RU171397U1 - COMPENSATION DEVICE FOR INSULATED PIPELINE - Google Patents

Abstract

The compensating device of an insulated pipeline is designed to compensate for the axial temperature displacements of thermally hydro-insulated pipelines during operation. The device comprises a bellows compensator 2 connected by nozzles to the working pipe 1 and located in a rigid protective housing 3, consisting of two parts. The working tube 1 and the bellows expansion joint 2 are covered by a hydroprotective sheathing pipe 4. The hydroprotecting sheathing pipe 4 has a corrugated section 5, which is separated from the external environment by a heat-shrinkable casing 6, attached on one side to the hydroprotective sheathing pipe by an annular weld. An antifriction layer 13 is applied between the contacting surfaces of the corrugated portion 5 and the casing, and thermal insulation made of elastic material 8 is located under the corrugated portion 5. The protective casing is made of two parts that can axially move relative to each other. The durability and reliability of the design of the compensation device of an insulated pipeline is due to its sealing that is not disturbed by the deformation of the pipeline, which is achieved by creating conditions for unhindered axial movement of parts of the device when exposed to axial forces.

Description

The utility model is intended to compensate axial temperature deformations, protect against static or dynamic loads, absorb structural vibrations, ensure the integrity and tightness of systems, connect pipes of various types of pipelines of heating networks, hot water supply (DHW), water pipes and steam pipelines and can be used in the construction of systems pipelines in the power industry, oil and gas industry, construction, etc.

A device is known for compensating the temperature extensions of pipelines of a heating network (utility model patent RU 63901, September 29, 2006, IPC F16L 51/02), including an axial compensation element with nozzles rigidly attached to it, a safety casing covering the axial compensation element and partially nozzles, thermohydro-protective coating, in which, at the ends of the nozzles closest to the axial compensation element, centralizers are installed to ensure the alignment of the nozzles and the gap between the axial compensation element and dohranitelnym casing. The protective coatings in this device are made of polyurethane foam and a polymer shell, and consist of a fixed central part and two extreme movable parts, and the gaps between the fixed central part and the movable extreme parts are filled with an elastic heat insulator, and closed with compensating couplings on top.

The device is designed to compensate for the temperature extensions of pipelines, however, the design solution for waterproofing the gaps between the movable and stationary parts has low operational properties, which leads to the penetration of moisture into the insulation layer and premature exit, due to corrosion, of the entire assembly. In addition, the need to use two couplings significantly reduces the reliability of the entire device and, in addition, increases the cost of the product.

The closest analogue of the claimed utility model is a thermo-insulated bellows compensator according to patent RU 72038, 03/27/2008, IPC F16L 51/02. This compensator contains a steel bellows rigidly connected to metal pipes placed in a steel case, and thermal insulation made of polyurethane foam (PPU), a waterproof pipe-sheath made of polyethylene (PE) applied to them, around the steel pipe (on one or two sides of the steel bellows) a free from thermal insulation, an annular section on which a mineral wool thermal insulation layer is applied, protected by a heat-shrinkable sleeve, rigidly fixed to the waterproof pipe-shell on the side of the bellows and the adhesive tape, and on the other hand - between the sleeve and the jacket pipe hydroprotective coated tape of non-solidifying the sealing gasket.

The use of a known compensator is aimed at absorbing the temperature compensations of the pipeline passing in the axial direction, however, the hydro and thermal insulation of the entire product directly depends on the operation of the sealing units. In practice, seals are a weak link in the design and during long-term operation are not able to provide reliability from the effects of environmental factors, for example, from the penetration of groundwater or abrasive particles, and the thermal insulation layer made of mineral wool, under the influence of axial loads, crumple over time, lose its properties and ceases to perform the necessary functions.

The technical problem solved by the utility model is to increase the reliability of the compensation device of an insulated pipeline while increasing its life by giving its design the ability to perceive axial deformations, and, as a result, carry out axial movements in the soil without destroying the elements of the device, violating the integrity of the walls of the waterproof pipe - shell and integrity of the insulation layer.

