RU180820U1 - ELASTIC SEALER FOR OIL PIPELINE - Google Patents

Abstract

The utility model relates to means for blocking oil vapor and oil products from pipes by introducing an element expanding in place into the pipe and can be used in the repair of pipelines for various purposes, including main oil pipelines. An elastic sealant for an oil pipeline contains a cylindrical flexible shell, a pressure and vacuum control unit. The elastic sealant also includes a pressure and pressure control line consisting of a pressure injection tube and a pulse tube. In this case, the cylindrical flexible shell consists of external and internal chambers. The pressure and vacuum control unit includes a manometer, a manovacuum meter, a pressure gauge configured to pump liquid into the impulse tube, and stop valves for pumping pressure into the cylindrical flexible shell and to pump liquid into the impulse tube. Part of the impulse tube passes inside a cylindrical flexible shell. The technical result of the utility model is to provide pressure and vacuum control at the site of repair work. 3 ill.

Description

The utility model relates to means for blocking the internal cavity of pipelines from oil vapor or oil product by introducing an element expanding in place into the pipe and can be used in the repair of pipelines for various purposes, including main oil pipelines.

When carrying out emergency recovery work on pipelines, it is necessary to free the repair area from oil or oil product, followed by cutting out the defective coil (depressurization of the pipeline). For safe welding and installation work, the ends of the pipeline are sealed against oil vapor or oil product using sealing devices, in particular pneumatic sealants, having an elastic cylindrical closed shell.

A device for reusable sealing of the internal cavity of the open end of the pipeline (patent RU No. 137080, publ. 01/27/2014, IPC F16L 55/10), containing one shut-off device installed in the pipeline from each open end thereof. One of the locking devices is a closed shell of cylindrical shape with flat bottoms and consists of a sealing chamber, rubber-cord frame and an external protective layer. To connect it to a source of compressed air (inert gas), seal and bring into operation, a compressor and a remote valve with a valve fitting and pressure gauge are used.

Also known is a device for tight shutoff of the internal cavity of the pipeline (patent RU No. 54649, publ. 10.07.2006, IPC F16L 55/12). The device comprises an elastic shell, which has a cylindrical surface with end walls and an opening on the cylindrical surface, hermetically connected to one end of the hose for supplying an expanding shell of the medium.

A device is known for tightly shutting off the internal cavity of a pipeline (patent RU No. 119841, publ. 08.27.2012, IPC F16L 55/12) containing an elastic cylindrical closed shell. An opening is provided on the end wall of the shell, provided with a medium supply unit expanding the shell.

When using the above devices, it is mandatory to monitor the overpressure of gases or vacuum in the pipeline using a manovacuum meter, for which at a distance of not less than 40 m from the place of work, control holes are drilled with a diameter of 12 mm with the requirements to ensure minimum distances from longitudinal and transverse welds the pipeline and with the further elimination of the technological hole using chop. This complicates the technology of sealing the pipeline during repairs and requires additional time and makes it difficult to control the pressure and / or vacuum in the working area of the pipeline.

In production, there is a need to seal the internal cavity of pipelines during emergency recovery operations with cutting insets of coils, including in cramped conditions, the pressure / vacuum control unit must be moved outside the work sites using flexible hoses.

The technical problem of the proposed technical solution is to improve the technology of sealing the pipeline during repair work.

The technical result of the utility model is to provide pressure and vacuum control at the site of repair work.

The technical result is achieved by the fact that an elastic sealant for an oil pipeline containing a cylindrical flexible shell, a pressure and vacuum control unit, further comprises a pressure and pressure control line, consisting of a pressure injection tube and a pulse tube, while the cylindrical flexible shell consists of an external and an internal chamber and the pressure and vacuum control unit includes a manometer, a manovacuum meter, a pressure gauge made with the possibility of pumping liquid into the impulse tube, and a stop valve round for pumping pressure into the cylindrical flexible shell and for pumping fluid into the impulse tube, and part of the impulse tube passes inside the cylindrical flexible shell.

The claimed utility model is illustrated by the following drawings:

in FIG. 1 shows a general view of an elastic sealant in a working area of a pipeline;

in FIG. 2 shows a view of an elastic sealant with a pressure and pressure control line;

in FIG. 3 shows a view of a pressure monitoring unit with a pressure and pressure control line.

In FIG. 1-3 the following items are indicated:

1 - pipeline (oil pipeline);

2 - cylindrical flexible shell (sealing element);

3 - external camera;

4 - inner chamber;

5 - a sealing ring;

6 - tube pressure injection into the shell;

7 - impulse tube;

8 - pressure gauge;

9 - shutoff valves for forcing pressure into the shell;

10 - manovacuum meter;

11 - pressure gauge;

12 - shutoff valves for pumping fluid into the impulse tube;

13 - housing unit control pressure and vacuum (UKD);

14 - pressure and vacuum sensor;

15 - connection node.

