CN108118343A - The impressed current of jacket platform and sacrificial anode Combined Protection device and method - Google Patents

Abstract

The invention relates to an applied current and sacrificial anode combined protection device and method for a jacket platform. The device includes an impressed current cathodic protection system and a sacrificial anode; the impressed current cathodic protection system includes a control power supply, an integrated tension cable, an auxiliary anode and a weight; one end of the integrated tension cable is connected to the weight, and the other end is stretched to the jacket The upper part of the platform is divided into tensile steel cables and cables through the junction box; the tensile steel cables are fixed on the jacket platform, the output positive pole of the control power supply is connected to the cable, and the output negative pole is connected to the jacket platform; the integrated tension cable A number of auxiliary anodes connected in parallel are installed on the part submerged in seawater; a number of sacrificial anodes are evenly fixed on the jacket platform. The invention has simple structure, convenient installation, saves the consumption of sacrificial anode, reduces cathodic protection cost, reduces platform load and reduces pollution caused by metal ion dissolution.

Description

Impressed current and sacrificial anode combined protection device and method for jacket platform

technical field

The invention belongs to the technical field of marine metal anticorrosion, and in particular relates to a combined protection device and method for an applied current and a sacrificial anode of a jacket platform.

Background technique

The jacket platform is currently the most widely used offshore oil platform in offshore engineering, and generally consists of a superstructure and a foundation structure. The superstructure is generally composed of the upper and lower platform decks and living and production modules; the base structure (ie, the substructure) includes jackets and piles. These structures are generally steel structures. As seawater is a strong corrosive medium, if effective anti-corrosion measures are not taken, the jacket platform will suffer corrosion damage in the harsh marine environment, which will affect the life of the platform and safe production, and increase the maintenance cost of the platform.

The corrosion control of the jacket platform generally adopts the sacrificial anode cathodic protection method. This method has the advantages of no external power supply, less post-maintenance, and no danger of over-protection, and is widely used in small and medium-sized jacket platforms. However, since there is no coating on the surface of the jacket platform, an initial polarization process is required in the cathodic protection process, which requires a large initial protection current, and the protection current rapidly decreases to 1/ of the initial protection current after the polarization is completed and the calcium and magnesium deposition layer is formed. Around 3, excessive sacrificial anodes are often used to meet the initial protection current requirements during design. On the one hand, it causes a waste of resources, and on the other hand, it also increases the platform load, resulting in an increase in construction costs. In the prior art, there is no report on the technical content of the sacrificial anode cathodic protection that can perform initial rapid polarization and thus quickly form a dense calcium and magnesium deposition layer.

Contents of the invention

The purpose of the present invention is to provide an applied current and sacrificial anode combined protection device and method for the jacket platform, which can perform initial rapid polarization and quickly form a dense calcium and magnesium deposition layer, has a simple structure, is easy to install, and saves the amount of sacrificial anodes , reduce cathodic protection costs, reduce platform load, and reduce pollution caused by metal ion dissolution.

In order to achieve the above object, the present invention provides the following technical solutions:

The present invention provides an impressed current and sacrificial anode combined protection device for a jacket platform, including an impressed current cathodic protection system 12 and a sacrificial anode 10;

The impressed current cathodic protection system 12 includes: a control power supply 1, an integrated tension cable 6, an auxiliary anode 7 and a weight 9;

One end of the integrated tensile cable 6 is connected to the weight 9 placed on the seabed, and the other end is stretched to the upper part of the jacket platform 11, and is divided into a tensile steel cable 4 and a cable 2 through a junction box 5;

The tensile steel cable 4 is fixed on the jacket platform 11, the output positive pole of the control power supply 1 is connected to the cable 2, and the output negative pole is connected to the jacket platform 11;

A plurality of auxiliary anodes 7 connected in parallel are installed on the part of the integrated tension cable 6 submerged in seawater. The auxiliary anodes 7 are operated with an applied current at the initial stage of operation of the jacket platform, and a dense deposition layer is formed on the surface of the jacket After reducing or closing the current;

Multiple sacrificial anodes 10 are evenly fixed on the jacket platform 11 .

The cable 2 is a multi-core cable, each conductor core of the cable 2 is connected to an auxiliary anode 7, and the control power supply 1 supplies power to each auxiliary anode 7 via each conductor core of the cable 2.

The integrated tensile cable 6 is a composite cable integrated with the cable 2 and the tensile steel cable 4 .

The sacrificial anode 10 is an aluminum-based sacrificial anode, and the junction box 5 is made of seawater-resistant stainless steel.

