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Carrying out pipeline repair and assembly work. Repair of main pipelines. Self-replacement of eyeliners

During operation, pipelines wear out from mechanical (mainly erosion), thermal and corrosive effects. During repairs, the following main work is performed:

1) replacing worn parts and assemblies or correcting them to the appropriate standards, tolerances and dimensions;

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) pipeline insulation;

5) test for strength and density;

6) painting of pipelines.

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

Figure - Screw device for spreading flanges

Figure - Gasket replacement device

1 – clamp; 2 – screw; 3 – bolt.

Special tools are used to cut gaskets.

Figure – Device for cutting gaskets

1 – cone; 2 – knife.

When repairing process pipelines, worn areas are replaced with new ones, defective welded joints are removed, and coils are welded in their place. Before removing a section of pipeline, it is necessary to secure the separated sections so as to prevent their displacement. The area to be removed is secured 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.

The collector assembly consists of connecting individual sections, blocks (lashes), parts and attaching it to supports and hangers. Before assembly, individual components are located in the workshop between devices, pumps, and fittings. First, the assembly is done “in rough form”, i.e. the parts to be welded are tacked together, flange connections are assembled using mounting bolts. After such assembly and alignment of the horizontal and vertical sections, final welding of the joints is carried out, and in flange connections mounting bolts are replaced with studs or permanent bolts with their final tightening. After this, the pipeline is fixed on supports.

Lifting and laying of pipeline components and parts 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 prevented.

On vertical devices, replaceable components and parts of pipelines are secured with slings in two places for hanging them.

When connecting to other nodes, re-slinging is excluded. The raised assembly or part is adjusted to the connecting flange using a mandrel, and then the gasket is installed and all the studs and bolts are secured. After carrying out these operations, the slings are removed. If a new pipeline unit is connected by welding, then the slings are removed after welding its first seam.

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

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

Figure - Checking the perpendicularity of the flange sealing surface

to the pipe axis

When repairing inter-shop pipelines, 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 workshop. In conditions of overpasses, saturated big amount pipelines, repairs become more difficult. In this case, replacing worn areas or laying additional lines is possible only with separate pipes of short length. The pipes are lifted by a crane or winch and brought into place through the top or side of the trestle. The assembly is carried out in the direction opposite to the slope of the pipeline. When laying pipelines on overpasses, in channels or trays, final fastening begins with fixed supports.

When replacing sections of pipelines operating at high temperature, and also when laying additional lines, expansion of thermal expansion compensators is carried out.

Stretching of compensators is carried out using special devices, with which the compensator is mounted. After securing the ends of the pipeline to fixed supports, the device is removed.

Figure - Screw device for stretching expansion joints

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

Lens compensators are installed on pipelines that have longitudinal and transverse movements. To prevent lens rupture when the pipeline shifts in the transverse direction, ties are placed on the expansion joints. Lens compensators are stretched to half their compensating capacity.

Figure - Lens compensators with ties

1 – traction; 2 – paw.

When repairing pipelines laid in the ground, the following main work is performed:

1) opening of backfilled trenches; disconnection of pipeline sections;

2) raising these areas to the surface;

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

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

5) applying new insulation;

6) laying the pipeline in a trench.

If there are minor damages (cracks, holes, sweating, etc.), the pipeline does not stop working. For non-toxic products, repairs are carried out by welding on patches. Joint ruptures 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.

Pipelines with a diameter of up to 300 mm, laid at a depth of no more than 1.2 m, are repaired by lifting and laying them above the trench on planks. With a diameter of more than 300 mm, repairs are carried out directly in the trench with the pipelines being lifted to a height of 60 - 70 cm from the bottom of the trench and laid on beds.

The main type of repair of underground pipelines is the replacement of a worn-out section with a new one. With this method, the pipeline removed 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 a trench, the most stressed welded joints are reinforced with couplings or strips. For a better fit of the slats to the pipeline, a bend is made in the middle of the slats. When reinforced with couplings, their length is taken 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 permissible gap between the coupling and the pipe is 2 mm.

During repairs, sometimes it is necessary to connect to the existing pipelines of neighboring workshops. This need also arises when connecting a new device to existing workshop pipelines. Such insertions are most often carried out during shutdown repairs. Insertion into an existing pipeline is carried out using a special device. A pipe with a flange is fitted and welded to the pipeline at the insertion point. A valve of the required series is attached to this flange on studs. A device consisting of a drill and a crown is attached to the valve on the flange, on which cutters, a rod, an oil seal, a ground bushing, a thrust ball bearing and a steering wheel are mounted. By rotating the crown using a steering wheel, a hole of the required diameter is cut out in the wall of the main pipeline. After this, the rod with the crown rises above the valve clinker 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 inserting a branch into an existing pipeline

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

7 – rod; 8 – valve; 10 – oil seal; 11 – ground book;

12 – thrust ball bearing; 13 – steering wheel.

