Repair of main pipelines. Existing methods of repairing pipelines Carrying out work on the repair and assembly of the pipeline

During the current repair, defects noticed during operation are eliminated. Pipelines that coke or corrode during operation in process plants must be inspected and cleaned.

The scope of repair work includes:

inspection and repair of all supports and suspensions;

elimination of leakage in flange connections, tightening of flanges, change of gaskets;

checking the position of compensators;

checking valve seals;

checking the tightness of fittings;

replacement of worn pipelines.

Pipelines to be repaired must be completely emptied of the product.

Leaks in existing pipelines are determined visually, by drips, smell or a change in the pumping mode. The gaps along the body of the pipe or in the welds can be eliminated by applying clamps, which are made according to the shape of the pipe. Installed in such a way that when tightened, the gasket (asbestos, rubber, lead, fluoroplastic will hurt) remains sandwiched between the pipe and the clamp and fills the leaks. The clamp must have sufficient strength and rigidity for greater strength, the clamp is welded to the pipe. The material of the gaskets depends on the operating conditions of the pipeline. The gasket must not be dissolved or destroyed by the medium during long-term operation under working conditions. Ordinary rubber can be used at temperatures not exceeding 50 degrees. In pipelines for steam, gas, oil products, hot water and other liquids, at pressures up to 40 at. and temperatures up to 400 degrees, paranite gaskets are installed.

The accident caused by the rupture of the weld is eliminated by removing the defective area with subsequent welding. If the area is large - it is replaced. To do this, the pipeline is freed from the product and a section equal to at least one pipe diameter is cut out. Instead, a piece of pipe is welded.

Pipeline testing.

Upon completion of installation, and periodically after repair, pipelines pass hydraulic strength and density test , then washed and purged, and additionally tested for tightness with air or inert gas.

To do this, the pipeline at both ends will be plugged with welded plugs with air release valves, all installed fittings should be fully opened, mounting coils should be installed in place of control valves and measuring devices, and instrumentation fittings should be plugged. Testing with thermal and anti-corrosion insulation is allowed.

The pipeline is filled with water with a temperature of 5-40 degrees, but so as not to cause sweating. If the temperature is below 0, then measures against freezing are taken.

The piston pump creates the necessary pressure of crimping 1.25-1.5 from the working one, but not less than 2 atm.

Pressure oil pipelines must be subjected to a hydraulic test at a test pressure that is one and a half times the working pressure.

When filling with water, completely expel all air.

Increase pressure slowly. The rate of pressure rise must be specified in the project documentation. Do not use compressed air or gas to raise the pressure.

Disconnect the pipeline from the pump.

Withstand 10 minutes (strength test) and check: no drips, bulging and gusts.

The pressure must be controlled by two pressure gauges, accuracy class not lower than 1.5, with a diameter of at least 160 mm and a scale of 4/3 of the measured one. One is installed near the unit, the other at a remote point.

After that, the pressure is reduced to the working one and a thorough inspection of the welds is carried out (density test). During the inspection, tapping with a hammer weighing no more than 1.5 kg is allowed. During the pneumatic test, tapping is not allowed.

At the end of the inspection, the pressure is again increased to the test pressure and maintained for another 5 minutes, after which it is again reduced to the working one and the pipeline is carefully inspected again.

The duration of the tightness test is determined by the time of inspection and checking the tightness of detachable connections.

Then the air vents are opened and the pipeline is emptied through the drains.

The results are satisfactory if there are no breaks, visible deformations, pressure drop on the pressure gauge, no leaks and fogging. Undercutting of welded seams is prohibited.

If the results are unsatisfactory, the defects are eliminated, and the tests are repeated. The results are documented in an act or entered in the pipeline passport.

It is allowed to replace the hydraulic test with a pneumatic one in the following cases:

if the supports are not designed for the weight of water;

at T below 0 and danger of freezing;

if fluid is not allowed.

Subject to control testing by the method of acoustic emission and positive air temperature.

