KR20170000730U

KR20170000730U - Mooring line systems for corrosion protection

Info

Publication number: KR20170000730U
Application number: KR2020150005509U
Authority: KR
Inventors: 이창현; 전석희; 오영태
Original assignee: 대우조선해양 주식회사
Priority date: 2015-08-18
Filing date: 2015-08-18
Publication date: 2017-02-28

Abstract

The present invention relates to a mooring line used in a mooring system of an offshore structure, which is made of a metal material and is continuously connected with an annular ring including a long hole, and is characterized by comprising a chain without a stud and a metal And an anode attached to each annular ring of the chain.
According to the present invention, by attaching the anode to the studless chain, the corrosion can be prevented, thereby ensuring structural safety. At the end of the life of the anode, the core can be removed from the steel plate to attach another anode, which is convenient for maintenance.
It is possible to improve the fatigue life of the chain and to use it as the design margin of the fatigue life because it can provide the basis for applying the effective cross-sectional area of the chain to 50% or more when examining the fatigue life of the studless chain of the present invention .

Description

[0001] Mooring line systems for corrosion protection [

The present invention relates to a mooring line of a ship, and more particularly, to a system for preventing corrosion of a mooring line.

Generally, the chain is formed by joining the joints of the chain unit after the chain unit connects the annular rings one by one, thereby forming a long chain in the longitudinal direction. Such a chain is configured by connecting long-hole type rings, and is widely used in winches and guide rails of various heavy equipment, parking lots, and elevator fields.

Such a chain is generally made of a metal material, which is easily corroded over time and has a characteristic that the touch itself is cold. In addition to the FPSO, which once installed, does not move until the life of the ship is complete, And is also widely used in mooring systems to maintain position in moving marine drill rigs.

Since the mooring line, which is one of the components of the mooring system, is very vulnerable to corrosion because it is immersed in seawater, it is very important to ensure the structural safety of the mooring line by preventing corrosion. The mooring line is mainly used for studless chain, stud chain, steel wire or wire rope, but it is difficult to apply relatively heavy stud chain as the water depth increases.

The Studless chain has a limitation that the structural safety is not good because it is corroded by seawater. When considering the fatigue life of the mooring line, the class of ship is considered to have effective cross-sectional area of only 50% The diameter of the chain in design is bound to increase. As the diameter of the chain increases, production and installation costs increase. Therefore, it is advantageous to use a chain having a small diameter.

Korean Registered Patent No. 1231832 (Announced on Mar. 02, 2013)

The object of the present invention is to provide a chain mooring line which is small in size and can be prepared for corrosion in order to solve the above-mentioned problems.

In order to achieve the above object, a mooring line used in a mooring system for an offshore structure according to an embodiment of the present invention is made of a metal material, and an annular ring including long holes is continuously connected, And an anode which is made of a metal having a higher reducing power than the metal forming the chain and is attached to each annular ring of the chain.

Wherein the annular shape of the chain is formed by separating two semicircles and connected by two straight lines, a pair of metal plates attached to each of the straight lines and positioned to face each other in the chain, And the anode may be coupled to penetrate through the core.

The protector may further include a protector that connects the metal plate in a straight line and is provided on both sides of the anode to protect the anode from an external impact.

As a method for attaching the metal plate to the chain, welding may be used.

The material of the anode is aluminum or zinc. When the anode is corroded, it can be replaced with a new anode.

According to another embodiment of the present invention, the annular shape of the chain is a shape in which two semicircles are separated from each other and connected by two straight lines, and a metal attached to a section corresponding to a straight line of the outer circumference of the chain A plate, and a steel core formed on the metal plate and extending toward the outside of the chain, and the anode may be coupled to penetrate through the core.

According to another aspect of the present invention, there is provided a mooring system for an offshore structure, comprising: a mooring line made of a metal material, the mooring line comprising an annular ring continuously including long holes, And a pair of anodes each of which is made of a metal having a higher reductive power than the metal forming the chain and connected to the ring where the mooring line starts and the ring where the mooring line ends.

Further, when the anode is corroded, it can be replaced with a new anode.

According to the present invention, by attaching the anode to the studless chain, the corrosion can be prevented, thereby ensuring structural safety. At the end of the life of the anode, the core can be removed from the steel plate to attach another anode, which is convenient for maintenance.

