NL2012224C2 - Ship, as well as hull for such ship. - Google Patents

Ship, as well as hull for such ship. Download PDF

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Publication number
NL2012224C2
NL2012224C2 NL2012224A NL2012224A NL2012224C2 NL 2012224 C2 NL2012224 C2 NL 2012224C2 NL 2012224 A NL2012224 A NL 2012224A NL 2012224 A NL2012224 A NL 2012224A NL 2012224 C2 NL2012224 C2 NL 2012224C2
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NL
Netherlands
Prior art keywords
hull
ship according
section
ship
front section
Prior art date
Application number
NL2012224A
Other languages
Dutch (nl)
Inventor
Richard Burger
Original Assignee
Ihc Holland Ie Bv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ihc Holland Ie Bv filed Critical Ihc Holland Ie Bv
Priority to NL2012224A priority Critical patent/NL2012224C2/en
Priority to PCT/NL2015/050085 priority patent/WO2015119504A1/en
Application granted granted Critical
Publication of NL2012224C2 publication Critical patent/NL2012224C2/en

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Classifications

    • 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
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • 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

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

A ship comprises a hull (10) having a front section (8) which comprises a bow (6), an aft section (9) which comprises a stern (7), side walls (2, 3) which extend between the bow and the stern, a bottom (11, 12) joining the lower edge of the side walls and a deck (5) joining the upper edge of the side walls. The front section of said hull defines a main draft which is generally constant over at least part of longitudinal direction the front section. With the aim of providing a stable platform for carrying out offshore operations, the waterline of the hull (1) has a triangular shape the top which is located at or near the bow (6) and the aft section (9) of the hull (1) comprises a reduced draft.

