RU109824U1 - PIPELINE REPAIR DEVICE - Google Patents

Abstract

 A device for repairing a pipeline containing a fitting, on one pipe of which a cutting machine is installed, and the second pipe of the fitting is used to connect the bypass line, the cutting machine is made with two cutting elements arranged in parallel, two plugs are placed inside the fitting, one of which is installed with the possibility of overlapping the first fitting pipe, and the second plug is made with sealing surfaces on both sides and installed with the possibility of overlapping the second fitting pipe or overlapping Ia repaired pipeline section, characterized in that the bypass line is made of a flexible metal pipe being installed and fastened between pits on rails fixed to the ground potential area in the bends.

Description

The utility model relates to pipeline transport and can be used in the oil and gas industry for pipeline repair without removing the transported medium from it and stopping pumping.

There is a well-known regulatory document (RD51-00158623-09-95 “Technology for the production of work on gas pipelines with pressure insert, including hot work” (VNIIGAZ, Moscow), which describes the recommended organization of work on repairing a gas pipeline section with a bypass line device.

The disadvantages of the known works are their high complexity, the presence of a large number of tees welded into the pipeline, the presence of at least two sizes of machines for cutting holes in the pipeline, a large number of shutoff valves, low reliability of the valves.

Also known is a device for blocking pipelines under pressure (Auth. Certificate. No. 842325, 1981) comprising a sealed housing, a locking member and a cutting element made in the form of a cutter with a side cutting surface.

A disadvantage of the known device is the low reliability of the locking element.

A device for repairing a pipeline is also known, which comprises a fitting, a cutting machine is installed on one pipe of the pipe, and a second fitting pipe is used to connect the bypass line, the cutting machine is made with two cutting elements arranged in parallel, and two plugs are placed inside the fitting, one of which is installed with the possibility of overlapping the first fitting pipe, and the second plug is made with sealing surfaces on both sides and is installed with the possibility of overlapping the second patrol bq fitting or overlap of the repaired section of the pipeline (patent RU No. 2275544, 2006), taken as a prototype.

The most dangerous, time-consuming and lengthy type of work during the repair of the pipeline according to the prototype will be the installation of a bypass line due to:

1. The need for vehicles of large dimensions and carrying capacity for the delivery of pipes, bends, flanges to the scene of the accident and back to the base;

2. The need for such labor-consuming and expensive operations as:

- measurement and marking of pipes for the installation of a bypass line taking into account the extent of damage, the terrain and the depth of the repaired pipeline;

- continued use of lifting equipment in the assembly of the bypass line;

- the long duration of repair work associated with the need for fitting during welding due to the terrain and the depth of the repaired pipeline;

- the need for testing the strength and tightness of the mounted bypass line per pumping aggressive and explosive atmospheres, which are oil and gas;

- long duration of dismantling the installed bypass line;

- the need for time-consuming, expensive work to bring the dismantled elements of the bypass line (pipes, bends, flanges) in a state that allows their subsequent use;

3. The need for hot work in the gassed area.

The objective of the utility model is to reduce the duration and cost while improving the safety of pipeline repair work.

The problem is solved by a pipeline repair device containing a fitting, a cutting machine is installed on one nozzle of the pipe, and the second fitting pipe is used to connect the bypass line, the cutting machine is made with two cutting elements placed in parallel, two plugs are placed inside the fitting, one of which is installed with the possibility of overlap of the first fitting pipe, and the second plug is made with sealing surfaces on both its sides and installed with the possibility of overlapping the second pipe fi branding or overlapping portion of the conduit to be repaired, characterized in that a bypass line is formed of a flexible metal tube (HMT) being installed and fastened in the pit between pits on rails fixed to the ground potential area in the bends.

Since the HMT is connected to the pipe in pits (which can have steep slopes) on two sides of the damage site, laid along a complex relief, bends are possible, unacceptable bends (with a radius of less than 5 diameters of the HMT), all this can lead to a decrease in strength, as well as the integrity of the gas turbine and the unreliability of repairs in general.

