High-temperature and high-pressure pipeline fitting and machining and manufacturing method thereof

Abstract

The invention discloses a high-temperature and high-pressure pipeline fitting and a machining and manufacturing method thereof.The high-temperature and high-pressure pipeline fitting comprises a heat preservation layer, a connecting spring, an external pipeline and an internal pipeline; a connecting spring is arranged on the inner wall of the internal pipeline, a heat preservation layer is arranged outside the internal pipeline, and an external pipeline is arranged outside the heat preservation layer; the invention discloses a machining and manufacturing method for a high-temperature and high-pressure pipeline pipe fitting. The machining and manufacturing method comprises the following steps that S1, an internal pipeline is machined; s2, a heat preservation layer is machined; s3, machining an external pipeline; s4, a heat preservation layer and an internal pipeline are assembled; s5, a heat preservation layer, a connecting spring, the internal pipeline and the external pipeline are installed in a butt joint mode; the problems of large pipeline size, high working condition risk degree, high transportation cost, small installation plasticity, hard force loss and pipeline hardness reduction caused by hard force reduction caused by high temperature and high pressure change in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the field of high-temperature and high-pressure pipe fittings, and in particular to a high-temperature and high-pressure pipeline fitting and a processing and manufacturing method thereof. Background Art

[0002] High-temperature and high-pressure pipelines are usually used in the petroleum, chemical, energy and other industries. These pipelines need to withstand extremely high temperatures and pressures. However, the higher the temperature and pressure, the greater the decrease in the hardness of the material. This is also a defect that conventional high-temperature and high-pressure pipelines cannot avoid.

[0003] In order to compensate for the hardness loss of the pipeline caused by high temperature and high pressure, the present invention adopts an inner pipeline insulation layer. The temperature is reduced layer by layer by utilizing the insulation layer. When the temperature is finally transferred to the outer wall of the pipeline, the temperature is directly exchanged with the atmosphere through the external pipeline leakage. In this way, the temperature of the external pipeline will not be affected when the temperature is increased. This changes the condition of the pipeline and solves the risk of reduced pipeline hardness.

[0004] Prior art related to the present invention

[0005] Currently, the most common high-temperature and high-pressure pipelines are made of 304\316\347\P91\P92\Inconel625 and other pipeline materials, all of which use thickened walls to increase strength and are wrapped with silicate insulation on the outside.

[0006] Technical solutions of the prior art

[0007] The existing high-temperature and high-pressure pipeline is composed of a pipe body 1, a heat-insulating material 2, and an external protective structure 3.

[0008] Disadvantages of existing technology

[0009] Main problems of high temperature and high pressure pipes:

[0010] 1) After the existing high-pressure and high-temperature pipelines are exposed to high temperatures, the hardness of the material decreases and it is difficult to withstand the expansion force of high pressure. In this way, the pipeline is prone to bursting and the surrounding environment and working conditions become worse. In order to compensate for the decrease in hardness, the existing technology uses material stacking thickness and density to achieve a series of problems caused by the decrease in hardness to the pipeline, but such a risk environment continues to exist.

[0011] 2) The pipe wall is too thick, which increases the difficulty and complexity of transportation and construction;

[0012] Thicker pipe walls and insulation layers require more materials, which directly leads to an increase in material costs; thicker-walled pipes may generate greater rigidity during operation, increasing the risk of pipe deformation and damage;

[0013] 3) During later maintenance, the repair and replacement of thick-walled pipes is more difficult and takes longer. Summary of the invention

[0014] In order to solve the problems existing in the prior art, the present invention provides a high-temperature and high-pressure pipeline fitting and a processing and manufacturing method thereof, which solves the problems in the prior art of large pipeline volume, high working condition risk, high transportation cost, low installation plasticity, hardness loss, and reduced pipeline hardness caused by the decrease in hardness of the pipeline due to the change of high temperature and high pressure.

[0015] The specific technical solutions of the present invention are as follows:

[0016] A high-temperature and high-pressure pipeline fitting, comprising a thermal insulation layer, a connecting spring, an external pipeline and an internal pipeline;

[0017] A connecting spring is arranged on the inner wall of the inner pipe, a heat-insulating layer is arranged outside the inner pipe, and an outer pipe is arranged outside the heat-insulating layer.

[0018] Preferably, a method for processing and manufacturing high-temperature and high-pressure pipeline fittings comprises the following steps:

[0019] Step S1: Processing the internal pipeline;

[0020] Step S2: processing the thermal insulation layer;

[0021] Step S3: processing the external pipeline;

[0022] Step S4: assembling the insulation layer and the internal pipe;

[0023] Step S5: Butt-join and install the insulation layer, connecting springs, internal pipes and external pipes.