Pneumatic strength and density test produced by air or inert gas. Raise the pressure smoothly at a rate of 5% of R pr per minute, but not more than 2 atm per minute with periodic inspection of the pipeline at pressures up to 2 atm twice, more than 2 - 3. during the inspection, stop the pressure rise.

Leaks are identified by sound and soap emulsion.

For the duration of the tests, mark with flags a security zone of 10 m for underground laying and 25 m for above-ground, in both directions, and set up posts after 200 m. During the rise in pressure, the presence of people in the security zone is prohibited.

Compressors and pressure gauges should be located outside the security zone.

After the end of the hydraulic test, the pipeline is emptied and purged with air until the water is completely removed. Then, additional pneumatic tightness test air or inert gas under operating pressure for 24 hours new and at least 4 hours repaired.

The rate of pressure drop after holding to equalize the temperature is determined. The temperature is controlled by thermometers at different ends of the pipeline.

The pressure drop must be at least 0.2% per hour.

During operation, pipelines wear out from mechanical (mainly erosive), thermal and corrosive effects. During the repair, the following main works are performed:

1) replacement of worn parts and assemblies or their correction to the relevant standards, tolerances and sizes;

2) alignment of pipelines, and, if necessary, adjustment of supports and hangers;

3) modernization or reconstruction of pipelines with possible unification of replacement parts;

4) isolation of pipelines;

5) strength and density test;

6) painting of pipelines.

For 2 - 3 hours before disassembling the flange connections of pipelines, the threaded part of the fasteners must be moistened with kerosene. Unscrewing the nuts is carried out in two steps: first, all nuts are loosened by turning 1/8 of a turn, then they are completely unscrewed in any sequence. When disassembling pipelines in order to replace gaskets, it is very laborious to expand the flanges. To expand the flanges, special devices are used.

Figure - Screw attachment for expanding flanges

Figure - Gasket replacement tool

1 - collar; 2 - screw; 3 - bolt.

For cutting gaskets, special tools are used.

Figure - Device for cutting gaskets

1 - cone; 2 - knife.

When repairing technological pipelines, worn sections are replaced with new ones, defective welded joints are removed, and coils are welded in their place. Before removing a pipeline section, it is necessary to secure the sections to be separated in such a way as to prevent their displacement. The section to be removed is attached in two places.

After dismantling the pipeline section, the free ends of the remaining pipes must be closed with plugs or plugs. When installing a new section, it is first strengthened on supports, and then welded.

Collector assembly consists of connecting individual sections, blocks (lashes), parts and attaching it to supports and suspensions. Separate components before assembly are located in the workshop between the devices, pumps, fittings. First, the assembly is carried out "roughly", i.e. parts to be welded are connected with a tack, flange connections are assembled on mounting bolts. After such assembly and alignment of the horizontal and vertical sections, the final welding of the joints is carried out, and in the flange joints, the mounting bolts are replaced with studs or permanent bolts with their final tightening. After that, the pipeline is fixed on the supports.

Lifting and laying of components and parts of pipelines is carried out using stationary or mobile lifting devices. When assembling individual sections of pipelines, the transfer of their weight to pumps and compressors must be excluded.

On vertical apparatus, replaceable components and parts of pipelines are fixed with slings in two places for their suspension.

When connected to other nodes, reslinging is excluded. The raised assembly or part is fitted with a mandrel to the mounting flange, and then the gasket is installed and all the studs and bolts are fixed. After carrying out these operations, the slings are removed. If a new pipeline assembly is joined by welding, then the slings are removed after welding with its first seam.

When repairing flanged connections, the mirror of the flange that was in operation is cleaned of old gaskets, traces of corrosion, etc.

The perpendicularity of the sealing surface of the flange to the axis of the pipe is checked using a special tool.