An elastic pneumatic sealant for pipeline 1 (oil pipeline) includes a cylindrical flexible shell (sealing element) 2, consisting of an external 3 dense high-strength chamber that is resistant to oil, oil products and minor mechanical damage, as well as an inner 4 chamber that holds the internal working pressure of the gas environment . The shell 2 is resistant to repeated bending, is able to deform, and is equipped with transverse sealing rings 5 of elastic and oil-resistant material, ensuring tightness between the inner wall of the pipeline 1 and the shell 2. Depending on the diameter of the blocked pipeline 1 and the requirements for the medium to be kept, the sealing rings 5 on the shell 2 may be one or more. The elastic sealant also contains a pressure injection and pressure control line, consisting of a pressure injection tube 6 into the shell 2 and a pulse tube 7, a pressure and vacuum control unit (UCD), which includes a manometer 8 for monitoring the pressure of the working medium in the shell 2, shutoff valves 9 for pressure injection into the shell 2, a manovacuum meter 10 for monitoring pressure or vacuum in the working area of the pipeline 1, a pressure gauge 11 for discharging air from the impulse tube 7, shutoff valves 12 for pumping liquid into the impulse tube 7. anometr 8 meteers 10 manometric valve 11, valves 9 and 12 are disposed on the housing 13 SACs. The impulse tube 7 is designed to transmit pressure or vacuum values from the pressure and vacuum gauge 14 to the manovacuum meter 10. Tubes 6 and 7 of the discharge and pressure control lines through intrinsically safe fittings (not shown in the drawings) are removed from the internal cavity of the pipeline 1 through nozzles or a technological hole ( up to 40 mm) and are connected to the corresponding measuring devices of the UKD, and through the connection unit 15 located on the surface of the shell 2, they are brought into the internal cavity of the shell 2. In this case, part of the pulse ki 7 extends inside (through) a cylindrical flexible sheath 2 from the connection node 15 to the sensor 14 the pressure and vacuum. The pressure sensor 14 and the connection node 15 are located on opposite ends of the cylindrical flexible shell.

The transmission of values or messages about pressure or vacuum to the pressure and vacuum control unit is carried out using a pulse tube 7 connected to a pressure or vacuum control sensor 14 of the working area of the pipeline 1 and a manovacuum meter 10 on the UCD.

The pressure or vacuum control sensor 14 can be of a deformation (elastic) type, for example, the operation of which is based on the elastic deformation of the membrane (diaphragm).

As a manometer 8 and a manovacuum meter 10, working manometers based on the principle of spring action, explosion-proof execution are used.

The pressure and vacuum sensor 14, the connection node 15 are fixed from the inner 4 and outer 3 chambers using flanges or washers of intrinsically safe material or their fixation can be provided by polymer casting to ensure the tightness of the shell 2.

The principle of operation of an elastic sealant for an oil pipeline (pipeline) is given below.

Before installing an elastic sealant, the internal cavity of the pipeline 1 is cleaned of paraffin deposits and dirt. Technological openings are being prepared for the output of tubes 6 and 7 of the discharge and pressure control and DHW control lines in the cut-off section of pipeline 1. The sealant is installed in the internal cavity of pipeline 1 without internal pressure in the working area. The installation of a cylindrical flexible shell 2 of the sealant in the internal cavity of the pipeline 1 is carried out from the open end of the main pipeline 1, after freeing from oil or oil products and cutting a section of the pipeline 1 (coil).

The preparation of technological holes to control pressure or vacuum in the working area of the pipeline 1 at a distance of 40 meters is required for duplication. Tubes 6 and 7 of the injection and pressure control lines are connected to the pressure and vacuum control unit, injection of the working area of the pipeline 1. Next, a control check of the pressure retention by the sealant is carried out. During the execution of work, the pressure readings of the working environment of the sealant and the values of pressure or vacuum in the working area of the pipeline 1 on the control are monitored. After emergency operations, the pressure is removed from the outside of the pipeline 1 and the pressure and vacuum control unit is dismantled. Next, the technological holes are brewed using the chop installation method.

The use of the proposed elastic sealant allows for monitoring the state of oil or oil product vapor in the working area of the pipeline, as well as providing pressure or vacuum control directly from the place of work, without the need for a pressure and vacuum sensor in the cramped conditions to ensure the required distances to welded joints pipeline, and the preparation of additional technological holes in the pipeline.

Claims (1)

An elastic sealant for an oil pipeline containing a cylindrical flexible shell, a pressure and vacuum control unit, characterized in that it comprises a pressure and pressure control line consisting of a pressure injection tube and a pulse tube, while the cylindrical flexible shell consists of an external and internal chambers, and the assembly control of pressure and vacuum includes a manometer, a manovacuum meter, a pressure gauge made with the possibility of pumping fluid into the impulse tube, and shut-off valves for pumping pressure into the cylinder flexible casing and for pumping fluid into the impulse tube, and part of the impulse tube passes inside the cylindrical flexible shell.

Images