Telemechanical system for monitoring and controlling cathodic protection units of gas pipelines

FIELD: physics; control.

SUBSTANCE: invention relates to telemechanics and automated systems for measuring, monitoring, adjusting, diagnosing and controlling remote objects, and specifically to systems for corrosion monitoring of electrochemical protection of gas pipelines, particularly cathodic protection units. The telemechanical system for monitoring and controlling cathodic protection units of gas pipelines comprises cathodic protection units, a control station with an automated workstation for a controller and a communication channel between cathodic protection stations and the control station. The communication channel is set up by connecting an overhead power line to high-frequency chokes and coupling capacitors, connected to coupling filters which are provided with grounding blades and are connected to high-frequency communication units, one of which is installed at the control station and is linked to the automated workstation of the controller, and the other are installed in the cathodic protection units and are linked to monitoring and control units; furthermore, each anode grounding connection and each pipeline drainage point is connected to a measuring transducer which is linked to the monitoring and control unit.

EFFECT: high reliability of cathodic protection units of gas pipelines.

2 dwg

 

The invention relates to the field of robotics and automated systems for measurement, monitoring, control, diagnosis and management of remote objects, and in particular to systems corrosion monitoring cathodic protection of pipelines, in particular cathodic protection.

Installation of cathodic protection (ukz) provide electrochemical protection of pipelines from corrosion and increase the life. The installation of a cathodic protection consist of one or more cathodic protection stations (RMS) (depending on the number of threads pipelines), deep anode ground wires, sensors for measuring the protective potential of pipelines and speed sensors corrosion. The output signals of the latter are measured at the measuring points (KIP).

Cathodic protection of metallic pipelines is carried out so that they had a constant value of protective potential provided by the cathodic protection stations (RMS), regardless of changes in the conductive properties of the soil and the currents flowing in it.

One installation of cathodic protection (ukz) provides a limited length of the protective zone of the pipeline. For protection of the pipeline installation are installed with a certain step in its entirety.

To collect information from all of the mouth of the mode of cathodic protection and management of their technical means used various remote automated corrosion monitoring system, in which as communication channels currently in use are the following:

- wired telephone line;

- channel VHF;

- radio relay links;

- mobile cellular communication GSM;

- satellite communication channels;

- fiber-optic communication lines.

More than 70% of the territory of the Russian Federation refers to the cold area, climatic conditions which have a decisive impact on the reliable operation of cathodic protection. Therefore, in recent years special attention is paid to not only the reliability of cathodic protection stations (RMS), but also the continual monitoring of technical means of cathodic protection (ukz) to ensure proper and timely maintenance and repairs, as well as issues telemetry parameters ukz remote adjustment of its work to ensure the effective protection of pipelines.

Known remote-control system and control stations cathodic protection (patent RU 101545 U1 G05B 19/00, publ. 20.01.2011) containing cathodic protection stations, controllers, remote control with integrated GSM GPRS modems, peripheral channels of communication, antenna-feeder device controllers, remote control, GSM GPRS channels of the transmit-receive data, antenna-feeder devices mobile operator, SM GPRS server mobile operator, automated jobs. Its composition also includes a dedicated single server remote control, INTERNET communication channel providing communication between GSM GPRS server of the mobile operator and the server remote control, the communication channels INTRANET/INTERNET, providing communication between the telecontrol server and workstations, complex server software, consisting of routine transmit-receive data and routines for visualization, processing and storage of data. The telecontrol server receives data from the controllers telecontrol stations, cathodic protection, processes and submits it to the workstations directly without intermediate servers reception, switching, and communication. Controllers remote control use the channel GSM GPRS communication and software TCP/IP. Routine data transmit-receive functionally designed in the form of services that run server operating system remote control. Routine imaging, data processing and storage is implemented by means of WEB-programming. Complex server software installed on a single server remote control and implements the functions of the SCADA. The peripheral channels of communication for the transmission of data from the object of control in the controller of the remote control are presented in Aut a line interfaces RS-232, RS-485. Complex server software using hardware and software server remote control and the INTERNET provides an unlimited number of points of regulated access to information on cathodic protection stations based on the classification of the user name (login) and password (password) and thereby implements the functions of information security and delineating the rights of users.

The disadvantages of the known telecontrol system of monitoring and control of cathodic protection stations are as follows:

the system involves the use of communication channels GSM GPRS with complex equipment GSM GPRS involving GSM modems, GPRS and antenna-feeder devices. This equipment and its installation are costly;

- organization of information transmission over the air, which uses this system as a communication channel, in terms of rugged relief is impossible because of the limited range of radio equipment;

- there is no control current value of each anode earthing characterizing the state of his health. The lack of information about the change in time of the anode current of each of earthing is not possible to estimate the rate of dissolution of its electrodes and in a timely manner to carry out the necessary repairs;

- there is no control current at each point of the drains of the MS (the point of connection to the pipeline), characterizing the condition of the insulation of the current-carrying wire and the condition of the contact points node drainage. The absence of control current at the point of drainage reduces the efficiency of the process control cathodic protection of the pipeline.

