Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
  • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
  • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B11/00—Interior subdivision of hulls
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B11/00—Interior subdivision of hulls
  • B63B11/02—Arrangement of bulkheads, e.g. defining cargo spaces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
  • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
  • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
  • B63B25/082—Arrangements for minimizing pollution by accidents

Definitions

• a tank system for a hull that is substantially symmetrical about a centre axis, where several primary tanks are arranged between a centre structure and two or more ballast tanks, and where two adjacent primary tanks are mutually separated by a primary bulkhead extending from the centre structure and in a substantially radial direction outwards towards a hull side.
• a vessel hull with large fluid tanks that are arranged close to the side(s) of the hull is damaged in the hull side, severe losses of fluid and thus potentially severe contamination of the surrounding mass of water and coastlines may happen.
• hulls generally symmetrical about a vertical centre axis for example a cylindrical or a polygonal hull
• which is employed in among other floating drilling platforms, production, and storage facilities may contain poorly degradable and/or toxic matter of which as small amounts as possible should be released into the surrounding mass of water.
• ballast tanks are thereby generally arranged towards the periphery of the hull. If a fully loaded hull, where the ballast tanks consequently are empty, is damaged in the hull side, inflow or outflow of water to/from large ballast tank volumes may make the hull unstable. There are often requirements as to how deep into the hull one may assume that a possible damage may extend, and where on the hull this damage is likely to occur.
• a damage in the hull side is especially severe if the damage occurs in the area of a bulkhead separating two tanks, such that spilling of polluting fluid or in- or outflow of water to/from two adjacent tanks occurs.
• the object of the invention is to mitigate or to reduce at least one of the
• a hull of a ship usually has transverse bulkheads and longitudinal bulkheads for division of tanks.
• the transverse bulkheads will typically be radial or approximately radial
• the longitudinal bulkheads will typically be tangential or approximately tangential.
• the tangential bulkheads may in turn be straight or curved.
• the damage In order to damage two adjacent tanks separated by a radial bulkhead, the damage must occur on both sides of the radial bulkhead.
• such damage may occur as long as the outer hull side is penetrated on both sides of the bulkhead; consequently, an impact with a colliding vessel in the vicinity of a radial bulkhead will most likely cause damage to both the adjacent outer tanks.
• the solution to the task is based on the fact that a damage in the hull side, caused for example by a collision with another vessel, rarely extends far into the hull. This is of course due to the penetration resistance of the hull structures.
• the authorities also set requirements regarding the distance between an outer hull side and the bulkheads delimiting the product tanks against the spaces outside.
• the proposed solution is based on that for each of the radial bulkheads (primary bulkheads) separating the internal tanks, also referred to as primary tanks, product tanks or cargo tanks, and which in a known fashion is delimited against a hull side by primary ballast tanks, also known as secondary tanks, with an ordinary radial extension, a secondary ballast tank, also known as tertiary tank, is arranged, with a radial extension greater than the dimensioning radial damage extension for the hull.
• This secondary ballast tank can on one side be delimited by the radial bulkhead, or it can lie as an extension of the radial bulkhead.
• the extension of the secondary ballast tank in the peripheral direction of the hull must similarly to its radial extension be adapted to the dimensioning extent of damage which the hull is designed for. Typically, for ship collisions the damage extension in the horizontal direction rarely exceeds about 10 meters. Both for the radial and tangential extension of the secondary ballast tanks, the dimensioning requirement will solely represent minimum extensions, as both dimensions may be increased further without altering the inventive principle.
• the invention relates more specifically to a tank system for a hull substantially symmetrical about a centre axis, wherein a plurality of primary compartments are arranged between a centre structure and two or more secondary compartments, and where two adjacent primary compartments are mutually separated by a primary bulkhead extending from the centre structure and in a substantially radial direction outwards towards a hull side, characterized in that a tertiary compartment is delimited against two adjacent primary compartments and against adjacent secondary compartments, said tertiary compartment exhibiting a radial extension greater than a dimensioning, maximum damage depth extension for the hull.
