A method, connection structure and device for non-destructive replacement of tracing pipes

Abstract

The present invention discloses a method for non-destructive replacement of a tracing pipe, a connection structure and a device, which includes a pipe extraction device, a tracing pipe to be replaced, and a replacement tracing pipe. The diameter of one end of the replacement tracing pipe is slightly smaller than that of one end of the tracing pipe to be replaced. It further includes: connection step A: connecting one end of the tracing pipe to be replaced with one end of the replacement tracing pipe; connection step B: connecting the other end of the tracing pipe to be replaced with the pipe extraction device; extraction and replacement step: starting the pipe extraction device to extract the tracing pipe to be replaced out of the external thermal insulation layer and allowing the replacement tracing pipe to enter the position before the tracing pipe to be replaced; disassembly step: disassembling the tracing pipe to be replaced. The present invention can replace the tracing pipe without damaging the external thermal insulation layer, saving a large amount of labor, material and time costs, and significantly improving the construction efficiency and economic benefits.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam tracing, and particularly relates to a method for replacing a tracing pipe without damage, a connection structure and a device. Background Art

[0002] At present, in industries such as energy, petroleum, chemical industry, and electric power, steam tracing systems are often used to heat or insulate pipelines and equipment. The tracing pipes of the well-known traditional steam tracing systems mainly use carbon steel pipes, and high-temperature steam flows inside the pipes. Although carbon steel pipes are inexpensive, they have many disadvantages. After being used for a period of time, the inside of the pipes rusts, affecting the reuse of circulating water, and easily causing blockage and damage of pipeline valves. There are water-soluble chloride ions inside the insulation material outside the pipes. If the outer sheath is damaged or the joint seal is not tight, chloride ion enrichment will cause corrosion perforation of the tracing pipes. In view of the existing problems, in recent years, industries such as petroleum and chemical industry have gradually started to use new types of steam integrated tracing systems to replace traditional steam integrated tracing systems, and use stainless steel welded pipes with anti-corrosion coatings outside the pipes to replace traditional carbon steel pipes. The wall thickness of stainless steel welded pipes is thinner than that of carbon steel pipes, the installation is more convenient, and the corrosion resistance is strong. Under the condition of ensuring the same flow area, the outer diameter of stainless steel welded pipes is smaller than that of carbon steel pipes. However, at present, the tracing pipes used at the user site and the pipelines or equipment to be traced need to be insulated outside. If they are to be replaced, the insulation layer needs to be removed and re-arranged, which will consume a large amount of manpower and material resources and the cost is too high. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the present invention provides a method for replacing a tracing pipe without damaging the outer insulation layer, saving manpower and material resources, a connection structure and a device, which can be widely applied to the replacement construction of tracing pipes in steam integrated tracing systems in industries such as energy, petroleum, chemical industry, and electric power.

[0004] In a first aspect, a method for replacing a tracing pipe without damage includes a pipe extraction device, a tracing pipe to be replaced, and a replacement tracing pipe; it also includes:

[0005] Connection step A: One end of the tracing pipe to be replaced is connected to one end of the replacement tracing pipe;

[0006] Connection step B: The other end of the tracing pipe to be replaced is connected to the pipe extraction device;

[0007] Extraction and replacement step: Start the pipe extraction device to extract the tracing pipe to be replaced out of the outer insulation layer, and let the replacement tracing pipe enter the position before the tracing pipe to be replaced;

[0008] Disassembly step: Remove the tracing pipe to be replaced.

[0009] As an optimization, it further includes an inner clamping die core that is thinner in the middle and thicker at both ends; the diameter of the replacement tracing heat pipe is slightly smaller than that of the traced heat pipe to be replaced; the connection step A: one end of the traced heat pipe to be replaced is connected to one end of the replacement tracing heat pipe, which specifically includes the following steps:

[0010] One end of the replacement tracing heat pipe is inserted into one end of the traced heat pipe to be replaced to form an overlapping section, so that the inner clamping die core enters the position inside the overlapping section and crushes and clamps the overlapping section in the middle of the inner clamping die core.

[0011] As an optimization, it further includes an outer protective sleeve;

[0012] Before the connection step A, the following steps are further included:

[0013] The outer protective sleeve is sleeved on the outside of the replacement tracing heat pipe;

[0014] After the connection step A and before the extraction replacement step, the following steps are further included:

[0015] The outer protective sleeve is reinstalled on the outside of the overlapping section to cover the overlapping section, so that the traced heat pipe to be replaced and the replacement tracing heat pipe are seamlessly docked.