[0024] Preferably, step S1 specifically includes:

[0025] Use a plate that is cut to a size that is three times larger than the pipe diameter, and roll it up for the first time. After rolling, measure the inner wall to see if the diameter of the roll meets the required size. If it does, weld the first circle, perform NDT, and wait for it to pass.

[0026] Preferably, the internal pipeline adopts a coiled pipe method.

[0027] Preferably, step S2 specifically includes:

[0028] Use a laminator to compress the insulation material to form a plate. Then chamfer the corners at both ends of the insulation board to ensure that the insulation board and the steel plate fit perfectly when welded.

[0029] Preferably, the external pipeline adopts a commercially available high-pressure pipeline.

[0030] Preferably, step S4 is specifically:

[0031] Place the insulation material on the remaining sheets and continue to roll them together twice, then fix the rolls by spot welding.

[0032] Preferably, step S5 includes the following sub-steps:

[0033] Sub-step S51: Since the inner pipe and the insulation layer have been welded and finalized, the outer pipe is directly assembled, the outer pipe is polished smooth, and is put on the outside of the inner pipe;

[0034] Sub-step S52: first install it to the spot welding fixed position, then cut off the spot welding points of the internal pipe and the insulation layer, so that the internal pipe can expand inside the external pipe, so that the insulation layer and the inner wall of the external pipe can be perfectly squeezed to improve its thermal insulation performance, and can also absorb the expansion deformation of the internal pipe;

[0035] Sub-step S53: Continue to assemble the inner pipe and the outer pipe until the inner edge is aligned with the outer edge of the outer pipe.

[0036] Preferably, step S6 includes the following sub-steps:

[0037] Sub-step S61: using the inner wall opening of the internal pipe to install a connecting spring 1-3 mm smaller than the opening diameter, inserting 10-20 cm on both sides;

[0038] Sub-step S62: weld one end of the pipe mouth to the connecting spring by welding, and then weld the other end to the connecting spring by welding. The gaps of the two internal pipes must be matched and then welded directly by electric welding to complete the flaw detection;

[0039] Sub-step S63: directly weld the external pipelines, perform insulation and anti-corrosion treatment on the joints, and complete the installation and docking.

[0040] The technical effects of the high-temperature and high-pressure pipeline fittings and the processing and manufacturing method thereof of the present invention are as follows:

[0041] 1. The present invention solves the problems of large volume, difficult transportation, high cost and high difficulty of operation of high-pressure and high-temperature pipelines.

[0042] 2. The present invention solves the problems existing in the installation and construction of high-temperature and high-pressure pipelines, such as high safety accidents, great potential safety hazards, and the difficulty in controlling harm to the human body.

[0043] 3. The present invention changes the loss of hardness and plasticity of the pipeline material caused by high temperature and high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 This is a diagram of a high-temperature and high-pressure pipeline fitting according to the present invention.

[0045] Figure 2 This is a diagram of the internal pipeline body of the present invention.

[0046] Figure 3 It is a heat preservation schematic diagram of the present invention.

[0047] Figure 4 This is an external pipeline diagram of the present invention.

[0048] Figure 5 It is the insulation and inner wall assembly diagram of the present invention.

[0049] Figure 6 It is an assembly diagram of the external pipeline and the internal pipeline of the present invention.

[0050] Figure 7 FIG. 2 is a diagram of a connecting spring according to the present invention.

[0051] Figure 8 This is the installation docking diagram of the pipeline of the present invention.

[0052] Figure numerals: 1 - insulation layer, 2 - connecting spring, 3 - external pipe, 4 - internal pipe. DETAILED DESCRIPTION

[0053] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0054] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0055] A high-temperature and high-pressure pipeline fitting, comprising a thermal insulation layer, a connecting spring, an external pipeline and an internal pipeline;

[0056] A connecting spring is arranged on the inner wall of the inner pipe, a heat-insulating layer is arranged outside the inner pipe, and an outer pipe is arranged outside the heat-insulating layer.

[0057] A method for processing and manufacturing high-temperature and high-pressure pipeline fittings comprises the following steps:

[0058] Step S1: Processing the internal pipeline;

[0059] Step S2: processing the thermal insulation layer;

[0060] Step S3: processing the external pipeline;

[0061] Step S4: assembling the insulation layer and the internal pipe;

[0062] Step S5: Butt-join and install the insulation layer, connecting springs, internal pipes and external pipes.

[0063] Step S1 of this embodiment is specifically as follows:

[0064] Use a plate that is cut to a size that is three times larger than the pipe diameter, and roll it up for the first time. After rolling, measure the inner wall to see if the diameter of the roll meets the required size. If it does, weld the first circle, perform NDT, and wait for it to pass.

[0065] The internal pipeline of this embodiment adopts the coiled pipe method.

