KG 38 . 100 LCG O . aoo HEEL i~NGLE F~ ISPLP,CEMENT LCEIDI~QFT Tli~IlS ITEFii~TIQNS
0. 00 O.. 000 ~5~ ~00. 00 O. 090 ~ . 6~ ; O. 000 ~
O. ~ 19 ~5~ ~00. QO ;). 0!)083., 485 O. ~00 35, oo?, ~4;7 ;~57 i~OO- 00 O. 000O. 9~? O. 000 4 10. 005. 7;3~ :~!5, 600. 00 O. 0007~3. 103 O. 000 415.00 5~ 18 ~;y59S~.9S~ O.90075.~49 0.000 '~O.0013.574 ')5rS99.~9 O.. 000 7~ 3~ 0IC90 5 . O O1 ~ . ~ O _ 5 ~ S ' j) s' . 9 9O . O O O 7 1 . 7 9 5 O . O O ~ 4 30. 00~O.~Q~ ~Sr5~99 O.OOO7 7 7 ~85 0.OOO 435, OO?". 059 ~5~ 55~9- 5~9 O, 0008~. 39~? O.. OOO 4 40.O~.711 . 5~5~ O1,O~O97.157 O.. OOO 4 I~E8I~N CONDITION 19 ~Fl- ~ )0 I~ISF!i~ EMENT ~S~000.QO
I~C 37 . ?QO
LC~ 0. 000 }IEEL ANi~LE ~ Dl ~;F`L~4CEI~ENT LCCt l~ qFT TF~ l ITEFi'!~TIQN8 0.000.000 26,000.00 0.00084.490 0~009 ?
0.570.68S 2~9090.l00 0.0~084.449 ~.OOQ 3 5.003.~91 ?6,000.00 0.00~~.005 O.Q00 4 10~006.307 ~h~OOO.OO 0.00075~.186 0.000 4 lS . ~0~? . 994 26 ~ 000 . 00 0 . 000 7~S . 4 ~ 1 0 . 000 4 ~0.0014.0~i1 ?5r9~,9~? 0.0007~,~78 0~000 4 ?5,0017.5?0 25r5~Y~?.'i'~ 0~0007~3.566 0.000 30.0019.~42 ?5~ .9~ 0,0007~,~?5 O~OOQ 4 35.00~0.983 ? 5~9~ 0.000~7.~4 0.000 4 ~0.0021.51? ~5~9~9.9~ 0.0009~650 0.000 4 3l - ~2~