Figure - Checking the perpendicularity of the flange sealing surface

to the axis of the pipe

When repairing intershop pipelines, the replacement of worn sections of above-ground pipelines can be carried out pipe by pipe. It is also possible to assemble sections from sections that are assembled and welded from individual pipes and their elements near the route or in a pipe shop. In conditions of overpasses saturated with a large number of pipelines, repairs become more difficult. In this case, the replacement of worn sections or the laying of additional lines is possible only with individual pipes of short length. The pipes are lifted by a crane or winch and brought into place through the top or side of the overpass. Assembly is carried out in the direction opposite to the slope of the pipeline. When laying pipelines on overpasses, in channels or trays, the final fixing begins with fixed supports.

When replacing sections of pipelines operating at high temperatures, as well as when laying additional lines, stretching of expansion joints is carried out.

Stretching of compensators is carried out with the help of special devices, together with which the compensator is mounted. After fixing the ends of the pipeline on fixed supports, the device is removed.

Figure - Screw fixture for stretching expansion joints

1 - spacer; 2 - tension nut; 3 - screw; 4 - clamp; 5 - pipe.

Lens compensators are installed on pipelines with longitudinal and transverse movements. To prevent rupture of the lenses when the pipeline is shifted in the transverse direction, ties are placed on the compensators. Lens compensators are stretched to half their compensating capacity.

Figure - Lens compensators with ties

1 - thrust; 2 - paw.

When repairing pipelines laid in the ground, the following main works are performed:

1) opening backfilled trenches; disconnection of pipeline sections;

2) the rise of these areas to the surface;

3) cleaning the outer surface from traces of corrosion and remnants of the old anti-corrosion insulation;

4) replacement of worn sections of pipelines with new ones;

5) the imposition of new insulation;

6) laying the pipeline in a trench.

In the presence of minor damage (cracks, shells, sweating, etc.), the pipeline is not switched off from work. With non-toxic products, repairs are carried out by welding on patches. Joint gaps and large cracks are temporarily isolated by applying clamps. After the pipeline is freed from the product, the damaged areas are cut out and the coils are welded in.

Pipelines with a diameter of up to 300 mm, laid at a depth of not more than 1.2 m, are repaired with lifting and laying them over the trench on sunbeds. With a diameter of more than 300 mm, the repair is carried out directly in the trench with the rise of pipelines to a height of 60 - 70 cm from the bottom of the trench with their laying on the deck chairs.

The main type of repair of underground pipelines is the replacement of a worn section with a new one. With this method, the pipeline extracted from the trench is cut into separate parts and taken to the repair base. The new section is welded into the manifold. When lifting and lowering the pipeline into the trench, the most stressed welded joints are reinforced with couplings or strips. For a better fit of the strips to the pipeline, a bend is made in the middle of the strips. When reinforced with couplings, their length is assumed to be 300 mm for pipes with a diameter of 200 - 377 mm and 350 mm for pipes with a diameter of 426 - 529 mm. The diameter of the coupling is assumed to be 50 mm larger than the diameter of the pipeline. The wall thickness of the coupling and the pipeline must be the same. The allowable gap between the coupling and the pipe is 2 mm.

When repairing, it is sometimes necessary to connect to the existing pipelines of neighboring workshops. Such a need also arises when a new apparatus is connected to existing shop pipelines. Such tie-ins are most often carried out during shutdown repairs. Tapping into the existing pipeline is carried out using a special device. A branch pipe with a flange is fitted and welded to the pipeline at the tie-in point. A gate valve of the required series is attached to this studded flange. A fixture is attached to the valve on the flange, consisting of a drill and a crown, on which cutters, a stem, an oil seal, a grundbuksa, a thrust ball bearing and a handwheel are mounted. By rotating the crown with a handwheel, a hole of the required diameter is cut out in the wall of the main pipeline. After that, the stem with the crown rises above the gate valve clinket and the latter closes. Then the device is removed from the valve and a new pipeline is connected to the outlet pipe.

Figure - Device for tapping a branch into an existing pipeline

1 - pipeline; 2 - drill; 3 - cutter; 4 - crown; 5 - branch pipe; 6.9 - flanges;

7 - stock; 8 - valve; 10 - stuffing box; 11 - grundbuksa;

12 - thrust ball bearing; 13 - steering wheel.