Description

Ship, as well as hull for such ship
The invention is related to a ship comprising a hull having a front section which comprises a bow, an aft section which comprises a stem, side walls which extend between the bow and the stem, a bottom joining the lower edge of the side walls and a deck joining the upper edge of the side walls, wherein the front section of said hull defines a main draft which is generally constant over at least part of the front section.
In particular, the invention is related to a ship or vessel which may be used as a platform for carrying out offshore operations, such as drilling or mining operations and the like. In this connection, it is desirable for such ship or mining vessel to have an operation window which is as long as possible so as to reduce downtime. This has a favorable influence on the operation costs of the ship and of the associated installations on board the ship.
The operation window is to a large extent determined by the ship’s behavior under wave and wind conditions. A stable behavior with respect to harsh conditions results in a large operation window and reduced operation costs. In particular, the ship’s response to waves and wind in the form heave and roll motions etc. is of importance. Prior art ships however have an operation window which is too small.
The object of the invention is therefore to provide a ship the hull of which provides a relatively long operation window. This object is achieved in that the waterline of the front section at least partly has a triangular shape, the top of which triangular shape is located at or near the bow and in that the aft section of the hull comprises a reduced draft.
The side walls are arranged according to the triangular shape. As a result of the triangular shape of the hull, first of all a small waterline surface is obtained at the front section of the ship, resulting in a relatively low buoyancy at that location. Thereby, the pitch motions of the ship are mitigated. Furthermore, the centre of gravity of the triangular shaped hull is located relatively close to the stern. Thus, a stable platform is obtained and, in particular at the relatively wide aft section a large surface for carrying out operations is provided. The arm of this wide aft section with respect to the centre of gravity is relatively small, which also is favorable for creating stable working conditions. This advantage can be used for instance for locating a moon pool in that area for drilling purposes. Preferably, such moon pool is arranged in the vicinity of the centre of gravity. It is pointed out that, although the front section of the hull has a relatively small waterline surface, and thus the capacity for carrying cargo at said front section per se is limited, this is compensated by the reduced draft at the aft section. In this way, imbalance is avoided. A further advantage of the hull shape is that it allows a relatively high speed of the ship. In comparison to prior art ships, such as mining vessels, the hull has a relatively low resistance. In combination with the sharp, rectangular bow, which cuts through the waves, this makes it possible to travel faster.
According to a first embodiment, the stem may coincide with the base of the triangular shape. However, it is not always necessary' to have the triangular shape of the front section extend up to the stern. According to a second, alternative embodiment, the hull may comprise a mid section which is located between the front section and the aft section, which mid section has a waterline has a shape which is different from the triangular shape of the front section.
The mid section may have a reduced draft which merges into the reduced draft of the aft section. The mid section may have a reduced draft over the part thereof adjoining the aft section and the same draft as the front section over the part of the mid section which adjoins the front section. Alternatively, the mid section may have a reduced draft over its full length.
The waterline of the front section may be defined by a triangle shape the top of which is smaller than the top of the triangular shape of the front section. Also, the waterline of the mid section may be parallel, i.e. the side walls at the location of the mid section may be parallel in longitudinal direction.
The large area available at the aft section provides ample space for the installations which are used in carrying out the operation, such as mining equipment and installations for handling the materials obtained by the mining operation. Alternatively or additionally, a drill rig and the like may be located at the aft section. The triangular shape of the hull with its relatively wide aft section also provides the ship with favorable properties in relation to wheathervaning and head winds. The ship in question may have a considerable size; as an example, it may have a length of around 250 m, a largest width of 60 m and a draft of 10 m.
The ship can be carried out in several ways. For instance, the section of the hull having a reduced draft may extend between generally the centre of gravity of the hull and the stem. Preferably, the front section, when seen in longitudinal direction, has a constant main draft. Furthermore, the draft of the hull near or at the stem amounts to about 0 - 0,5 times the main draft. Preferably, the draft is reduced monotonously. However, in other to prevent slamming of the stem it extends to below the waterline. The top angle of the triangular shape may be in the range between 0° and 60°. Preferably, the side walls are generally perpendicular with respect to the deck and/or the bottom.
Preferably, the triangular shape is isosceles. According to a specific embodiment, the opposite ends of the stem may comprise cutoffs forming stern planes which are angled with respect to each other. The bottom may have at least a reinforcement structure, such as a bent, curved or folded bottom portion for the purpose of increasing the resistance of the bottom against buckling.
The invention is furthermore related to a hull for a ship described before, said hull having a front section which comprises a bow, an aft section which comprises a stern, side walls which extend between the bow and the stem, a bottom joining the lower edge of the side walls and a deck joining the upper edge of the side walls, wherein the front section of said hull defines a main draft which is generally constant over at least part of longitudinal direction the front section. This hull is characterized in that the waterline of the front section at least partly has a triangular shape, that the top of the triangular shape is located at or near the bow and in that the aft section of the hull comprises a reduced draft.
Reference is made to the hull design as disclosed in WO-A-01/79054. The hull thereof has a draft which is reduced all the way from the bow to the stem. The purpose of this design is to allow transonic speeds. Such design is not fit for serving as a stable work platform aimed at carrying out offshore operations.
The hull design according to EP-A-678445 has a reduced draft at the aft section. The waterline shape is not triangular but sinusoidal. The purpose of this design is to provide a homogeneous flow of water under the stem.
The invention will now be described further with respect to the embodiments shown in the drawings.
Figure 1 shows a side view of a first embodiment of the ship.
Figure 2 shows a top view of the ship of figure 1.
Figure 3 shows a side view of a second embodiment of the ship.
Figure 4 shows a top view of the ship of figure 3.
Figure 5 shows a view in perspective of the second embodiment of the ship.
The ship shown in figures 1 and 2 consists of a hull 1 having side walls 2, 3, a bottom 4 and a deck 5. The side walls 2, 3 extend generally according to the legs of an isosceles triangle the imaginary top of which is indicated at 10. The base of the triangular shape coincides with the stern 7 of the hull 1. The bow 6 has a somewhat rounded shape.
The hull 1 has a front section 8 and an aft section 9. At the location of the front section 8, the hull 1 has a constant main draft, as indicated by the flat bottom part 11. The draft at the location of the aft section 9 is reduced towards the stem 7, as indicated by the sloping bottom part 12. The centre of gravity is shown at 13. As a result of the hull’s shape, the location of this centre of gravity 13 is relatively close to the stern. Around this area, a moon pool 15 is located in the embodiment shown. The deck house 14 is located on the aft section 9.
According to a slightly different embodiment, the stem 7 may have cutoffs 16 at the comers of the hull 1 as shown by the dotted lines in figure 2. Such layout may be useful for launching and recovering ROV’s, deep sea mining equipment and the like.
Although the ship as described before and as shown in the drawings is fit for carrying out different operations, it is pointed out that it can in particular be used as a mining vessel for carrying out mining operations on the sea bottom.
The embodiment of the ship as shown in the figures 3-5 has a hull 1 which comprises a mid section 17 as well. This mid section adjoins the front section 8 and the aft section 9. The side walls 18 of the mid section 17 may have a waterline which coincides with a triangle the top of which has an angle which is smaller than the top angle of the front section 8.
List of reference numerals I. Hull 2.,3. Sidewall 4. Bottom 5. Deck 6. Bow 7. Stern 8. Front section 9. Aft section 10. Imaginary top II. Flat bottom part 12. Sloping bottom part 13. Centre of gravity 14. Deck house 15. Moon pool 17. Mid section 18. Side wall mid section

