RU20360U1 - DEVICE FOR PROTECTING THE INTERNAL WELDED SEAM OF PIPELINES - Google Patents

Description

Protection device

The proposed solution is intended for the protection of the weld zone of pipes with an internal coating and can be used in the assembly of pipelines intended for the transportation of corrosive media in the oil, gas, chemical and other industries.

A welded connection of pipes with an internal enamel coating is known, containing two pipes to be connected, to the ends of which corrosion-resistant bushings are welded. An enamel layer is applied to the inner surface of the pipes and corrosion-resistant bushings are welded together (A.S. No. 1648696, B23K 31/00, Bl.No. 18-91).

The disadvantages of the known solutions are:

-the difficulty of performing the connection;

-the need to use expensive bushings made of scarce materials;

- the inability to assemble pipes in the field.

Also known is a welded joint of pipes with an internal enamel coating, containing two pipes with sockets at the ends, in which cylindrical inserts are placed to form a cavity between the ends of the pipes and the outer surface of the cylindrical inserts, which is filled with corrosion-resistant material (AS No. 132 8121, B 23 K 31/06, Bl No. 29-87).

IPC F16L 13 / 02,13 / 00 23K 31/00, 31/02 of the internal weld of pipelines.

The disadvantages of the known solutions are:

the complexity of the connection;

the need for expensive bushings from

scarce materials;

the inability to assemble pipes in the field.

The THRU-KOTE UB coupling of the TURBOSCOPE VETKO Federal Republic of Germany is known, which is structurally composed of a housing, an internal heat-resistant phenolic-epoxy-powder coating, which is additionally sealed1;

In the cocktail sections of the sleeve grooves are made in which sealing rubber rings are installed, which are designed to provide sealing in the gap between the sleeve and the pipe according to the inner diameter. On the body of the sleeve there are metal protrusions that are welded into the root weld: the seam, ensuring pipe alignment and the installation of the necessary clearance for welding. To install the bushings, a two-component epoxy mastic is applied which is applied at both ends before installing the bush and secures 1 ® eaa: additional sealing, which is protected by the hood.

This solution provides reliable protection of the welded pipe joint area, however, it has the following disadvantages:

- to the connected tube d are tight tolerances. crushed walls to the outer diameter of that. -Tr ebueg application of precise rental;

-On the outer surface of the sleeve, ring grooves and ring grooves are filled. it complicates the manufacturing technology of the sleeve;

- at the ends of the sleeve, lead-in cones are made;

-the presence of an annular groove and annular grooves requires the mandatory use of thick-walled blanks for the manufacture of bushings.

The closest in technical essence and the achieved result when using is the connection of enameled pipes containing a sleeve with an internal enamel coating, in the center of the outer surface of which is made annular

a groove and persistent protrusions radially located in its middle section, protruding above the surface of the sleeve when it is fixed in the joint zone of the pipe connection. At the ends of the outer surface of the sleeve annular grooves are fitted into which the sealing elements and entry cones are installed. To ensure additional sealing of the welded joint area of the pipes, adhesive material is applied to the inner surface of each end of the pipes to be connected., Which is placed between the inlet cones and the inner surface of the pipes, while installing the pipe sleeve 1, and the outer surfaces of the groove of the sleeve are coated with heat-insulating material (IPC F14L 1S / 02 Pat. No. 2080510 Bl. M15-97, Prototype).

This solution provides quick and reliable connection of pipes, but it has the following disadvantages:

-On the outer surface of the sleeve is an annular undercut and annular grooves;

- at the ends of the sleeve aakhodny cones are performed which complicates the technology of manufacturing the bushings;

- the presence of an annular groove and annular lasers requires the mandatory use of thick-walled blanks for the manufacture of bushings, which is associated with significant material and labor costs, and as a result, with a high tempering tsetse.

The proposed solution is deprived of all its shortcomings and allows:

-to simplify the device;

-provide reliable protection of the zone of welded joints of pipes with an internal protective coating;

-decrease material and labor costs.

The technical result is achieved by the fact that in the device dll. protect the inner seam. A pipe containing a high-pressure pipe, bearing mounting tabs and sealing elements, the sleeve has sockets at its ends and elastic-elastic jackets located on the outer surface adjacent to the ring stops installed at the boundary between the transition and the socket. The execution of the sleeve with sockets allows you to protect the roller from the adhesive material (not shown in the drawing).

Formed between the cuff and the bell when mounting the sleeve in the pipe. In addition, the socket acts as a cut-off and redistribution of the flow of the transported medium, while reducing the pressure on the elastic-elastic cuffs and is an additional condition for reliable protection of the welded joint zone.

The location at the ends of the sleeve is of elastomeric cuffs adjacent to the thimble stops in the zone of transition of the cylinder to the socket allows optimally forming a protective roller of adhesive material, providing reliable protection of the welded joint zone., And, their location directly on the outer surface of the sleeve simplify the manufacturing technology devices and reduce material and labor costs.,

On the attached € m-h € the same image shows a device in a section

The device consists of a sleeve. 1 with sockets at its ends. In the middle section of the sleeve for installation in the pipe there are radial protrusions 2, which are welded into the root weld, making pipe alignment and installation of the necessary clearance for: welding, ring stops. prgeguyushchy to shsh: elastic-elastic cuffs 4.

The assembly of the connection is carried out as follows:

Adhesive material is applied to the inner surface of each end of the connected pipes and the device is inserted into one of the pipes until the radial projections 2 abut against the end of the pipe, then the other pipe is joined with the pipe in which the devices are installed and welding is performed.

The proposed device is made of thin lithium material (thickness mm.), In the form of an experimental batch: and undergoes pilot tests of structural steel with an internal heat-resistant coating and corrosion-resistant steel. without internal heat-resistant coating.

Av tork Yu.A. Gordeev.

,

Mr Miroptnik O.K. Parkhomenko

Claims (1)

A device for protecting an internal weld of a pipeline, comprising a sleeve carrying mounting tabs and sealing elements, characterized in that the sleeve has sockets and elastic-elastic cuffs located on the outer surface adjacent to the annular stops mounted on the boundary of the transition of the cylinder sleeves in a bell.