After the overhaul of pipelines is completed, the quality of work is checked, flushed or blown, and then tested for strength and density. Technological equipment is switched off before testing, the ends of the pipeline are closed with plugs. All inserts for control and measuring devices are muffled. At the lowest points, fittings with fittings for draining water during a hydraulic test are welded in, and at the highest points - air vents for air release. At the beginning and end points of the pipeline, pressure gauges with a measurement accuracy class of at least 1.5 are installed.

A hydraulic strength and density test is usually carried out prior to coating with thermal and anti-corrosion insulation. The value of the test pressure must be equal to 1.25 of the maximum working pressure, but not less than 0.2 MPa for steel, cast iron, vinyl plastic and polyethylene pipelines. The pressure during the test is maintained for 5 minutes. After that, it is reduced to the working value. The pipeline is carefully inspected. Welded seams are tapped with a light hammer. After the test, the air vents open and the pipeline is completely freed from water.

The pneumatic test is carried out with air or an inert gas. At the same time, a pressure equal to 1.25 of the maximum working pressure is maintained, but not less than 0.2 MPa for steel pipelines.

Strength testing of cast iron and plastic overhead pipelines is not carried out. Pneumatic testing of pipelines for strength is also not carried out in existing workshops, on racks, in channels, i.e. where the existing pipelines are located. Gas pipelines operating at pressures up to 0.1 MPa are tested with pressure, which is established by the project.

Repair of pipelines without digging trenches

Today, technology is gaining popularity, the use of which is convenient and effective in the event that pipes are laid underground or external sewage systems, pipes are repaired without digging out asphalt. This method is gradually replacing all other known repair methods, since it is very convenient and affordable. For repairs, polyethylene pipes are used, which are not only cheap, but also very easy to install, and also have a long service life. This method of repairing pipes can also be used if they are laid in hard-to-reach places, for example, under a road.

It is possible to repair pipes without resorting to digging trenches, if you lay a new pipe in the old one - relining, or destroy the old pipe and lay a new, larger diameter - burstlining.

The old pipe is destroyed by pulling into it an installation with knives and an expander, which, moving along the entire pipe, presses the fragments into the ground. When all the main stages are completed, they begin to lay a new pipe with a larger diameter. This method is especially important when it is necessary to increase the transported flow.

It is possible to increase the fluid flow through the pipes by making the pipe walls smoother and by reducing the fluid resistance.

Until quite recently, the trenchless method of rehabilitation was something of a fantasy, everyone used the trench method, carried out earthmoving work and laid pipes in the open. It cannot be said that the open method is bad, it has many of its advantages, but it loses a lot in comparison with the trenchless method of laying communications.

The trench method consists in the fact that a hole of a certain size is dug in the ground, into which pipes are laid. After the pipeline is installed and the seams are welded together, the trench is buried, but a fairly large area after such work looks, to put it mildly, ugly. The state of the fertile layer of soil and asphalt is severely disturbed, and all shrubs, flowers, and trees are destroyed. Also, in the process of work, it becomes necessary to block traffic and build bypass roads. Trench work is carried out for a very long time, sometimes for several weeks.

Not many customers took on the task of laying pipes under large obstacles, such as railways and large buildings, because this method was not only expensive, but also very inconvenient. However, the situation has greatly changed for the better with the advent of such an innovation as trenchless laying of pipelines. Now it is possible to lay pipes without resorting to earthworks and, accordingly, to opening the soil, and after they have been carried out, there is completely no need to lay new asphalt and sidewalks, repair rails and apply road markings. The state of the environment is preserved, all city parks, gardens and squares remain in place.

The main positive aspects of closed construction and replacement of damaged sections of pipes are: the costs of work, materials and equipment are reduced several times, the amount of time spent on work is reduced, largely due to the absence of the need to dig trenches, the time of work and the time for receiving documentation for obtaining building permits. For work, fewer people are hired, and the number of workers is almost halved.

