CN208058172U - composite conical sleeve - Google Patents

Abstract

A composite tapered sleeve comprises a sleeve sleeved on a pipeline, wherein the sleeve is made of solidified composite materials in a truncated cone shape and is provided with a cylindrical passage along the axial direction, and the diameter of the passage is equal to the outer diameter of the pipeline to be repaired; and having a sidewall with an inner surface corresponding to the outer surface of the sleeve, wherein the sidewall is made of a cured composite material. The utility model provides high maintenance pipeline's performance reliability.

Description

Composite Tapered Sleeve

technical field

The utility model relates to a composite tapered sleeve, especially for repairing defective areas of pipelines and defects of welded joints without interrupting pipeline transportation (water, oil, natural gas and other liquids and gases), and for reinforcing pipelines during pipeline construction stages Welded joints.

Background technique

Repair of pipes using different devices, including devices having a side wall consisting of two interconnected parts and fitted around the area of the pipe defect with a gap between the inner surface of said side wall and the outer surface of the pipe , the gap filling uncured composite material (RU 113811U1, February 27, 2012; RU 129593U1, June 27, 2013; RU 2191317C2, October 20, 2002; RU 2378560C1, January 10, 2010; SK 1995A3, November 6, 1996; GB 2210134A, June 1, 1989). This repair method is called "Composite Sleeve Technology", or CST for short.

CST has various disadvantages, mainly:

1) Due to the possible formation of air bubbles when injecting liquid composite material (especially over defects), there is a risk of uneven filling of the composite material in the space between the pipe and the side wall, which will not provide a guaranteed repair quality, and subsequent Can cause metallic material to be pressed into the resulting cavity, unsealing the pipe.

2) Underwater arc welding of the outer metal sidewall is very complex, thereby limiting the application of the given method in repairing underwater pipelines;

3) Active protection must be provided to prevent soil from corroding the metal side walls;

4) Although having relatively low material and maintenance structural component costs, the organizational and technical measures for their installation are costly, inflating the overall maintenance costs. A polymer sleeve for repairing pipes with localized corrosion defects that does not have these disadvantages consists of several layers of glass ribbons that are interconnected by adhesive layers and cover the pipe circumferentially, wherein the sleeve is composed of two separate The prefabricated halves are made, provided with articulation units which join each other at the ends and are connected by coupling shafts oriented parallel to the pipe axis (RU 2219423C2, December 20, 2003). However, this maintenance structure has other huge disadvantages. Therefore, due to the absence of metal sidewalls, this sleeve cannot repair the repair area to a defect-free level because pre-stretching (heating the fiberglass sleeve and then shrinking it by cooling) is not sufficient to make the fiberglass strong Reach prevents imperfections below the sleeve from advancing into the through hole. The reason for this is that the modulus of elasticity of glass fibers is at least seven times lower than that of steel. In addition, the heating temperature of the bulk fiberglass structure is as high as about 160°C, which is difficult to achieve in the field environment.

According to RU2224169С2 (February 20, 2004) a sleeve for repairing pipes is known, wherein the sleeve comprises a strap made of prefabricated composite material in the form of two half-sleeves with a corrugated profile in the circumferential direction, The elastic pad faces the strap and the smooth contour faces the pipe.

The main disadvantage of this type of sleeve is the use of technical rubber as an elastic pad, which has a service life of 200,000 hours, or about 23 years. Russian standards and norms concerning the construction, development and repair of major pipelines require that materials used for these purposes have a service life of not less than 30 years. Therefore, the structure according to RU2224169С2 (February 20, 2004) cannot be considered as a means of continuous maintenance of the main pipeline.

According to US 2014048164A1 (February 20, 2014), a method for repairing pipelines is provided, wherein one or more compression bands are installed around the outer circumferential surface of the pipeline in the repair area, on the installed compression bands A corrosion-resistant coating is applied to the surface of the pipeline in the maintenance area and a composite cover is wound on the corrosion-resistant (ground) coating applied in the maintenance area.

