RU304U1 - Cathodic protection station - Google Patents

Abstract

1. A cathodic protection station, comprising a casing installed in the ground, a power unit and a control unit to which connecting cables are connected, characterized in that the casing of the station is made in the form of a vertically mounted cylindrical pipe with inlet pipes arranged along it with a protective cap, covering the upper ends of the cylindrical pipe and the supply pipes, and with a sealed partition installed in the middle part of the cylindrical pipe, while the power unit is placed in a cylindrical frame installed m on a sealed partition, the control unit is mounted on a removable base, placed on a cylindrical pipe under a protective cap, connecting cables are laid inside the supply pipes, the lower ends of which are below ground level, the power unit is immersed in a dielectric fluid, such as transformer oil, and the protective cap is attached to a cylindrical pipe with fasteners for a special key. 2. The station according to claim 1, characterized in that the cylindrical pipe has heat-dissipating ribs, and the walls of the cylindrical frame are made with through holes. The station according to claim 1, characterized in that the protective cap at the lower end and the removable base of the control unit have U-shaped recesses for the application of connecting cables.

Description

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iv) 13/02

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S T A N C AND I K A T O D N ABOUT AND PROTECTION.

A useful tool belongs to the field of protecting metals from corro: 1; And, and more specifically, to cathodic protection means, it can be used to protect against soil corrosion of oil and gas pipelines, wells and other supporting structures.

The fight against metal corrosion is one of the oldest problems. Latodnan protection is electrochemical1: The method of protecting the waterwalls is realized by regulating the magnitude of the electric potential of the object to be negative. Polarization of the protected is achieved by connecting it 1 to an external energy source that converts the current of industrial frequency to direct. The protected is connected to the refractory pole of the rectifier, so that it acts as a cathode. : the second electrode / anode is plugged / aligned with the positive PO. of the source, i.e. it forms an anode. The cathodic protection is ensured by: v It is used to maintain the necessary potential, measured between the highest object and the special reference electrode. By automatically controlling the parameters of voltage / current, current or power /, a difference of 15 times the gap between the ground and the metal structure F with soil i is limited and maintained within specified limits

- 3 The complex of facilities intended for cathodic polarization of protection objects in the technical literature was called cathodic protection stations

The cathodic protection station is usually made in the form of a cabinet, which is attached to the power supply tower or mounted on the ground on a special base / concrete or metal i ivide /, around which a protective fence is built

Sources of constant / t gpryaklennoy / controls the south current are placed inside the station, - connecting cables, wires iiiiKH. 1 4 makes protective closure. At msgut stations prsh.-. Electrical and corrosion-measuring devices, devices for protection against atmospheric overvoltages, overloads, automatic regulation of potential differences, protective ground, telecontrol, rear voltages of personnel under voltage, etc. ji-fl In order to remove the heat generated by the radio electronic element of the station, blinds are provided for through which the heated air passes.

Station cabinet doors can be locked.

The experience of operating well-known cathodic protection stations shows that they have low operational reliability, and their design does not provide sufficient shielding from climatic and 1 thermal effects.

F3 of well-known station designs, the most bloc in terms of technical nature and the achieved results for this useful model is the cathodic protection station described in | 7 i. Such a dancer: I contain a corseus, filled in with a ventilation blinds and installed in the ground on a metal base, a ciuioBot block and a control block, placed inside the body and

/ I

at. - The disadvantages of the known device arise from its solution constructive. As a lie, such stations are operated in the field, which does not allow to organize their constant efficiency: n. Security, Gromozdki, a cabinet from afar attracts the attention of outsiders, and its doors with lock are a weak obstacle for

penetration of radio amateurs, armed with the usual crowbar. : This also includes special security barriers, which are around the cathodic protection stations.

In addition, this design of the station corusus weakly protects its contents: 1) from atmospheric influences (rain, snow, frost, temperature difference), and the removal of heat generated by the power unit only due to natural air circulation is not efficient enough

These shortcomings ultimately lead to a decrease in the reliability of the functioning of the known cathodic protection station.

