The presence of the UEC system on PPU pipelines makes it possible to determine with high accuracy the places of moisture penetration into the pipeline (the occurrence of damage or defects in the polyethylene sheath, welded and butt joints), prevent accidents and reduce to a minimum the cost of carrying out repair work. Accuracy in determining the place of moistening of thermal insulation made of polyurethane foam allows you to carry out repair and restoration work quickly, efficiently and with minimal involvement of material and human resources.

Lack of system UEC pipelines PPU at channelless laying entails the impossibility timely detection corrosion of the full section of the pipeline, which is contrary to the requirements safe operation thermal networks.

The cost of equipping the pipeline with devices of the UEC system is no more than 0.5 - 2% of the cost of the facility.

The ODK system consists of:

• built-in copper wire (control conductor) in pre- insulated pipes and pipeline elements in PPU insulation,
• components, fittings for connecting equipment elements,
• measuring equipment for continuous monitoring of controlled pipeline system,
• outline diagram of the entire signaling system,
• a project with documentation on control conductors built into a specific signaling system.

The composition of the instrumental part of the UEC system:

• Terminals (connectors) for connecting control devices. Connectors are usually placed at a distance of 300 meters from each other,
• Cables for connecting signal conductors to terminals in control points,
• Stationary or portable detectors (stationary 220 V or portable 9 V), fixing changes in the humidity of the heat-insulating layer. The detector allows you to simultaneously control two pipelines up to 5 km long each,
• Damage locator (impulse reflectometer) that determines the type and location of a pipeline malfunction or breakage of a signal conductor with an accuracy of several meters,
• Insulation tester.

Principles of operation of the ODK system.

The UEC system provides high precision determination of wet areas of insulation, which cannot be achieved by methods based on the measurement of active resistance. Monitoring the state of the UEC system during the operation of pipelines is carried out using a device called a detector. This device records the electrical conductivity of the thermal insulation layer. When water enters the heat-insulating layer, its conductivity increases, and this is recorded by the detector.

One detector allows you to simultaneously control two pipes up to 5 kilometers long each (two lines of conductors of 10 km each). The detectors can be powered from a 220 V mains supply or from an independent 9 V power source (standard batteries), which eliminates the need for laying separate power lines.

When using a stationary detector, it is possible to organize a centralized control of the state of the UEC system of an extensive heating network of considerable length (up to 5 km) from a single control room. To do this, the stationary detector has contacts with galvanic isolation for each channel, which are closed in the event of a malfunction.

Used to locate damage portable device, called a locator. A pulse reflectometer is used as a locator in the UEC system of STS Izolyatsia, which ensures high measurement accuracy.

One locator allows you to determine the location of damage at a distance of up to 2 kilometers from the point of its connection. Due to the fact that the measurement accuracy of the locator is 1% of the length of the measured line, it is advisable to locate the locator connection points at a distance of no more than 300-400 meters from each other in order to fix the damage location more accurately. To obtain more accurate measurements, these distances must be reduced accordingly.

With the help of STS Izolyatsia locators, you can determine several humidification points from one terminal. The connection of the detector and the locator to the conductors of the UEC system, as well as the necessary switching, is carried out using special connectors called terminals. Terminals are installed in ground or wall carpet.

The terminals are sealed and do not require additional power supply. To simplify switching and measurements, according to the requirements of operating organizations, plug connectors are used. Terminals are connected to conductors using flexible cables. The delivery set includes two types of cables: for connecting terminals at intermediate points along pipelines (5-core cable) and for connecting terminals at the end sections of the heating main (3-core cable). To measure the parameters of the UEC system (insulation resistance and resistance of signal conductors) during the period of work on the insulation of joints, adjustment and commissioning of the control system, an insulation tester is used that provides insulation control during high voltage(250V and 500V).

Measurement at a voltage of 500 V is carried out only for individual elements pipelines during the installation of the heating system. For inspection of installed heating mains, only 250 V voltage should be used.

LIST OF MAIN EQUIPMENT FOR INSTALLATION OF THE UEC SYSTEM

Purpose and main technical characteristics

Switching terminals are an intermediate link between the pipeline and the control device.

Terminals are intended for connection of control devices and switching of signal conductors.