The integrated tensile cable 6 is connected to the weight 9 through the connecting buckle 8; the material of the connecting buckle 8 is duplex stainless steel or titanium; the weight 9 is a reinforced concrete structure, and the steel bar is welded with a sacrificial anode to prevent corrosion, and the concrete The exterior is painted with a seawater resistant coating.

The impressed current cathodic protection system 12 is installed outside the jacket platform 11 , or installed inside the jacket platform 11 .

The invention provides a method for combined protection of an applied current and a sacrificial anode using the jacket platform of the device, comprising the following steps:

A, when constructing the jacket platform 11, a plurality of sacrificial anodes 10 are evenly welded on the jacket platform 11;

B. Install the control power supply 1 on the upper part of the jacket platform 11; connect the lower end of the integrated tensile cable 6 with multiple auxiliary anodes 7 installed on the lower part to the weight 9, and the upper end is divided into tensile steel via the junction box 5 Cable 4 and cable 2; stretch the tensile steel cable 4 and cable 2 to the upper part of the jacket platform 11, and place the weight 9 at the specified position; fix the tensile steel cable 4 on the jacket platform 11 through the fixing device 3 , the output positive pole of the control power supply 1 is connected to the cable 2, and the output negative pole is connected to the jacket platform 11;

C. Control the power supply 1 to supply the auxiliary anode with an applied current at the initial stage of operation of the jacket platform, and reduce or turn off the current after a dense deposition layer is formed on the surface of the jacket.

According to the situation of the calcium and magnesium deposition layer formed on the surface of the jacket platform 11, the current of the control power supply 1 is adjusted.

Compared with prior art, the beneficial effect of the present invention is:

The present invention can increase the initial protection current by adopting the combined operation of impressed current cathodic protection and sacrificial anode cathodic protection, so as to realize the initial rapid polarization of the jacket, quickly form a dense calcium and magnesium deposition layer, save the amount of sacrificial anode, and reduce the cathode It is a technology to save resources and protect the environment by reducing the protection cost, reducing the platform load, and reducing the pollution caused by the dissolution of metal ions.

Description of drawings

Fig. 1 is a combination protection device of impressed current and sacrificial anode for jacket platform of the present invention.

The reference signs therein are:

1 control power supply

2 cables

3 fixtures

4 tensile steel cables

5 junction box

6 integrated pull cables

7 auxiliary anode

8 connection buckle

9 weights

10 sacrificial anode

11 jacket platform

12 Impressed current cathodic protection system

Detailed ways

The present invention is further described below in conjunction with embodiment.

As shown in Figure 1, an impressed current and sacrificial anode combined protection device for a jacket platform includes an impressed current cathodic protection system 12 and a sacrificial anode 10; the impressed current cathodic protection system 12 includes: a control power supply 1, an integrated tension cable 6. Auxiliary anode 7 and weight 9.

The integrated tensile cable 6 is a composite cable that integrates the cable 2 and the tensile steel cable 4, and has the functions of conducting electricity and supporting load-bearing at the same time. On the mound 9, the other end is stretched to the upper part of the jacket platform 11, and is divided into the tension steel cable 4 and the cable 2 through the junction box 5.

The tensile steel cable 4 is fixed on the jacket platform 11 through the fixing device 3 .

The control power supply 1 is installed on the top of the jacket platform 11 , the output positive pole of the control power supply 1 is connected to the cable 2 , and the output negative pole is connected to the jacket platform 11 .

A plurality of auxiliary anodes 7 connected in parallel are installed on the part of the integrated tension cable 6 submerged in seawater.

The cable 2 is a multi-core cable, and each conductor core of the cable 2 is connected to an auxiliary anode 7 respectively.

Multiple sacrificial anodes 10 are evenly welded on the jacket platform 11 . The sacrificial anode 10 is an aluminum-based sacrificial anode.

The impressed current cathodic protection system 12 can be installed outside the jacket platform or in the middle of the jacket platform.

A combined protection method of an impressed current and a sacrificial anode for a jacket platform, comprising the following steps:

A, when constructing the jacket platform 11, a plurality of sacrificial anodes 10 are evenly welded on the jacket platform 11;

B. Install the control power supply 1 on the upper part of the jacket platform 11; connect the lower end of the integrated tensile cable 6 with multiple auxiliary anodes 7 installed on the lower part to the weight 9 through the connecting buckle 8, and the upper end is 5 minutes through the junction box In order to stretch the steel cable 4 and the cable 2; the engineering ship is used to stretch the tension steel cable 4 and the cable 2 to the upper part of the jacket platform 11, and the weight 9 is placed on the designated position by a crane; the tension steel cable 4 The fixing device 3 is fixed on the jacket platform 11, the output positive pole of the control power supply 1 is connected to the cable 2, and the output negative pole is connected to the jacket platform 11;

C. Control the power supply 1 to supply power, and form a dense calcium and magnesium deposition layer on the surface of the jacket platform 11 .

