The connection of pipes with an internal corrosion-resistant coating

 

The invention relates to the construction and used for the construction and operation of pipelines for corrosion protection of internal surfaces of welded joints of pipes. The pipe contains two tubes with internal enamel and the sleeve mounted coaxially within education in the area of the pipe joint cavity. On the outer surface of the sleeve is made annular groove in the middle section along with the body of the sleeve a radial thrust tabs. On end parts of the sleeve are made of lead-cones and a stepped annular groove in which is installed sealing elements between the outer surfaces of which and the inner surface of pipes placed adhesive material. Sealing elements made in the form of an elastic cuffs G-shaped in cross-section, the peak of which is at an obtuse angle relative to the vertical rack and facing inner surfaces of the pipes, and an end face of the visor - side of the pipe joint to the mounting bead. The space between the outer surface of the sleeve cuffs and the inner surface of pipes filled with adhesive material. Expands the Arsenal of technical means. 1 C.p. f-crystals, 3 ill.

You know the connection of pipes with internal enamel coating containing two connected pipes, the ends of which are welded corrosion-resistant sleeve. On the inner surface of the pipe put a layer of enamel and weld corrosion-resistant sleeve between them, see ed. St. USSR № 1648696, 23 To 31/00, 1991.

The disadvantages of the known solutions is the complexity of the connection, the necessity of using expensive sleeves of scarce materials, the impossibility of assembling pipes under field conditions.

It is also known connection of pipes with internal enamel coating containing two tubes with bells on the ends, which are placed in the insert with the formation of a cavity between the ends and the outer surface of the inserts, which is filled with corrosion-resistant material, see ed. St. USSR № 1328121, 23 To 31/06, 1987.

The disadvantages of this solution are the need belling the ends of the pipes, the complexity of the placement of the inserts inside the pipes, and the impact of welding on the floor through the gap between the inserts. All this failing is more immediate solution to the stated connection is enamelled pipes, containing two tubes with internal enamel coating and a sleeve mounted coaxially within education in the area of the pipe joint cavity on the outer surface of the sleeve is made annular groove, and in the middle section of the last along with flowing sleeves are made radial thrust lugs, end parts of the sleeve is made of an annular groove in which the o elements, and the starting cones, between the outer surfaces of which and the inner surface of pipes placed material with adhesive properties with respect to said surfaces, see RF patent № 2080510, F 16 L 13/02, 1997.

A disadvantage of the known solutions is the unreliability of protection of the weld, because the sealing elements in the form of elastic rings do not provide a reliable seal uncalibrated pipes having deviations of geometrical parameters and sizes (out-of-roundness, raznesennost and so on) from the nominal and allowable defects caused by production method (minor dents, protrusions, etc.,), due to the possible jamming of the sealing elements and disturbances in connection tightness. Install o-rings in these tubes is complicated by the need for reliable welded joint protection and ease of installation connections in the field.

The technical result is achieved by the fact that in the known connection enamelled pipes containing two tubes with internal enamel and the sleeve mounted coaxially within education in the area of the pipe joint cavity on the outer surface of the sleeve is made annular groove in the middle section of which along with the body of the sleeve a radial thrust lugs, end parts of the sleeve is made of an annular groove in which the o elements, and the starting cones, between the outer surfaces of which and the inner surface of pipes placed adhesive material on the end parts of the sleeve is made annular stepped groove, and sealing elements made in the form of an elastic cuffs G-shaped in cross-section, the peak of which is at an obtuse angle relative to the vertical rack and facing the inner surface of the pipe, with the end of the visor facing the pipe joint to the mounting seam, and the space between the outer surface of the sleeve cuffs and the inner surface of pipes filled with adhesive material.

As shown by laboratory tests specified connection in Polipo sleeve is an important element of the Assembly and is determined by the diameter of the connected pipe and climatic features of the Assembly of the connection. So, for small diameters and in summer conditions cuff, mounted on the sleeve side of the visor to the side ends of the cones, allows the sleeve is easy enough using the mandrel to enter the mating pipe. With increasing diameters and masses of the mating sleeve over 219 mm, and also in winter conditions cuff with such orientation of the visor in the groove complicate the assembling of the joint due to possible distortions of the cuff and having sealing end face her visor in the pipe. Changing the position of the cuff with the orientation of the end face of her visor in the area of the pipe joint to the mounting seam makes it easy to install the sleeve into the tube, which is especially important in the field winter time.

