CN113217752A - Buckle-in buckle arrestor with vortex-induced vibration suppression function - Google Patents
Buckle-in buckle arrestor with vortex-induced vibration suppression function Download PDFInfo
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- CN113217752A CN113217752A CN202110519153.7A CN202110519153A CN113217752A CN 113217752 A CN113217752 A CN 113217752A CN 202110519153 A CN202110519153 A CN 202110519153A CN 113217752 A CN113217752 A CN 113217752A
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- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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Abstract
本发明公开了一种具有涡激振动抑制功能的扣入式止屈器，包括由两瓣对称抱合的壳体拼扣后形成的整体轮廓类似豆荚的外壳，其外表面沿轴向方向呈简谐波型变化；在对称抱合的两瓣壳体的轴向的中间及两端分别通过扣合固定结构使得外壳紧密的抱合在海底管道上；每个外壳在轴向方向上包括两个波峰和三个波谷，波高与波长之比大于0.05，波峰形成具有圆形横截面的VIV抑制段，波谷形成与海底管道紧密结合的止屈段；止屈器内径与海底管道外表面之间的缝隙不超过海底管道外径的1～2％。本发明不仅能够有效抑制不同来流方向下海底管道的涡激振动，还可以阻止管道在生命周期中可能发生的屈曲传播，从而实现了功能整合和简化设计的统一，同时降低了生产成本。
The invention discloses a snap-in buckling stopper with vortex-induced vibration suppression function. Harmonic type change; in the axial middle and both ends of the symmetrically coherent two-lobed shell, the shell is tightly hugged on the submarine pipeline by the fastening structure; each shell in the axial direction includes two wave crests and Three wave troughs, the ratio of wave height to wavelength is greater than 0.05, the wave crest forms a VIV suppression section with a circular cross-section, and the wave trough forms a flexure stop section closely combined with the submarine pipeline; the gap between the inner diameter of the buckling stopper and the outer surface of the submarine pipeline is not large. More than 1 to 2% of the outer diameter of the submarine pipeline. The invention can not only effectively suppress the vortex-induced vibration of the submarine pipeline under different inflow directions, but also prevent the buckling propagation that may occur during the life cycle of the pipeline, thereby realizing the unification of function integration and simplified design, and reducing the production cost.
Description
Technical Field
The invention relates to a novel buckling type buckle arrestor with a vortex-induced vibration suppression function, and belongs to the field of marine pipeline engineering.
Background
In recent years, with the rapid and continuous development of global economy, people gradually increase the exploitation and utilization of marine oil and gas resources. In facilities and equipment for exploiting and transporting marine oil and gas resources, a submarine pipeline can efficiently and quickly transport resources such as petroleum and natural gas produced by a submarine oil well to the land, and the submarine pipeline has the advantages of convenience in installation, low manufacturing cost, efficient transportation and the like. Submarine pipelines have become key components of marine oil and gas resource transportation systems, and are the main arteries for the transportation of submarine energy substances.
1. Buckling propagation and buckle arrestor for subsea pipelines
Due to the huge external pressure of deep sea and complex working environment, the submarine pipeline may be locally crushed under the action of local defects and external loads, and further buckling propagation is formed to cause large-scale failure of the pipeline. For a deep sea pipeline, the external pressure for maintaining the buckling propagation is usually much smaller than the external pressure for inducing the local buckling, so once the submarine pipeline with the pipeline critical crushing pressure as the maximum external pressure is locally crushed, the buckling propagation cannot be resisted only by the structural strength of the pipeline. Theoretically, the buckling propagation critical pressure of the pipeline can be effectively increased by adopting a mode of increasing the wall thickness of the pipeline, but the use amount of steel and the weight of the pipeline are greatly increased, the engineering construction cost is increased, and the method is not feasible economically. An effective and economical way of inhibiting the propagation of buckling in a subsea pipeline is to provide Buckle arrestors (Buckle Arrestors) at a distance along the length of the pipeline. The working principle is to allow the pipeline to generate local buckling, but the buckling propagation cannot cross the buckle arrestor, so that the local buckling only occurs between the two buckle arrestors. The buckle arrestor can not avoid the local buckling of the pipeline to a certain extent, but well keeps the integrity of the pipeline, obtains better balance in safety and economy and reduces the risks of large-scale failure of the pipeline and potential economic loss of an owner.