This repair method cannot uniformly pre-stretch the entire repair structure, nor can it tightly squeeze the defect area of the pipeline, so it cannot ensure that the radial load is evenly transmitted from the defect area to the outer sleeve cover. Huge disadvantage of the structure.

The prototype of the proposed utility model is a sleeve (RU 148064U1, July 14, 2014), which consists of a sleeve mounted on a pipe, said sleeve consisting of two half-sleeves consisting of is made of cured composite material and has a cylindrical inner surface corresponding to the pipe diameter and a conical outer surface, above which is mounted a metal side wall having a conical shape corresponding to the outer surface of the composite sleeve, And consists of two halves pre-joined by arc welding. The composite sleeve resists compression and provides full load transfer from the defect area to the metal sidewall.

Although the solution disclosed in the prototype of the proposed utility model does not have the above two most important CST disadvantages (1 and 4), it still has two disadvantages specific to CST:

Underwater arc welding of the outer metal sidewall is very complex, thereby limiting the application of a given method in the repair of underwater pipelines;

Active protection must be provided to prevent soil from corroding the metal sidewall.

The proposed utility model aims to eliminate the above-mentioned disadvantages.

Utility model content

The technical achievement achieved by the utility model is that the performance reliability of the maintenance pipeline is improved through a composite tapered sleeve, the composite tapered sleeve includes a sleeve sleeved on the pipeline, and the sleeve is composed of a truncated cone made of cured composite material, has a cylindrical channel along the axis, the diameter of which is equal to the outer diameter of the pipe to be repaired; and has side walls, the inner surface of which is in contact with the outer surface of the sleeve Correspondingly, wherein, the side wall is made of cured composite material.

The composite materials making up the sleeves and side walls are chosen from fiberglass, carbon fiber reinforced plastic and basalt plastic.

The sleeve is made of composite material with a compressive strength equal to at least 70MPa, which is in line with the JSC "Transneft" requirements of composite material in the cured state, for repairing main oil pipelines according to composite sleeve technology.

The side walls are made of composite material with a modulus of elasticity at least equal to 130 GPa, which is the closest value to the modulus of elasticity of the pipe steel.

The length of the side walls is less than the length of the sleeve and its value depends on the diameter of the pipe to be repaired and ranges from 50-200mm.

In the operating state, the end of the sleeve protrudes relative to the end of the side wall.

The sleeve and the side wall are formed by interconnecting at least two parts mounted on the pipe.

The side wall parts comprise hinges on their edges, which are connected to each other by means of hinges which alternate with grooves for corresponding hinges; wherein the hinges are provided with inner bushings, the side wall parts being constructed to be coupled by communicating with said inner bushings The shafts are connected to each other, and when the side wall parts coincide, the hinges enter the corresponding grooves; wherein the coupling shaft has a smooth cylindrical part, the length of which is equal to the length of the side walls, and the diameter does not exceed the inner diameter of the bushing; and has a threaded part, in In the running state, the threaded part protrudes to the outside of the side wall by no less than 50-100mm; one end of the coupling shaft is provided with a stopper, and the other end is provided with a nut. Threaded connection with calibrated force.

The stop member can be embodied as a bolt head with a washer.

Depending on the material, type, working conditions and service life of the pipeline being repaired, the inner bushing, coupling shaft, washer and nut are made of metal or composite materials selected from glass fiber, carbon fiber reinforced plastic, basalt plastic.

Combination of inner bushings, coupling shafts, washers and nuts made of metal or composite materials in one repair structure.

Description of drawings

Describe the utility model with reference to accompanying drawing.

Fig. 1 shows the front view of the opening of the defective area of the composite tapered sleeve according to the utility model installed at the pipeline area with defects;

Figure 2 shows a side view of a section of a composite tapered sleeve according to the invention without a coupling shaft.

Detailed ways

The composite tapered sleeve comprises: a sleeve 2 mounted on a pipe 1 having a cylindrical inner surface corresponding to the diameter of the pipe; and a side wall 3 configured to fit with its inner surface on a corresponding outer surface of the sleeve superior. The sleeve is made of a cured composite material that resists compression and provides radial load transfer from the defect area to the sidewall; the sidewall is made of a composite material with a modulus of elasticity similar to steel (i.e. poor stretchability) production. During manufacture, the cavity 11 in the side wall is filled with the material from which the sleeve is made (eg fiberglass).