Depending on the functions performed, the terminals differ in design and have different designations:

Designation	Purpose
CT-11	Connection to the UEC system of portable damage detectors. Connection to the UEC system of pulsed reflectometers. Additionally, the terminal performs the function of the "KT-13" terminal, i.e. loops the signal wires. Loopback is performed outside the terminal.
KT-12/Sh	Separation of the UEC system at intermediate points of control. Connection of the UEC system at intermediate points of control. Connecting a portable fault detector and an impulse reflectometer.
CT-13	Loopback of the UEC system. Connection of impulse reflectometers.
KT-14	Connection to the UEC system of a stationary four-channel detector. Connection to the control system of a stackable connecting cable - for a four-pipe system. Connection of four independent systems JDC converging from different sides into one thermal chamber or other similar object or diverging into four different sides from one object.
KT-15	Connection to the UEC system of a stationary two-channel damage detector. Connecting a pulse reflectometer. The connection of two disparate parts of one system from one project. Loopback of the UEC system at the end sections - for a four-pipe system.
KT-15/Sh	Connecting a pulse reflectometer. Connecting a portable fault detector. It performs the same function as "KT-11", but only for four pipes at the same time. Separation of the UEC system into independent sections. Connection of two independent systems of ODK from different projects. Connection of two disparate parts of one system from one project (in the case when the system is separated into parts by pipes or valves not insulated with polyurethane foam). Connection to the control system with a stackable connecting cable. Loopback of the UEC system at the end sections. Performs the same function as "KT-13", but only for four pipes at the same time.
KT-16	Connection of three independent UEC systems converging in one thermal chamber (or other similar object). Connection to the UEC system of a pulsed reflectometer.

Damage detector determines the type and presence of pipeline defects. The detector does not determine the location of the defect.

Detector brand	Name
DPP-A	Portable damage detector
DPP-AM	Portable multi-level damage detector
DPS-2A	Fault detector stationary two-channel
DPS-2AM	Fault detector stationary two-channel multilevel
DPS-4A	Fault detector stationary four-channel
DPS-4AM	Fault detector stationary four-channel multilevel

Locator - pulse reflectometer "Flight - 105R"

Pulse reflectometer is designed to determine the location of defects on pipelines in polyurethane foam insulation with a system of operational remote control(ODK).

Defined defects:

• Insulation wetting (fistula, damage to the membrane).
• Breakage of the conductors of the signaling system of the UEC.
• Closing the signal wire to the pipe.

Distinctive features:

• Compactness.
• Menu in Russian.
• Large memory capacity (up to 200 traces)
• Comes with software.
• Transported in a shoulder bag.
• The cost is lower than foreign analogues.

Instrument capabilities:

• Determination of defects at an early stage of their development - before the operation of damage detectors.
• Detection of defects without disturbing the operation of the heating system.
• Memorization and storage of measurement results.
• Exchange of information with personal computer.

Specifications:

• insulation resistance;
• conductor resistance.

Used for:

The project is a system of operational remote control SODK.

In this project, a SODK was designed to systematically monitor the state of insulation and promptly identify areas with high humidity isolation in pipelines from polyurethane foam pipes.

The principle of operation of the pulse type SODK is based on the measurement electrical resistance a thermal insulation layer between the steel pipe and the two copper wires of the control system, forming a signal circuit that runs along the entire length of the pipeline.

Basic requirements for the elements of the SODK system:

1. Distance from copper wire to steel pipe- 15 mm.

2. Insulation resistance control:

The resistance between the signal wire and the steel pipe (for one pipe or fitting - 20 m of wires or less) must be at least 10 MΩ;

The insulation resistance of a 300 m pipeline varies inversely;

A voltage of 500 V should be used to monitor the insulation resistance.

3. Signal loop resistance control:

Resistivity copper wires 0.012-0.015 ohm/m;

Exceeding the permissible value of the resistance of the signal circuit for the corresponding length of wires of the control system indicates a poor-quality connection of wires at the joints.

In the production of pre-insulated pipes and shaped products they contain copper wires of the control system as standard. Tinned copper wire is used as the main "signal" wire. white color, which is located in the pipeline to the right in the direction of water movement (for the return pipeline, the direction is the same as for the supply). The second wire - bare copper - "transit" passes through the entire heating network without breaks.

For systematic monitoring of the state of insulation, the use of a portable damage detector "Vector 2000" and the possibility of connecting it to the measuring terminal "KT-11", as well as a locator - a pulsed reflectometer "Reis-105R" to determine the exact location of damage and the type of defect (wet insulation, breakage of the signal wire) when connecting it to the terminals "KT-11", "KT-12" and "KT-13".

Organization of control using the SODK system:

The control electrical parameters The signal circuit is carried out separately for the supply and return pipelines.