[0016] As an optimization, it further includes a stop ring and an outer protective sleeve;

[0017] Before the connection step A, the following steps are further included:

[0018] The outer protective sleeve is sleeved on the outside of the replacement tracing heat pipe;

[0019] After the connection step A and before the extraction replacement step, the following steps are further included:

[0020] A stop ring is arranged on the outside of the overlapping section;

[0021] The outer protective sleeve is reinstalled on the outside of the overlapping section to cover the overlapping section and the stop ring, so that the traced heat pipe to be replaced and the replacement tracing heat pipe are seamlessly docked;

[0022] The outer protective sleeve and the stop ring are fixed.

[0023] In a second aspect, a connection structure for non-destructively replacing a tracing heat pipe includes a traced heat pipe to be replaced and a replacement tracing heat pipe, the diameter of the replacement tracing heat pipe is slightly smaller than that of the traced heat pipe to be replaced, and one end of the replacement tracing heat pipe extends into the traced heat pipe to form an overlapping section; it further includes an inner clamping die core that is thinner in the middle and thicker at both ends and is located inside the overlapping section, and the overlapping section is crushed and clamped in the middle of the inner clamping die core.

[0024] As an optimization, it also includes an outer sheath pipe that is sleeved on the outside of the overlapping section of the replacement heating pipe and the replaced heating pipe, and the outer sheath pipe is used to make the replaced heating pipe and the replacement heating pipe seamlessly connected.

[0025] As an optimization, it further includes a block ring arranged on the outside of the overlapping section and the inside of the outer sheath tube, and the block ring is fixed to the outer sheath tube.

[0026] As an optimization, the inner clamping mold core is in the shape of a dumbbell with polygonal ends.

[0027] In a third aspect, a device for non-destructive replacement of a heat tracing pipe includes a pipe extraction device, a heat tracing pipe to be replaced, and a replacement heat tracing pipe, wherein one end of the heat tracing pipe to be replaced is connected to the pipe extraction device, and the other end of the heat tracing pipe to be replaced is connected to the replacement heat tracing pipe;

[0028] The pipe extraction device is used to extract the replaced heating pipe from the outer insulation layer along the axial direction, and allow the replacement heating pipe to enter the position before the replaced heating pipe is replaced.

[0029] As an optimization, the other end of the replaced heating pipe is clamped and connected to the replacement heating pipe through any of the aforementioned non-destructive replacement connection structures for heating pipes.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. By using a pipe extraction device to extract the replaced heating pipe locked with the replacement heating pipe from the outer insulation layer, and allowing the replacement heating pipe to replace the replaced heating pipe in the outer insulation layer, it is possible to remove the original heating pipe and replace it without removing the outer insulation layer. The replaced heating pipe remains in the position of the original heating pipe and does not require additional arrangement. Compared with the existing technology, it saves a lot of manpower, material resources and time costs, and significantly improves construction efficiency and economic benefits.

[0032] 2. The use of an inner clamping die core improves the tensile strength of the connection between the replaced heating pipe and the replacement heating pipe, which can effectively prevent the connection between the replaced heating pipe and the replacement heating pipe from falling off when replacing the heating pipe;

[0033] 3. By arranging an outer sheath pipe on the outside of the connection section of the replaced heat tracing pipe and the replacement heat tracing pipe, the connection between the two can be seamlessly connected, solving the problem of interference with obstacles and binding wires during the pipe extraction process;

[0034] 4. By arranging a block ring on the outside of the overlap section and fixing it to the outer sheath tube, the tensile strength is further improved in cooperation with the inner clamping mold core located on the inner side of the overlap section. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1Schematic diagram of the first process of a method for non-destructive replacement of a tracing pipe according to the present invention;

[0036] Figure 2 Schematic diagram of the second process of a method for non-destructive replacement of a tracing pipe according to the present invention;

[0037] Figure 3 Schematic diagram of the third process of a method for non-destructive replacement of a tracing pipe according to the present invention;

[0038] Figure 4 Schematic diagram of the fourth process of a method for non-destructive replacement of a tracing pipe according to the present invention;

[0039] Figure 5 Schematic diagram of the structure of a connection structure for non-destructive replacement of a tracing pipe according to the present invention;