It is possible to improve the fatigue life of the chain and to use it as the design margin of the fatigue life because it can provide the basis for applying the effective cross-sectional area of the chain to 50% or more when examining the fatigue life of the studless chain of the present invention .

1 shows a chain mooring line according to the prior art.
2 shows a mooring line according to an embodiment of the present invention.
3 shows a mooring line including a protector.
4 shows a mooring line according to an embodiment of the present invention.
5 shows a mooring system according to an embodiment of the present invention.
6 shows a mooring system including a waterproof membrane.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the embodiments of the present invention.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) can be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

Figure 1 shows a chain 10 according to the prior art. The mooring line according to the prior art consists of a chain 10 without a stud, which is advantageous in that it is lighter than the chain 10 with a stud and has a simple structure, but still has no solution against corrosion. Considering that the mooring line is corroded, it is necessary to use a chain 10 thicker than the thickness of the chain 10 required on the assumption that there is no corrosion, which causes the weight of the mooring line to become heavy, increase the production cost, .

2 shows a mooring line according to an embodiment of the present invention. FIG. 2 (a) is a front view of the loop of the chain 10 forming a mooring line, and FIG. 2 (b) is a view of the chain 10 from above. Will be described with reference to the drawings. The chain (10) is made of a metal material, and the annular ring including the long hole is continuously connected, and the structure is free from the stud. The mooring line is normally submerged in seawater, so it is easily eroded and corrosion is accelerated at a high rate.

Accordingly, a metal having a higher reductive power than the metal material forming the mooring line is attached to each ring of the chain 10 in consideration of this. This is defined as the anode 40, and the anode 40 is oxidized before the metal forming the mooring line, and oxidation of the mooring line occurs after the anode 40 is oxidized.

Therefore, if the mooring line is made of a steel material, the anode 40 can be made of metal which is more likely to be oxidized, that is, aluminum or zinc whose reducing power is higher than that of iron.

Since the reducing power of the metal is relatively comparative, the material of the anode 40 can be selected flexibly depending on the material of the mooring line.

A plate (20) is attached to the inside of the ring constituting the chain (10). The plates 20 are attached along the inner perimeter of the hooks of the chain 10, made up of pairs, and positioned to face each other. The plate 20 may be attached to the straight section as shown in FIG. 2 as a specific example, although it is not particularly limited as long as the plate 20 is located inside the chain of the chain 10. The method of attaching the plate 20 to the chain 10 is not particularly limited, but welding can be used in one embodiment.

That is, the annular shape of the chain 10 is a shape in which two semicircles are separated from each other and connected by two straight lines. The plate 20 is attached to each straight line, and is positioned to face the inside of the chain 10 .

The core (30) is made of a metal material with a structure in which the plate (20) is linearly connected. The material of the metal is not particularly limited, but it should be a metal material having a lower reducing power than that of the anode 40, and usually steel can be used. The number of the cores 30 is not particularly limited and must be at least one. In FIG. 2, two cores 30 are shown, and the core 30 penetrates the anode 40. That is, the anode 40 is coupled to the chain 10 in the form of penetrating the core 30.

In addition, since the anode 40 is corroded before the chain 10, the lifetime can be checked to the extent that the anode 40 is corroded. Also, by separately replacing the anode 40, the chain 10 can be protected from corrosion.

3 shows a mooring line including the protector 50. As shown in Fig. The protector 50 connects the plate 20 in a straight line and is installed on both sides of the anode 40 to protect the anode 40 from external impacts. When multiple chains (10) are connected and moving, collisions can occur between the rings, and when the mooring line is submerged in seawater, it can be impacted by objects in the sea. Therefore, a separate protector 50 can be attached to protect the anode 40 from such a physical impact.

4 shows a mooring line according to an embodiment of the present invention. Referring to the drawings, the chain 10 is made of a metal material, and annular rings including long holes are continuously connected and have no studs. The annular shape of the chain 10 is a shape in which two semicircles are separated from each other and connected by two straight lines and a second plate 21 attached to a section corresponding to a straight line of the outer circumference of the chain 10 is formed do.

The second plate (21) is formed with a second core (31) made of steel and extending toward the outside of the chain (10). Although the number of the second plate 21 and the number of the second cores 31 is not particularly limited, an exemplary second plate 21 and two second cores 31 are illustrated in the drawing. The second anode 41 is coupled to penetrate due to the second core 31.