Looping of wires is provided in the end element of the UEC system.

On pipelines with polyurethane foam insulation, a two-stage control of moisture and the state of the insulation should be carried out:

At the first level, constant monitoring of pipelines is necessary to determine the state of the insulation - it is carried out by the operating personnel using a damage detector, it allows you to determine the presence of damage, to determine the location of the detected damage, a second level of control is needed;

At the second level of control, control should be carried out using a pulsed reflectometer (damage locator) and only by highly qualified, specially trained personnel.

To organize such control over the state of PPU insulation, it is necessary:

1. Organize periodic inspection using a portable damage detector: 2-4 times a month.

2. Organize a full in-depth periodic survey using a pulsed reflectometer: once a quarter. The survey data should be entered into the database in order to monitor the dynamics of the state of the PPU insulation.

3. Organize immediate determination of the location of the damage after the detector is triggered and eliminate it.

Installation of the SODK system:

The project was carried out in accordance with the "Instructions for the design, installation and operation of an operational remote control system (SOODK) of an impulse type".

Installation of pipeline joints and installation of the UEC system is carried out by the supplier of PI pipes - CJSC "Zavod polymer pipes" Mogilev.

The wires of the control system are connected at the junctions of the elements and led out through sealed cable outlets to the switching terminals.

Connecting cables from cable outlets to the carpet (three-core NYM3x1.5 and five-core NYM 5x1.5) are laid in protective galvanized steel pipes

d = 50 mm. Welding (soldering) of a pipe with a cable laid in it is prohibited.

Cable connection is carried out in strict accordance with color coding lived, as well as in accordance with the passport attached to each terminal. The cable from the supply pipeline must be marked additionally ( insulating tape) both at the base of the cable outlet and at the input to the terminal.

Installation of carpets, placement of terminals and connection of connecting cables is carried out in accordance with the schemes given in the project.

In this project, the length of the heating network route is 229.5 linear meters.

Terminals are used to switch signal conductors and connect control devices. the following types:

Terminal terminal "KT-11" - designed for switching conductors of the UEC system of pipelines with polyurethane foam insulation at control points; connection to the UEC system of a pulsed reflectometer. The terminal is installed wall box carpet near the entrance of the heating main to the educational building No. 3 of BelSUT;

Intermediate terminal "KT-12" - designed for switching conductors of the UEC system of pipelines with polyurethane foam insulation at intermediate points; connection to SODK pulse reflectometer. The terminal is installed in the existing ground carpet box in the courtyard of educational buildings No. 3 and No. 4;

End terminal "KT-13" - designed for looping conductors of the UEC system of pipelines with PPU insulation at the end points of the UEC system; connection to the UEC system of a pulsed reflectometer (locator). The terminal is installed in a wall-mounted carpet box in the basement of the educational building No. 1.

StroyMetService carries out adjustment, repair and also delivery to MIPC (for heating mains under construction in Moscow) with UEC.

UEC system is designed for continuous or periodic monitoring of the moisture content of the heat-insulating layer and the integrity of the wires of the UEC system. It ensures the absence external corrosion steel pipeline, guaranteeing safe and long-term operation.

UEC system is an obligatory element (included in GOST 30732-2006) of pipelines in polyurethane foam insulation.

UEC system at a cost of only 0.5-2% of total cost object depending on the volume of the order. One device (portable detector) can control several objects. The specialists of our company carry out the adjustment of the UEC system of any kind of complexity.

The system includes:

• signal copper conductors embedded in all elements of the heating network,
• terminals (connectors) along the route and at control points (central heating, boiler room, carpet),
• control devices: portable (mobile) for periodic and stationary for continuous control,
• devices for determining the exact location of damage or leakage-locators (reflectometers).

All necessary elements we complete as soon as possible.

The system is based on measuring the conductivity of the thermal insulation layer, which changes with changes in humidity. To search for fault points (moistening of PPU insulation, breaks in signal conductors), methods and devices based on pulsed reflectometry are used.

Virtues this method is its applicability for a wide range of moisture insulation and the ability to search for breaks in signal conductors in several places. Before carrying out work on the adjustment of the SODK, the customer provides an approved wiring diagram and the project of the reconstructed heating main.

