DK161627B - DEVICE ON A SEMI-SIMPLIFIED PLATFORM TO LIMIT A LEAK CAKE - Google Patents
DEVICE ON A SEMI-SIMPLIFIED PLATFORM TO LIMIT A LEAK CAKE Download PDFInfo
- Publication number
- DK161627B DK161627B DK078484A DK78484A DK161627B DK 161627 B DK161627 B DK 161627B DK 078484 A DK078484 A DK 078484A DK 78484 A DK78484 A DK 78484A DK 161627 B DK161627 B DK 161627B
- Authority
- DK
- Denmark
- Prior art keywords
- pontoon
- semi
- pontoons
- platform
- buoyancy
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
- B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
- B63B43/10—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving buoyancy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
- B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
- B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
- B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/12—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude for indicating draught or load
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
- B63B39/14—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude for indicating inclination or duration of roll
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/442—Spar-type semi-submersible structures, i.e. shaped as single slender, e.g. substantially cylindrical or trussed vertical bodies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Bridges Or Land Bridges (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Cleaning Or Clearing Of The Surface Of Open Water (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Emergency Protection Circuit Devices (AREA)
- Electromechanical Clocks (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Description
iin
DK 161627 BDK 161627 B
Opfindelsen angår en indretning på en halvt-nedsænkelig platform, der består af et arbejds- eller beboelsesdæk, to eller flere aflange pontoner og mindst tre søjler, hvilken indretning er indrettet til at begrænse en som følge af lækage i 5 pontonerne eller søjlerne forårsaget skrå flydest i 11 ing.The invention relates to a device on a semi-submersible platform consisting of a working or residential tire, two or more elongated pontoons and at least three columns, which device is adapted to limit an oblique flow caused by leaks in the pontoons or columns. in 11 ing.
Den senere tids ulykker i forbindelse med boreplatforme har foranlediget en efterprøvning af sikkerhedsforskrifterne for halvt-nedsænkelige platforme. Sådanne sikkerhedsforskrifter 10 indebærer f.eks., at hældningsvinklen skal begrænses til 15°, når der forekommer lækager i pontoner eller søjler på grund af ydre eller indre beskadigelse.Recent accidents related to drilling platforms have led to a review of the safety regulations for semi-submersible platforms. Such safety regulations 10, for example, imply that the angle of inclination must be limited to 15 ° when there are leaks in pontoons or columns due to external or internal damage.
Der findes mange forskellige måder, hvorpå der kan iværksættes 15 en sådan begrænsning af hældningsvinklen. En mulighed er at vælge en passende fin opdeling af de opdriftfremkaldende volumener ved hjælp af vandtætte skotter og dæk. En anden mulighed er at øge stabiliteten af den halvt-nedsænkelige platform i den normale, intakte tilstand. En tredie mulighed er at ud-20 nytte tilstedeværende bal!astarrangementer og at fylde vand tætte skotter med skumstofmateriale (skumfyldning), som hindrer vandet i at trænge ind i disse skotter. Det er også kendt at forbedre eksisterende halvt-nedsænkelige platforme ved efterhånden at anbringe ekstra søjler.There are many ways in which such a restriction of the angle of inclination can be implemented. One option is to choose a suitable fine division of the buoyancy-inducing volumes using watertight bulkheads and tires. Another option is to increase the stability of the semi-submersible platform in the normal, intact state. A third option is to utilize balloon arrangements present and to fill water dense bulkheads with foam material (foam filling) which prevents water from entering these bulkheads. It is also known to improve existing semi-submersible platforms by retrofitting additional columns.