Claims (21)

1. Schip, omvattende een romp (10) met een voorste sectie (8) die een boeg (6) omvat, een achterste sectie (9) die een hek (7) omvat, zijwanden (2, 3) die zich uitstrekken tussen de boeg en het hek, een bodem (11,12) grenzend aan de onderste rand van de zijwanden en een dek (5) grenzend aan de bovenste rand van de zijwanden, waarbij de voorste sectie van die romp een hoofdingang heeft die in het algemeen constant is over tenminste een deel van de langsrichting van de voorste sectie, met het kenmerk dat de waterlijn van de voorste sectie (8) tenminste gedeeltelijk een driehoekige vorm heeft, dat de top van de driehoekige vorm zich bevindt ter plaatse van of nabij de boeg (6) en dat de achterste sectie (9) van de romp (1) een verkleinde diepgang heeft.A ship comprising a hull (10) with a front section (8) comprising a bow (6), a rear section (9) comprising a fence (7), side walls (2, 3) extending between the bow and fence, a bottom (11, 12) adjacent to the lower edge of the side walls and a deck (5) adjacent to the upper edge of the side walls, the front section of that hull having a main entrance that is generally constant is over at least a part of the longitudinal direction of the front section, characterized in that the water line of the front section (8) has at least partially a triangular shape, that the top of the triangular shape is located at or near the bow ( 6) and that the rear section (9) of the hull (1) has a reduced draft. 2. Schip volgens conclusie 1, waarbij de achterste sectie (9) van de romp (1) een verkleinde diepgang heeft die zich uitstrekt tussen in het algemeen het zwaartepunt (13) van de romp en het hek (7).Ship according to claim 1, wherein the rear section (9) of the hull (1) has a reduced draft that generally extends between the center of gravity (13) of the hull and the fence (7). 3. Schip volgens conclusie 1 of 2, waarbij de diepgang van de romp (1) nabij of ter plaatse van het hek (7) 0-0,5 maal de hoofdingang bedraagt.Ship according to claim 1 or 2, wherein the draft of the hull (1) near or at the location of the fence (7) is 0-0.5 times the main entrance. 4. Schip volgens een van de voorgaande conclusies, waarbij de hoofddiepgang constant is over de voorste sectie (8) van de romp (1) die die hoofddiepgang bepaalt.Ship according to one of the preceding claims, wherein the main draft is constant over the front section (8) of the hull (1) that determines that main draft. 5. Schip volgens een van de voorgaande conclusies, waarbij het hek (7) samenvalt met de basis van de driehoekige vorm.Ship according to one of the preceding claims, in which the fence (7) coincides with the base of the triangular shape. 6. Schip als een van de conclusies 1-4, waarbij de romp een middelste sectie omvat die zich bevindt tussen de voorste sectie (8) en de achterste sectie (9), welke middelste sectie een waterlijn heeft die een vorm heeft die verschilt van de driehoekige vorm van de voorste sectie.Ship as one of claims 1-4, wherein the hull comprises a middle section located between the front section (8) and the rear section (9), which middle section has a water line that has a shape different from the triangular shape of the front section. 7. Schip volgens conclusie 6, waarbij de middelste sectie een verkleinde diepgang bezit die overgaat in de verkleinde diepgang van de achterste sectie (9).Ship according to claim 6, wherein the middle section has a reduced draft that merges into the reduced draft of the rear section (9). 8. Schip volgens conclusie 6 of 7, waarbij de waterlijn van de voorste sectie is betaald door een driehoekige vorm waarvan de tophoek kleiner is dan de tophoek van de driehoekige vorm van de voorste sectie.A ship according to claim 6 or 7, wherein the waterline of the front section is paid for by a triangular shape whose apex angle is smaller than the apex angle of the triangular shape of the front section. 9. Schip volgens een van de voorgaande conclusies, waarbij de tophoek van de driehoekige vorm van de voorste sectie (8) ligt tussen 0° en 60°.Ship according to one of the preceding claims, wherein the apex angle of the triangular shape of the front section (8) is between 0 ° and 60 °. 10. Schip volgens een van de voorgaande conclusies, waarbij de diepgang monotoon is verkleind.Ship according to one of the preceding claims, wherein the draft is reduced monotonously. 11. Schip volgens een van de voorgaande conclusies, waarbij het hek (7) zich uitstrekt tot onder de waterlijn ter verhindering van klappen op water.A ship according to any one of the preceding claims, wherein the fence (7) extends below the water line to prevent impacts on water. 12. Schip volgens een van de voorgaande conclusies, waarbij de zijwanden (2, 3) tenminste gedeeltelijk zijn opgesteld volgens de driehoekige vorm.Ship according to one of the preceding claims, wherein the side walls (2, 3) are arranged at least partially according to the triangular shape. 13. Schip volgens een van de voorgaande conclusies, waarbij de zijwanden (2, 3) in het algemeen loodrecht zijn met betrekking tot het dek (5) en/of de bodem (11, 12).Ship according to one of the preceding claims, wherein the side walls (2, 3) are generally perpendicular to the deck (5) and / or the bottom (11, 12). 14. Schip volgens een van de voorgaande conclusies, waarbij een doorgaande opening (moon pool) (15) is uitgevoerd in de nabijheid van het zwaartepunt (13).Ship according to one of the preceding claims, wherein a through-opening (moon pool) (15) is made in the vicinity of the center of gravity (13). 15. Schip volgens een van de voorgaande conclusies, waarbij een dekhuis (14) is gepositioneerd op de achterste sectie (9) van de romp (1).Ship according to one of the preceding claims, wherein a deck house (14) is positioned on the rear section (9) of the hull (1). 16. Schip volgens een van de voorgaande conclusies, waarbij de romp (1) is uitgevoerd als een casco met één enkele romp.Ship according to one of the preceding claims, wherein the hull (1) is designed as a hull with a single hull. 17. Schip volgens een van de voorgaande conclusies, waarbij de driehoekige vorm gelijkbenig is.A ship according to any one of the preceding claims, wherein the triangular shape is isosceles. 18. Schip volgens een van de voorgaande conclusies, waarbij de tegenoverliggende einden van het hek (7) afsnijdingen (16) omvatten die hekvlakken vormen die onder een hoek ten opzichte van elkaar zijn opgesteld.Ship according to one of the preceding claims, wherein the opposite ends of the fence (7) comprise cut-offs (16) which form fence surfaces arranged at an angle with respect to each other. 19. Schip volgens conclusie 18 wanneer afhankelijk van een der conclusies 6-8, waarbij de middelste sectie grenst aan de afsnijdingen (16).Ship according to claim 18 when dependent on any of claims 6-8, wherein the middle section is adjacent to the cuts (16). 20. Schip volgens een van de voorgaande conclusies, waarbij de bodem (11,12) tenminste een versterkingsstructuur heeft, zoals een gebogen of gevouwen bodemgedeelte.Ship according to any of the preceding claims, wherein the bottom (11, 12) has at least one reinforcing structure, such as a curved or folded bottom portion. 21. Romp (1) voor een schip volgens een van de voorgaande conclusies.The hull (1) for a ship according to one of the preceding claims.
NL2012224A 2014-02-07 2014-02-07 Ship, as well as hull for such ship. NL2012224C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL2012224A NL2012224C2 (en) 2014-02-07 2014-02-07 Ship, as well as hull for such ship.
PCT/NL2015/050085 WO2015119504A1 (en) 2014-02-07 2015-02-09 Ship, as well as hull for such ship