il~ WB5S 3 0 CO~FIGtl~A~eI0 , 3~

P~S~ ~ G ~ T ~ ~ L_ X
~'EG~EL N~ME ~ODEG~.X~C: WID DATE ~1/10,'~
UNITS ~ND DEFINITICNS
DISF`LACEMENT DISF'L~CE~ENT;L~NG TONS~
D~AFT HEIGHT ~C~OVE ~SELINE ~T OENTE~LINE ~IDSHIPS~'FEET~
~G HEIG~T OF CENTE~ OF GF:AVITY AC~O~E C~ASELI~E(FEET) LCC~ LONG.CENTER OF CtUOY~NCY(FEET) FRO~ AMI~SHIF'S(~=FWD~
LCG LONG.POSITION QF CENTER OF G~ITY~FEET~ FfiOM ~ID~HIF~S(+=FWD~
T~I~ T~IM~FEET)~ FT) ~IG~TING ~M~FEET) OFFSET FILE NA~E ~S~J-~5 ~TE CfiEATED 10/15~37 ~ESSEL L~NGT~ ~ 3_~.00 FEET
~TE~ DENSITY 35.00 CU~Ir FEET~TON
OE~ICN CON~ITrON
D~AFT ~.OOO
DIS~LACEMENT 15,500.00 ~G 5~ 0 LCG 0.000 ~EEL ~NGLE RA DISPL~CE~ENTL5C~ D~'~FT T~I~ ITEF'~TI8~C
0.00 0.000 15,49~.~9-0.000 ~ 0~000 2 O.57 3.5~?0 15, 49~ , 000 ?~). 990 O. 000 3 5.00 1~ 4 15,500.000~000 ~7.75~ 0.000 7 10.00 23~140 157500.000.000 3~.4~7 0.000 ?
lS.O~ 31.~0~ 1594~ g.OOO ~.6~ 0.000 ~0.~0 3~ ,500~00-0.000 4~.3~9 0.000 3 ~5.~)0 48.5~1 15,500~000.000 53.0~ 0 000 5 30.00 ~.2~ 159500.000.000 54.~3~ 0.009 4 35.~ S2.~15 15,4q~.~9OoOOO ~8.001 0.000 4 40.00 5~.858 15,4~ 90.000 39.`~11 0.000 4 DESIG~ CONDITION
D~FT ~.900 QISPL~CE~ENT 1~, 0009 00 ~ 54.4~0 LCG 0.000 HEEL ~NGLE ~'~ DISPL~CEMENTLCB DF~FT Tr~IM ITE~ATIqNS
0.0~ 0~000 16~000.0Q0.00~ ~.7$2 0.000 0.57 2.018 1~,000.00o.ooo ?4, 146 0-000 5.00 11.~58 15~9~ 0.000 2~.950 0.000 2 10.00 20.44~ 15,~9~.~9-0.000 ~4.702 0.000 15.00 ~8.6~4 16,000.00~.000 ~0.877 0.00 20.0Q 36.077 157 ~9~9 ~Oa OOO 470 5~5 O~ 000 ~5.00 46.182 16,000.000.000 54.L54 OJ 000 5 30.00 5~.46~ I5~99.4~0,000 559674 0~000 4 35.00 63.~61 ~5,~9.~ 9 50- 395 ~
40~00 589 146 16,000.00OO.OO~ 4~06~ 0~000 5 ~3 DESIÇ;N CONDITION 3 DF~FT 4A 100 DISPL~CEMENT 16~ ~!QO. 00 KG 5;~. 960 LCG 0. 000 I~EEL AN~LE ~ ISPLACEllENT LC~ f~FT T~IM ITE:F;ATIO~r.
O . 00 ~ ?Q~ O . 09 Q . 000 ~'4 . ~0 0 ~Q~?
0.5;; 1. ~s16~199. 99 O.QOO ~4~.619 0.000 5. 0010. 353 1~0~). 00 0. ~00 2q. 428O. !)00 '' 10. 0/)1~. 410 1~ O. 000 35. 184o. ooo ?
lS. OO~. 4~37 16~?o 5~S~ O~ OOÇ~ 41~ 3~630~ 09Q ~