[0040] Figure 6 Schematic diagram of the structure of a device for non-destructive replacement of a tracing pipe according to the present invention;

[0041] Wherein, 1, a pipe extraction device; 2, an outer thermal insulation layer; 3, a pipe to be traced; 4, a tracing pipe to be replaced; 5, a replacement tracing pipe; 6, an inner clamping die core; 7, a stop ring; 8, an outer protective sleeve; 9, a fastening device. Detailed implementation manners

[0042] In order to make the technical means, creative features, achieved purposes and functions of the invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0043] In the first aspect of the present invention, a method for non-destructive replacement of a tracing pipe, as Figure 1 、 5 shown, includes a pipe extraction device 1, a tracing pipe 4 to be replaced, and a replacement tracing pipe 5; the tracing pipe 4 to be replaced is arranged parallel to the periphery of the pipe 3 to be traced, and the outer sides of the pipe 3 to be traced and the tracing pipe 4 to be replaced are surrounded by an outer thermal insulation layer 2; further includes:

[0044] Connection step A: One end of the tracing pipe 4 to be replaced is connected to one end of the replacement tracing pipe 5;

[0045] Connection step B: The other end of the tracing pipe 4 to be replaced is connected to the pipe extraction device 1;

[0046] Extraction and replacement step: Start the pipe extraction device 1 to extract the tracing pipe 4 to be replaced from the outer thermal insulation layer 2, and let the replacement tracing pipe 5 enter the position before the tracing pipe 4 to be replaced;

[0047] Disassembly step: Remove the tracing pipe 4 to be replaced.

[0048] Among them, the replaced tracing heat pipe can be a carbon steel pipe, and the replacement tracing heat pipe can be a stainless steel welded pipe; those skilled in the art can understand that the replaced tracing heat pipe and the replacement tracing heat pipe in the present invention are not limited to the above examples, and can be all products that can be used as tracing heat pipes, as long as the method for non-destructive replacement of the tracing heat pipe can be implemented. The pipe extraction device refers to a device that can be used to extract the replaced tracing heat pipe from the external thermal insulation layer. In practical applications, devices such as a pipe extractor and a winch can be used ( Figure 1 shown in the pipe extractor). The connection step A between the replaced tracing heat pipe and the replacement tracing heat pipe and the connection step B between the replaced tracing heat pipe and the pipe extraction device do not have a specific order and can be selected according to the actual situation. The connection between the replaced tracing heat pipe and the replacement tracing heat pipe can be flexibly adopted in a variety of connection methods.

[0049] In this embodiment, by using a pipe extraction device to extract the replaced tracing heat pipe connected to the replacement tracing heat pipe from the external thermal insulation layer and allowing the replacement tracing heat pipe to replace the position of the replaced tracing heat pipe in the external thermal insulation layer, the original tracing heat pipe is taken out and replaced without removing the thermal insulation layer. The replaced tracing heat pipe is still in the original position of the original tracing heat pipe and does not require additional arrangement. Compared with the prior art, a large amount of labor, material and time costs are saved.

[0050] In one embodiment, as Figure 2 、 6 shown, it further includes an inner clamping die core 6 that is thinner in the middle and thicker at both ends; the diameter of one end of the replacement tracing heat pipe 5 for connection is slightly smaller than that of the corresponding connected end of the replaced tracing heat pipe 4. The connection step A: connecting one end of the replaced tracing heat pipe 4 with one end of the replacement tracing heat pipe 5 specifically includes the following steps:

[0051] One end of the replacement tracing heat pipe 5 is inserted into one end of the replaced tracing heat pipe 4 to form an overlapping section, and the inner clamping die core 6 enters the position inside the overlapping section and presses and clamps the overlapping section in the middle of the inner clamping die core 6.

[0052] Among them, the diameter of one end of the replacement tracing heat pipe for connection is slightly smaller than that of the corresponding connected end of the replaced tracing heat pipe, as long as it satisfies that the replacement tracing heat pipe can be inserted into the replaced tracing heat pipe; since traditional tracing heat pipes mostly adopt specifications of DN15 and DN20, the corresponding replacement tracing heat pipes can adopt specifications with an outer diameter of 1 / 2 inch (12.7 mm) and 3 / 4 inch (19.05 mm), where 1 / 2 inch (12.7 mm) corresponds to DN15 and 3 / 4 inch (19.05 mm) corresponds to DN20. The overlapping section refers to the overlapping part of the replacement tracing heat pipe and the replaced tracing heat pipe after the replacement tracing heat pipe is inserted into the replaced tracing heat pipe. The inner clamping die core can be first placed in the replaced tracing heat pipe or the replacement tracing heat pipe and then the two pipes are overlapped, or the two pipes can be overlapped first and then the inner clamping die core is placed inside the overlapping section, which can be flexibly selected according to the specific situation.