Impressed current cathodic protection system 12 can be operated after installation. It operates simultaneously with the sacrificial anode 10 according to the design parameters to provide a relatively large protective current at the initial stage of platform cathodic protection, thereby forming a dense calcium and magnesium deposition layer on the surface of the jacket 11 to achieve a Similar to the protective effect of the coating, the protective current density in the cathodic protection maintenance stage can be reduced, and the amount of sacrificial anodes can be reduced; after the formation of a dense calcium and magnesium deposition layer, the output current of the applied current cathodic protection system 12 can be adjusted to a small level, and can even be turned off depending on the situation Impressed current cathodic protection system12.

Claims (8)

1. An impressed current and sacrificial anode combined protection device for a jacket platform, characterized in that: the device includes an impressed current cathodic protection system (12) and a sacrificial anode (10); The impressed current cathodic protection system (12) includes: a control power supply (1), an integrated stretching cable (6), an auxiliary anode (7) and a weight (9); One end of the integrated tensile cable (6) is connected to the weight (9) placed on the seabed, and the other end is stretched to the upper part of the jacket platform (11), and is divided into tensile steel cables by the junction box (5). cable (4) and cable (2); The tensile steel cable (4) is fixed on the jacket platform (11), the output positive pole of the control power supply (1) is connected to the cable (2), and the output negative pole is connected to the jacket platform (11); A plurality of auxiliary anodes (7) connected in parallel are installed on the part of the integrated tension cable (6) submerged in seawater, and the auxiliary anodes (7) are operated with an applied current at the initial stage of operation of the jacket platform. Reduce or turn off the current after a dense deposition layer is formed on the surface; Multiple sacrificial anodes (10) are evenly fixed on the jacket platform (11). 2. The combined protection device of applied current and sacrificial anode for jacket platform according to claim 1, characterized in that: The cable (2) is a multi-core cable, each conductor core of the cable (2) is respectively connected to an auxiliary anode (7), and the control power supply (1) is respectively supplied to each auxiliary anode (7) via each conductor core of the cable (2). 7) Power supply. 3. The combined protection device for applied current and sacrificial anode of the jacket platform according to claim 1, characterized in that: The integrated tensile cable (6) is a composite cable integrating the cable (2) and the tensile steel cable (4). 4. The combined protection device of applied current and sacrificial anode for jacket platform according to claim 1, characterized in that: The sacrificial anode (10) is an aluminum-based sacrificial anode, and the junction box (5) is made of seawater-resistant stainless steel. 5. The combined protection device for applied current and sacrificial anode of the jacket platform according to claim 1, characterized in that: The integrated tensile cable (6) is connected to the weight (9) through the connecting buckle (8); the material of the connecting buckle (8) is duplex stainless steel or titanium; the weight (9) is reinforced concrete The structure is reinforced with welded sacrificial anodes to prevent corrosion, and the exterior of the concrete is painted with a seawater-resistant coating. 6. The combined protection device for the applied current and sacrificial anode of the jacket platform according to any one of claims 1-5, characterized in that: The impressed current cathodic protection system (12) is installed outside the jacket platform (11), or installed inside the jacket platform (11). 7. A combined protection method of applied current and sacrificial anode utilizing the jacket platform of the device according to claim 1, characterized in that: the method comprises the steps of: A, when constructing the jacket platform (11), a plurality of sacrificial anodes (10) are evenly welded on the jacket platform (11); B. Install the control power supply (1) on the upper part of the jacket platform (11); connect the lower end of the integrated tensile cable (6) with multiple auxiliary anodes (7) installed on the lower part to the weight (9), and the upper end Divided into tension steel cables (4) and cables (2) through the junction box (5); the tension steel cables (4) and cables (2) are stretched to the upper part of the jacket platform (11), and the weight (9) Place it at the specified position; fix the tension steel cable (4) on the jacket platform (11) through the fixing device (3), connect the output positive pole of the control power supply (1) to the cable (2), and connect the output negative pole to the cable (2). The jacket platform (11) is connected; C. Control the power supply (1) to supply power, so that the auxiliary anode is supplied with an external current for operation at the initial stage of operation of the jacket platform, and the current is reduced or turned off after a dense deposition layer is formed on the surface of the jacket. 8. The combined protection method of applied current and sacrificial anode for the jacket platform according to claim 7, characterized in that: According to the situation of the calcium and magnesium deposition layer formed on the surface of the jacket platform (11), the current size of the control power supply (1) is adjusted.