RU2343330C1 - Method of repair of active pipelines damages without their shutdown - Google Patents

Abstract

FIELD: construction, pipeline.

SUBSTANCE: invention pertains to pipeline transport and is employed in repair of pipelines without the latter been shut down. By-pass line is created skipping defect part of the pipeline. For the repairing period of the defect part of the pipeline it is disconnected from the pipeline by means of flexible diaphragms filled in with air and lapping flow in the pipeline in both directions. Diaphragms are installed into the pipeline by means of tie-in device into the pipeline under pressure, installation of transfer chamber, where through diaphragms and preventer ensuring sealing central hole of the pipeline from the outdoor environment are inserted into the pipeline. Enhanced safety of repairing works.

EFFECT: enhanced reliability of the repairing works.

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Description

The invention relates to a method for repairing pipelines for various purposes.

In various industries, pipelines are widely used for transporting water, oil and oil products, gas, etc.

Known methods for repairing damage to pipelines, in which it is necessary to disconnect and release the disconnected sections from the pumped product. When emptying the pipeline there is a loss of the pumped product, environmental pollution; the pumped water is not collected at all, but discharged from the pipeline. At large distances between the secant valves, large losses occur in the pumped product.

Mustafin F.M., Bykov L.I. and other field pipelines and equipment. - Moscow, 2004.

Known RD51 - 001158623-09-95 "Technology of work on gas pipelines with inset pressure, including hot work" VNIIGAZ, Moscow, 1994. Repair of pipelines in accordance with the specified guidance document is made with the bypass line and the use of expensive equipment manufactured abroad, the complexity of the repair is high.

This repair method is adopted as a prototype.

Solved technical problem of repairing pipelines without shutting them down is as follows:

- reduction of repair time;

- reduction of product losses;

- reduction of equipment downtime;

- reduction of lost profits of the consumer of the product;

- reduction of negative environmental impact;

- ensuring the operation of the pipeline during repair.

The use of relatively inexpensive equipment manufactured by the domestic industry (valves, devices for tapping into a pipeline under pressure).

The solution to the problem is achieved:

- the device of the bypass pipeline of the defective section;

- inserts into the existing pipe of the pipe with a valve for attaching a transition chamber;

- the introduction into the existing pipeline through the transition chamber of two sealing diaphragms to separate the cavity of the pipeline at the site of damage;

- application for repair work of existing equipment:

a) devices for tapping into a pipeline under pressure (tapping diameter 50-350 mm);

b) preventer.

Figure 1 shows the device of the bypass pipe 8 and the insert pipe 10.

Figure 2 shows the introduction of sealing diaphragms 11 and 12 in the repaired pipeline 9.

Figure 3 shows the filling of the sealing diaphragms 11 and 12 to separate the cavity of the pipe 9 at the site of damage, repair of the damaged area.

Figure 4 shows the completion of the repair of the damaged place of the pipeline 9, the output of the sealing diaphragms 11 and 12 from the pipe.

Consider the sequence of works in the proposed method of repairing damage to existing pipelines without shutting them down (for example, repair of a pipeline with a diameter of 500 mm).

1. At the place of damage to the pipe (figure 1) temporarily to eliminate leaks, a clamp 13 is applied.

2. Welding to the pipeline 9 is carried out from two sides from the place of damage to the nozzles 7, the installation of valves d _y = 350 mm 1 and 2.

3. Installed valves 1 and 2 are interconnected by a pipe 8 d _y = 350 mm (figure 2). The valves open, the product goes through line 9 and line 8.

4. A pipe 10 is welded at an angle of 45 ° to the place of damage on the pipeline (along the product), a valve 3 d _y = 350 mm is installed on the pipe 10, a device 14 is installed on the valve flange 3 for cutting into the existing pipeline under pressure, drilled in the pipeline hole (figure 1).

5. After drilling is completed, the valve 3 is closed, the insertion device 14 is removed and a transition chamber 4 is attached to the valve flange 3, into which two sealing diaphragms 11 and 12 are mounted, fixed at a certain distance from each other on a metal-plastic tube 6 d _y = 20 mm, having sufficient flexibility, with a blanked end and holes for pumping air into the sealing diaphragms. A preventer 5 is fastened to the flange of the transition chamber 4 with the indicated tube 6 from the sealing diaphragms passed through it (Fig. 2).

6. The metal-plastic pipe 6 d _y = 20 mm is clamped in the preventer 5 with a force that ensures sealing of the tube and its movement in the preventer, a valve 3 opens, sealing diaphragms 11 and 12 are introduced into the pipeline being repaired, placing them on both sides of the damage site (Fig. 2).

7. The diaphragms 11 and 12 are filled with compressed air terminated through the tube 6, providing a tight separation of the cavities of the repaired pipeline 9 (Fig.3). The pipeline continues to transport the product through the bypass pipe 8.

8. The cavity of the pipeline 9 is exempted from the product (at the place of the defect between the diaphragms), the defective place of the pipeline is repaired (Fig. 3).

9. Upon completion of the repair, air is discharged from the diaphragms, the diaphragms 11 and 12 are removed into the transition chamber 4, the valve 3 is closed, the transition chamber 4 with the preventer 5 and the diaphragms 11 and 12 are disconnected (Fig. 4).

10. In the pipeline 9, the operating mode is set.

If it is necessary to replace the damaged area with a large length, a bypass line is mounted and the separation diaphragms are installed separately beyond the borders of the cut area.

Claims (1)

A method of repairing damage to existing pipelines without shutting them down, including pipelines with through damage, equipment and tools for repair, characterized in that the repair is carried out on the damaged area, which is turned off at the repair site using flexible sealing diaphragms filled with air to shut off the flow, without stopping work pipeline when transporting the product along the bypass line.

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