2525
De nævnte tekniske foranstaltninger er alle uhensigtsmæssige på den ene eller anden måde med hensyn til den økonomiske drift af den halvt-nedsænkelige platform. F.eks. kan der nævnes, at hvis antallet af vandtætte skotter og dæk øges, øges 30 også omkostningerne til den halvt-nedsænkelige platform betydeligt. At øge stabiliteten i den intakte tilstand påvirker i ufordelagtig retning den måde, hvorpå platformen bevæger sig i dens halvt-nedsænkelige flydest i 11 ing. At tilvejebringe ekstra søjler eller indordne sig med ekstra ballast og andre foran-35 staltninger, som i væsentlig grad øger den halvt-nedsænkelige platforms vægt medfører normalt at transit-fribordet reduceres .The technical measures mentioned are all inconvenient in one way or another with regard to the economic operation of the semi-submersible platform. Eg. It can be mentioned that if the number of watertight bulkheads and tires increases, the cost of the semi-submersible platform also increases significantly. Increasing the stability of the intact condition adversely affects the way the platform moves in its semi-submersible flow test for 11 inches. Providing extra columns or aligning with extra ballast and other measures that substantially increase the weight of the semi-submersible platform usually causes the transit freeboard to be reduced.
DK 161627 BDK 161627 B
22
Formålet med den foreliggende opfindelse er at tilvejebringe en indretning, som reducerer og/eller begrænser den halvt-nedsænkelige platforms skrå flydesti 11ing, hvorved indretningen ikke skal medføre de ovenfor nævnte ulemper og især ikke 5 medføre nogen væsentlig vægtøgning eller forringelse af platformens bevægelsesmønster i dens halvt-nedsænkede stilling.The object of the present invention is to provide a device which reduces and / or limits the oblique flow angle of the semi-submersible platform, whereby the device should not cause the aforementioned disadvantages and in particular not cause any significant weight gain or deterioration of the platform's movement pattern in its half-submerged position.
Dette opnås ved, at den indledningsvis nævnte indretning ifølge opfindelsen er ejendommelig ved, at pontonernes form 10 uden for de pontonerne og dækket forbindende søjler ("pontonenderne") er udformet således, at en pontonendes volumencenter ligger oven for hele pontonens volumencenter, og at pontonen- den ved neddykket intakt tilstand ligger fuldstændigt under vandlinien.This is achieved in that the device mentioned in the invention is characterized in that the shape 10 of the pontoons outside the pontoons and covered connecting columns (the "pontoon ends") is designed such that the volume center of a pontoon lies above the entire volume center of the pontoon and that the pontoon - when immersed, it is completely below the waterline.
1515
Yderligere udførelsesformer for opfindelsen fremgår af under-kravene.Further embodiments of the invention are set forth in the claims.
Fra US-patentskrift nr. 3.874.314 kendes en halvt-nedsænkel ig 20 platform af den type, som er beskrevet indledningsvis. Den halvt-nedsænkelige platform ifølge dette patentskrift består af fire pontoner, en arbejdsplatform samt af søjler, som strækker sig imellem pontonerne og arbejdsplatformen. Den halvt-nedsænkelige platform har imidlertid ikke nogen ekstra 25 indretning til reducering og/eller begrænsning af den skrå flydesti 11ing således, som der foreslås ifølge den foreliggende opfindelse. I tidsskriftet "Schiff und Hafen", hæfte 2, 1981, er der beskrevet halvt-nedsænkelige platforme, som er indrettet til brug i isdækkede farvande. Pontonerne er hævet 30 fortil og har næseformede tilbygninger, som åbenbart ligesom en isbryder skal kunne bevæges op på isen og brække denne i stykker. Tidsskrifterne V'Ship & Boat International", juli/ august 1977, side 79 og >' 85 samt "New Ships/Die Neubauten", hæfte 2, side 42, 43 og 46 omtaler hal vt-nedsænkel ige plat-35 forme, hvori de viste søjler ved enderne af pontonerne i platformens halvt-nedsænkede symmetriske tilstand rager betydeligt op over vandoverfladen og på denne måde tjener til at tilveje-U.S. Patent No. 3,874,314 discloses a semi-submersible 20 platform of the type described initially. The semi-submersible platform according to this patent consists of four pontoons, a working platform and columns extending between the pontoons and the working platform. However, the semi-submersible platform has no additional device for reducing and / or limiting the inclined flow path as proposed in the present invention. The journal "Schiff und Hafen", booklet 2, 1981, describes semi-submersible platforms, which are designed for use in ice covered waters. The pontoons are raised 30 at the front and have nose-shaped extensions that obviously, like an icebreaker, must be able to move up on the ice and break it. The Journals V'Ship & Boat International ", July / August 1977, pages 79 and> '85, and" New Ships / Die Neubauten ", booklet 2, pages 42, 43 and 46 refer to semi-submersible platform 35 in which the columns shown at the ends of the pontoons in the half-submerged symmetrical state of the platform project significantly above the water surface and thus serve to provide
DK 161627 BDK 161627 B
3 bringe den nødvendige stabilitet i opretstående flydesti 11ing (dvs. i den intakte tilstand).3 bring the necessary stability in upright flow path 11 (i.e. in the intact state).