The utility model is aimed at improving the reliability of the E station's protection from clsh / atical influences and unauthorized access by improving its design

This is achieved by a cathodic protection station comprising a casing installed in the ground, a power unit and a control unit, housed in the casing and connected to the connecting cables, in which the casing of the station is made in the form of a cylindrical pipe mounted vertically in the ground, with inlet pipes arranged along the cylindrical pipe, with a protective cover, we cover the upper ends of the cylindrical pipe F of the inlet pipes, to a sealed partition installed in the middle part of the cylinder pipe, while the power unit placed in a cylindrical frame mounted on a geogel membrane, the etching unit is mounted on a removable base and placed on a cylindrical pipe under

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-. It has a cap, the connecting cables are located inside the supply pipes, the lower ends of which are below ground level, the power unit is immersed in a dielectric fluid, for example, transformer oil, and the protective cap is attached to a cylindrical

pipe fasteners for a special key.

In order to improve the heat dissipation of the biK station electric radio element, the rear pipe has heat-dissipating fins, and the walls of the cylindrical frame are made with through holes.

In addition, for ease of operation, the protective cap at the lower l end to the circuit base of the control unit has C-shaped}; b: e & (1KI, through which the connecting cables are laid.

The essence of the utility model is illustrated by the drawing, where Fig. 1 shows a general view of the cathodic protection station, in fw, 2 shows the design of the protective cap with fragments; housing elements, inlet pipes and circuit base, on fkg. 3 - design of the fastener and the special key. EG. 4 illustrates the electrical part of the cathodic protection station.

The cathodic zaddata station contains a housing made in the form of a cylinder tube 1 with two inlet pipes 2, sheathed by a cap 3 and a hermetically sealed partition 4, a power unit 5, a control unit b and connecting cables AND 7.

The cylindrical pipe 1 is installed vertically in the ground with a level of 8, usually near the shielded 9. Along the surface of the cylindrical pipe 1 are installed heat-dissipated ribs 10 welded to it by welding.

The inlet pipes 2, made of steel pipe sections, are installed along the cylindrical pipe 1 and are welded to the same, so that the lower ends of the pipes 2 are beyond the level 8 of the ground. 5,. .. /. ;

- - / VC70 (/ 4- О / СЧХ /

The protective cap 3 is made of a piece of steel pipe, the upstream end of which is sealed, and the lower one has two p-shaped recesses 11. A skirt 12 is welded from the sides to the protective cap 3, with a cap along which the cap 3 covers the upper ends of the cylindrical pipe 1 and the supply branch pipes 2.

The cylindrical pipe 1 has in the middle part an airtight partition 4 on which a cylinder frame 13 with a C1 fishing unit 5 inside is mounted. The frame 13 is immersed in a heat dissipating dielectric fluid, such as transformer oil. At the same time, the walls of the frame 13 have through holes 14 to increase heat: Its circulation of the dielectric fluid around the power unit 5 is during its operation, and a handle 15 is attached to the upper part of the frame 13 for convenient removal from the cylindrical pipe 1. Level 16 of the dielectric cork is selected so that the handle 15 protrudes from it.

The control unit 6 is mounted on a removable base 17 and placed on a cylindrical pipe 1 under a protective cap 3 / in Fig. 2 j as if not shown /, Removable base 17 two D-shaped 18 dash laying of connecting cables 7. If necessary, on the base 17 other electro-radioelements and devices can be fixed, for example a power meter; .1st electric power, current and voltage meters, overload protection devices, circuit breakers. and t, p.

The protective cap 3 is attached to the cylindrical pipe 1 with two fasteners for a special key 19, The fastening element consists of a bolt 20 with a cylindrical head, on which the restrictive sleeve 21 is mounted. On the other hand, the bolt head 20 has a cylindrical angle extension 22. In the tightened state of the bolt 33, the sleeve 21 Freedom can be made around the “go head”, i.e. around axial flange 23.