The effective buckle arrestor is designed to successfully prevent the transmission of pipeline buckling in the working range, the common form is a thick-wall ring and a winding bar, and the buckle arrestor can be generally divided into a buckling type buckle arrestor, a common welding type arrestor, an integral arrestor and a winding arrestor according to different installation modes.
2. Vortex-induced vibration suppression for subsea pipelines
Pipelines located on the sea bottom may be influenced by sea currents, and when fluid bypasses the surface of the pipelines, vortex shedding alternately occurs at the rear parts of the pipelines due to fluid viscosity and the like; the Vortex motion of the alternating shedding can make the cylinder subject to a series of pulsating transverse acting forces (lifting forces), and the direction of the lifting forces is changed alternately along with the shedding of the Vortex, thereby causing the Vibration on the whole structure of the pipeline (VIV). Under specific conditions, particularly when the shedding frequency of a vortex formed after an incoming flow bypasses a cylinder is close to the natural frequency of a pipeline structure, the interaction between the incoming flow and the pipeline easily causes structural resonance, the amplitude of pipeline oscillation is sharply increased, the structural fatigue damage is caused, the structural damage such as pipeline fracture, local collapse and the like is caused over time, and the corresponding production activity is further influenced or even production is stopped. Therefore, how to strengthen the structure, effectively reduce the hydrodynamic load on the structure, and weaken or eliminate the vortex-induced vibration on the structure becomes a problem to be considered in pipeline design.
The conventional vortex-induced vibration suppression device comprises a spiral strake, a fin-shaped fairing, a twisted column and the like, wherein the spiral strake has a good suppression effect on vortex-induced vibration in a fixed incoming flow direction, is low in manufacturing cost and has the defect of generating large fluid resistance; the whole suppression effect of the fairing is good, but the design is complex and the manufacturing cost is high; the twisted column body can only adapt to the working condition of one incoming flow direction, and the adaptability is poor. Chinese patent publication No. CN102207118A, published as 2011, 10/5, describes a pod-type vortex-induced vibration suppression device, which mainly includes several sections of shells with circular cross sections, the outer surface of the shell changes in a simple harmonic mode along the span direction of the pipeline, and the device has a good effect of suppressing vortex-induced vibration in different incoming flow directions.
Considering that the fatigue damage generated by vortex-induced vibration is also one of the reasons for local crushing and buckling propagation failure of the pipeline, the submarine pipeline vortex-induced vibration suppression device and the pipeline buckle arrestor are combined, and the buckle arrestor with the vortex-induced vibration suppression function has practical and effective engineering significance and can play the roles of simplifying design and reducing cost.
Disclosure of Invention
In view of the above prior art, the main object of the present invention is to provide a local reinforcement device combining a buckle-in buckle arrestor with a pod-type vortex-induced vibration suppression device, which not only can effectively suppress vortex-induced vibrations of submarine pipelines in different incoming flow directions, but also can prevent the propagation of buckling that may occur in the pipeline during the life cycle, thereby achieving the unification of function integration and simplified design, and reducing the production cost at the same time.
In order to solve the technical problem, the invention provides a buckling buckle-in buckle arrestor with a vortex-induced vibration suppression function, which comprises a plurality of shells with the same structure and fixed in the axial direction of a submarine pipeline, wherein each shell is formed by splicing and buckling two symmetrically-clasped shells, the overall profile of each shell is similar to a bean pod, and the outer surface of each shell changes in a simple harmonic mode along the axial direction of the pipeline; buckling and fixing structures are respectively arranged at the axial middle position and the two end positions of the two symmetrically-clasped shell bodies, and the shells are tightly clasped on the submarine pipeline through the buckling and fixing structures; each shell has a complete simple harmonic length in the axial direction, and comprises two wave crests and three wave troughs, the ratio of the wave height to the wave length is more than 0.05, the wave crests form a vortex-induced vibration (VIV) inhibition section with a circular cross section, and the wave troughs form an anti-buckling section tightly combined with the submarine pipeline; the inner diameter of the buckling-stopping section is D, the outer diameter of the submarine pipeline is D, and D-D is not more than (1-2) × D/100.
Further, the buckle-in buckle arrestor of the present invention is provided with:
the thickness of the buckling-stopping section of the shell is gradually increased along with the expansion of the surface of the shell, and the buckling and fixing structure adopts a hoop or a welding form.