The closest analogue of the claimed utility model is known subsystem corrosion monitoring (PCM) "scat" (http://forum.sferamk.runwww.forum.sferamk.ru/index.php/ru/pkm-skat; http://www.signalrp.ru/catalog/skat-s/). Subsystem corrosion monitoring (PCM) "scat" is a system of distributed type, includes: automated workplace (AWP) Manager, the installation of a cathodic protection the cathodic protection stations (RMS), equipped with remote monitoring and control points (KIP), joint communication channels.

Rack instrumentation installed remote control (UDC KIP), which provide the measurement and transmission through a communication channel protective and polarization potentials, also the condition of the plates indicators corrosion sensor.

Information exchange signals cathodic protection stations (RMS) with an automated operator workplace (AWP), you can:

- on mobile channels GSM (SMS/CSD/GPRS);

- VHF radio;

- on a local area Ethernet network;

- physical duhp the water line through the RS-485 interface.

Information exchange signals UDC instrumentation workstation Manager can be accessed through the mobile channel GSM (SMS/CSD/GPRS) or physical two-wire line via the RS-485 interface.

Subsystem corrosion monitoring (PCM) "SCLT capturing, storing and displaying on the monitor the operator workstation, the following main parameters of the installation of a cathodic protection (ukz):

- total capacity;

- polarization potential;

- status indicators speed sensor corrosion;

- the output voltage of the cathodic protection stations (RMS);

- output current RMS;

- supply voltage and current consumption installation.

- the state of intrusion detection devices;

- breakage of the electrode;

Cap SCLT" provides the following control functions:

- setting current value VHC;

- setting protective capacity;

installation modes VHC.

The disadvantages of the known subsystem corrosion monitoring (PCM) "SLT" are as follows:

- this system involves the use of wireless (radio channel) communications. When the communication quality is significantly affected by the terrain and weather conditions, which reduces the operational reliability of the system;

- there is no control current value of each anode earthing characterizing the state of his country customization operating capability the spine (wear). The lack of information about the change in time of the anode current of each of earthing is not possible to estimate the rate of dissolution of its electrodes and in a timely manner to carry out the necessary repairs, which reduces the efficiency of the system;

- there is no control current at each point of the drainage (the point of connection to the pipeline), characterizing the condition of the insulation of the current-carrying wire and the condition of the contact points node drainage. The absence of control current at the point of drainage reduces the efficiency of the process control cathodic protection of the pipeline, which also adversely affects its performance or reliability.

The technical task of the invention is the creation of a telecontrol system of monitoring and control of cathodic protection of pipelines, providing case the communication in any terrain and increased functionality of the control parameters for each installation forecasting failures of their components.

The specified technical task proposed to solve with the help of high-frequency communication channel, organized by the connecting equipment control office and cathodic protection to the air lines, and using transducers that are connected to each anode satellites and to each point of the drainage pipeline.

The technical result is increased reliability of operation of the cathodic protection of gas pipelines.

To achieve a technical result in telematic system of monitoring and control of cathodic protection of pipelines, containing the installation of a cathodic protection the cathodic protection stations, with blocks and control, pipelines, anode grounding, control and measuring points, sensor capabilities and speed sensor corrosion control point with workstation Manager, the communication channel between stations cathodic protection and control point, according to the invention, the communication channel is arranged by connecting to overhead power line high-frequency chokes, capacitors communication, United with filters attached, with earthing blades and connected to the blocks a high-frequency communications, one of which is installed in a control room and associated with the workstation Manager and others in the cathodic protection and associated with the control units and control, in addition to each of the anode to ground and to each point of the drainage pipe connected to the transmitter associated with the control unit and the control.

The invention and its principle of work is s illustrated by the schema.

In Fig.1 shows a structural diagram of the telecontrol system of monitoring and control of cathodic protection of gas pipelines; Fig.2 - installation of cathodic protection.

Telemechanics system of monitoring and control of cathodic protection of gas pipelines (Fig.1) contains control point (DP) and the installation of a cathodic protection (ukz) interconnected linear high-frequency channel communication overhead power transmission lines (PTL), consisting of high-frequency chokes (VCS) and capacitors communication (CC) with appropriate filters attach (FC).

Control point (DP) contains the automated workplace (AWP) Manager, United line interface RS-485 with power-frequency (RF) communication, the output of which is connected to the filter connection (FP) linear high-frequency communication path but power lines.

Workstation Manager contains a Central processing unit (computer) installed in it with an appropriate program, which provides automated control of each installation of cathodic protection (UCF), a collection of technological information from all controlled ukz, processing, storage and presentation of this information to the scheduler.