?0, Oq~4. ~5'~ 00. 9C~ 0.. 0~)0 4~. 075 O. 000 3 ~5~ OQ '4~!i., ?~ . 00. QQ 0~ 00054~ 5~S 0~ OO~t 5 30~06~ 9~ 16~ ;~00~010 O~000 56~199Q~000 3 3~.0~.''53 ~ 0.000 ~1~.437 ~100~ 4 ~0. 00SS. ~?9 16, 19~ ? O. 009 43. ~ ~36O. 000 5 I~E~i I GN CONt~ I T I ON 4 21;~Fl;~0. 000 DISPI:.~CEMENT 17, 309. OC
t~G .51.~ 0 LCG 0. 000 I~EEL ANGLE li~ l)ISPLAC:EMENT l CE~ DF~FT Tl;'I?~lITEF~ TIONS
0. 00 ~0. 000 17~ 9~ O. 000 ~0. 468:). 000 2 O . S7 0 . 5 1 ~ 29~ ~0 ~ OQ~ 30 . 47;~0 . QOQ
5. t)~ 5. 789 1;~ ~99. ~ O. 000 :~.. . 1;i8 O. 09Q 6 10. 00 14. 168 17~ ?S~9. ~?~ O. 000 ~7. 8~5O. 000 7 1 5 . 00~ 1 . 7 15 1 ~ . 9`'? -O ~ 00~) $4. 0370 . 000 :;!0. 00. ~3. S3~ 17~ '~99. 99 O. 000 50. 771O. 0~)0 :~
~5 . 00 40 . 7~ 300 . 00 ~ 000 5~ 77 O. 000 4 30 . 00 60 .. 37.~ I.7 ~ 3~)Q . 00 0 . 0005~ . 04? O, 000 ~;
~5~00 ~ci.013 17~007QO 0.00~:) S~ i7 0.950 3 40.00 60.9.54 17~. 99.9~7 0.000 51.761 0,.000 5 ~ .
, 3y 3f; ~FT 37. 90Q
DISPL~CEP~ENT 18, 400. 00 KG 480 ~50 LCG 0. 000 I~EEL ANGLE ~A DISF`L~ ;EPiENT LCE~ DF~f~FT Tl;'I~l ITEFiATIC'N'`"
~. 00 -O~ OC~ 18, 400.. 00 O. 000 3.~. ~9~ O. 000 '' Q. S~ . 1;3, ~0~. 00 -g. 000 ~ 0~ O. 000 '' 5. 00 ~ . 808 la, 3~.. 99 O. 01}037., ~0~ O. 000 10. Ot~ 18, 399. 99-O. 000 400 707 O. 000 4 15.00 1~.6~ I81,35~ 9 -9~000 46.7~5 O.000 3 . 0~ ~3. 1~7 18, 400. 00O. 900 5;~. 4~7~. 000 -' ~5.00 37.117 1~,400.00 0.000 5~ S2 OoOOO 4 3C. or~ 5~ o 7~ , 400 . 00O . 000 ~ 1 .. 3 1 ~ O . 000 35.00 b~ 407 18p400.00 0.000 ~6.877 0.000 4 40. ~)0 ~1. 3~ 13, 4000 00 O. 000 7~.... 403 O. ~00 5 OE:SIGN CONDITION
~AFT 4'4. 000 DIS~L~CE~tENT 1~, 500. 90 KG 4~ . f3b Q
` LCG 0. 000 ~EEL ~NGLE F; A DISPLACEMENTLCI~t D~FT TF~I~ ITEl;~rION'`O. 00 -O. 000 15~, 500.00O. 00~ 43 3 O. 000 O. 5 ~' O. 3~7 1~?~ 4~ O. 000 43. 338 O. 090 ~' 5.00 3.~?~ 19~499.99 00000 43.7:~0 0.000 .
IQ . QO o . 559 19~ 49S~. 99 O, Q :)044. 90b O . 000 4 15 . 00 1:~ . 3bO 19 ~ 4q9 . 9~ -O c 09049 . 795~ 0 . 000 4 :;~0 . 00 1 8 . 488 1 ~ ~ 500 . 00 0 .. 00~ 56 . ;~ 1 0 . 000 ''5.00 34.~37 15',500.00 0.000 ~0154/j~ 0.000 4 30~Q~ 5:;~.5~3 ~500.00 0,00() 64.. 5~ 0.~00 ;~i 35. :)0 56.438 15~aOOI.OO0~000 7 ~76 0.000 5 40.00 56.157 1~50t).00 0.000 81,.7-?8 0.000 .. . . . .
~S