In this case, reliability is understood as the property of the claimed device to perform its functions, maintaining operational performance (ensuring tightness) for a long time (reliability, durability) - see the Polytechnical Dictionary of Sec. ed. I.I. Artobolevsky, M., “Soviet Encyclopedia”, 1976, p. 306.

The technical result, which the utility model aims to achieve, is to increase the operational reliability of the compensation device of an insulated pipeline due to an increase in the level of sealing of the device due to synchronization of the perception (joint perception) of axial loads simultaneously by two elements: an internal movable steel compensator and a waterproofing element made in the form of a compliant in the axial direction of the polymer pipe-shell, while providing simultaneous protection e compliant parts from external influences.

The claimed design of the compensation device of the insulated pipeline, used for channel-free laying of pipelines, as well as the closest analogue, includes the following essential features:

- a steel bellows expansion joint, preferably stainless steel, permanently connected by means of nozzles to the working pipe and enclosed in a rigid steel protective housing;

- waterproof pipe-sheath made of polymer material;

- a layer of thermal insulation, placed in the annular cavity under the waterproof polymer pipe-shell.

The essential distinguishing features of the claimed utility model, which together with the essential features common with the closest analogue, ensure the achievement of the indicated technical result, are the following features:

- the pipe-shell is made with axially compliant corrugated section (corrugated sections);

- the corrugated section (corrugated sections) of the waterproof pipe-shell is tightly closed by a casing made of heat-shrinkable plastic covering it from the outside;

- one of the end sections of the casing is attached to the waterproof pipe-shell outside the corrugated section (preferably on the cylindrical part) with an annular weld. This is done so that the casing of the heat-shrinkable material and the waterproof pipe-shell have the possibility of mutual axial movement due to the attachment of the casing only near one end section and the presence of a second free end section that is not attached to the waterproof pipe-shell;

- under the surface of the corrugated portion of the waterproof pipe-sheath, there is a thermal insulation made of an elastic material, which, due to the properties of the thermal insulation material, does not impede movement, under the action of axial deformation, the corrugated section of the waterproof pipe-shell and a bellows compensator;

- the protective housing of the bellows expansion joint is made of two parts attached to the nozzles, not interconnected and, accordingly, having the possibility of axial movement relative to each other during operation of the bellows expansion joint;

- on the middle part of the casing, from the side of its inner surface, as well as in places of the most probable contact of the inner surface of the casing and the waterproof pipe-shell, an anti-friction layer can be applied, which ensures the mobility of the casing relative to the waterproof pipe-shell, which reduces the coefficient of friction between them and prevents abrasion during operation, both the inner surface of the casing and the corrugated peaks of the corrugated portion of the waterproof pipe-sheath.

The essential distinguishing features that characterize the utility model in particular cases of its execution and determine the achievement of the above technical result are the following features:

- An annular weld connecting the waterproof pipe-sheath and the casing can be closed by a heat-shrinkable tape;

- the waterproof pipe-shell of the device can consist of one element or be formed of two or more parts interconnected in a known manner, for example by butt welding, with the formation of a one-piece sealed structure, also performed without violating the integrity of the walls of the resulting pipe-shell (without cutouts , slots, holes, etc.);

The corrugated section of the waterproof pipe-sheath gives it the ability to compress or stretch simultaneously with the steel bellows compensator for axial displacement, due to the synchronous (joint) perception of axial loads simultaneously by two elements: an internal movable steel compensator and a flexible corrugated section of the waterproof pipe-sheath, which improves reliability and ensuring durability, in addition, maintaining the integrity of the walls of the water-proof pipe-shell guarantees ger etizatsiyu all products. The rest of the waterproof pipe shell is a conventional tubular shell made of a cylindrical polymer material. To ensure greater reliability, the flexible corrugated portion of the part of the waterproof pipe-shell is separated from the external environment by an annular protective casing located on top of the corrugated section of the waterproof pipe-shell and attached to it on one side, while the casing is firmly supported on the surface of the waterproof pipe the shells are both cylindrical and corrugated (at the tops of the corrugations).