Cement, sand-mixed epoxy resin and polyurethane are poured into gaps of the joint parts of the shell and the submarine pipeline for filling, welding seams are reserved at the end parts of the shell, and the two ends of the shell are welded on the surface of the submarine pipeline during installation, so that the buckling-stopping performance is improved, and the possibility of U-shaped crossing is reduced.
The shell is made of steel, and the surface of the shell is coated with an anti-corrosion coating.
Compared with the prior art, the invention has the beneficial effects that:
(1) the buckling propagation of the submarine pipeline after local buckling can be effectively prevented, the integral integrity of the submarine pipeline is ensured, and the risk of large-range failure of the submarine pipeline is greatly reduced;
(2) the pod-type shell can effectively inhibit vortex-induced vibration which may occur in a submarine pipeline under the impact of ocean currents, and the unique shape of the pod-type shell not only can adapt to incoming currents in different directions, but also can reduce hydrodynamic load borne by the structure to a certain extent;
(3) the whole structure is assembled by two parts which are symmetrical, the processing and manufacturing difficulty of the buckle arrestor is reduced, and batch production can be carried out by adopting a casting or even stamping mode, so that the manufacturing process is simplified, and the manufacturing cost is reduced.
Drawings
Fig. 1 is a sectional view of the novel buckle arrestor designed according to the present invention after installation;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
fig. 4 and 5 are a three-dimensional schematic and a perspective view, respectively, of the present invention.
In the figure: 1-submarine pipeline, 2-buckle-stopping section, 3-VIV restraining section and 4-buckling fixing structure.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
The invention provides a buckling buckle-in buckle arrestor with a vortex-induced vibration suppression function, which comprises a plurality of shells with the same structure, wherein the shells are fixed in the axial direction of a submarine pipeline (1), as shown in fig. 1, each shell is formed by splicing and buckling two symmetrically-clasped shells, the overall outline of each shell is similar to a bean pod, and the outer surface of each shell changes in a simple harmonic wave mode along the axial direction of the pipeline, as shown in fig. 4 and 5; the middle position and the two end positions of the two symmetrically-clasped shell bodies in the axial direction are respectively provided with a buckling fixing structure 4, the buckling fixing structures 4 adopt hoop or welding forms, and the shell is tightly clasped on the submarine pipeline 1 through the buckling fixing structures 4. Each shell has one complete simple wave length in the axial direction, comprising two peaks and three troughs, the ratio of the wave height to the wave length being greater than 0.05, said peaks forming a VIV suppression section 3 with a circular cross section, as shown in fig. 2; as shown in fig. 1 and 3, the wave troughs form buckle-preventing sections 2 tightly combined with the submarine pipeline 1, and the snap-fit fixing structures 4 are located at the wave troughs with the smallest diameter of the shells, so that each shell has two sections of VIV suppressing sections 3 with circular cross sections and buckle-preventing sections 2 tightly combined with the submarine pipeline 1. The inner diameter of the buckle arrestor section 2 is D, the outer diameter of the submarine pipeline 1 is D, D-D is less than or equal to (1-2) × D/100, namely, a gap between the inner diameter of the buckle arrestor and the outer surface of the submarine pipeline is not more than 1-2% of the outer diameter of the submarine pipeline. As shown in fig. 1 and 4, the thickness of the buckle stop section 2 of the housing gradually increases as the surface of the housing expands, thereby achieving higher self-strength while saving material.
Because the shell adopts the symmetrical design, only need the mode water-flowing operation through casting or punching press when processing and manufacturing two lamella casings, during the installation, close fixed knot structure 4 through the lock of predesign in the trough position and close two parts of casings as an organic whole. The fastening fixing structure 4 can adopt an eye plate extending out from the hoop in a positioning way, and a bolt passes through the eye plate to connect the two shells into a whole and cling to the outer surface of the submarine pipeline 1. The gap between the two shells is filled with a binder such as sand-mixed epoxy resin and polyurethane, and is strictly sealed, or the gap between the two shells can be processed by welding. The buckling and fixing structure 4 adopts a welding form, welding seams are reserved at the end parts of the shells, and the two ends of the shells are welded on the surface of the submarine pipeline 1 during installation, so that the buckling and fixing performance is improved, and the possibility of U-shaped crossing is reduced. The shell is made of steel, and the surface of the shell is coated with an anti-corrosion coating.