DES I 5~! COND I T I ON 7 Dl; ~FT 50. 000 DISPLRCE?1ENT?0, 600. 00 I~G 45. 000 LC~ 0. 00~
IIEEL ANGLE~ ~ADISPL~CE~lENT LC~ DF'AFT T~rMITEF~QTI3~' O. 00 O. 000_Q, 600. 00 Oo OQQ 49. 7.~5O. 000 '' 0.57 0~31;~_O,SOO.OO --Q.OOO 4~.770 O~OOV
5, oo ?. 749?0 ~ 600. 000. 000 ~;0. 1~6~ 100 ?
10. 00 5. 5~6~0, 595'. 99O. 000 51 . 71O. 000 5. 00 9 1 001 ?0~ 5~9. 9~ Oo 00053. ~7~3Oo 000 4 ` ~). 00 15. ~`O, 600. Qg o. ooo 5e?. 14~Q. 000 4 ~5 . 00 ~0 ~ 59~ o ~S~ 0 . ~00 62. 37~o . ooQ 4 30. 0;) ~7. 7S7~ 00. 00 O. 000 S7. 16:~0. 000 4 -~5. 00 5Q. s4a_0, ~00. 00 0. 000 7~ O. QOO 5 40 . 00 50 . 580 ?0 " 600 . 00 0, 000 87. 0750 . 000 5 QES I GN CONI~ I T I ON 8 QF;:AFT 70~, 000 C) ISPLACEHENT ~4 9 OOQ . 00 ~G 40. 330 LCG 0. 000 HEEL AI~GLE ~AQISPLf~CE~ENT LCB DR~FT TF~ trTE~TIClt`~
)() O. 000 ?4~ 000~ 00 O- 000 6~. 647~).000 ?
0.57 O. 0~ 24,000.00 O.OûO ~.651 O.QOO
5. oo 1 . 8~8 ~ 9 o. ooo 6?. ~7 -1~ . 00 ;~. ~52 :~4, 000 . 00 0 . 0007(). 90 10 . 000 4 15. 00 7. 8~9 ~4, 000. 00 0. 000 S~. ~18 ~ 00 4 ~0. 00 13. 7~:~ _49 QOO / 00 O. 000c~7. 6~3~O. C\OQ ;~
~'5.00 .`5.944 4,000.00 0.000 ~~.7_1 0.000 4 3 )~ Q0 3_. 5~ 9 0. 000 75. 8600. 000 4 35. 00 ~4. 506 :~:3, 9`'?9. 99 0. 000 8~. ?75 O, 000 4 40. 0~ 75. 177 . , 999. 99 0. 000 9~. 7160. 000 .5 II~18 DESIG~ CONDITION 9 D~AFT B3~900 ~ISF~LACEMENT ?$~oO~oo ~'G 37.950 LCG 0.000 ~EEL ANGLE ~ADISF;LACEMENT LC~ D~AFT T~IM ITE~:ATIO~-o.ao o.ooo 2~19 1~i~9~ n000 ~12351 ~ O~000 0~ 57 0~ 3 ?6, l?q.~9 0~000 8?. 515 9~ 090 5 ~ 00 ~ 5;; ~6 ~ ~200 ~ 00 0 ~ 000 80 ~ 5~ L 0 ~ 000 lO.OO ~ 269~00.0~ 0.000 77.Yl~ 0.000 4 ~5~ 00 l~o 55~ ~? 1~9.~ O.QOO 7S.4~ 0.000 4 ~ 00 16~ ~00 S~ 9S~ O~ 000 7;~ ~55 ~ 000 4 _5~ 00 ~ B7~ 26~ $1 0~ 000 74~ 601 On QOO 4 30~ 00 ?:t, 81"'~6, 19~?. 99 O. 009 i32. 70 ' O. 0~)0 4 35~ 00 ~S~ ;~i;J426~ 199~ ~9 O~ 000 ''?3. 0~?5 9~ 000 4 40-00 `7.06 6,~9.~9 0.000 105. 44? O, ooO 4 OESrGN CONDrTION 10 O~FT 84.100 DrS~LACE~E~T ~6,~00.00 ~G 3~.460 LCG ` O. OQO
HEEL ANGLE ~ADISPLACE~ENT LCB D~AFT T~I~ ITE~ArIONS
0.00 -0.00026~700~00 0,000 ~4~8 0.000 ?
Q.5~ 0.60~~6,700~00 0.000 84._?B 0~000 S.OO ~.~96~,700.00 0.000 ~ 15 0.000 4 10. 00 6 6, 700. 00 0. 000 79. 180 0. 009 4 15.00 11.16.0~6,700.00 0.000 7~.7~0 0~000 . 3 ?0,00 16. 3;~776,69$~.9''? 0.000 74.775 09000 4 ?5.00 ?0.78~26,65~q5~ 0.000 76.44ti 0~000 4 ;~0. 00 ;~3. 25'~12~, 6'?q. S~90. 0~)0 84. 447 0. 00() 4 35. 00 ~4. 774~6, 65"?, ~`;)O . 000 ~4. ~88 0 . ~)00 6 40.00 ~5~46826"6q~ 9 ~.U00 .107.051 0.000 4 II l9 ~3,7 5[3.~
i~ V'C:G B~;l:I,IN~ ~ON~IG~JRATION