[0053] Among them, considering the potential safety hazards associated with the use of fire in industries such as petroleum and chemical engineering, and the strict management of fire use in on-site operations, in this embodiment, a fire-free connection method is designed for the replacement of the accompanying heat pipe and the heat pipe to be replaced. That is, by arranging an inner clamping die core with a thinner middle and thicker ends on the inner side of the overlapping section of the two pipes, and pressing the overlapping section against the middle of the inner clamping die core to achieve the connection of the two pipes, which complies with the safety specifications of on-site operations. Additionally, the pipe extraction device can be powered by batteries instead of being connected to the mains electricity to avoid the occurrence of electric sparks and further improve the safety factor.

[0054] Specifically, the inner clamping die core can be dumbbell-shaped, and the two ends can be polygonal. For example, it can be hexagonal (such as hexagonal cast iron), quadrilateral, etc. Compared with a circular shape, the polygonal structure can increase the tensile strength at the connection between the heat pipe to be replaced and the replacement heat pipe, effectively preventing the connection between the heat pipe to be replaced and the replacement heat pipe from falling off during the replacement of the accompanying heat pipe.

[0055] In one embodiment, as Figure 3 、 6 shown, the locking structure further includes an outer protective sleeve 8;

[0056] Before the connection step A, the following steps are further included:

[0057] Set the outer protective sleeve 8 on the outside of the replacement heat pipe 5;

[0058] After the connection step B and before the extraction step, the following steps are further included:

[0059] Install the outer protective sleeve 8 back to the outside of the overlapping section, covering the overlapping section and its surroundings to make the heat pipe to be replaced 4 and the replacement heat pipe 5 butt seamlessly.

[0060] Among them, the outer protective sleeve can be made of hard rubber material or forgings.

[0061] In this embodiment, setting an outer protective sleeve on the outside of the connection section between the heat pipe to be replaced and the replacement heat pipe can make the connection between the two butt seamlessly, solving the problem of interference with obstacles and binding wire during the pipe extraction process.

[0062] In one embodiment, as Figure 4 、 6 shown, the locking structure further includes a stop ring 7 and an outer protective sleeve 8;

[0063] Before the connection step A, the following steps are further included:

[0064] Set the outer protective sleeve 8 on the outside of the replacement heat pipe 5;

[0065] After the connecting step B and before the pulling out and replacing step, the method further includes the following steps:

[0066] A stopper ring 7 is provided on the outside of the overlap section;

[0067] Install the outer sheath 8 back to the outside of the overlapped section, covering the overlapped section, the block ring 7 and its surroundings, so that the replaced heat tracing pipe 4 and the replacement heat tracing pipe 5 are seamlessly connected;

[0068] The outer sheath tube 8 and the block ring 7 are fixed with a fastening device 9 .

[0069] The stopper ring may be composed of two semicircles. The outer sheath tube may be made of hard rubber or a forging. The fastening device may be a screw. For example, bolt holes may be provided at corresponding positions on both sides of the stopper ring and the outer sheath tube, and secured with hexagon socket screws.

[0070] In this embodiment, the block ring is arranged on the outside of the overlapping section and fixed to the outer sheath tube. By cooperating with the inner clamping mold core located on the inner side of the overlapping section, the tensile strength can be further improved.

[0071] The second aspect of the present invention is a heat tracing pipe non-destructive replacement connection structure, such as Figure 6 As shown, it includes a replaced heating pipe 4 and a replacement heating pipe 5, wherein the diameter of one end of the replacement heating pipe 5 is slightly smaller than that of the replaced heating pipe 4, and the one end of the replacement heating pipe 5 is inserted into the replaced heating pipe 4 to form an overlapping section; it also includes: an inner clamping mold core 6 located on the inner side of the overlapping section, which is thinner in the middle and thicker at both ends, and the overlapping section is flattened and clamped in the middle of the inner clamping mold core 6.

