Deep anode ground disk

 

The invention relates to deep anode grounding and can be used to protect underground pipelines from electrochemical corrosion. We offer earthing contains two concentric spaced steel tubes, the space between which is filled with coke fines, to the inner tube along the entire length of its working parts are welded bilateral welding seam steel wheels at an angle of at least 40oto the horizon, covering the pipe with a diameter providing a clearance between the edge of the disc and the inner surface of the outer pipe not less than 7 maximum size of the largest particles of the coke breeze. The pipes in the form of pre-fabricated mounting sections of length equal to or comparable to the length of the industrial assortment of pipes, gathered together during installation of earthing. The use of the invention will reduce the amount of welding and Assembly works related to the installation of the earthing switch in the hole, a high degree of industrialization of production and the achievement of uniform flowing of the electric current from the ground, its reliability and long service life. 2 Il.

The invention relates to the protection of underground pipelines on polozhenie steel pipe, the space between which is filled with coke fines, and to the inner tube along the entire length of its working parts are outside of the fixed steel elements (SU/s 414885, 23 F 13/00) in the form of rods.

A disadvantage of the known ground is uneven running off the electric current from the anode earthing, which leads to premature wear of individual sections of the deep anode ground.

Closest to the invention to the technical essence and the achieved result is deep anode ground containing two concentrically arranged steel pipe, the space between which is filled with coke fines, and to the inside along the entire length of its working parts are outside of the fixed steel elements in the form of discs, covering pipe (SU/s 852969, 23 F 13/00).

This earthing has several disadvantages: - the design of the earthing does not allow the Assembly and mounting it into the well in an industrial way, i.e. from prefabricated at the factory Assembly sections of the inner pipe welded to the disks and the outer pipe of appropriate length with subsequent backfilling the annulus coke detail, because when the backfill under the disks are formed cavity,the morning surface of the outer pipe coke fines due to the arching effect (see A. Century Katalyma, C. A. Lubartowicz "Dispensing granular and viscous materials", Leningrad, Khimiya, 1990), resulting in an in-line space during the working part of the earthing is not filled coke fines. Earthing in both cases will be inoperative to the extent that was intended.

In order to avoid such a situation, welded disks and coke breeze backfill must be made sequentially, as the design of the earthing: first you need to fill the coke breeze to a height equal to the distance between the disks, and then to weld the drive to fill the coke breeze and weld on the disk and so forth, but in this case, the length of the outer pipe must not exceed the length of the welding electrode -0,3 m, otherwise unavailable will be welding the disks. Manufacturer of earthing of the pieces of pipe of this length requires a large amount of installation work and the large consumption of welding materials. In addition, the reliability and durability of such ground will be negligible. This statement is well illustrated by comparing the probability of failure-free operation of the outer tube of known earth lead to the end of the requested resource with probability outer whom you weld on the pipe is equal to A== 0,98 (98%). The length of the pipe in the first and second cases is assumed to be 12 m Number of welds on pipe in the first case, taking account of the joints, end caps n1= 12/0,3 - 1+2=41, in the second case, n2==2. The probability of failure of the outer pipe as a whole by reason of failure of the weld, according to theory of probabilities is: in the first case, A1= An1= 0,9841= 0,44(44%), the second A2= An2= 0,982= 0,96(96%). As can be seen from the comparison, in the first case, the reliability of the outer pipe is 2.2 times less than in the second case.

- The design of the earthing switch allows only one-sided welding seam between the disk and the inner pipe. The reliability of this connection of the drive pipe is compared with the reliability of connection of the drive pipe bilateral welding seam made in advance with the industrial method of Assembly and installation, 4 times lower, because one-sided stitch, also known as the location of intensive electrochemical corrosion, exposed to the electrolyte ground on both sides, unlike bilateral representing two-sided weld at each separately in the so output, the design of the earthing extremely unreliable and short-lived.

An object of the invention is the creation of a deep anode ground disk, which design provides a uniform stream of electric current in the ground, reliable and durable, allows for the fabrication, Assembly and installation of it into the well in an industrial way, when a small amount of welding and Assembly works and saving materials.

The technical problem is solved due to the fact that in deep anode ground disk containing two concentric spaced steel tubes, the space between which is filled with coke fines, and to the inner tube along the entire length of its working parts are outside of the fixed steel disks which surround the pipe, according to the invention the tube is made in the form of a pre-manufactured Assembly of pipe sections with a length equal to or comparable to the length of the industrial assortment of pipes, gathered together during installation of earthing and disks secured bilateral welding seam at an angle of at least 40oto the horizon and have a diameter providing a clearance between the edge of the disc and the inner surface of the outer pipe, at least 7 units maximum redstapler on the drawings: Fig.1 - longitudinal section of the earthing switch in the well; Fig. 2 is a diagram illustrating the process of filling the annulus coke fines.