The presence of an annular casing is necessary, because it provides long-term operability and does not interfere with axial movements of the compensation device of the insulated pipeline and the pipeline system as a whole. The casing, made by heat-shrinkable, protects the flexible corrugated section, or sections, pipe-shells from external influences, for example from the penetration of contaminants, mechanical damage and is installed on top of the corrugated section, or sections.

The specified technical result is ensured by performing thermal insulation from an elastic material (for example, from flexible polyurethane foam, or from foam rubber), which does not prevent the corrugated section of the waterproof pipe-sheath from being changed in shape, while the change in the shape of the corrugated pipe-sheath due to the elasticity of thermal insulation does not to its irreversible deformations.

The possibility of reversible deformation of the thermal insulation layer in the axial direction and ensuring the “continuity” of the thermal insulation layer (without crushing, the formation of voids), according to the utility model, is realized by applying combined thermal insulation, namely, the claimed device for compensating the thermal expansion of the heating network pipeline has heat insulation sections made both with the help of rigid polyurethane foam, and with the help of flexible (elastic) thermal insulation formed, for example, from flexible polyurethane foam tan, foam rubber, etc. At the same time, the location of the flexible section of thermal insulation made of elastic material coincides with the location of the corrugated ("bellows") section of the shell (located underneath).

The possibility of unobstructed axial movements is also facilitated by the implementation of the protective housing of the bellows expansion joint, consisting of two parts attached to nozzles having the possibility of axial movement relative to each other during operation of the steel bellows expansion joint.

The technical result is also provided due to the fact that the presence of an antifriction layer on the inner surface in the middle part of the casing provides mobility, protects against abrasion the contacting surfaces of the casing and the waterproof pipe-shell, and thereby guarantees the tightness of the product.

As one of the embodiments, the antifriction layer can be applied to the tops of the corrugations of the corrugated section.

Thus, all the essential features of the utility model are aimed at providing the specified technical result by creating conditions for unhindered axial movement of the parts of the device when exposed to forces acting in the axial direction, which increases the reliability and durability of the claimed device, eliminates damage to its parts, and also extends the life of the pipeline as a whole.

A pliable corrugated section made on a waterproof sheath pipe gives it the ability to perceive axial deformation without breaking simultaneously with a steel bellows compensator, and the corrugated section of the waterproof sheath pipe is reliably protected from the environment by an annular protective casing installed over the corrugated section and extending beyond this section on the cylindrical surface of the pipe-shell, while the casing is attached only from one end to the cylindrical part of the pipe - shells, which allows the sheath pipe in the presence of axial movements to freely slide on the inner surface of the casing (the second end part of the casing is not fixed to the sheath pipe), which also contributes to the antifriction coating applied to the contacting surfaces of the casing and the waterproof pipe-sheath (on the inner the surface of the casing and / or the corrugation top), while the casing is firmly supported on the surface of the waterproof pipe-shell both on the cylindrical and corrugated section (along the corrugation tops) and has st movement relative to them; in addition, the use of thermal insulation from an elastic material under the corrugated section does not prevent axial deformations of the corrugated section of the waterproof pipe-shell and bellows compensator and eliminates the destruction of thermal insulation under the influence of deforming corrugations; at the same time, the execution of a rigid protective housing of the bellows compensator from two parts not connected to each other, attached to the nozzles connected to the corresponding part of the working pipe on opposite sides of the steel bellows compensator mounted in the working pipe, allows their axial movement relative to each other.

The essence of the claimed utility model is illustrated by the drawing, which shows the construction of a compensation device that perceives the temperature axial movements of an insulated pipeline, a general view.

In the drawing, the positions indicated:

1 - a working pipe;

2 - steel bellows axial displacement compensator;

3 - protective steel housing of the bellows expansion joint;

4 - waterproof pipe-shell;

5 - corrugated section on a waterproof pipe-sheath;

6 - a casing;

7 - thermal insulation from rigid polyurethane foam;

8 - thermal insulation from an elastic material, for example, foamed rubber;

9 - conductors of the operational-remote control system;

10 - an annular seam of the connection of the waterproof pipe-shell with the casing;

11 - an annular seam of a waterproof pipe-shell formed, for example, in two parts, by butt welding;

12 - heat-shrinkable tape overlapping an annular weld;

13 - anti-friction layer deposited on the inner surface in the middle part of the casing.