The outer surface of the sleeve 2 and the inner surface of the side wall 3 form a conical shape. The outer surface of the side wall can have any shape, in particular conical. The sleeve 2 (see FIG. 1 ) consists of at least two components, which are connected to each other when mounted on the pipe 1 with the defect 4 . In the embodiment shown, the sleeve consists of two constituent parts 2-a and 2-b (see Fig. 2). When repairing large-diameter pipes to optimize installation operations, the parts of the repaired structure become lighter. To this end, the sleeve and the side wall can consist of three or more parts.

The side wall 3 consists of at least two components. In the embodiment shown, the side wall consists of two parts 3-a and 3-b connected to each other by a shaft 5, wherein a stop member (eg in the form of a bolt head) is provided at one end of the shaft. The shaft 5 passes through the hinge 9, the inside of which is provided with a bushing 10. The bushing is designed to eliminate the gap between the inner surface of the hinge and the shaft that could cause bending stresses in the hinge and cracks to form in it. The stop is separated from the side wall by a gasket 6 . In addition to the fixing function, a washer 7 and a nut 8 placed on the other end of the shaft 5 together with the shaft 5 act as a device 12 for tightening the side walls on the sleeve and for alignment of the repair structure around the defective area of the pipe extrusion. To this end, the gasket 7 has a reinforced (eg square with rounded corners) shape.

The shaft 5, the washers 6 and 7 as well as the nut 8 and the bushing 10 can be made of metal and/or composite and polymer materials, depending on the condition and remaining time of the piping area to be repaired.

The sleeve 2 has a length longer than the side walls 3 for placing temporary devices at the edge of the sleeve such as compression straps with ratchets and/or stripper clips to compress and secure when the adhesive sticks to the pipe sleeve. Alternately remove the compression straps with ratchets and/or strippers while tightening the sidewalls on the sleeve.

When using the compound tapered sleeve according to the present invention, the repair of the defective pipe is as follows.

At the area of the pipe 1 with the defect 4 the barrier coating is removed to an extent that exceeds the length of the sleeve 2 . The surface of the pipe 1 is cleaned of residues of isolation and corrosion. The cavity of defect 4 is filled with a leveling material such as Etal plastic clay. Apply an adhesive compound such as Etal 45 to the clean surface of the pipe 1 and install the sleeve 2. During installation on the pipe 1, the components of the sleeve 2 are adhesively connected by side edges. The two parts 2-a and 2-b of the sleeve are pulled together by any arrangement (eg compression straps with ratchets), secured at the ends by stripper clips such as brake wedges, and the straps are removed. The side wall components 3 - a and 3 - b pass through the shaft 5 , connected via washers 6 and 7 to form the solid side wall 3 , and on the end of the shaft 5 a nut 8 is screwed. Thereafter, the adhesive compound is applied on the outer surface of the sleeve 2, the side wall 3 is moved along the axis of the pipe 1 on the sleeve 2, so that the gasket 7 is moved beyond the edge of the sleeve 2, and then by tightening the nut 8, Further tighten the side wall 3 on the sleeve 2 until the inner surface of the side wall 3 completely coincides with the outer surface of the sleeve 2, and reach the rated force of the fixing nut indicated by the manufacturer in the manual, which is specific to the installed maintenance structure The setting depends on the material of the side wall 3 and the type and operating conditions of the pipeline 1 to be repaired. The tightening calibration force is achieved by means of a dynamometer wrench of predetermined length. The components of the sidewall 3 are pulled together with calibrated forces to perform pre-tensioning of the assembled repair structure and nominal compression of the repair area in order to provide a tight seal and seal from the weakened defect area onto the composite sidewall 3 Efficient transmission of the radial loads of the sleeve 2, which is not weaker than the strength characteristics of a flawless steel pipe during the entire service life of the pipe.