Fra US-patentskrift nr. 3.771.481 og den hertil hørende af-5 delte ansøgning nr. 27.478 kendes en halvt-nedsænkelig platform, som har ved siden anbragte halvsøjler, som er indrettet til at tilvejebringe tilstrækkelig stabilitet i den intakte tilstand ved små til middelstore havdybder, dvs. indtil den tilstand, hvor opdriftscentret vandrer op over tyngdepunktet.From U.S. Patent No. 3,771,481 and its associated application No. 27,478, a semi-submersible platform is known which has adjacent semi-columns which are arranged to provide sufficient stability in the intact state at small medium depths of sea, ie until the state where the buoyancy center migrates above the center of gravity.
10 Det viste arrangement åbner ikke mulighed for reducering og/eller begrænsning af den skrå flydestilling for den halvt-nedsænkelige platform, eftersom halvsøjlerne ikke når op til overfladen, hvis hældningsvinklen er 15°. De dominerende op-driftbetingelser i en platform af denne kendte type er vist i 15 den vedføjede fig. 1.The arrangement shown does not allow for the reduction and / or restriction of the oblique flow position of the semi-submersible platform since the semicolons do not reach the surface if the angle of inclination is 15 °. The dominant operating conditions in a platform of this known type are shown in the attached FIG. First
I en foretrukken udførelsesform for opfindelsen udgøres de opdriftf remkaldende volumener af opdriftkamre, som er monteret på pontonerne.In a preferred embodiment of the invention, the buoyancy volumes are buoyancy chambers mounted on the pontoons.
2020
Opfindelsen forklares nærmere nedenfor under henvisning til tegningen, hvor fig. 1 viser den opdrifttilstand, som hersker ved indretningen 25 ifølge US-patentskrift nr. 3.771.481, fig. 2 måden hvorpå indretningen ifølge opfindelsen påvirker stabilitetskurven for en halvt-nedsænkelig platform, og 30 fig. 3a, 3b en udførelsesform for en platform, som er udstyret med en indretning ifølge opfindelsen, og hvor fig. 3a er et snit efter linien Illa-IIIa i fig. 3b, og fig. 3 b er et snit efter linien Illb-IIIb i fig. 3a.The invention is explained in more detail below with reference to the drawing, in which fig. 1 shows the buoyancy condition prevailing by the device 25 of US Patent No. 3,771,481; 2 shows the way in which the device according to the invention affects the stability curve of a semi-submersible platform, and FIG. 3a, 3b is an embodiment of a platform equipped with a device according to the invention, in which fig. 3a is a sectional view taken along the line Illa-IIIa of FIG. 3b, and FIG. 3b is a section along the line Illb-IIIb of FIG. 3a.
35 Af fig. 3 fremgår det, at en halvt-nedsænkelig platform af den type, som har en arbejdsplatform 3, hvorpå der i det mindste er anbragt et arbejdsdæk og/eller beboelsesdæk, bæres af to35 From FIG. 3 it appears that a semi-submersible platform of the type having a working platform 3 on which at least one working deck and / or residential deck is mounted is carried by two
OK 161627 BOK 161627 B
4 pontoner 1 via tre søjler 2, hvoraf to af disse søjler strækker sig imellem arbejdsplatformen 3 og den ene af pontonerne 1, og den tredie strækker sig imellem arbejdsplatformen og den anden ponton. På konventionel måde kan der være tilvejebragt 5 tværstivere imellem pontonerne for at stabilisere konstruktionen imod mekaniske belastninger.4 pontoons 1 via three columns 2, two of these columns extending between the working platform 3 and one of the pontoons 1, and the third extending between the working platform and the other pontoon. Conventionally, 5 transverse struts may be provided between the pontoons to stabilize the structure against mechanical loads.