In order to prevent the above, the gas turbine is equipped with guides in the form, for example, of bends with a remote part along the longitudinal plane and equipped with fixing clamps, which can be made in the form of a bonding material, for example, wire. The GMT is laid on guides, the guides are installed and fastened in places of sharp turns and on the edges of the foundation pit, the GMT is attached to the lodgements with a cohesive material, which prevents unacceptable bends and bends of the GMT.

A device for repairing a pipeline consists of a fitting 1 with a first 2 and a second 3 nozzles. A cutting machine 4 is installed on the first pipe 2 of fitting 1, having two parallel cutting elements 5. The second pipe 3 of fitting 1 is used to attach a bypass line made of a flexible metal pipe and laid in places of unacceptable bends on the guides. Inside the fitting 1, two plugs 6 and 7 are placed, and the plug 6 is installed with the possibility of overlapping the first nozzle 2 of the fitting 1. The second plug 7 is made with sealing surfaces on both sides and installed with the possibility of overlapping the second nozzle 3 of the fitting 1 or overlapping the repaired pipeline section. The retention of the pipe segment between the cutting elements 5 is carried out by spring-loaded elements 8, see figure 1.

Repair of the pipeline using the device is as follows.

First, fittings 1 are mounted on both sides of the repaired section of the pipeline. Attached to the second nozzles 3 of the fittings 1 is a bypass line 9 made of gas turbine. Moreover, the gas turbine is laid on the guides 10, attached to them. The guides themselves are also fixed to the terrain in order to prevent their shift and unacceptable bends and bends of the GMT, see figure 2.

HMT is pressed at the base (in the factory) and checked on site for leaks. Cutting machines 4 are installed on the first nozzles 2 of the fittings 1. After installing the cutting machine 4, it is turned on and the cutting elements 5 make two cuts in the pipeline. Next, the cutting elements 5 together with the pipe segment, which is held between the cutting elements by the spring-loaded elements 8, are lifted into the machine body and, turning the plug 6, block the first pipe 2 of the fitting 1, remove the transported medium from the machine body, dismantle the machine 4 and into the first pipe 2 weld the plug. In the bypass line and the pipeline, the pressure is equalized and then the second plugs 7 are turned simultaneously in both fittings, while the transported medium is sent to the bypass line, and the repaired section of the pipeline is blocked on both sides. Having removed the transported medium from the pipeline being repaired, it is cut off, a new pipe is installed, it is welded, the pressure in the pipeline and in the newly welded section are equalized. Then at the same time turn the plugs 7 in both fittings 1, while the transported medium is sent through the repaired area, and the pipes 3 of the fittings 1 are closed.

The transported medium is removed from the bypass line, the bypass line is dismantled, rolled into a bay or onto a drum. Plugs are welded into the second nozzles 3 of the fittings 1. The gas turbine is inspected, delivered to the base, where it is pressed and stored until the next repair. A flexible metal pipe can be manufactured according to (patent RU No. 37404, 2004. and patent No. 81782, 2008).

The pipeline repair can be carried out using both two cutting machines, and when using one cutting machine.

Thus, the use of a flexible metal pipe for the installation of a bypass line will eliminate all the disadvantages inherent in the prototype and the above.

Claims (1)

A device for repairing a pipeline containing a fitting, on one nozzle of which a cutting machine is installed, and the second fitting nozzle is used to connect the bypass line, the cutting machine is made with two cutting elements arranged in parallel, two plugs are placed inside the fitting, one of which is installed with the possibility of overlapping the first fitting pipe, and the second plug is made with sealing surfaces on both sides and installed with the possibility of overlapping the second fitting pipe or overlapping Ia repaired pipeline section, characterized in that the bypass line is made of a flexible metal pipe being installed and fastened between pits on rails fixed to the ground potential area in the bends.