[0072] In one embodiment, Figure 6 As shown, it also includes an outer sheath pipe 8 which is sleeved on the outside of the overlapping section of the replacement heating pipe 5 and the replaced heating pipe 4. The outer sheath pipe 8 is used to make the replaced heating pipe 4 and the replacement heating pipe 5 seamlessly connected.

[0073] The outer sheath can be made of hard rubber or a forged piece. Using the outer sheath allows the outer side of the compressed and deformed overlapped section to maintain its round shape, allowing the replaced heat tracing pipe to seamlessly connect with the replacement heat tracing pipe, eliminating the potential for obstruction during pipe extraction.

[0074] In one embodiment, Figure 6 As shown, it also includes a block ring 7 arranged on the outside of the overlapping section and the inside of the outer sheath tube 8. The block ring 7 can be fixed to the outer sheath tube 8 by a fastening device 9.

[0075] The stopper ring may be composed of two semicircles. The outer sheath tube may be made of hard rubber or a forging. The fastening device may be a screw. For example, bolt holes may be provided at corresponding positions on both sides of the stopper ring and the outer sheath tube, and secured with hexagon socket screws.

[0076] The third aspect of the present invention is a device for non-destructive replacement of heat tracing pipes, such as Figure 5 As shown, it includes a pipe extraction device 1, a heat tracing pipe to be replaced 4, and a replacement heat tracing pipe 5. One end of the heat tracing pipe to be replaced 4 is connected to the pipe extraction device 1, and the other end of the heat tracing pipe to be replaced 4 is detachably locked and connected to the replacement heat tracing pipe 5;

[0077] The pipe extraction device 1 is used to extract the replaced heating pipe 4 from the outer insulation layer 2 along the axial direction, and allow the replacement heating pipe 5 to enter the position before the replaced heating pipe 4 is replaced.

[0078] The replaced heat tracing pipe is arranged parallel to the surrounding heat tracing line, and the heat tracing line and the replaced heat tracing pipe are surrounded by an outer insulation layer. When the pipe extraction device extracts the replaced heat tracing pipe from the outer insulation layer, the replacement heat tracing pipe enters the position where the replaced heat tracing pipe was before the replacement, thereby completing the replacement of the heat tracing pipe.

[0079] In one embodiment, Figure 5 、 6 As shown, the other end of the replaced heating pipe 4 is clamped and connected to the replacement heating pipe 5 through a heating pipe lossless replacement connection structure; the heating pipe lossless replacement connection structure is as described in the second aspect of the present invention.

[0080] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions that fall within the principles of the present invention fall within the scope of protection of the present invention. For those skilled in the art, any improvements made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for non-destructive replacement of tracing pipes, characterized in that: It includes a tube extraction device, a heat tracing pipe to be replaced, and a replacement heat tracing pipe; it further includes: Connection step A: One end of the heat tracing pipe to be replaced is connected to one end of the replacement heat tracing pipe; Connection step B: The other end of the heat tracing pipe to be replaced is connected to the tube extraction device; Extraction and replacement step: Start the tube extraction device to extract the heat tracing pipe to be replaced from the external thermal insulation layer, and let the replacement heat tracing pipe enter the position before the heat tracing pipe to be replaced; Disassembly step: Remove the heat tracing pipe to be replaced; It further includes an inner clamping die core with a thinner middle and thicker ends; the diameter of the replacement heat tracing pipe is slightly smaller than that of the heat tracing pipe to be replaced; the connection step A: One end of the heat tracing pipe to be replaced is connected to one end of the replacement heat tracing pipe, which specifically includes the following steps: One end of the replacement heat tracing pipe is inserted into one end of the heat tracing pipe to be replaced to form an overlapping section, so that the inner clamping die core enters the position inside the overlapping section and flattens and clamps the overlapping section in the middle of the inner clamping die core; It further includes a stop ring and an outer protective sleeve; Before the connection step A, the following steps are further included: The outer protective sleeve is sleeved on the outside of the replacement heat tracing pipe; After the connection step A and before the extraction and replacement step, the following steps are further included: A stop ring is arranged on the outside of the overlapping section; The outer protective sleeve is reinstalled on the outside of the overlapping section to cover the overlapping section and the stop ring, so that the heat tracing pipe to be replaced and the replacement heat tracing pipe are seamlessly butted; The outer protective sleeve and the stop ring are fixed.

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