Operational remote monitoring system (SOODK) is designed to monitor the condition of the heat-insulating layer of polyurethane foam (PPU) of pre-insulated pipelines and detect areas with high humidity insulation. An increase in the moisture content of thermal insulation can be caused either by moisture penetration through the outer polyethylene sheath of the pipeline, or due to leakage of coolant from the steel pipeline due to corrosion or defects. welded joints. The absence of the UEC system with channelless laying entails the possibility of corrosion of the full section of the pipeline in the area of ​​the leaky joint and contradicts the requirements for the safe operation of heating systems.

1 . Composition of the SODK system

The UEC system includes:

• Signal copper conductors in the heat-insulating layer of pipelines, passing along the entire length of the heating network:

Main signal conductor (conditionally tinned);

transit conductor

• Terminals for connecting devices and switching signal conductors at control points.
• Cables for connecting signal conductors in insulated pipes with terminals at control points, as well as for connecting signal conductors in pipeline sections where uninsulated pipeline elements are installed ( shut-off valves etc.), through elements with sealed cable outlets.
• Detector (stationary or portable).
• Damage locator.

Pipeline insulation condition monitoring should be carried out using stationary or portable detectors.

The state of the SODK should be assessed according to the following parameters:

1. Integrity of signal conductors, forming a closed electrical circuit (loop) in the normal state.

2. Insulation resistance between signal conductors and steel pipeline.

Signal conductors must be installed inside the PPU insulation of each pipeline. The resistance of the signal conductors should be within 0.012 - 0.015 ohms per linear meter.

For switching signal conductors and connecting control devices, it is necessary to use terminals of the following types:

■ end terminal - at control points at the ends of the pipeline;

■ end terminal with access to a stationary detector - at the control point at the end of the pipeline, where a stationary detector is provided;

■ intermediate terminal - at an intermediate pipeline control point;

■ double end terminal - at the control point on the border of the project;

■ merging terminal - at those control points where it is necessary to combine two (three) sections of pipelines into a single loop;

■ through terminal - for connecting connecting cables in places where PPU insulation breaks (in thermal chambers, in basements of houses, etc.) and when the length of the connecting cable is more than 10 meters.

Determining the location of the SODK malfunction (moistening or breakage of the signal conductor) is carried out by a damage locator, which is a pulse reflectometer.

Damage locator:

• must provide the ability to determine the type and location of defects with an accuracy of at least 1% of the measured length of the signal conductor;
• have a measurement range of at least 3000 m;
• To register the measurement results, the locator must have internal memory for recording and storage with a volume of at least 20 reflectograms and the possibility of data exchange with a personal computer. It is allowed to use the reflectometer with a portable printer.

2. Design rules for UEC systems

The project of the operational remote control system includes:

• explanatory note
• specification of equipment used (including materials)
• general instructions, including a list of documentation for the commissioning of the control system, marking of carpets and terminals and requirements for the installation of the control system
• remote control circuit
• wiring diagram of the heating system

The scheme of the UEC system should include:

• graphical representation of the connection diagram of signal conductors
• characteristic points corresponding to the wiring diagram:

Branches from the main trunk of the heating main (including downcomers)

Turning angles

Fixed supports

Diameter transitions

Control points (ground and wall carpets)

• data table for characteristic points with parameters:

Point numbers

Pipe diameter on site

Pipeline length between points project documentation(for supply and return pipeline)

The length of the pipeline between points according to the joint scheme (for the main and transit signal conductors for the supply and return pipelines)

• marking on terminals (on aluminum tags)
• specification of the applied devices and materials.

3. Conventions elements of SODK

The design of the UEC systems must be carried out with the possibility of connecting the designed system to the existing systems of the UEC and those planned in the future.

When designing systems, it is necessary to provide for monitoring the state of insulation of an extensive network of pipelines based on the maximum range of the detector (five kilometers of the pipeline).

As the main signal wire, a wire is used, marked located on the right in the direction of water supply to the consumer on both pipelines (conditionally tinned). The second signal conductor is called transit.

All side branches must be included in the break of the main signal conductor. Do not connect side branches to copper wire, located on the left along the water supply to the consumer (transit).

Insulation condition monitoring should be carried out by a stationary detector. If it is not possible to connect a stationary detector, the control can be carried out using a portable detector. At the control points at the ends of the heating network, end terminals are installed, one of which can have access to a stationary detector.

An example is a SODK scheme for a section of a heating main less than 100 m long with any of the detectors (see diagrams).

For pipelines with a length of less than 100 meters, it is allowed to install only one control point with signal conductors looped under a metal insulation plug at the other end of the pipeline. Some operating organizations in Moscow require the organization of control points on both sides of the heating main.