It also causes virtually no environmental damage. Work can be carried out even if the thermometer shows below zero degrees, and there is snow on the streets.

The safety of workers and residents of the area where work is underway to build communications or replace some sections of the main pipeline is increased several times.

In some cases, it may be necessary to carry out work under a transport highway, under a federal highway. Most often they resort to making a puncture under the road and the subsequent laying of pipes. In this case, you can not involve heavy equipment in the work, just one, but multifunctional and powerful installation is enough.

A cylinder is installed at the puncture site, to which a drill rod is attached. As the rod and cylinder move, the soil expands and compacts to make room for the new pipe.

Before starting work on puncturing the soil, you only need to make a cylinder of the desired diameter. It must exactly match the size of the pipe being laid.

Also, with the help of a cylinder, it is possible to carry out manual development of the earth under the road, in the event that a puncture is made on both sides of the road. However, in some cases, the puncture has a length of more than ten meters, in which case special equipment is involved.

The most famous ways of laying pipelines:

The first, widely used and practical method is refurbishment, divided into two types - relining and renovation.

Relining is understood as such a rehabilitation method, with the help of which polyethylene channels of a slightly smaller diameter are installed in an already existing pipeline. However, before pulling, you should thoroughly examine the surface of the pipe, clean it from dirt and foreign parts. There is a decrease in the size of the hole in the pipe, while this does not affect the throughput at all. The smooth walls of the new pipe do not create resistance.

Another type of rehabilitation - renovation, is carried out approximately the same way as the destruction of the pipe with the expansion of the diameter of the new one. This can be done using a special installation - destroyer - expander. This method is used if there is an urgent need to increase the diameter and throughput of the pipe.

Another method of trenchless rehabilitation and pipe laying is called piercing. With it, you can lay a pipeline of small diameter. In order to lay pipes in this way, workers must dig two small holes on either side of the pipe to be replaced. The diameter of the pit is determined based on the performance of the pipeline. A hydraulic jack is installed in one pit. Due to the operation of the jack, the process of punching the pipe through the well cavity is carried out directly. A cone is fixed on the new pipe, which subsequently exits from the other side.

In the process of work, the pipe is constantly growing, new sections are welded to it. One by one, they are fixed until the desired size of the whip is formed. Due to the movement of the cone, the soil is not only moved apart, but also compacted.

Once the work is completed, all equipment is removed. The new pipe is safely hidden in a kind of casing from the old pipe. However, in this case, it must be taken into account that the load on the pipeline section will increase, so this method is not suitable for all types of pipelines. In particular, it is not suitable for puncturing under a building. If you need to replace a large section of pipes in this way, you will have to dig out sections for installing a jack in several areas.

Separately, it should be noted such a method as punching. With its help, the size of the pipe is increased. The difference from piercing is that a cone is not fixed at the end of the pipe, after which the pipe is pushed into the ground, installed with an open end and pushed inward. As a result, it is necessary to remove the earth from the pipe.

The most popular and widely used method is called HDD. With it, you can lay any kind of communications at various depths using only one HDD installation. In this case, it is possible to carry out laying over much longer distances, as well as increase or maintain the diameter of the pipeline. There is also an opportunity to bypass various obstacles. The operator can change the trajectory of the drill.

HDD works are performed in three stages:

First of all, a pilot well is being laid. This stage is very important, the result of the work will depend on how it is carried out. To drill and compact the soil, a special head made of hard material is put on the end of the drill rod. It is connected in such a way that it is possible to rotate the head in different directions. It is due to the movement of the head that various obstacles are released on the path of penetration.

To cool the head and drill rod, as well as facilitate penetration, a special solution is supplied from the end of the drill head. The HDD operator can observe the drilling process while sitting in the rig. With the help of a special camera, the image is transmitted to the screen, data on the slope and azimuth are also recorded. As soon as it becomes clear that the drill is going in the wrong direction, the equipment is turned off, after which the trajectory of the drill is corrected. Depending on how accurately the calculations are made, you can correct the situation. To do this, the drill is given the correct trajectory and gradually leveled.