The special key 19 is a cylindrical body, on one of the ends of which there is a 1 protruding protrusion 24, and on the other end there is a handle 25. This is the first axial flange 26 and the cylindrical recess 22 and the cylindrical protrusion 24 is relative to the axial flange 23 of the bolt 20 and key 19 on the same distance, and the height and the diameter of the protrusion 24 are made mvshzhmzh respectively depth and Diameter of the recess 22. The diameter of the body of the key 19 is made the inner diameter of the restriction sleeve 19, the height of which is several times the height of wki bolts 20.

For kyuyuch 19, the term “special” only means that the design of the fastener and key 19 differ from the standard, commercially available industry of fasteners and keys to them. It is assumed that they can be manufactured specifically for cathodic protection stations and can only be located by service personnel. MX constructive execution can be different, but on FEG. 3 shows only one of the possible options for implementation.

Connecting cables 7 are laid inside the nozzle

2 F - shaped recesses 11 i 18, respectively, of the protective cap 3 and the circuit base 1 are connected to blocks 5 and 6. With THIS B, the composition of the connecting cables may include power, anode, cathode, measuring, and other cables. - The power block can be made according to the scheme of a controlled single-azim double-half wave vch1rYa1 "plug based on a toroidal

transformer, / shape of which is convenient for placement in a cylindrical frame 13 / and power switching elements - thyristors / on

not shown.

The control unit 6 may contain a precision, thermostable, exemplary source, while the signal circuitry is enabled. The input unit 5 is connected through one of the connected ones: 7 ps cables are connected to the industrial frequency current source 27, a positive output through the other connecting cable 7 to the anode ground connector 28, and the negative output through the third connecting kaal 7 - to the protected object 8. The inputs of the control unit 6 through the fourth and fifth connecting cables 7 are connected to the electrode 29 of the comparison and the protected object 9. Tod unit 6 is connected to a control input of the power unit 5.

In FIG. 4, the dashed line marks the electrical part of the actual cathodic protection station.

The cathodic protection station operates as follows.

When the power unit 5 is connected to a power frequency current source 27, a voltage appears at its outputs. As a result, the anode ground electrode 28 is under positive, and the protected object 9 is under negative potentials. In this case, a mismatch signal is generated in the control unit b on the basis of a comparison of the feedback signal from the protected object 9 and the comparison electrode 29 with the setting specified in the block 6 by the reference voltage source. The mismatch signal in the form of control pulses is fed to the thyristors of the power unit 5, thereby regulating its output current and voltage.

During the operation of the cathodic protection station, a significant amount of tagline energy is released, the bulk of which is the heat released by the power unit 5. The latter heats the dielectric fluid, which, circulating through the ends of the holes 14 of the frame 13, transfers heat to the walls of the cylindrical pipe 1.

The massive structure, consisting of a steel pipe 1 with a heat-dissipating rib 10 and a protective cap 3, provides efficient heat transfer to the surrounding space.

T; pk IT THROUGH the supply pipes 2 in addition to the main / protective / function also play the role of heat dissipation and elements.

Brie repair, maintenance, etc. can fiHTb dismantled the station.

In order to remove the casing cap 3, the special key 19 is inserted into the sleeve 21 of the fastener so that its protrusion: 34 fits into the recess 22. When turning the handle .25 of the key 19 from the side of the handle, the latter tends to rotate around axis 26. However, the restrictive sleeve 21. As a result, the key 19 and the bolt ЗО are forced to rotate around the center line 23.

Upon completion of the unscrewing of all the fasteners, the protective cap 3 is removed from the upper ends of the cylindrical pipe 1 and pipes 2, which provides comprehensive access to the control unit 6,

Thanks to the external cable, 11 i 18, in which the connecting cables 7 are bundled, the flange design allows you to freely remove the unit with the base 17 with the base; l1: core pipe 1, which provides access to the power unit 5. The latter is removed from the pipe 1 by the handle 15.,

The station is assembled in the reverse order.