As shown in fig. 4, the tight combination part of the trough of the buckle-in buckle arrestor and the outer surface of the submarine pipeline 1 is the part which plays the role of buckling arrest, the buckling arrest section 2 is tightly combined with the submarine pipeline 1, and the tiny gap between the inner diameter of the buckle arrestor and the outer surface of the submarine pipeline is filled by pouring cement, sand-mixed epoxy resin, polyurethane and the like. The wall thickness of the buckle arrestor section 2 will gradually increase along with the expansion of the shell within a certain distance, so that higher self-strength can be obtained even with a smaller length of the buckle arrestor. Welding seams can be reserved at two ends of each shell, two ends of the buckle arrestor are firmly welded to the outer surface of the submarine pipeline 1 in the installation process, and the buckle arrestor is similar to a common welding buckle arrestor and can limit the submarine pipeline 1 from U-shaped crossing to the maximum extent, so that better buckle arrestor performance is achieved. Meanwhile, as the whole structure of the shell of the invention shares three parts in close contact with the pipeline along the axial direction, even if one buckle-arresting section fails, the rest two buckle-arresting sections can also play the role of 'secondary buckle arrest', thereby increasing the buckle-arresting performance of the submarine pipeline 1.
While the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are illustrative only and not restrictive, and various modifications which do not depart from the spirit of the present invention and which are intended to be covered by the claims of the present invention may be made by those skilled in the art.
Claims (5)
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| CN202110519153.7A CN113217752B (en) | 2021-05-12 | 2021-05-12 | A snap-in buckling stopper with vortex-induced vibration suppression function |
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| CN202110519153.7A CN113217752B (en) | 2021-05-12 | 2021-05-12 | A snap-in buckling stopper with vortex-induced vibration suppression function |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696751A (en) * | 2009-11-13 | 2010-04-21 | 天津大学 | Method for preventing buckle propagation and inhibiting vortex-induced vibration of benthal pipeline |
| CN102207118A (en) * | 2011-05-26 | 2011-10-05 | 中国海洋石油总公司 | Pod-type vortex-induced vibration suppression device |
| CN102278530A (en) * | 2011-08-02 | 2011-12-14 | 天津大学 | Submarine pipeline buckle arrestor with guide plates |
| CN102359661A (en) * | 2011-08-22 | 2012-02-22 | 天津大学 | Method for manufacturing and fixing submarine pipeline buckle arrestor on basis of morphological energy adsorption |
| EP2691683A1 (en) * | 2011-03-31 | 2014-02-05 | The Safer Plug Company Limited | An autonomous pipeline buckle arresting isolation tool |
| CN203515368U (en) * | 2013-10-23 | 2014-04-02 | 西南石油大学 | Riser vortex inducting vibration suppression device with rough undulating surface |
| CN107742039A (en) * | 2017-10-31 | 2018-02-27 | 合肥通用机械研究院 | A kind of Submarine Pipeline Design method based on suspended span vortex-induced vibration fatigue life |
-
2021
- 2021-05-12 CN CN202110519153.7A patent/CN113217752B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| CN101696751A (en) * | 2009-11-13 | 2010-04-21 | 天津大学 | Method for preventing buckle propagation and inhibiting vortex-induced vibration of benthal pipeline |
| EP2691683A1 (en) * | 2011-03-31 | 2014-02-05 | The Safer Plug Company Limited | An autonomous pipeline buckle arresting isolation tool |
| CN102207118A (en) * | 2011-05-26 | 2011-10-05 | 中国海洋石油总公司 | Pod-type vortex-induced vibration suppression device |
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| CN102359661A (en) * | 2011-08-22 | 2012-02-22 | 天津大学 | Method for manufacturing and fixing submarine pipeline buckle arrestor on basis of morphological energy adsorption |
| CN203515368U (en) * | 2013-10-23 | 2014-04-02 | 西南石油大学 | Riser vortex inducting vibration suppression device with rough undulating surface |
| CN107742039A (en) * | 2017-10-31 | 2018-02-27 | 合肥通用机械研究院 | A kind of Submarine Pipeline Design method based on suspended span vortex-induced vibration fatigue life |
Non-Patent Citations (2)
| Title |
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| SONG LEIJIAN，等: "Hydrodynamic Forces and Coefficients on Flexible Risers Undergoing Vortex-Induced Vibrations in Uniform Flow", 《JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING》 * |
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