• the tertiary compartment exhibits a peripheral extension greater than the dimensioning, maximum damage depth extension for the hull.
• several primary tanks are arranged between a centre structure and two or more ballast tanks, and where two adjacent primary tanks are mutually separated by a primary bulkhead extending from the centre structure and in a substantially radial direction outwards towards a hull side, characterized in that a secondary ballast tank is delimited against two adjacent primary tanks and against adjacent primary ballast tanks, as the secondary ballast tanks exhibits a radial extension greater than a dimensioning, maximum damage depth extension for the hull.
• the secondary ballast tanks may exhibit a peripheral extension greater than the dimensioning, maximum damage depth extension for the hull.
• the dimensioning, maximum damage depth extension for the hull may be according to the requirements in International Convention for the Prevention of Pollution from Ships (MARPOL). Alternatively, the dimensioning, maximum damage depth extension for the hull may be 10.50 meters.
• the primary bulkhead may delimit the secondary tank against one of the adjacent primary compartments.
• one or more of the primary compartments are cargo tanks.
• the secondary compartments are preferably ballast tanks.
• the tertiary compartments are ballast tanks or cargo tanks.
• the tertiary compartments are a condensate tanks.
• the secondary compartments are arranged along the hull periphery.
• the invention also concerns a vessel comprising a hull with a tank system as described above, where the vessel is a service, process or storage facility for a marine hydro carbon field, a service or energy conversion facility for a marine wind mill park, or provide living quarters.
• Figure 1 is a principle sketch of a horizontal section through a hull with a tank system according to the invention
• Figure 2 is a sketch similar to that of figure 1, but shows three different damages on the hull
• Figure 3 is a schematic perspective view of an embodiment of a twenty-cornered hull provided with stabilization skirt encircling a lower portion of the hull;
• Figure 4 is a schematic perspective view of another embodiment of a hull provided with stabilization skirt encircling a lower portion of the hull;
• Figure 5 is a schematic horizontal section through a hull with another embodiment of the tank system according to the invention.
• Figure 6 is a schematic horizontal section through a hull with yet another
• the reference number 1 indicates a hull floating in a body of water 4 and which is substantially symmetrical about a centre axis 111.
• the hull 1 is provided with a tank system 2 encircling a centre structure in the shape of a centre space 11, which in itself can be a vertical, open passage through the hull 1 for passing equipment (not shown), for example pipes and hoses, between the hull 1 and the body of water 4 or a seabed (not shown).
• the centre space 11 is delimited against the tank system 2 by a centre bulkhead 12.
• the centre space 11 may be formed as a cargo tank.
• the hull 1 is in the embodiment illustrated in figure 3 provided with stabilizing skirts 14 according to the prior art, protruding substantially horizontally outwards from a lower portion of a hull side 13.
• the tank system 2 comprises several primary tanks 21 in the form of cargo tanks delimited against the hull side 13 by several ballast tanks 22.
• the primary tanks 21 are mutually separated by primary bulkheads 211 extending substantially in the radial direction of the hull 1. At least some of the primary bulkheads 211 may extend between the centre bulkhead 12 and the hull side 13.
• One or more of the centre space 11 and the primary tanks 21 may be replaced by other volumes, for example processing facilities, without altering the inventive concept.
• the ballast tanks 22, which in a radial direction are delimited by the hull side 13, are formed of several primary ballast tanks 22a whose radial extension are substantially determined by the collective need for ballast volume of the hull 1, and is delimited against the primary tanks 21 by secondary bulkheads 221 extending substantially parallel with the hull side 13, and also by secondary ballast tanks 22b with a radial extension greater than a dimensioning maximum damage depth extension for this type of hull, for example greater than 10.50 meters as it is defined in International
• each secondary ballast tank 22b associated with each radial primary bulkhead 211, and with a normal dimensioning of the primary ballast tanks 22a, the secondary ballast tanks 22b will protrude radially into an adjacent primary tank 21.
• each secondary ballast tank 22b is delimited by a portion 21 la of the primary bulkhead 211, a portion 13a of the hull side 13 and by a tertiary bulkhead 231, alternatively by a portion 13a of the hull side 13 and by the tertiary bulkhead 231 if the secondary ballast tanks 22b protrude into two adjacent primary tanks 21, as the primary bulkhead 211 only extends radially outwards for connection with a radially inward portion of the tertiary bulkhead 231, as the secondary ballast tank 22b' to the left of the centre space 11 is shown in figure 1.
• the secondary ballast tanks 22b have a vertical extension substantially