Thus, the side wall 3 is fixed on the sleeve 2 by means of an axis 5 communicating with a hinge 9 provided with an embedded bush 10 (located on the side wall of the constituent part of the side wall, using a stop 5, a washer 6, 7 and nut 8).

The repaired area is then insulated, for example by means of heat-shrink tape overlapping the old insulation.

The corrosion resistance, high strength properties, sealing and dielectric properties of the materials used in this composite tapered sleeve, the tapered outer surface of the sleeve and the inner surface sidewall along with the adhesive compound ensure the elimination of the sleeve and sidewall The gap between the pipe and the sleeve increases the performance reliability of the repaired pipe to a defect-free level.

The composite tapered sleeve according to the invention does not require any further arrangements to secure the side walls on the composite sleeve and does not need to protect the side walls from sliding out of the sleeve during operation. These functions are carried out by coupling shafts with threads at the ends and corresponding washers and nuts. When screwed with calibrated force on the outer surface of a tapered composite sleeve pre-coated with adhesive compound, the side wall assembled from two or more parts assumes its structural position and transmits the resulting radial force give the tapered sleeve, which is then adhered to the defective area of the pipe, transmits the force to it, thereby pre-stretching the repair structure, and extruding the pipe with the force determined by the calculation, combined in this composite tapered sleeve The corrosion resistance, high strength properties, sealing and dielectric properties of the materials used in the repair area allow for a defect-free pipeline throughout the remaining useful life of the pipeline.

The utility model allows maintenance of pipelines on the ground and underwater. The application of the sleeve according to the invention optimizes the time and cost of maintenance operations, since no welding and lifting, hoisting and other mechanisms are required; since the sleeve and the side wall are composed of two or more parts, and in Manufactured under shop conditions in cured composite material, it is many times lighter than a similar component made of steel. In addition, the composite tapered sleeves provided do not require the use of active protection against soil corrosion (such as electrical connections to pipelines, cathodic protection stations, or protectors) ).

The manufacturing company specifies that the service life of the composite material used in the manufacture of the composite tapered sleeve shall not be less than 30 years.

Claims (7)

1. A composite tapered sleeve comprising a sleeve fitted over a pipe, said sleeve being made of solidified composite material in the form of a truncated cone, having a cylindrical channel along the axis, said channel having a diameter equal to that to be an outer diameter of the serviced pipe; and having a sidewall having an inner surface corresponding to an outer surface of the sleeve, wherein the sidewall is made of a cured composite material. 2. The composite tapered sleeve of claim 1, wherein the composite material constituting the sleeve and the sidewall is selected from fiberglass, carbon fiber reinforced plastic, and basalt plastic. 3. Composite conical sleeve according to claim 1, characterized in that said sleeve is made of composite material with a compressive strength at least equal to 70 MPa. 4. Composite tapered sleeve according to claim 1, characterized in that said side walls are made of a composite material with a modulus of elasticity at least equal to 130 GPa. 5. The composite tapered sleeve according to claim 1, wherein the sleeve and the side wall are formed by interconnecting at least two parts mounted on a pipe. 6. Composite tapered sleeve according to claim 5, characterized in that said side wall parts comprise hinges on their edges, which are connected to each other by said hinges, said hinges being connected with grooves for corresponding hinges Alternately; wherein the hinge is provided with an inner bushing, the side wall parts are configured to be connected to each other through a coupling shaft communicating with the inner bushing, and when the side wall parts are overlapped, the hinge enters a corresponding groove ; wherein the coupling shaft has a smooth cylindrical portion with a length equal to the length of the side wall and a diameter not exceeding the inner diameter of the bush; The outer side of the wall is not less than 50-100mm; one end of the coupling shaft is provided with a stopper, and the other end is provided with a nut, which is calibrated on the threaded part of the shaft through a washer abutting against the abutting end of the sleeve. Force screwed connections. 7. The composite tapered sleeve according to claim 6, wherein said inner bushing, said coupling shaft, said washer and said nut are made of metal or from glass fiber, carbon fiber reinforced plastic, basalt plastic Made of selected composite materials.