Each installation of cathodic protection (ukz) (Fig.2) contains a power transformer connected to the power lines, is tanzio cathodic protection (VHC), connected to the deep anode grounding (AZ) and pipelines, control and measuring points (KIP), which are derived output signals from the sensors corrosion rate (DSC) and sensors potentials (APS). Signals DSC and PD are transmitted to the control unit and control. Sensors potentials connected to the measuring transducer, connected to the control unit and the control.

Control unit and control connected to the RS-485 unit frequency (RF) communication, the output of which is connected to the filter connection (FP) linear high-frequency path, connected to the earthing knife (MN), and then through the coupling capacitor (CC) to the phase of the power lines.

To control the current to each of the deep anode ground (AZ) connected measuring transducer (PI), the output of which is connected to the control unit and the control.

Measurement of the current value of each of the deep anode ground provides automatic monitoring of its performance and ensures the quality of the technological process of electrochemical protection of pipelines, which is necessary for long-term operation of the deep anode ground, when there is a gradual dissolution of the anode electrode ground wire or the insulation fault current-carrying wire.

For example, in the case of an open circuit or is atrasheniya anode earthing the magnitude of the anode current becomes zero, what generates the control unit and the control signal "Fault". The signal of the defective anode earthing via the RS-485 enters the block frequency communication, and then through the filter attach (FC) and the coupling capacitor (CC) is one of the phases of the transmission line high voltage. This information transmission line through a coupling capacitor (CC) and the filter connection (FC) connected to block high-frequency communications dispatch center (Fig.1), is fed to the automated workplace (AWP) Manager, then the decision about sending crews to clear this fault.

To control the current at each point of the drainage (AP) (the point of connection to the pipeline) is connected measuring transducer (PI), the output of which is connected to the control unit and the control (Fig.2). The current measurement at the point of drainage provides rapid correction values to maintain the required value of the protective capacity of the pipeline and automatic control of technical condition of the join node and isolation of the conductive wire.

The channels of communication, organized by connection to the power lines, cheaper and more reliable channels created on the basis of radio channels, wired and fiber-optic lines, so as not to spend money on the equipment and the proper operation of communication lines, and the operational reliability of the transmission line is much higher than other communication channels.

The current measurement of each of the deep anode ground measuring Converter provides automatic monitoring of his health, which is necessary for long-term operation of the deep anode ground, when the dissolution of its electrodes or insulation fault current-carrying wire.

The measurement of the current at each point of the drainage of the measuring transducer provides rapid correction values to maintain the required value of the protective capacity of the pipeline and automatic control of technical condition of the join node or isolation of the conductive wire.

Thus, the use of high-frequency communication channel over the air transmission line and get more information about the work of deep anode ground wires and nodes joining in the drainage points will give the possibility to adjust the parameters of the process of electrochemical protection of pipelines and to prevent malfunction of the corresponding equipment that provides increased reliability of operation of the cathodic protection of gas pipelines.

Telemechanics system of monitoring and control of cathodic protection mA is astralnyh gas pipelines, contains the installation of a cathodic protection the cathodic protection stations, with blocks and control, pipelines, anode grounding, control and measuring points, sensor capabilities and speed sensor corrosion control point with workstation Manager, the communications channel between the cathodic protection stations and a control station, wherein the communication channel is arranged by connecting to overhead power line high-frequency chokes and capacitors communication, United with filters attached, provided with ground knives and connected to the blocks of the high-frequency communication, one of which is installed in a control room and associated with the workstation Manager, and others in the cathodic protection and associated with the control units and control, in addition to each of the anode to ground and to each point of the drainage pipe connected to the transmitter associated with the control unit and control.



 

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1 dwg

FIELD: protection of metals against corrosion; protection of extended underground gas lines against corrosion.

SUBSTANCE: proposed method includes restoration of defective sections of gas lines by application of insulating protective coats and connection with cathode protection system; defective section of gas line is preliminarily disconnected from gas main and is freed from natural gas; gas released from this section is compressed and is charged in reservoirs under pressure; gas line surface is cleaned from soil and defective coat by forming temperature gradient and stresses between defective coat and gas line; then finish cleaning of outer surface of gas line is performed at simultaneous suction of dust and gas line is heated to temperature of 70 to 175°C, after which layers of adhesive composition and dielectric insulating coat are applied at succession at overlapping joints between steel pipes of gas line and layer of spiral-shaped coat made from metal at potential more negative as compared with potential of gas line being protected; metal coat is applied in form of tape or foil whose ends are brought out at distance of (0.01-1)d, where d is diameter of pipe. Then, insulating plastic coat is applied on metal coat and after erection of gas line, ends of tape or foil are electrically connected at points of joints of steel pipe over entire length of gas line through switching units and parameter measuring units.

EFFECT: enhanced reliability of corrosion protection; considerable reduction of energy expenses; increased service life of metal coat.

3 cl, 10 dwg

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