• the centre bulkhead 12, primary bulkheads 211, secondary bulkheads 221, tertiary bulkheads 231 and the hull side 13 are in a manner that per se is known provided with not shown stiffening elements, for example horizontal and/or vertical ribs.
• the hull side 13 in the area between a primary ballast tank and a secondary ballast tank 22a, 22b is perforated, illustrated with a fourth hull damage 3d in figure 2.
• the tank volume that can be filled with inflowing water will be limited to one primary tank 21 and the damaged primary ballast tank 22a.
• the volume of the primary tank 21 is smaller than the volume of a corresponding primary tank according to the prior art, in that the primary tank 21 in the tank system 2 according to the invention has reduced volume as a consequence of the volume occupied by the adjacent secondary ballast tank 22b.
• the consequences of such a damage situation are less than for a tank system according to the prior art.
• the tank volume that can be filled with inflowing water will be limited to one secondary ballast tank 22b.
• the secondary ballast tank 22b has a considerably smaller volume than a primary tank according to the prior art and adjacent primary ballast tank 22a, in that the secondary ballast tank 22b in the tank system according to the invention constitutes a small part of the volume delimited by the hull side 13 and two adjacent primary bulkheads 211.
• the consequences of such a damage situation are considerably less than for a tank system according to the prior art.
• damage situation c which is the worst damage scenario
• the tank volume that can be filled with inflowing water will be limited to one primary and one secondary ballast tank 22a, 22b and also one primary tank 21.
• the affected tank volume equals the volume of a ballast tank according to the prior art and the primary tank arranged farther in.
• damage situation d which has an extent equalling damage situation c) when it comes to affected tank volumes, the damage is limited to one primary ballast tank 22a and one secondary ballast tank 22b and also one primary tank 21.
• Figure 4 shows another embodiment of a hull which is substantially symmetrical about a centre axis 111.
• the hull is provided with stabilizing skirts 14' supported by struts 15, protruding substantially horizontally outwards from a lower portion of the hull.
• the tank configuration illustrated by figure 5 comprises a centre space 11 ', which may be a vertical, open passage through the hull, or an enclosed compartment (e.g. tank) for cargo or equipment.
• a centre space 11 ' Arranged around the centre space 11 ' are primary compartments (e.g. cargo tanks) arranged in two concentric groups of first primary compartments 21 ' and second primary compartments 31.
• ballast compartments e.g. tanks 22a', 22b', which in a radial direction are delimited by the hull side 13, are formed of several primary ballast tanks 22a'
• secondary tanks whose radial extension are substantially determined by the collective need for ballast volume of the hull, and is delimited against the primary tanks 21 ' by bulkheads 22 extending substantially parallel with the hull side, and also by secondary ballast tanks 22b' with a radial extension greater than a dimensioning maximum damage depth extension for this type of hull, for example greater than 10.50 meters as it is defined in International Convention for the Prevention of Pollution from Ships (MARPOL) as of 1 November 2012.
• one secondary ballast tank 22b' is associated with each radial primary bulkhead 211, and with a normal dimensioning of the primary ballast tanks 22a', the secondary ballast tanks 22b' will protrude radially into an adjacent primary tank 21 '.
• Figure 6 shows yet another embodiment of a hull 1" which is substantially symmetrical about a centre axis 111.
• the tank configuration illustrated by figure 6 comprises a centre space 11", which may be a vertical, open passage through the hull, or an enclosed compartment (e.g. tank) for cargo or equipment.
• primary compartments e.g. cargo tanks
• primary compartments e.g. cargo tanks
• Secondary ballast tanks 22a" are arranged around the hull periphery. Secondary ballast tanks 22b" (referred to also as “tertiary compartments”) are arranged radially inside the secondary compartments
• the primary compartment 21a" may be a cargo hold (for e.g. LNG); the secondary compartment 22a" may be a primary ballast tank; and the tertiary compartment 22b" may be a secondary ballast tank or a cargo hold (for e.g. condensate).

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Environmental & Geological Engineering (AREA)
• Health & Medical Sciences (AREA)
• Public Health (AREA)
• Filling Or Discharging Of Gas Storage Vessels (AREA)
• Body Structure For Vehicles (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)

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• 2012
  • 2012-11-19 NO NO20121371A patent/NO335964B1/no unknown
• 2013
  • 2013-11-18 CN CN201380060181.0A patent/CN104936858B/zh active Active
  • 2013-11-18 WO PCT/NO2013/050199 patent/WO2014077699A1/en active Application Filing
  • 2013-11-18 GB GB1509273.7A patent/GB2522166B/en active Active
  • 2013-11-18 KR KR1020157016511A patent/KR102130307B1/ko active IP Right Grant
• 2015
  • 2015-05-21 NO NO20150644A patent/NO20150644A1/en unknown

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