In the process of drilling, it is possible to expand the well. As soon as the pilot well is drilled, the equipment is partially dismantled - the head is disconnected from the drill rod and the expander is connected. As the expander passes through the pipeline, the diameter of the well increases, and, consequently, the diameter of the pipeline. It is recommended to expand in several stages in order not to break the equipment. It is also necessary to take into account that in order for the pipe to easily pass through the well, the hole must be slightly larger than the diameter of the pipe. If you make it smaller, then the pipe string in the process of not pushing, but pushing into the well, can simply break.

You should also pay attention to such a method as pulling the pipeline into a new well. To do this, welded pipes are fixed with an expander and a special hinge. Due to the operation of the HDD unit, the pipe is gradually pulled into the drilled well. Also, as in other methods, drilling fluid is used in the pulling process, only for the most part not to cool the equipment, but to facilitate penetration, and to prevent pipe breakage.

In this way, you can eliminate the leak in the old pipeline. Leaks most often occur when pipes burst or crack. This problem appears quite often and, with proper work, is quickly eliminated.

It is necessary to eliminate all detected problems as quickly as possible, for the reason that the process of destruction only intensifies over time, and if it is not difficult to cover up a small crack, then it is not as easy to cover up a large crack covered with corrosion as it might seem. Moreover, if a crack has formed on the walls of the water supply, the supplier of drinking and industrial water may suffer very large losses.

The closed method of building highways was developed and put into widespread use, the problem with pipe leakage could only be eliminated by forging huge trenches and replacing some sections of pipes. On average, such work would last about a week, while today malfunctions and defects are eliminated in one day.

Also, trench repair was associated with the appearance of a large amount of dust, dirt, which was also released into the atmosphere. Residents of residential areas often complained that they could not sleep because of the noise produced by the drilling rigs. Today, all these inconveniences can be forgotten - the work is carried out as quickly as possible and with high efficiency.

In fact, there are few options for breakdowns that can lead to a system malfunction. The first step is to prevent leaks as much as possible. They can occur both at the joints and in case of mechanical damage to the pipe body. Replacing water pipes or fittings used for connection in this case will be the simplest, fastest and at the same time inexpensive method of restoration.

Special attention is required for outdoor systems that are laid underground. Stocking repair of pipelines is one of the main modern techniques that allows you to restore the operation of the existing system in such a way as to avoid the need to open the trench.

The main signs that require the rehabilitation of pipeline systems are:

deterioration of physical and chemical parameters of water;
reduction in their pressure, throughput;
occurrence of water leaks;
service life more than 20 years without repair.

Repair of the pipeline by the stocking method allows not only to eliminate the problems that have arisen, but also to carry out diagnostics of the existing system with high efficiency.

Thus it can be done:

cleaning the inner surface from deposits formed during operation;
examination of the state of the system;
restoration with the use of a sleeve (stocking) coating.

As a result of the use of stocking technology, the repair and replacement of the heating pipeline are carried out with maximum efficiency and economy.

Heating main repair

Repair of heating mains almost always becomes a rather difficult task, requiring the involvement of specialized specialists. One of the most effective methods of preventing emergencies is the timely implementation of repair and restoration work and regular preventive maintenance. With this approach, as practice shows, a complete replacement of heating systems will be required much less frequently, due to an increase in the service life by several times.

Features of the repair of heating networks in Moscow are determined based on the parameters of the system itself. First of all, the method of laying pipelines is taken into account. When using an open ("air") way, the technology for performing work, as a rule, is greatly simplified, which leads to a reduction in maintenance costs and the time required for troubleshooting, performing urgent emergency repairs of the heating main.

