RU2426671C1 - Assembly comprising turret and releasing buoy - Google Patents

Assembly comprising turret and releasing buoy Download PDF

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Publication number
RU2426671C1
RU2426671C1 RU2010104619/11A RU2010104619A RU2426671C1 RU 2426671 C1 RU2426671 C1 RU 2426671C1 RU 2010104619/11 A RU2010104619/11 A RU 2010104619/11A RU 2010104619 A RU2010104619 A RU 2010104619A RU 2426671 C1 RU2426671 C1 RU 2426671C1
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RU
Russia
Prior art keywords
turret
buoy
annular groove
annular
annular protrusion
Prior art date
Application number
RU2010104619/11A
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Russian (ru)
Inventor
БАН Джейкоб ДЕ (NL)
БАН Джейкоб ДЕ
Original Assignee
Блюуотер Энерджи Сёвисиз Б.В.
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 Блюуотер Энерджи Сёвисиз Б.В. filed Critical Блюуотер Энерджи Сёвисиз Б.В.
Priority to RU2010104619/11A priority Critical patent/RU2426671C1/en
Application granted granted Critical
Publication of RU2426671C1 publication Critical patent/RU2426671C1/en

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Abstract

FIELD: transport.
SUBSTANCE: invention relates to offshore oil fields, particularly, to floating oil production, storage and handling systems. Proposed assembly comprises turret 2, releasing buoy 3. Turret bottom end and buoy top end are provided with fasteners that include ring ledge 4 running from turret or buoy toward buoy or turret, respectively, and annular groove 5 arranged on turret or buoy to accommodate said ledge. Width of kedge base 6 exceeds that of its top 7 while width of annular groove top 8 exceeds that of groove bottom 9.
EFFECT: reliable fastening between buoy and turret.
7 cl, 3 dwg

Description

The invention relates to an assembly comprising a turret and a detachable buoy, in which mating connecting means are provided at the lower end of the turret and at the upper end of the buoy.

In the offshore oil field, the so-called floating oil production, storage and unloading systems are used, which are vessels that are constantly or permanently anchored at the offshore oil field to receive hydrocarbons from the well, separate oil from water and gas, and store oil on board for subsequent unloading another ship. As a rule, floating oil production, storage and unloading systems are anchored by means of single turret anchor systems of internal or external type.

In some regions, the weather can deteriorate, for example due to hurricanes, so much so that the floating system for oil production, storage and unloading has to be disconnected from the anchor system and sent temporarily to calm waters. Similarly, in waters where there are many icebergs, sometimes you also need to disconnect from the anchor the floating oil production, storage and unloading system in order to avoid damage to the vessel.

In these cases, a detachable turret anchor system of the internal type (when the turret is installed inside the ship’s hull) or the external type (when the turret is installed in front of the bow of the vessel) is used, containing a detachable buoy in which mating connecting means are made on the lower end of the turret and on the upper end of the buoy .

In the design of the detachable turret system, particular attention is paid to the interface between the lower end of the turret and the upper end of the detachable buoy.

Ideally, this zone is pre-loaded in such a way as to prevent a gap between the turret and the buoy under the influence of external forces due to anchoring and sea waves.

Since the turret and buoy, as a rule, have a cylindrical or conical shape and a large diameter, it is important to connect them together so that they work as a whole. Another goal is to ensure a good fit of these structures in the mating zone, without resorting to a reduction in processing tolerances and, therefore, without increasing the cost of manufacture.

In known nodes, the upper end of the buoy is made conical and enters a correspondingly shaped conical recess at the bottom of the turret. Despite the fact that the conical mating zone makes it easy to mount the turret and the buoy on top of each other, the known nodes have a serious drawback, namely that the conical recess must be very strong and tough to withstand the radial loads resulting from the connection of the two components of the node . To exclude the possibility of separation of the buoy and turret under the influence of external loads caused by the anchoring and waves, a very significant preliminary load is required. If the required preload is not created, then the fasteners securing the buoy to the turret will experience large cyclic loads from anchoring and waves and as a result may fail prematurely.

The objectives of the invention are achieved by the fact that the proposed site containing the turret and detachable buoy, and at the lower end of the turret and at the upper end of the buoy mating connecting means are provided, characterized in that the connecting means comprise an annular protrusion extending from the turret or buoy respectively towards the buoy or turrets, and respectively made on a buoy or on a turret an annular groove of the corresponding form for placing an annular protrusion, while the width of the base of the annular protrusion is greater than the width of its apex, and Irina upper portion of the annular groove greater than the width of its bottom.

Preferred embodiments of the assembly are described in the dependent claims.

The annular protrusion and the annular groove are machined with such a tolerance that when they come into contact with each other under the action of axial force, one of these elements is deformed in the radial direction more than the other and takes its shape. As a result of the application of the nominal preload to the conjugation zone, both component parts of the assembly will work as a unit and will not tend to disconnect from one another.

The processing tolerances are selected so that under the action of compressive force, an increase in the diameter of the weakest part of the assembly, usually the lower end of the turret, is a percentage of the tangential elongation, not exceeding the yield strength of the material (steel) from which the turret and buoy are made. After reaching this stress level, a further increase in compressive force will only lead to an increase in local stresses in the radial section of the parts and an increase in contact stresses between them. This is a very rigid loading path, and the fasteners connecting the buoy to the turret form an integral part that creates a much less rigid loading path. Therefore, these fasteners do not experience significant cyclic loads.