Ye~ 8 45 ' ~ i!0, 000 LT DESIG~ DI5PLACE~T

E~SPodB~I,ASTdBA~h ~Ol!qTOTAI, PIO~[ RG
~! I,T f t-I,T f t l.T f t 25G00saoc 60000 96G000 3~.40 230093000 31;00û 936000 40O70 2000Q ~ o 90000o ~5,~0 19~00~1000 ~ 00 8880~0 4~;o74 18000-200û 2a.000 876300 ~80 67 1700q-3~00 -31;~1D Q640~ 5~82 ~6~ao-3~00 -45000 85~.400 52.74 l~iOOO-~000 -4~000 8520U0 53025 15500-~500û -5~000 84~0 54.58 I~20 ~6~

Z5~
9 VCG 20 COi!aF~ RAT~ON
.

~CG ~ 45 ' @ 20,250 ~T DES~GN DISPI~ACE~2ENT

DIS~,.dl3Al.I.AST dl3A~ TOTAr. IgOM ~G
LT l.T ~ t-~r,T f t-r,T f t
2~i0005750 ~sono 9~0250 37~70 25~5351~ 64200 975~5~ 38.10 23~503200 3~400 949~SS0 40.50 21i250 ~ 0 9112~50 d,5.>û0 lg200-1050 -126~0 8986~0 4~i.80 181~i0~21~0 -~52C10 ~86~5û ~8. ~2 31~t~ 37800 8734~0 Sl.~8 16200-4050 4~600 862650 53.2~;
16000-425tl ~ 0~ 8~iU250 53.76 15500-~7S0 ~s7aoo ~5~259 55.1 ,
3~

` " ~2~
- v~ VCG 3 0 CONFIG~JRATION

~ G ~: 45 ~ ~ 20, oao ~T DISSIGN DISPr.~CEMBNT

DISP. dB~I5~;~ dBAI,L ~O~I T0T~ PtO~ RG
LT r,~f t--~T ~ t--~T
26700 610~73:200 1000;!~a~ 37 . 46 262t~0 560067;2~ 99~01~ 37.95 24000 34U04~00 g6780~3 ~0.33 20600 00 92701~ ~S~r00 1951~1~ ollOO-13200 913~100 ~6~8 18400 -2201126'1~1 9~ 10 dd8.95 17300 -33 00-396~ 88740~1 5~ !g 1~2~ -44~528110 ~7421:10 S3.96 l~iOûO -~61~;200 ~71800 54.49 15500 ~1011~12~0 865800 55.86 ~O

APPE~DIX III

D~5~GE5) ST~

ASE~INE CONF~G~RAT:Ct:)~

iii WB~S 3 0 t:ONFIG~lRATIO~

III-l ~/ .

EL t`l~E C~S~LINE DATE
~P~2ED COt~DITI~N
DR ~- r so.oo FEET
CI~FL~CE~ENT .O~OQOOOO TONS
'~_;2 45.00 FEETt~c~ E C~SELINE!
LCG O.OQ FEET(~= FWD QMI~SHIFS~
D~MAGED CO~PA~T~ENTS
I~ NO. CUMP~F~T~ENT FE~MEAC~ILITY T~N~ OUTFLOW D~T~
FILL DEFrH DENSITY Fr~EE sur~r~cE
(FEET) (FT~TQN.l (FT-TO~
1 COLUMN 1-S 1~00 24.9035000 Q.O
3 ~ONTOON 1-S 1.00 0~0035.00 Q.Q
~AM~GE~ SHIP ~OFE~TIES ~FTER OUTFLOW
DISFL~CE~ENT - 19r999~90 TONS LCG = ~0.00 FEET
~CG = 45.00 FEET
TCG = ~0.09 FEET
TF~NS~EF~SE ~ET~CENTE~ (~E~O DEG~EES) = 78.55 FEET
METnCE~T~IC HEIGHT UFRIGHT (ZEF~O DE~EES) = ~.55 FEET
HEEL ~N~E PI~HTING ~ DISPL~CE~ENT LCE~ DF~FT T~I~ ITE~TIO~' 0.000 ~~005 4 1~,9~9.90 3~.55 S5.14~55.~ ~6 10.00Q ~5.754 1~,999-90 5~ ~4 6~. ?~ , 7~ 11 ~0.000 ~0.495 19,999.?0 5.55 64.~9~5~o4~ 7 ~0.000 ~.749 19t?~.90 4~18 6~.10-4b.01 1~
~0.000 14~49 19~9~ 0 4~07 7~055 -5~ 10 III-Z