To simplify the design image, auxiliary elements in the form of centering supports and others are not conventionally shown.

The compensating device of the insulated pipeline is installed on the site of the pipeline system and is permanently connected to the working pipe 1 (built into the working pipe of the pipeline) by means of pipes. When a device is installed in a pipeline, a waterproof pipe-shell is connected to adjacent waterproof pipe-shell pipes through a heat-shrinkable sleeve, and the formed annular space between them is insulated, for example, with foaming components.

The design of the compensation device of the insulated pipeline contains a stainless steel bellows compensator 2 (hereinafter referred to as the bellows compensator 2), on each side of which the nozzles are permanently fixed for connection to the working pipe, and the bellows compensator 2 is enclosed in a hard metal protective case 3. Rigid protective the housing 3 is made of two parts (see drawing), each of which is connected to the working pipe or the corresponding pipe, while the place of hard connection of the protective housing 3 with atrubkami arranged on both sides of the bellows compensator 2.

The location zone of the bellows compensator 2 is covered by a waterproof pipe-sheath 4, in the cavity under which a layer of thermal insulation is placed. The thermal insulation layer may be a combined thermal insulation, i.e. a combination of two heat-insulating materials, namely, part of the thermal insulation layer is formed by a layer 7 of solid thermal insulation material, for example, rigid polyurethane foam, and the other part by a layer 8 of elastic material, for example, elastic polyurethane foam, foamed rubber, etc.

The waterproof pipe-sheath 4 can be formed by one element or be made of separate parts, in particular two, three or more, while these parts are inseparably and tightly interconnected in a known manner, for example by butt welding, with the formation of a single structure. The drawing shows an example in accordance with which the waterproof pipe-sheath 4 is formed of two parts, butt welded with an annular seam in the place shown at 11 in the drawing.

At least on one part of the waterproof pipe-sheath 4, a flexible corrugated section 5 is made necessary to allow the waterproof pipe-sheath 4 to perform axial movements (compress, stretch) during axial movements of the bellows compensator 2. Corrugated section 5 can be performed on one, on two (or more) parts of the waterproof pipe-sheath 4, for example, on both sides of the bellows expansion joint 2 (the drawing shows an example with one corrugated section 5), namely the corrugated section 5 ozhet located both above the steel bellows compensator in the middle of the device and is closer to one end or, when there are two or more corrugated portions - simultaneously in several places, for example, in the middle and near the end (ends) of the device.

In order for the thermal insulation layer not to prevent deformation of the corrugated section 5, a thermal insulation layer 8 of elastic thermal insulation material is placed under the surface of this section 5. The thermal insulation layer 8 of elastic thermal insulation material may be located under the surface of each corrugated portion 5 of the waterproof pipe-sheath, if there are more than one such portion. An elastic heat-insulating material, for example, flexible polyurethane foam, does not impede the change in the configuration of the corrugated portion of the waterproof pipe-shell, deforming under its influence. The rest of the waterproof pipe-shell - a tubular shell with a layer of insulation 7 from a cured, for example, hard PPU.

Layers of thermal insulation 7 and 8 of rigid polyurethane foam and elastic thermal insulation material, respectively, are located in the annular cavity between the waterproof pipe-sheath 4 and the working pipe 1 with a bellows compensator 2 and contain conductors of the operational remote monitoring system 9 (SODK).

The corrugated section 5 of the waterproof pipe-sheath 4 gives it the ability to simultaneously compress or stretch when compressing or stretching the bellows compensator 2, and the layer 8 of elastic thermal insulation material is deformed under the influence of the corrugated section 5 of the waterproof pipe-sheath 4. The corrugated section 5 of the waterproof pipe-sheath 4 separated from the external environment by means of an annular protective casing 6 located in the area of the corrugated portion 5 of the waterproof pipe-sheath 4 on top of of section 5. This is done to prevent external influence on the corrugations of the corrugated section 5 of the waterproof pipe-sheath 4, for example, to prevent soil from entering the corrugations, which can change the properties of the corrugated section, mechanically damage it, reduce the operability and reliability of the device as a whole, or affect on the tightness of the device.