After the completion of major repairs of pipelines, the quality of work is checked, flushing or purging, and then testing for strength and density. The technological equipment is turned off before testing, and the ends of the pipeline are closed with plugs. All inserts for control and measuring instruments are plugged. At the lowest points, fittings with fittings are welded to drain water during hydraulic testing, and at the highest points, air vents are welded in to release air. Pressure gauges with a measurement accuracy class of at least 1.5 are installed at the starting and ending points of the pipeline.

Hydraulic testing for strength and density is usually carried out before covering with thermal and anti-corrosion insulation. 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 test pressure is maintained for 5 minutes. After this, it decreases to the operating value. The pipeline is carefully inspected. Weld seams are tapped with a light hammer. After the test, the air vents are opened and the pipeline is completely freed of water.

Pneumatic testing is carried out with air or inert gas. In this case, 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 overpasses, in channels, i.e. where existing pipelines are located. Gas pipelines operating at pressures up to 0.1 MPa are tested at the pressure established by the project.

Price is negotiable

Good afternoon, we need to fix a leak in a pipe (repair of the hot water supply line). We need to find out how much it will cost to replace the entire line and how much it will cost to repair that piece of cat pipe. gave a leak. I would like to invite your specialist to come to us to clarify the scope of work. And then by e-mail we want to receive from you 2 commercial offers in the form of ESTIMATES!!! with the cost of work - repairing the entire route - that is, replacing the pipes completely in that section and repairing the route of the section where the leak is occurring. clarifications on volumes: (our information) A) If you replace the entire DHW route (return and direct) !!! 1) dismantling of asphalt concrete coatings and bases - 70-80 m2 2) dismantling of soil - 70-120 m3 3) dismantling/installation of pipeline st. 57*3.5/125-1-PPU PE - 106 m.p. 4) dismantling/installation of the outlet - 4 pcs. 5) landscaping. Indicate prices including VAT 18% and the cost of materials. B) If you change a piece of pipe, replace the 12 m.p. pipeline. Indicate prices including VAT 18% and the cost of materials.

  • Created

When:, 19:10

Address: Nizhnyaya Pervomaiskaya street, 18A

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The pipeline, regardless of its purpose and specific use, requires periodic maintenance and repair. In this case, the peculiarities of its operation, the characteristics of operating conditions and the parameters of the working environment are always taken into account. Timely repair and replacement of underground pipelines allows us to minimize the likelihood of an emergency situation, disruptions in the operation of heating systems and water supply.

In fact, there are few options for breakdowns that can lead to system malfunction. The first step is to prevent leaks as much as possible. They can occur both at junctions and at mechanical damage pipe bodies. Replacing water supply pipelines or fittings used to connect in this case will become the simplest, fastest and at the same time inexpensive method recovery.

External systems that are laid underground require special attention. Pipeline repair using the stocking method is one of the main modern techniques, which allows you to restore work current system so as to avoid the need to open the trench.

The main signs that require refurbishment of pipeline systems are:

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

Pipeline repair using the stocking method allows not only to eliminate problems that have arisen, but also to high efficiency carry out diagnostics of the current system.

This way it can be done:

  • cleaning inner surface from deposits formed during operation;
  • inspection of the system condition;
  • restoration using sleeve (stocking) covering.

As a result of the use of stocking technology, repairs and replacements of heating pipelines are carried out with maximum efficiency and cost-effectiveness.

Heating main repair

Despite the apparent simplicity of the design engineering systems, repairing heating networks almost always becomes quite a complex task, requiring the involvement of specialized specialists. One of the most effective methods prevention emergency situations becomes the timely implementation of repair and restoration work and regular preventive maintenance. With this approach, as practice shows, complete replacement of heating systems will be required much less frequently, due to the increase in service life several times.

The specifics of repairing 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”) path, the technology for performing work, as a rule, is significantly 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 most relevant method is trenchless repair and restoration. In its use major renovation heating networks will be carried out as efficiently as possible, even taking into account the difficulties of performing any such work in 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

Timely prevention and high-quality troubleshooting of the water supply system - effective method increasing the overall reliability of the entire system. At the same time, repairs to external water supply systems are usually carried out by the operating organization or those specializing in this area of ​​work. contractors. Increasingly, they can be completed without dug trenches, damaged road surfaces, or violations of the design of the adjacent territory.