~?

-. c~P~
`~'E~`SEI N~E ~ASEI_INE Dt~TE
~vlESSEL OFFSET FILE N~ME MSV-~l ~nM~rl ~G~F'A~;t~ENT FILE ~S~-Dl G~ CQN~ITION
~FT 50.00 FEET
QISPL~CE~ENT ?0 ~ 000 ~ 00 TONS
~CG 45000 FEET(A~O(JE C~SELINE) LCG O.OO FEET(~= F~D AMIDSHIPS) D~MAGE~ CO~F'~T~ENTS
I~ NO. CO~F'A~'T~ENT PEkME~ILITY T~NK OUTFLOW DATA
FILL ~EPTH DENSITY FF`EE SU~F~I_c ~FEET) ~FTY~TaN~ ~FT-TO~Si I COLU~N l-S ~.OO ~4~00.5.00 O,O
D~M~GE~ SHIF' F~OPERTIES AFTE~ OUTFLO~
~ISFL~E~ENT = 1~ 7 TqNS LCG - -O.OO FEET
VCG = 45.00 FEET
TCG ~ -O.OO FEET
T~ANS~'EFSE MET~CENTE~ ('E~q DEG~EES? = 45.05 FEET
MET~CENTI; 'C HEI~HT UPkIGHT ( ~E~O DEG~EES ? - O. 05 FEET
HEEL ~NCLE ~IGHTING ~M DISPL~CEIqENTLCE~ OF~Fr TF~IM ITEF~TIO~J
?~ -3 . 7 '~, 99~. ~7 . _. 80 57. ;~6 -;~. 8~ 15 10~ 00~ 44 1'?, 9~9. q7 ` SDO8 5~.?1-4;~ 9 ?~0 . f~OO O . 408 1 9, 5'99 . 973 . 22 57 . 66 ~.. 8 ., 99 7 30 . OOQ 1;; . .~ . 97 1 .. 57 57. ~ ~ -15 ~
O.~)OO _?~,_41 19~999.97 1... 71 ~.. 65~ _~?~ ~4~ 10 III~3 ~ D ~ G E~ T ~ T~ ~ T
VE~~ N~ME .SC)DE~ W~DE D~rE
~,E~EL ,~F~T FTLE N~E MSl!--~5 Q~ .r~ ~Qh!~FT~Ei~T r ~LL ~.J--~r Q A~ rC) ~ Qt~!QITIQ~ 1 DF~FT 50. ~0 FEET
DISPLnCEMENT ~Q~_~O.OO T3NS
V5G 4S.OQ FEET~ ,'E ~ EIINE) L~ 0.00 FEET(+= F~C ~I~IDSHIF~S~
C/~M~GED COllF'~F~Tt1ENTS
Il) NO~ COt~F'~F`'T~1ENT F~E~ME~C~ILITr TANI~ ~UTFLQW D~T~
FILL QEPTH DEN5IT~ F~EE SIJ~F~E
(FEET) (FT~,TqN.) (FT~TQNS`
1 CQLUMN 1-S 1.90 ~4.90 J5.;~J 0~9 D~ CED SHIF' F 1;3PEF' TIES ~FTEF; OUTFL!:1W
QISPL~CEMENT = O95?~.~7 TQNS LCG 3 ~O.OQ FEET
~CI~ = 45~00 FEET
TCG = -0. 00 FEET
TF~r~ EI;~CiE ~iET~OE.hlTEÇ: ~ 'El::Q ~EÇh'EES l = ~4 . ~ ~ FEET
i~lETArENT.~I~ HEIÇHT !iFF':r5HT i7Er~o QEGF~EES~ = 1.~ FEET
~EEL ~,~ÇLE ~:IG!ITING P.F~M QISFL~CEMENT LCC~ DF;AFT T~IM ITEF~TIQ~`' O. QOQ -.~. 301 ~0, 5~. ?7 r~ 5~ ~7. ~7 -31. 7.~ 13 10. OQ;~ -O. ~71 ~0, 5~9. ~7 4. 76 .5~. 7' -40. 3~ 3 "'`.Q`~ ~.57~ o,~ 7 ~"34 .j~.Q~3 -~9.50 7 '3 0 .~ 5 . 5 01 ? O ~ 5 5~ S> . ~7 ~ ~ 71 . _ S~ 1 'J . .J ~ 6 ~0.~ 3S.704 :~0,5~ 7 ~.OS ~ 5 14
4'7/

