RU1313008C - Method of protecting steel underground constructions against electrochemical corrosion - Google Patents

Abstract

The invention relates to equipment for protecting metals from corrosion and can be used in corrosion protection of steel underground pipes, wires. The purpose of the invention is to increase the protection efficiency of the protection potential over the surface of the protected structure. The flowing anode is placed directly on the protected structure 1, made in the form of a layer 3 of tread metal, placed between the 2.4 layers of insulation coating of the metal structure of the protected structure, covering the entire surface of the protected section of the structure, and the tread anode and the main metal of the structure have mutually isolated current supply conclusions 5 and 6. The uniform distribution of the protective potential over the surface of the protected structure is achieved due to the fact that the tread anode is made in the form a tread metal layer interposed between the layers of the insulating coating. 2 s.p., f-ly, 3 ill. s (L s o o o 00 Fie.G

Description

The invention relates to equipment for protecting metals from corrosion and can be used in corrosion protection of steel underground pipelines and other underground utilities and structures.

The purpose of the invention is to increase the effectiveness of protection.

Fig. 1 is a view of a terminal portion of a steel gas pipe with a partial cut and cross section; in FIG. 2- section AA in FIG. 1; Fig. 3 shows the connection of current-carrying leads

The steel pipe, protected from electrochemical corrosion by the tread anode, made in the form of a layer of tread metal, placed between the layers of its insulating coating, has a wall 1 coated on the outside with an insulation layer 2, a layer of metal 3 of the tread anode covering the surface of the first layer 2 the insulation of the outer surface of the pipe 1, the insulation layer 4 of the outer surface of the tread anode metal layer 3, which is the second and outer insulation layer of the pipe 1,

The metal layer 3 of the sacrificial anode and the wall 1 of the pipeline have insulated conductors 1cie. conclusions, respectively 5 and 6.

Insulation layers 2 and 4 can be made of non-deficient bituminous mastics, usually used for the insulation length of underground steel structures, and the tread metal layer 3 is most expediently made of aluminum foil 0.2-0.5 mm thick wound in one or two layers, depending on the operating conditions of the pipeline.

Figure 2 shows one type of connection of the conductive terminals 5 and 6, respectively, from the tread anode 3 and from the base metal 1 of the pipeline, when the tread anodes of all pipes are connected in series and connected to the base metal of the pipeline.

The welded joint of the pipeline pipes, as well as with the existing technology, is manually insulated and the metal layer of the tread anode is manually applied to the lower insulation layer. It is desirable that the metal spacer of the tread anode applied to the pipe junction has a good electrical

10

fifteen

twenty

25

thirty

35

40

45

fifty

55

contact with the tread coatings of adjacent pipes.

The design of the tread anode in the form of a continuous shell and tread metal, monolithic in the insulating coating of the underground structure, allows to obtain the following technical and economic effect.

It makes it possible to apply a layer of tread metal to the underground metal structures. weapons in the factory during the application of insulating coatings, which creates the prerequisites for the mechanization and automation of the process and thereby reduce the complexity and cost of installation of the tread protection of steel underground structures.

It creates the conditions for the use of non-deficient insulating materials as insulation for underground structures and, in particular, pipelines.

Corrosion protection with a tread anode of the proposed design will significantly reduce energy consumption, operating costs and capex for corrosion protection of underground structures due to the fact that during the construction of new structures it will be possible to refuse to install special cathodic protection stations.

The use of metal structures with a tread anode monolithic in the insulation coating layer will reduce the time and money spent on the design stage of electrochemical corrosion protection and shorten the time for commissioning steel underground structures.

The use of the tread anode of this design will significantly increase the security of underground structures, and D particular pipelines from. the action of stray currents and currents of macropairs, which will significantly (by 15-20 years) extend the life of underground structures and significantly reduce the breakdown caused by their corrosion damage, which are possible with existing corrosion protection agents, which is especially important for equipment operation in oil and gas enterprises of the country .

The use of a tread anode of this design will significantly increase the accuracy and efficiency of quality control of insulating coatings of newly constructed and operated underground structures.

Claims (3)

The claims K A method of protecting steel underground structures from electrochemical corrosion, comprising placing a tread on a protected structure, characterized in that, in order to increase the efficiency of protection 5  Oh and 13008 you the tread is placed between the layers of the insulating coating of the metal structure of the protected structure and is made in the form of a metal layer. 2. The method according to claim 1, with the exception that the metal layer covers the entire surface of the effective section of the structure, 3. The method of popp. 1 and 2, characterized in that the conductive leads of the tread and the base metal of the structure are mutually insulated. Aa Figure 2 Fig.Z Editor L. Lashkova Compiled by S. Ponomarev Tehred A. Kravchuk Proofreader L. Patay The order. Subscription VNIIIPI of the State Committee of the USSR for affairs of inventions and discoveries 113035, Moscow, Zh-35, Rauska nab., d. 4/5 Production and printing enterprise, Uzhhorod, st. Projectna, 4