Thus, the above design of the ethancic cathodic shield is convenient during operation; it provides quite easy access to its units for repair, preventive maintenance, etc. The station’s cylindrical housing with a protective cap and inlet pipes, the lower ends of which are below ground level, reliably protect its contents from climatic and mechanical influences. The protective cap is attached to the housing with bolts under a special key, which virtually eliminates access to it by unauthorized persons.

 According to their outlines, they gave the station a poshgaavt stifled from the top of the oil and gas pipeline, which significantly less attracts the attention of an outside observer. The heat removal system of the station allows maintaining the necessary thermal mode in its units.

By time, the authors have developed, manufactured and tested a pilot batch of the described cathodic station of types KSASH11.6 and KSA1Sh-3.0 with the following main parameters:

Parameters Network, B, Hz: sensitivity, kW Voltage at the output of the current, / PROTECTED current, A The potential is closed. V K I D, Overall dimensions of the power unit, w Overall dimensions of the control unit, um Weight of the power unit with the frame, kg weight of the control unit, kg Diameter of the cylinder pipe, mm Estimated cost as of 30.06.93, rub.

0

KSA1Sh-1.6

Deviations, 50 1.6 48/24 33/66 O .., 5 75 190x28 190x220x1 290000 -flO -lS 30, 50 i 10Г 3.0% / 48 31/62 0 ... 5 75 00x280 x220x10 219 350 000

- iaStantsEya works in the open air in all the climatic / slovenia, except tropical and sea / gr. 5, climatic rcnoJiHeHHe U, category 1 according to GOST 1o1Sh-80 /.

The station has successfully passed state tests and is currently being introduced, in particular, in the state production association Ural-Siberian trunk pipelines.

 The workers of Informational Technologies, taken in the stitching when determining the level of technology :;

1. Strizhevsky IV Underground corrosion and suturing methods. - Under the editorship of H.; v. Kolotkrsha. M.: F / ieaJiJSh) giya,, p. 92. 3. Strizhensk u-.V., Petsj H B.Ya, Corrosion protection of pipelines of reclamation systems, i / i .; Kolos, 1880, p. 132.

3.Nikitenko E.A. Stations of cathodic protection of the main pipelines. M .: Nedra, 1967, p. 93-94, 173-174,

4. New devices for automation and telecontrol of electrical protection of pipelines. Ser. Corrosion control in the oil and gas industry. M .: VYUSHOENG, 1968, p. 7.

5. Bekman V., Oshenk B. Cathode corrosion protection. Directory. M ,: Metallurgy, 1884, p. 215, fig. 9.1.

6.Nkkitenko E.A. I.M. A fitter for protecting underground pipelines from corrosion. M .: Nedra, 1981, p. 92, fig. 88,

7. Beckman B. Cathodic protection. Handbook, M.: Metallurgy, 1992, p. 42, fig. 20 / prototype /.

fourteen

V53 (95T

Claims (3)

1. A cathodic protection station, comprising a casing installed in the ground, a power unit and a control unit to which connecting cables are connected, characterized in that the casing of the station is made in the form of a vertically mounted cylindrical pipe with inlet pipes arranged along it with a protective cap, covering the upper ends of the cylindrical pipe and the supply pipes, and with a sealed partition installed in the middle part of the cylindrical pipe, while the power unit is placed in a cylindrical frame installed m on a sealed partition, the control unit is mounted on a removable base, placed on a cylindrical pipe under a protective cap, connecting cables are laid inside the supply pipes, the lower ends of which are below ground level, the power unit is immersed in a dielectric fluid, such as transformer oil, and the protective cap is attached to a cylindrical pipe with fasteners for a special key. 2. The station under item 1, characterized in that the cylindrical pipe has heat dissipating ribs, and the walls of the cylindrical frame are made with through holes. 3. The station according to claim 1, characterized in that the protective cap at the lower end and the removable base of the control unit have U-shaped recesses for the application of connecting cables.