'Jr~.EL tJf`t,'E ~ r~EG WI~E ~TE
tq t~ D CQ ~ND ' T I Q~ Z5 C~F ,~. !'5Q. 00 FEET
DI~r L~CcrlENT ~Q~ ~00. 00 TQNS
G 45 . 00 FEE:T ~ ~C~OVE E f~8EL INE
LCl~ 0.00 FEET~+= FWD ~ IDSHIF~
Dt^tMP~E~t COMF~^tF~.TilFNT~;
I~ ~JO.COZ~F~F~.T~lE:NT F'EFIME~E~ILITY TAtJ~ JTFLOW D,tTA
FILL ~EFTH rlE~JaITY FF;EE CI~FF^:-:
(FEET~~ FT~.,'TlJN ) ( FT-T',~i -LU~N 1-S 1. 00 ~~4. 00 ~5 . 00 O. O
3 PQNTOQN 1-~; 1. 00 07 00 35. 00 O. O
Qt~ GECt Sl-lIF' Fl;OF~EkTIES t4FTER OlJTFLOW
D~8F'L~iCEMENT = to~, 5~ 39 TONS LCG = -0~ 00 FEET
'~'CG = 45~ OQ FEE i TCG = -0.~0 FEET
rl~PN~VE.h~SE ~1ET~CENTEF~ ~ ZEF~Q DEGF~EES ~ _ 5t5, 7r FEET
r~E1^~l-E~TF~IC tlEIGHT UF'F~IGHT (ZEfi~l:l DEG~EES) = 50.75 FEET
HEEL i~ LE r~It,HTIN~ r~M~ISFLi~CE:MENT LCC~ Df~FT Tr~I~ rTF~r7TI'',' ~t,~)--15. 1~1 ~07 5~9. 39 ~ t5~ 0~ --54 44 ?~
10- QOO~~- 83~`3 20~ 5~. a~ ~,. ?1 64.. 49 -55 04 7 `0.~ ^'4.9~ 0~55!5t.39 4.4 .05\ -41.'~
~Ct. ~00 `.` "` .. 1.56 ''Q9 5~. 8~ 3. 5'1 , 7. 1~ -42. 710 . Ct Çt O ? ~ 3 _ o, 5 9 9 . .8 s~ ? S ~. .5 4 --5 ? . 3 ~, 1 , rrr~

Claims (5)