Control points must be provided every 250 - 300 meters. Intermediate terminals are installed at the indicated points. An intermediate terminal is installed at the beginning of side branches 30-40 meters long, regardless of the location of other control points on the main pipeline.

At the boundaries of conjugated projects, at the junctions of the routes, it is necessary to provide control points and install double end terminals, which allow you to combine or disconnect the SODK of these projects.

Example of a heat network with double terminators, spurs and control from both sides

In places where PPU insulation breaks (pipelines pass through thermal cameras, basements of buildings, etc.) the connection of signal conductors is carried out by cable jumpers through the through terminals or by organizing a control point with a through terminal in the ground carpet.

Installation of terminals with connectors for switching in rooms with high humidity (thermal chambers, basements of houses, etc.) is not recommended. In such cases, walk-through terminals are installed.

Heat network examples:

Scheme of SODK with a thermal camera with a ground carpet

The SODK scheme with walk-through terminals in the basement of the house (chamber)

The maximum cable length from the pipeline to the terminal should not exceed 10 meters. If it is necessary to use a cable with a longer length, an additional terminal must be installed as close as possible to the pipeline.

Installation of terminals at intermediate and end points of control is carried out in ground or wall carpets of the established sample. At the end points of the pipeline, it is allowed to install terminals in the central heating station. The design of the carpet must exclude the formation of condensate on the elements of the terminal, the penetration of moisture into the terminal and ensure ventilation of the internal volume of the carpet. The internal volume of the carpet should be covered with dry sand from the base to a level of 20 centimeters to the top edge. When installing carpets on heating mains laid in bulk soils, it is necessary to provide additional measures to protect the carpet from the drawdown of the pound.

The connecting cable from the pipeline element with a sealed cable outlet to the terminal must be laid in a 50 mm galvanized pipe. Welding (soldering) of a protective galvanized pipe with a cable laid in it is prohibited.

The laying of the connecting cable inside the tasks (structures) to the place where the terminals are installed or at the place where the thermal insulation breaks (in the thermal chamber, etc.) must also be carried out in a 50 mm galvanized pipe, fixed to the wall with brackets. Inside buildings, the use of protective corrugated hoses is allowed.

The scheme of the UEC system should have in the stamp the surname and initials of the developer and the name of the organization that developed the project. The design of the UEC system must be agreed with the organization that accepts the heating main for balance.

If it is necessary to make changes to the UEC scheme, these changes must be re-agreed with the operating organization.

4. Rules for installing the UEC system

1. Installation of SODK should be carried out in accordance with the design scheme agreed with the operating organization.
2. When insulating joints, the signal conductors of adjacent elements of pipelines must be connected by means of crimp sleeves, followed by soldering of the junction of the conductors. Soldering must be done with inactive fluxes.
3. All side branches from main pipeline must be included in the break of the main signal conductor of the main pipeline. The transit signal conductor must only run in the main pipeline.
4. When isolating joints located at the boundaries of pipelines of various manufacturers or various construction organizations, work must be carried out in the presence of representatives of these organizations with the preparation of an act for the work performed, signed by representatives of all organizations.
5. At control points, connecting cables must be connected to the signal conductors through sealed cable outlets.
6. The design of cable outlets must ensure tightness during the entire service life.
7. At control points and transits in chambers and basements of houses, NYM 3 × 1.5 and NYM 5 × 1.5 brand cables with color marking of cores are used as connecting cables. In conditions low temperatures it is necessary to use the cable brand KGKhL 3x1.5 or KGKhL 5x1.5.
8. The connection of cable cores at intermediate control points with signal conductors in a pre-insulated pipe must be made in accordance with the following color marking:

Blue is the main signal conductor going from this control point towards the consumer.

Brown - a transit signal conductor going from this control point towards the consumer.

Black is the main signal conductor coming from this control point in the direction opposite to the coolant supply.

Black and white - a transit signal conductor coming from a given control point in the direction opposite to the coolant supply.

Yellow-green - contact on the steel pipeline ("grounding").