Carrying out urgent repairs 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, emergency repairs of the water supply system will be associated with a break in the water supply, the need to carry out more complex restoration work and eliminate flooding caused by the leak.

Pipeline repair cost

There are several determining factors that influence final cost replacement of pipelines and their reconstruction.

  1. Purpose of the pipeline system (sewage, water, heat supply).
  2. Type of system (collector, main, internal pipeline).
  3. Material for making pipes (the complexity of welding, cutting, and connections depends on it).
  4. The degree of contamination of the network (the estimate for repairing a heating main or water supply may include additional cleaning of the system).
  5. Pipeline laying depths, terrain features (prices for repairs of heating mains and water supply networks increase significantly when work is carried out on rocky areas or sandy soils).
  6. Difficulty of the route (availability large quantity turns, building density).
  7. Seasonal factor.

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

As is known, timely service and can save you from unexpected cash expenses, which in the industrial sector can take on colossal proportions. Our company’s specialists have many years of experience in the relevant industry, and also regularly undergo certification, thanks to which we guarantee our customers exclusively high quality services provided.

Our company’s specialists are ready to perform:

Major repairs and replacement of heating (water supply) system pipelines

Current repairs of heating (water supply) system pipelines

Urgent emergency repair of heating (water supply) system pipelines

Repair of insulation of heating (water supply) system pipelines.

Having in your arsenal the most modern equipment and materials we provide a range of services:


Repair of central heating (water supply) pipes

repair of heating (water supply) system pipelines

Repair and maintenance of heating (water supply) networks

Cleaning and flushing of pipelines heating (water supply) networks

Pressure testing of heating (water supply) systems.

Professional pipeline repair

The bulk utility networks made of steel pipes, which have a fairly long service life, but with all their advantages they are susceptible to metal corrosion, which quite often leads to emergency situations. In such cases, urgent emergency repairs of pipelines (heating, water supply) are necessary. When steel pipes break, pipelines are repaired by welding. Depending on the nature of the damage, in some cases, pipelines are repaired and replaced in damaged areas. When pipelines are located in a closed location, it becomes necessary additional work, carry out partial dismantling of the wall, floor or trench section to provide access to the damage. The price for work in such a situation will be higher than in the case of an open pipeline. Masters carry out qualified maintenance and repair of heating and water supply systems. This means that it is possible to quickly and inexpensively repair steel (polypropylene) heating pipes, repair heating radiators, repair heating system fittings, and repair heating risers.

We guarantee:

  • efficiency;
  • selection of optimal solutions;
  • high quality results;
  • optimal prices;
  • work schedule convenient for you.

Experts use best materials and equipment in the process of implementing tasks. Choose a reliable service company - contact us. The result of the LLC's work GLOBAL-ENGINEERING always the same – high equipment performance and uninterrupted service throughout the entire operational life.

For a service request

See also:

☑ Consultation with specialists technical issues

☑ Emergency and urgent work

☑ Reduced tariffs for connecting objects to communications

☑ Free departure specialist

☑ Quick calculation optimal price

☑ Execution of work in as soon as possible

☑ Non-standard solutions complex technical problems

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The construction of any communications involves a whole complex of various nuances and features. And if you lose sight of something, you can end up with a system that is not very reliable or even safe, for example, poor-quality plumbing. To prevent this from happening, you need to trust similar works only experienced specialists: engineers, designers and workers. Our SU-18 Group of Companies is ready to help you with this. This also applies to such types of work as water supply repair And water pipe repair.

It is better to contact specialists once who will professionally perform repair of water supply system at an enterprise than trying to save money and exposing yourself to various troubles: accidents, leaks, etc. Our specialists will do everything conscientiously and responsibly necessary work, including repair of external water supply urgently.

A well-done job by our specialists will save you from further investments in maintenance and functioning of the water supply system. All you have to do is take care of standard preventative maintenance. The team of professionals of the SU-18 Group of Companies will take into account every little detail and will carry out high-quality repairs of the water supply system in Moscow.

We will select for you pipes that match all the quality modern requirements. Let's calculate required diameter and characteristics for each area to be repaired. We will take into account all communication systems so that the water supply structure does not overheat and works efficiently for many years.

We will provide you with the ability to completely turn off the water supply, which may be necessary in emergency situations or, for example, in the future for refurbishment or water supply maintenance. Our masters are well versed in all the nuances repair work, and know how to make your plumbing reliable and leak-proof.