Deep anode ground consists of two concentric spaced steel pipes 1 and 2, the space between which is filled with coke fines 3. To the inner pipe 1 is attached at an angle of at least 40oto the horizon steel wheels 4 over the entire length of the working part. Inside the pipe 1 passes the cable 5. The place of connection of the cable 5 to the pipe 1 and the output of the pipe 1 from the pipe 2 is covered with insulation 6. Outer tube 2 on the ends are connected to the mechanical washers 7 and 8 with the pipe 1. The space 9 between the ground and the borehole wall is filled with gravel, sand, broken bricks, etc.,

Earthing is collected as follows: in the factory pre-made mounting pipe sections: the outer 2 holes for the passage of gases and internal with 1 welded to the disk 4 at an angle of 90-= 90-40= 50to the axis. Welded drives 4 Osam seam under the influence of electrochemical corrosion. The length of the sections is selected according to the purpose of earthing, comparable with the length supplied by industry, pipe schedules that will allow 2 or more times to increase the reliability of the outer tube 2 under the influence of electrochemical corrosion in comparison with the prototype, with the pipe 2 is welded from lengths of 0.3 m Welding and Assembly of pipe sections 1 and 2, the mechanical washers 7 and 8, the connection cable 5 and the insulation 6 of the pipe 1 and backfilling the annulus coke fines 3 carry out as you descend earthing switch in the hole. The size of the disk 4 is chosen so that the gap "I" between the edge of the disc 4 and the inner surface of the outer tube 2 was not less than 7 maximum dimension dmaxthe largest of the particles 10 coke breeze 3, to avoid the formation of a set of particles 10 and obstruction clearance "I" (see A. C. Katalyma, C. A. Lubartowicz "Dispensing granular and viscous materials", Leningrad, Khimiya, 1990), preventing the penetration of coke breeze 3 annulus.

From the above source, it is known that coke breeze 3 refers to incoherent loose materials angle of repose°1= 25is t equal to+°1to ensure the natural shedding of the coke breeze 3 disk 4 on the surface of repose 11. From the top disc 4 is filled with coke fines freely. From°1depends on the size of the bottom surface of the disc 4 is not in contact with the particles 10 coke breeze 3-1 l1= d/sin°1on the reliability and completeness of the electric conductivity between the bottom surface of the disk 4 and coke fines 3. Experiments have shown that when the angle°1= 5-15the conductivity of the contact of the lower surface of the disk 4 with coke fines 3 is equal to the conductivity of the upper surface of the disk 4 with coke fines 3. Thus, the compliance gap 17dmax, the angle of the disc 4 to the horizon35)+(155)40within the required limits, provides backfilling the annulus ground coke fines 3 without voids regardless of the length of the pipes 1 and 2, which guarantees the reliability and the electric conductivity between the disk 4 and coke fines 3, which in turn is a guarantee of reliable and long-term operation of earthing for the entire booked period of its operation.

Deep anode ground disk works as follows.

Design features of the device: the tilt of the disk 4 to the horizon at an angle of 40oand the gap between the edge of the disk 4 and the inner surface of the pipe 2 over 7 maximum size of the largest particle coke breeze; provides full, without cavities under the disks 4, natural osypanie disks 4 and the tube 1 and the complete filling of the annulus, which, in practice, a reduction of 1.2-1.3 times the resistivity and decrease in 1,3-1,5 times electrochemical equivalent of earthing compared with earthing switch without tilt drive with noncontrolled gap between the edge of the disk and the inner surface of the outer pipe and fill odace electric current on the inner tube 1 around the earth creates an electric field, leading to electrochemical dissolution of the first outer pipe 2, then 4 disks and at least the inner pipe 1.

The present invention can be used for protection against electrochemical corrosion of underground steel pipelines with the use of deep anode grounding disk.

The use of earthing of the proposed design provides a uniform runoff electric current of earthing, increased service life compared to the prototype, while significantly reducing welding and Assembly works and materials during the installation of the earthing switch in the hole, guaranteed reliability and a high degree of industrialization of production.

Claims

Deep anode ground disk containing two concentric spaced steel tubes, the space between which is filled with coke fines, to the inner tube along the entire length of its working parts are outside of the fixed steel disks covering the tube, wherein the tube is made in the form of a pre-manufactured Assembly section length equal or comparable to the length of the industrial assortment of pipes, gathered together when installing for Amer, to ensure that the gap between the edge of the disc and the inner surface of the outer pipe not less than 7 maximum size of the largest particle coke breeze.

 

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