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2012224 2014-02-07
NL2012224A NL2012224C2 (en) 2014-02-07 2014-02-07 Ship, as well as hull for such ship.

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NL2012224C2 true NL2012224C2 (en) 2015-08-10

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NL2012224A NL2012224C2 (en) 2014-02-07 2014-02-07 Ship, as well as hull for such ship.

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WO (1) WO2015119504A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US23626A (en) * 1859-04-12 tucker
WO2000007873A1 (en) * 1998-07-21 2000-02-17 Petroleum Geo-Services As Hull shape ii

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5598802A (en) 1994-04-21 1997-02-04 Ramde; Roar R. Hull configuration
US6158369A (en) 1996-03-13 2000-12-12 Calderon; Alberto Alvarez Transonic hydrofield and transonic hull

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US23626A (en) * 1859-04-12 tucker
WO2000007873A1 (en) * 1998-07-21 2000-02-17 Petroleum Geo-Services As Hull shape ii

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PGS PRESIDENT ET AL: "Brief History of the Ramform Why Build a Third Generation Ramform?", vol. 8, no. 3, 1 March 2008 (2008-03-01), pages 1 - 4, XP055154361, Retrieved from the Internet <URL:http://techlib.pgs.com/MediaFiles/24_TechLink46_ramform sovereign_A4_std.pdf> [retrieved on 20141121] *

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