1. The contact of the yellow-green core with the steel pipeline must be ensured using a detachable threaded connection(a nut with a washer on a bolt welded to a steel pipeline).
2. Piping connecting cables must be marked to identify the respective pipes and cables.
3. Connecting connecting cables to terminals at control points must be carried out in accordance with the color marking and the corresponding instructions, which must be attached to each terminal.
4. Mounting terminals installed at control points must comply with a protection class of at least IP 54. Terminals installed in places with high humidity (heat chambers, basements of houses with a risk of flooding) must have a protection class of at least IP 65.
5. Aluminum tags with markings indicating the direction of measurement must be attached to the terminals.
6. If it is necessary to install a cable longer than 10 meters at the control points, an additional terminal should be installed.
7. Installation of fixed fault detectors must be carried out in accordance with the operating instructions.
8. Upon completion of the installation of the UEC system, an examination should be carried out, including:

• measurement of insulation resistance of each signal conductor;
• measuring the resistance of a circuit (loop) of signal conductors;
• measuring the length of signal conductors and lengths of connecting cables at all control points;
• measurement of reflectograms of signal conductors.

All results of the changes are entered into the SODK survey report. The act of delivery of the SODK can be seen below ..pdf "].

5. Rules for acceptance of UEC systems into operation

1. Acceptance of the UEC systems should be carried out jointly by representatives of the construction organization and the organization that installed and adjusted the UEC system, together with representatives of the operating organization.
2. Upon acceptance into operation of the UEC system, the operating organization must be provided with the following documentation and equipment:

Scheme of remote monitoring of the pipeline condition with a completed table of pipeline lengths by sections (supply and return pipelines according to design scheme pipeline and according to the joint scheme);

Joint scheme;

Situational plan;

Control devices (damage detectors, locators, etc.) with accessories (if any) and with technical documentation for their operation - according to the project.

1. In the presence of representatives of the operating organization, the construction organization and the organization that carried out the installation and commissioning of the UEC system, the following are carried out:

Measurement of ohmic resistance of signal conductors;

Measurement of insulation resistance between signal conductors and ground;

Recording reflectograms of a heating network section using an impulse reflectometer for use as a reference during operation;

Checking if the setting is correct control devices(locators, detectors) transferred for operation for this order.

1. All measurement data and initial information are recorded in the act of inspection of the system of operational remote control of the heating main.
2. The UEC system is considered operational if the insulation resistance between the signal conductors and the steel pipeline is not lower than 1 MΩ per 300 m of the heating main. For pipelines with a length different from the specified one, permissible value insulation resistance varies inversely with the length of the pipeline.

UEC system is designed for continuous or periodic monitoring of the state of the heat-insulating layer and detection of places of moisture insulation. The appearance of moisture may be associated with damage to the outer polyethylene sheath or leakage of coolant from the steel pipe due to corrosion or defects in welded joints.

SODK allows you to control the quality of installation and welding of a steel pipeline, factory insulation, insulation of butt joints, prevent accidents during the operation of a heat pipeline and, ultimately, ensures long-term, reliable and safe work thermal networks.

SODK is an obligatory element (included in GOST 30732-2006) of pipelines in polyurethane foam insulation.

SODK in terms of cost is only 0.5-2% of the total cost of the object, depending on the volume of the order. One device (portable detector) can control several objects.

The system includes:

• signal conductors in the heat-insulating layer of pipelines, passing along the entire length of the heating network;
• terminals for connecting devices at control points (central heating, boiler room, carpet) and switching signal conductors;
• cables for connecting signal conductors to terminals at control points, as well as for connecting signal conductors in pipeline sections where bare elements are installed;
• portable detectors (9 V) for periodic and stationary detectors (220 V) for continuous monitoring;
• locators (pulse reflectometers) - devices for determining the exact location of damage or leakage;
• insulation testers.

AT system UEC "MosFlowline" principle of operation NORDIX(used in 95% of all existing European systems). The system is based on the measurement electrical conductivity thermal insulation layer, which changes with changes in humidity. To search for fault points (moistening of PPU insulation, breaks in signal conductors), methods and devices based on pulsed reflectometry are used.

The advantages of this method are its applicability for a wide range of moisture insulation and the ability to search for breaks in signal conductors in several places.

Our company has developed and supplied its own devices of the UEC system: portable and stationary detectors, terminals with plug connectors, as well as new generation detectors with 4 levels of humidity indexing, which allows you to track the dynamics of an emergency and assess its severity. The detector has no analogues in the world.

Specialists of the SODK department perform the following work:

• periodic monitoring of the state of signal conductors during the period of isolation of butt joints and troubleshooting;
• extension of cable outlets and installation of terminals and control devices at control points in accordance with the SODK project;
• examination of the mounted SODK with the preparation of an appropriate act of readiness for delivery;
• joint acceptance and transfer of the system to the operating organization with the construction company;
• consultations on SODK representatives construction company;
• search for damage to the system during the warranty period at the request of the operating organization.