On the one hand, near the end, the casing 6 is firmly attached to the outer surface of the water-proof pipe-sheath by an annular weld seam 10, and after heat shrinkage, the casing is firmly supported on the surface sections of the water-proof pipe-sheath 4 in contact with it.

The length of the casing overlapping the corrugated portion (or portions) is made sufficient to cover the corrugated portion (or portions) and at the same time exceeds the length of the corrugated portion. If there is more than one corrugated section, it is possible to install covers on each individual corrugated section.

To reduce the friction forces of the soil and protect the annular weld 10, it is tightly closed on top with a heat-shrinkable tape 12, the edges of which slightly extend on the outer surfaces of the casing and the waterproof pipe-sheath, and an antifriction layer 13 is applied between the contacting surfaces of the casing and the waterproof pipe-sheath.

The casing 6 is pushed from above and placed over the corrugated part of the waterproof pipe-shell 4, then it is heat-shrinkable by known methods, for example, a gas burner, and then near one of the ends of the casing 6 they are attached to the waterproof pipe-shell 4 using a welded ring weld 10. This technological the operation can be performed both during the production of the compensation device at the manufacturing plant, and during the installation process.

Previously, an antifriction layer 13 is applied to the inner surface of the casing and / or to the corrugation tops. The resulting seam 10 is protected from the influence of the external environment (ground friction forces) by applying heat-shrinkable tape 12 over it, which is also heat-shrinkable using the above-mentioned known method. As a result, the casing 6 is tight, i.e. without gaps, it adheres with both end parts to the cylindrical outer surfaces of the shell pipe, and the middle part to the corrugations on the shell pipe 4.

Claims (7)

1. The compensation device of an insulated pipeline containing a bellows compensator of axial displacements, one-piece connected to the nozzles attached to the working pipe, and enclosed in a protective housing, a waterproof pipe-sheath made of a polymer material, and a layer of insulation placed under the waterproof pipe-sheath, characterized in that that the waterproof pipe-shell is made with a compliant corrugated portion closed tightly wrapped outside by a heat-shrinkable casing attached on one side to a water-proof pipe-sheath with an annular weld, while an antifriction layer is applied between the contacting surfaces of the corrugated part of the water-proof pipe-sheath and the casing, and under the corrugated part of the water-proof pipe-sheath there is a thermal insulation made of elastic material, and the protective case is made of two parts with the possibility of axial moving relative to each other. 2. Compensation device according to claim 1, characterized in that the annular weld connecting the casing with the waterproof pipe-sheath is closed by a heat-shrinkable tape over the connection, partially overlapping the end edge of the casing and the surface of the waterproof pipe-sheath. 3. Compensation device according to claim 1, characterized in that the waterproof pipe-shell is formed of separate parts, one-piece and tightly interconnected. 4. Compensation device according to claim 1, characterized in that the compliant corrugated portion of the waterproof pipe-sheath is located above the steel bellows expansion joint in the middle of the device. 5. The compensation device according to claim 1, characterized in that the compliant corrugated portion of the waterproof pipe-sheath is located near one of the ends of the device. 6. The compensation device according to claim 1, characterized in that an additional flexible corrugated portion is made on the waterproof pipe-shell, closed by a heat-shrinkable casing tightly surrounding it, attached on one side to the waterproof pipe-shell with an annular weld, while between the contacting surfaces the corrugated section of the waterproof pipe-shell and the casing is coated with an antifriction layer, and under the corrugated section of the waterproof pipe-shell the thermal insulation is made of elastic of material, the protective housing is made of two parts having axially movable relative to each other. 7. Compensation device according to claim 6, characterized in that the corrugated portion of the waterproof pipe-sheath is located in the middle part of the device, and the additional corrugated portion is located in the vicinity of one of the ends of the device.

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