To improve the reliability of the connection pipes with a diameter of more than 219 mm on end parts of the sleeve must be installed not less than 2 cuffs, and on the outer surface of the sleeve between the grooves with the cuffs and on its lead-in cones made cumulative annular groove for the sealant. This structural connection will provide reliable protection of the weld uncalibrated pipes, pipes with deviations of geometrical parameters and sizes, as well as provide ease of installation due to the use of “samostanovlenie account sealant error low quality manufacturing of connected pipes. Simplification of Assembly in the field is provided by a given orientation of the end face of the visor cuffs.

The invention is illustrated by drawings, where Fig.1 shows the connection of pipes with corrosion-resistant coating in the context of Fig.2 - section a-a in Fig.1; Fig.3 - node I in Fig.1.

The pipe contains two connected pipes 1 and 2 with an internal corrosion-resistant coating 3, installed inside them, in the joint area, coaxially aligned with the gap of the sleeve 4 with an internal corrosion-resistant coating 5, in the center of the outer surface of which is made annular groove 6 and radially located in the middle section of the axial protrusions 7, protruding above the surface of the sleeve to lock it in the zone of junction of the joined pipes. In the annular groove 6 is placed insulating material 8, such as fiberglass. (Between the internal surface area of the pipe joint and the groove of the sleeve formed by the cavity 9, which is filled with a material 10 with adhesive properties type of adhesive “Ciacil 30”). At the ends of the outer surface of the sleeve 4 is made annular stepped groove 11, in which are mounted the sealing lip 12 and 13, the annular groove 14 between them and the starting cones 15 with annular grooves 16, between which and Olney in the form of an elastic cuffs G-shaped in cross-section, the visor 18 which is at an obtuse angle relative to the vertical posts 19 and facing the internal surface of the pipes 1 and 2, the end face of the visor facing the pipe joint to the mounting seam 20. The second cuff 13 is a duplicate of the first cuff and helps to adjust to any misalignment of the sleeve 4 in the pipe 1 and 2. The space 21 between the outer stepped surface of the sleeve cuffs, the grooves between them and the inner poverhnostyu tubes filled with adhesive material 17. The obtuse angle between the visor 18 and the rack 19 enables the profiling of the visor 18 relative to the inner surface of the joined pipes. The size of this angle depends on the diameter of connected pipes 1 and 2 and selected specifically in each case, for example for pipes 1 and 2 in diameter 219 mm, the angle is 120 degrees.

Assembly of pipe joints as follows: on the inner surface of each end of the joined pipes cause the material 17. The external surfaces of the ends of the cones 15 of the sleeve 4 and the annular stepped groove 11 is filled with material 17 and insert them in the cuff 12 and 13. In one of the pipes 1 insert the assembled sleeve 4, using the auxiliary mandrel (ommerce) for the filling of the visor 18 and cuffs 12 and 13 in the pipe between the mating parts connection then the pipe 2 similarly dock with the pipe 1 and welded each other, forming a weld bead 20, leaving two holes in the locations of the stops to fill the cavity 9 of the adhesive material 10 with the subsequent sealing of the holes.

Claims

1. The connection of pipes with an internal corrosion-resistant coating containing two tubes with internal enamel and the sleeve mounted coaxially within education in the area of the pipe joint cavity on the outer surface of the sleeve is made annular groove in the middle section of which along with the body of the sleeve a radial thrust lugs, end parts of the sleeve is made of an annular groove in which the o elements, and the starting cones, between the outer surfaces of which and the inner surface of pipes placed adhesive material, characterized in that the end parts of the sleeve is made annular stepped groove, and sealing elements made in the form of an elastic cuffs G-shaped in cross-section, the peak of which is at an obtuse angle relative to the vertical rack and facing the inner surface is the surface of the sleeve, the cuffs and the inner surface of the pipe filled with adhesive material.

2. Connection on p. 1, characterized in that on the outer surface of the sleeve between the grooves with the cuffs and on its lead-in cones made of annular grooves.

 

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