Som det især fremgår af snittene i fig. 3a og 3b, har de to pontoner 1 en i alt væsentligt rektangulær tværsnitsform og 10 ved enderne 1' opadhældende skrogflader. Ved de yderste ender 1' af pontonerne 1 uden for det område, som begrænses af søjlerne, er der fastgjort opdriftfremkaldende kamre 4.As can be seen in particular from the sections of FIG. 3a and 3b, the two pontoons 1 have a substantially rectangular cross-sectional shape and 10 at the ends 1 'upwardly inclined hull surfaces. At the outer ends 1 'of the pontoons 1 outside the area bounded by the columns, buoyancy-inducing chambers 4 are attached.
Eftersom de opdriftfremkaldende kamre 4 er monteret pér de øvre 15 flader på pontonerne 1, vil volumencentrene for hver pontons 1 endeparti 1' komme til at ligge ved det punkt, der er vist ved henvisningstallet Sji+4 , medens volumencentret for hele pontonen ligger ved det punkt, som er forsynet med henvisnings-tallet S1 + 4 og er beliggende i en afstand h under punktet 20 ®l'+4* Som det fremgår af fig. 3b udvider de opdriftfremkal dende kamre 4 sig udad ved deres øvre flader, hvorved volumencentret for hvert opdriftfremkaldende kammer kommer til at ligge nærmere den øvre side af de opdriftfremkaldende kamre end den øvre side af den tilhørende ponton 1.Since the buoyancy-inducing chambers 4 are mounted on the upper 15 faces of the pontoons 1, the volume centers of each pontoon 1 end portion 1 'will be at the point shown by reference numeral Shi + 4, while the volume center of the entire pontoon is at the point bearing the reference numeral S1 + 4 and located at a distance h below the point 20®l '+ 4 * As can be seen from FIG. 3b, the buoyancy-generating chambers 4 extend outwardly at their upper surfaces, whereby the volume center of each buoyancy-producing chamber is located closer to the upper side of the buoyancy-generating chambers than the upper side of the associated pontoon 1.
2525
Den halvt-nedsænkelige platform bugseres normalt ud på havet og nedsænkes derefter partielt ved at fylde vand i rum, som findes anbragt i pontonerne 1 eller søjlerne 2. I den normale halvt-nedsænkede stilling, i hvilket arbejdsplatformen 3 helst 30 er vandret kan vandlinien 5 betragtes som beliggende ved den punkterede linie 5. Hvis der indtræder en lækage, f.eks. i et vandtæt rum 7 i den agter søjle 2 på den halvt-nedsænkel ige platform, vil platformen have tendens til at krænge over, hvorved vandlinien kan tænkes at komme til at ligge ved den 35 ved 6a viste linie. I denne stilling kommer det eksisterende opdriftfremkaldende kammer 4 til at ligge over vandoverfladen og derfor vil det ikke længere bidrage til den på platformen 5The semi-submersible platform is normally towed out to sea and then partially submerged by filling water in spaces found in the pontoons 1 or pillars 2. In the normal semi-submerged position, in which the working platform 3 is preferably horizontal, the waterline 5 is considered to be located at the dashed line 5. If a leak occurs, e.g. in a watertight compartment 7 in the aft column 2 of the semi-submersible platform, the platform will tend to overlap, whereby the waterline may be at the line 35 by 6a. In this position, the existing buoyancy-inducing chamber 4 will lie above the water surface and therefore it will no longer contribute to it on the platform 5
DK 161627BDK 161627B
virkende opdriftkraft fra de øvrige opdriftfremkaldende kamre. Resultatet bliver, at det resulterende opdriftsoentrum forskydes væk fra den centrale lodrette symmetriakse gennem platformen og reducerer krængningsvinklen. Størrelsen af denne re-5 duktion beror naturligvis på den eksisterende form af de opdriftf remkaldende kamre og af den af lækagen fremkaldte krængningsbevægelse.acting buoyancy power from the other buoyancy-inducing chambers. The result is that the resulting buoyancy center is displaced away from the central vertical axis of symmetry through the platform, reducing the angle of inclination. The size of this reduction, of course, depends on the existing form of the buoyancy-induced chambers and the inclination movement induced by the leak.