4 differs from the above embodiment in that the embodiment shown in Fig. 4 does not include a separate protector 50 and the second anode 41 is disposed around the outer periphery of the chain 10, Is located in the inner periphery of the chain (10).

5 shows a mooring system according to an embodiment of the present invention. In the mooring system for an offshore structure, a mooring line made of a metal material and composed of a chain (10) in which annular rings including long holes are continuously connected, and a chain (10) And a pair of third anodes (42), each of which is made of a metal having a higher reducing power than that of the metal, and is connected to the ring where the mooring line starts and the end of the mooring line.

Compared with the above-described embodiment, in the above-described embodiment, the third anode 42 is provided for each annulus of the chain 10, but the embodiment according to Fig. 5 is applicable only to the chain 10 ring There is a difference that the third anode 42 is connected. The basic principle of using a metal having a higher reducing power than the metal forming the chain 10 as the third anode 42 is the same, but the ring constituting the chain 10 is always kept in a contact state, have. Therefore, the same purpose and effect can be achieved even if the third anode 42 is not provided for each ring of the chain 10 and the third anode 42 is connected only to the chain 10 corresponding to the start and end of the mooring line .

Since the start and end of the mooring line may be the shore branches or hulls, respectively, it is advantageous that the third anode 42 can be replaced and managed more conveniently.

Fig. 6 shows a mooring system including a waterproof membrane 60. Fig. Referring to the drawings, the waterproof membrane 60 surrounding the mooring line is provided to prevent contact between the mooring line and seawater, thereby preventing corrosion. If the thickness of the chain 10 is determined on the assumption that the mooring line is not corroded, the volume of the chain 10 can be considerably reduced, so that it is easy to provide the waterproofing membrane 60.

The mooring line can be oxidized in the air even if the waterproof membrane 60 is provided. Therefore, as shown in FIG. 5, the third anode 42 is connected to the chain 10 corresponding to the start and end of the mooring line, And the oxidation speed of the third anode 42 can be reduced.

As described above, the present invention is not necessarily limited to these embodiments because all the constituent elements constituting the embodiment of the present invention are described as being combined or operated as a single unit. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal unless expressly defined in the art.

The description above is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in this specification are intended to illustrate rather than limit the technical idea of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

10: Chain
20: Plate
21: second plate
30: Core
31: second core
40: anode
41: Second anode
42: Third anode
50: Protector
60: Waterproof membrane
100, 200, 300, 400, 500: Mooring system

Claims

In a mooring line used for a mooring system of an offshore structure,
A chain made of a metal material, in which an annular ring including a long hole is continuously connected, without a stud; And
An anode formed of a metal having a higher reducing power than the metal forming the chain and attached to each annular ring of the chain;
And the mooring line.

The method according to claim 1,
The annular shape of the chain is a pair of metal plates which are separated from each other by two semicircles and connected by two straight lines and attached to each of the straight lines and positioned so as to face each other in the chain; And
A steel core that connects the metal plate in a straight line;
Wherein the anode is coupled to penetrate through the core.

3. The method of claim 2,
Further comprising a protector connected to the metal plate in a straight line and provided on both sides of the anode to protect the anode from external impacts.

3. The method of claim 2,
Wherein the metal plate is attached to the chain by welding.

The method according to claim 1,
And the material of the anode is aluminum or zinc.

The method according to claim 1,
Wherein when the anode is corroded, it can be replaced with a new anode.

The method according to claim 1,
The annular shape of the chain is formed by separating two semicircles and connected by two straight lines, and is attached to a section corresponding to a straight line of the outer circumference of the chain; And
A steel core formed on the metal plate and extending toward the outside of the chain;
Wherein the anode is coupled to penetrate through the core.

In the mooring system of an offshore structure,
A mooring line made of a metal material, the mooring line consisting of a chain in which an annular ring including a long hole is continuously connected, and a stud-free chain; And
A pair of anodes formed of a metal having a higher reductive power than the metal forming the chain and connected to a ring where the mooring line starts and a ring where the mooring line ends;
The mooring system comprising:

9. The method of claim 8,
Wherein the anode can be replaced with a new anode when the anode is corroded.