For pipelines laid in the ground today, the method of trenchless repair and restoration is most relevant. In its use, the overhaul of heating networks will be carried out as efficiently as possible, even taking into account the difficulties of performing any such work in the conditions of the capital. Its essence will be to destroy the old pipeline using a pneumatic punch, and then, advancing the polymer pipe, destroy the worn out old structures.

Plumbing repair

Plumbing repair external is done by the operating organization or contractors specializing in this area of work. Increasingly, their implementation is done without dug trenches, damaged road surfaces, violations of the design of the adjacent territory.

Performing urgent repairs to the water supply, work is being done to eliminate leaks, the need to start the system after a long break in operation, the appearance of extraneous noise. Experience in this area convincingly proves that, if possible, it is worth eliminating faults as soon as possible in order to avoid high costs. Otherwise, the emergency repair of the water supply will be associated with a break in the water supply, the need for more complex restoration work and the elimination of flooding caused by a leak.

pipeline repair cost

Pipeline repair price There are several determining factors that influence the replacement of pipelines and their reconstruction.

The purpose of the pipeline system (sewerage, water, heat supply).
Type of system (collector, main, internal pipeline).
The material for the manufacture of pipes (the complexity of performing operations for welding, cutting, making connections depends on it).
The degree of contamination of the network (the estimate for the repair of a heating main or water supply may include additional cleaning of the system).
Depths of pipeline laying, relief features (prices for repair of heating mains, water supply networks increase significantly when working on rocky areas or sandy soils).
The complexity of the route (the presence of a large number of turns, building density).
seasonal factor

Our company offers its services for the repair of pipelines. We are ready to offer the best prices for the repair of heating mains in Moscow with a guarantee of quality for all types of work. To complete the tasks in the shortest possible time, we have the whole range of necessary special equipment. Contact us!

Troubleshooting and repair of the pipeline are carried out in accordance with the materials from which the pipeline is made, as well as the reasons for which the repair or replacement of a separate section of the pipe was required.

How are pipelines repaired?

Broach inside the old pipe. The technology, which involves pulling new pipes inside old ones, is most effective when it is necessary to seal joints or replace damaged areas. If a pipe of a much smaller diameter is selected, the space between the walls is sealed with a special mounting solution. A possible disadvantage may be a slight reduction in throughput, due to a decrease in the diameter of the pipeline.

Broach along the old highway with the destruction of the pipe. In accordance with this technology, a new pipe is being laid, with parallel destruction and exhaust of the old one. Laying along the old route is relatively easy, as the trench walls are well compacted. For this technology, hydraulic equipment is used to simultaneously pull and push the pipe. Welding of seams is carried out immediately before broach, which allows laying pipelines of various lengths. This technique is relevant if a major overhaul of field pipelines or domestic pipelines is carried out. When laying, it is possible to install pipes of the same diameter and from the same material, which allows you to maintain the original performance.

Joint replacement. Most accidents occur at welded joints, as a welded joint is less stable than a solid pipe. Replacement and local repair of welded joints of pipelines are carried out with excavation, open method, followed by replacement of a part of the pipeline and the manufacture of a new weld.

Local replacement of pipeline sections. If a separate section is damaged and an emergency repair of the pipeline is required, two pits are dug at the inlet and outlet of the pipe to carry out the work. Next, the pipe is laid in accordance with the measured size of the damaged area. Couplings are installed, joints are welded.

Pipeline cleaning. Cleaning is necessary to restore the throughput of pipes in case of blockages that occur during operation. Mechanical cleaning is possible with the help of a bailer or pulling through a steel ruff. Hydrodynamic cleaning may be used, provided that the pipes can withstand the pressure and stress generated by the removal of contaminants.

Why you should contact us

It is worth choosing the services of our company due to the professionalism and quality of the work performed. Experienced craftsmen are involved, advanced equipment is used. All work performed is covered by a quality guarantee. We implement projects and carry out repairs of any complexity, with the necessary efficiency of work. The cost is at an affordable level, a preliminary estimate is created that takes into account all the costs of the service. Call to find out more.

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