Hvis lækagen i stedet skulle indtræffe i den fortil beliggende 10 søjle 2, ville vandlinien have tendens til at følge linien 6b.If the leak were to occur in the front pillar 2 instead, the water line would tend to follow line 6b.
I dette tilfælde vil det bageste opdriftfremkaldende kammer 4 passere op over vandoverfladen og den opdriftkraft, som tilvejebringes ved hjælp af den eller de foranbeliggende opdriftfremkaldende kamre vil have tendens til at kompensere for den 15 krængningsbevægelse, der skyldes lækagen.In this case, the rear buoyancy chamber 4 will pass above the water surface and the buoyancy force provided by the buoyancy buoyancy chamber (s) will tend to compensate for the heel movement caused by the leak.
Hvis lækagen skulle indtræffe i den centrale søjle 2 ville de to opdriftfremkaldende kamre på den ponton, hvorpå de øvrige to søjler 2 er beliggende,, have tendens til at bevæge sig op 20 ad vandet, så at de ikke længere bidrager til platformens opdrift. Opdriften fra de to nedsænkede opdriftfremkaldende kamre 4 på den ponton 1, hvorpå den centrale søjle 2 er fastgjort vil derfor frembringe et moment, som har tendens til at modvirke det krængningsmoment, der skyldes lækagen i den cen-25 trale søjle 2.If the leak were to occur in the central pillar 2, the two buoyancy-generating chambers on the pontoon on which the other two pillars 2 are located would tend to move up to the water so that they no longer contribute to the buoyancy of the platform. The buoyancy of the two submerged buoyancy-producing chambers 4 on the pontoon 1 to which the central column 2 is attached will therefore produce a torque which tends to counteract the torque caused by the leakage in the central column 2.
De virkninger, som de opdriftfremkaldende kamre fremkalder er vist grafisk i f i g. 2. Kurven i fig. 2 viser tydeligt for skydningen af det oprettende moment med henholdsvis uden til-30 bygninger som funktion af krængningsvinklen. En ændring i krængningsvinklen som følge af disse tilbygninger udgør, som det ses op til flere grader, og dette kan være kritisk med hensyn til platformens sikkerhed.The effects that the buoyancy-inducing chambers produce are shown graphically in f in g. 2. The curve in fig. 2 clearly shows the firing of the erecting torque with, without addition, 30 buildings respectively as a function of the angle of inclination. A change in the angle of heel due to these extensions constitutes, as seen up to several degrees, this can be critical in terms of platform security.
35 I den i fig. 1 viste kurve, som viser de herskende opdri ftbetingelser ved en konstruktion ifølge US-patentskrift nr. 3.771.481 anvendes i forbindelse med konventionelle betegne!-35 In the embodiment of FIG. 1, which shows the prevailing operating conditions of a structure according to U.S. Patent No. 3,771,481 is used in conjunction with conventional designations.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19833306057 DE3306057A1 (en) | 1983-02-22 | 1983-02-22 | DEVICE FOR A SEMI-DIVER TO LIMIT A TRIM LOCATION CAUSED BY A LEAK |
| DE3306057 | 1983-02-22 |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| DK78484D0 DK78484D0 (en) | 1984-02-20 |
| DK78484A DK78484A (en) | 1984-08-23 |
| DK161627B true DK161627B (en) | 1991-07-29 |
| DK161627C DK161627C (en) | 1992-01-13 |
Family
ID=6191471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK078484A DK161627C (en) | 1983-02-22 | 1984-02-20 | DEVICE ON A SEMI-SIMPLIFIED PLATFORM TO LIMIT A LEAK CAKE |
Country Status (7)
| Country | Link |
|---|---|
| JP (2) | JPS59160694A (en) |
| KR (1) | KR940009261B1 (en) |