CLAIMS:
1. A wide-based, semi-submersible vessel comprising a longitudinally elongated deck (10), means including a plurality of stability columns (20) extending from the deck, elongated pontoon means (30) connected to the lower ends of each of the stability columns for providing a wide buoyant base, the pontoons having the same cross-sectional area along the longitudinal axis thereof, and means (64, 66) in the columns and pontoons for discharging and taking on ballast, characterized in that each of the stability columns extends downwardly and outwardly from the bottom of a respective port or starboard side edge of the deck for changing the effective beam of the vessel as a function of draft.
2. A vessel according to claim 1, wherein the means providing the base comprises a pair of longitudinally elongated pontoons connected to the lower ends of the stability columns on each side of the vessel.
3. A vessel according to claim 1, further characterized in that the deck is water tight.
4. A vessel according to claim 1, further characterized in that sponsons (54, 56) each comprising an elongate, horizontally-extending hollow body are provided along the bottom of each of the port and starboard sides of the deck and above the stability columns.
5. A vessel according to claim 4, wherein the inner surface (58, 60) of each of the sponsons extends downwardly and outwardly from the center portion (52) of the deck at the same angle as the stability columns.
CA000452681A 1983-04-28 1984-04-25 Wide based semi-submersible vessel Expired CA1250188A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US48967083A 1983-04-28 1983-04-28
US489,670 1983-04-28
US56465783A 1983-12-23 1983-12-23
US564,657 1983-12-23

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CA1250188A true CA1250188A (en) 1989-02-21

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EP (1) EP0124338B1 (en)
JP (1) JPH057596U (en)
KR (1) KR940009262B1 (en)
AU (1) AU579099B2 (en)
CA (1) CA1250188A (en)
DE (1) DE3471910D1 (en)
DK (1) DK211784A (en)
ES (1) ES8600142A1 (en)
FI (1) FI79989C (en)
NO (1) NO841693L (en)
PT (1) PT78495B (en)
SG (1) SG76788G (en)

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NO316371B1 (en) * 2000-10-06 2004-01-19 Moss Maritime As platform Construction
KR101005897B1 (en) * 2008-05-26 2011-01-06 대우조선해양 주식회사 Inclination test method using BOP transmitter
KR101310958B1 (en) * 2009-03-05 2013-09-23 대우조선해양 주식회사 semi-submersible typed drill rig with effective particle transferring structure
EP2927109B1 (en) 2010-07-08 2017-05-03 Itrec B.V. Drilling installation, semi-submersible vessel and operating method
WO2020149874A1 (en) 2019-01-18 2020-07-23 Keppel Floatec, Llc Inboard extended column semi-submersible
JP6618063B1 (en) * 2019-03-25 2019-12-11 華南理工大学 On-site control equipment for treating oil-polluted water areas
ES2938666B2 (en) * 2021-10-07 2023-11-22 Sener Ing & Sist SEMI-SUBMERGIBLE FLOATING PLATFORM FOR MARINE WIND TURBINE

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US3616773A (en) * 1968-09-04 1971-11-02 Santa Fe Int Corp Twin hull variable draft drilling vessel
US3556033A (en) * 1969-08-01 1971-01-19 Inst Francais Du Petrole Semi-submersible floating structure with dynamic positioning
CA942594A (en) * 1969-10-29 1974-02-26 James C. Harper Method and mobile marine platform apparatus having floating submerged mat stabilization
FR2137154B1 (en) * 1971-05-14 1973-05-11 Emh
FR2188558A5 (en) * 1972-06-01 1974-01-18 George Yves
US4112864A (en) * 1976-10-08 1978-09-12 Seatek Corporation Heave stabilization of semi-submersible platforms
CA1075092A (en) * 1976-01-19 1980-04-08 Seatek (A California Partnership) Method and apparatus for stabilization of a floating semi-submersible structure

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AU2727584A (en) 1984-11-01
EP0124338A1 (en) 1984-11-07
SG76788G (en) 1989-10-13
FI79989B (en) 1989-12-29
DK211784A (en) 1984-10-29
EP0124338B1 (en) 1988-06-08
KR940009262B1 (en) 1994-10-06
DE3471910D1 (en) 1988-07-14
FI841659A0 (en) 1984-04-26
PT78495A (en) 1984-05-01
ES531985A0 (en) 1985-10-01
NO841693L (en) 1984-10-29
AU579099B2 (en) 1988-11-17
FI841659A (en) 1984-10-29
JPH057596U (en) 1993-02-02
KR840008625A (en) 1984-12-17
DK211784D0 (en) 1984-04-27
ES8600142A1 (en) 1985-10-01
FI79989C (en) 1990-04-10
PT78495B (en) 1986-03-20

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