Since very large contact stress arises on the tapering surfaces of the protrusion and groove, they can serve as a sealing device that prevents the penetration of sea water and allows the turret to be pumped out to dryness after the connection operation. An additional sealing element (for example, a ring of mild rubber or mild steel) may be installed between the annular protrusion and the annular groove.

Below the invention is described in detail with reference to the drawings, where:

figure 1 schematically shows a typical floating system of oil production, storage and unloading with an internal turret, anchored on the seabed in a known manner using a detachable buoy,

figure 2 schematically shows on a larger scale the interface between the turret and detachable buoy,

figure 3 schematically shows a variant with an additional sealing element.

Figure 1 shows a floating system of oil production, storage and unloading, equipped in a known manner with an internal turret 2, which at its lower end is connected to a detachable buoy 3. The buoy 3 is anchored on the seabed 4 through anchor cables 5, and the product pipeline 6 is connected to the well 7 and buoy 3 and then goes through the turret to the appropriate equipment (not shown) on board.

Figure 2 schematically shows a longitudinal section of the mating zone of the lower end of the turret 2 and the upper end of the buoy 3 before assembly. The upper end of the buoy 3 has an annular protrusion 4 extending from it, and the lower end of the turret has an annular groove 5 of the corresponding shape for receiving the annular protrusion 4. The annular protrusion has a base 6, the width of which is greater than the width of its top 7, and the width of the upper part (open side) 8, the grooves are larger than the width of its bottom 9. In the shown embodiment, the annular protrusion and the annular groove have a trapezoidal cross section. As a result, the assembly of these elements is greatly simplified (i.e., the introduction of the annular protrusion 4 into the annular groove 5) and the optimal load distribution between the turret 2 and the buoy 3 is ensured.

It is also possible that the annular protrusion is part of the turret and the annular groove is made in the buoy. In addition, the number of annular protrusions with corresponding annular grooves may be greater than one, in which case both the turret and buoy will contain at least one annular protrusion and at least one annular groove.

The presence of an annular protrusion and an annular groove does not exclude the fact that the lower end of the turret 2 and the upper end of the buoy can have a conical shape (shown schematically by dashed lines in figure 2), as in the known devices.

Figure 3 shows on an enlarged scale a sealing element 10 mounted between the annular protrusion 4 and the annular groove 5, more precisely, between the top 7 of the protrusion 4 and the bottom 9 of the groove 5, and preferably attached to the bottom 9 of the groove. The sealing element may be a soft rubber or mild steel ring.

The invention is not limited to the described options for its implementation and allows various changes of these options within the scope defined by the attached formula.

Claims (7)

1. An assembly comprising a turret and a detachable buoy, mating connecting means provided at the lower end of the turret and at the upper end of the buoy, characterized in that the connecting means comprise an annular protrusion extending from the turret or buoy respectively towards the buoy or turret, and made respectively on a buoy or on a turret, an annular groove of the appropriate shape to accommodate the annular protrusion, while the width of the base of the annular protrusion is greater than the width of its apex, and the width of the upper part of the annular groove is greater Irina its bottom.
2. The device according to claim 1, in which the annular protrusion and the annular groove have a trapezoidal cross section.
3. The device according to claim 1 or 2, in which the annular protrusion is made on the buoy, and the annular groove is made on the turret.
4. The device according to claim 1, in which between the annular protrusion and the annular groove is a sealing element.
5. The device according to claim 4, in which the sealing element is located between the top of the annular protrusion and the bottom of the annular groove.
6. The device according to claim 5, in which the sealing element is attached to the bottom of the annular groove.
7. The device according to any one of claims 4 to 6, in which the sealing element is a ring of plastic rubber or mild mild steel.
RU2010104619/11A 2007-07-16 2007-07-16 Assembly comprising turret and releasing buoy RU2426671C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2010104619/11A RU2426671C1 (en) 2007-07-16 2007-07-16 Assembly comprising turret and releasing buoy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2010104619/11A RU2426671C1 (en) 2007-07-16 2007-07-16 Assembly comprising turret and releasing buoy

Publications (1)

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RU2426671C1 true RU2426671C1 (en) 2011-08-20

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RU2010104619/11A RU2426671C1 (en) 2007-07-16 2007-07-16 Assembly comprising turret and releasing buoy

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2475407C1 (en) * 2011-11-10 2013-02-20 Российская Федерация, от имени которой выступает государственный заказчик Министерство промышленности и торговли Российской Федерации (Минпромторг России) Marine semisubmersible helideck
RU2568006C2 (en) * 2014-03-27 2015-11-10 Российская Федерация, от имени которой выступает государственный заказчик (Министерство промышленности и торговли Российской Федерации) Drill ship positioning anchor system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2475407C1 (en) * 2011-11-10 2013-02-20 Российская Федерация, от имени которой выступает государственный заказчик Министерство промышленности и торговли Российской Федерации (Минпромторг России) Marine semisubmersible helideck
RU2568006C2 (en) * 2014-03-27 2015-11-10 Российская Федерация, от имени которой выступает государственный заказчик (Министерство промышленности и торговли Российской Федерации) Drill ship positioning anchor system

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