| DE (1) | DE3306057A1 (en) |
| DK (1) | DK161627C (en) |
| GB (1) | GB2135262B (en) |
| NO (1) | NO163275C (en) |
| SE (1) | SE457524B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3771481A (en) * | 1971-05-03 | 1973-11-13 | Santa Fe Int Corp | Single column semisubmersible drilling vessel |
| US3837309A (en) * | 1971-06-17 | 1974-09-24 | Offshore Technology Corp | Stably buoyed floating offshore device |
| GB1594938A (en) * | 1977-10-28 | 1981-08-05 | Hart A S C | Free floating marine structure |
| JPS5543959A (en) * | 1978-09-20 | 1980-03-28 | Fujikura Ltd | Elevator tower wiring structure |
-
1983
- 1983-02-22 DE DE19833306057 patent/DE3306057A1/en not_active Withdrawn
-
1984
- 1984-02-15 JP JP59027962A patent/JPS59160694A/en active Pending
- 1984-02-17 GB GB08404167A patent/GB2135262B/en not_active Expired
- 1984-02-20 NO NO840620A patent/NO163275C/en unknown
- 1984-02-20 DK DK078484A patent/DK161627C/en not_active IP Right Cessation
- 1984-02-21 SE SE8400951A patent/SE457524B/en unknown
- 1984-02-22 KR KR1019840000845A patent/KR940009261B1/en active IP Right Grant
-
1990
- 1990-04-13 JP JP1990040190U patent/JPH02136797U/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE8400951L (en) | 1984-08-23 |
| NO163275B (en) | 1990-01-22 |
| DK161627C (en) | 1992-01-13 |
| KR840007692A (en) | 1984-12-10 |
| JPH02136797U (en) | 1990-11-14 |
| SE457524B (en) | 1989-01-09 |
| SE8400951D0 (en) | 1984-02-21 |
| NO840620L (en) | 1984-08-23 |
| KR940009261B1 (en) | 1994-10-06 |
| GB2135262A (en) | 1984-08-30 |
| GB2135262B (en) | 1986-06-04 |
| DK78484D0 (en) | 1984-02-20 |
| DE3306057A1 (en) | 1984-08-23 |
| JPS59160694A (en) | 1984-09-11 |
| GB8404167D0 (en) | 1984-03-21 |
| DK78484A (en) | 1984-08-23 |
| NO163275C (en) | 1990-05-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3224401A (en) | Stabilized floating drilling platform | |
| KR101535888B1 (en) | System and method for the active and passive stabilization of a vessel | |
| US8387550B2 (en) | Offshore floating platform with motion damper columns | |
| US20090126616A1 (en) | Offshore floating production, storage, and off-loading vessel for use in ice-covered and clear water applications | |
| US3279407A (en) | Surface vessel | |
| EP0832817B1 (en) | Shallow draft floating offshore drilling/producing structures | |
| EP0559806A1 (en) | Watercraft hull modification. | |
| BR112012005671B1 (en) | single hull vessel for equipment implementation and recovery in the offshore region and method for submerging equipment | |
| US3397545A (en) | Marine structure | |
| RU2203828C2 (en) | Hull construction | |
| US4869192A (en) | Semi-submersible drilling unit with cylindrical ring floats | |
| WO2013167805A1 (en) | Marine vessel | |
| GB1233422A (en) | ||
| CA2302507A1 (en) | Semisubmersible offshore vessel | |
| US20130287502A1 (en) | Ballast System For Floating Offshore Platforms | |
| WO1984001554A1 (en) | Floating, semi-submersible structure | |
| DK161627B (en) | DEVICE ON A SEMI-SIMPLIFIED PLATFORM TO LIMIT A LEAK CAKE | |
| EP0124338B1 (en) | Wide based semi-submersible vessel | |
| US6899049B2 (en) | Apparatus and method of constructing offshore platforms | |
| US20020152942A1 (en) | Ballast tank arrangement for double-hull tanker | |
| JP2007112330A (en) | Double hull structure of ship engine room | |
| KR102039557B1 (en) | ship having inundation prevention layer | |
| US1377222A (en) | Ship | |
| US20090154999A1 (en) | Floating Pier | |
| CN215155511U (en) | Semi-submersible ship capable of preventing overturning in submerging process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PBP | Patent lapsed |