[0066] Step S2 of this embodiment is specifically as follows:

[0067] Use a laminator to compress the insulation material to form a plate. Then chamfer the corners at both ends of the insulation board to ensure that the insulation board and the steel plate fit perfectly when welded.

[0068] The external pipeline of this embodiment adopts the finished high-pressure pipeline on the market.

[0069] Step S4 of this embodiment is specifically as follows:

[0070] Place the insulation material on the remaining sheets and continue to roll them together twice, then fix the rolls by spot welding.

[0071] Step S5 of this embodiment includes the following sub-steps:

[0072] Sub-step S51: Since the inner pipe and the insulation layer have been welded and finalized, the outer pipe is directly assembled, the outer pipe is polished smooth, and is put on the outside of the inner pipe;

[0073] Sub-step S52: first install it to the spot welding fixed position, then cut off the spot welding points of the internal pipe and the insulation layer, so that the internal pipe can expand inside the external pipe, so that the insulation layer and the inner wall of the external pipe can be perfectly squeezed to improve its thermal insulation performance, and can also absorb the expansion deformation of the internal pipe;

[0074] Sub-step S53: Continue to assemble the inner pipe and the outer pipe until the inner edge is aligned with the outer edge of the outer pipe.

[0075] Step S6 of this embodiment includes the following sub-steps:

[0076] Sub-step S61: using the inner wall opening of the internal pipe to install a connecting spring 1-3 mm smaller than the opening diameter, inserting 10-20 cm on both sides;

[0077] Sub-step S62: weld one end of the pipe mouth to the connecting spring by welding, and then weld the other end to the connecting spring by welding. The gaps of the two internal pipes must be matched and then welded directly by electric welding to complete the flaw detection;

[0078] Sub-step S63: directly weld the external pipelines, perform insulation and anti-corrosion treatment on the joints, and complete the installation and docking.

[0079] When this implementation plan is implemented,

[0080] The present invention aims to solve the problems in the prior art of reducing the rigidity of the pipeline due to high temperature and high pressure, resulting in large pipeline volume, high working condition risk, high transportation cost and low installation plasticity.

[0081] The present invention selects to use an inner pipe insulation layer, and uses the insulation layer to cool down the temperature to lower the temperature. When it is finally transferred to the outer wall of the pipe, the temperature is directly exchanged with the atmosphere through the external pipe leakage. In this way, the temperature of the external pipe will not be affected when the temperature is increased. This changes the condition of the pipe and solves the risk of reduced pipe hardness.

[0082] In order to compensate for the hardness loss of the pipeline caused by high temperature and high pressure, the present invention adopts an inner pipeline insulation layer. The temperature is reduced layer by layer by utilizing the insulation layer. When the temperature is finally transferred to the outer wall of the pipeline, the temperature is directly exchanged with the atmosphere through the external pipeline leakage. In this way, the temperature of the external pipeline will not be affected when the temperature is increased. This changes the condition of the pipeline and solves the risk of reduced pipeline hardness.

[0083] The structure of the present invention (high temperature and high pressure pipeline) is as follows Figure 1 As shown, it is composed of an internal pipe body 1, a heat preservation material 2, a joint material 3, an external pipe 4, and an internal pipe. The present invention utilizes the internal pipe to withstand high temperature and high pressure, and then combines the internal pipe and the heat preservation material to roll together to form a high temperature and high pressure heat preservation pipe to achieve the purpose of isolating high temperature. At the same time, this structure can also absorb the hard force deformation of the high temperature pipe. The production plan is as follows:

[0084] 1) Internal pipe processing: The internal pipe adopts the pipe rolling method. First, cut the plate three times larger than the pipe diameter, roll the first circle, and measure the inner wall to see if the roll diameter meets the required size. If it meets the requirements, weld the first circle, perform flaw detection, and pass the test. Figure 2 Internal pipe body.

[0085] 2) Insulation processing: Use a laminating machine to compress the insulation material to form a plate, and then chamfer the ends of the insulation board to ensure that the insulation board and the steel plate can fit perfectly when welded. After completion, the next process can be carried out. Figure 3 Insulation diagram.

[0086] 3) External pipeline: The external pipeline can be a finished high-pressure pipeline on the market. Figure 4 External Pipe

[0087] 4) Insulation and inner wall assembly: Place the insulation material on the remaining plates and continue to roll them together twice, then fix the coils by spot welding. Figure 5 shown.

[0088] 5) Assembly of external and internal pipes: Since the internal pipes and the insulation layer have been welded and shaped, the external pipes are assembled directly. The external pipes are polished and smooth, and then they are put on the outside of the internal pipes. They are first installed in the spot welding fixed position, and then the spot welding points of the internal pipes and the insulation layer are cut off, so that the internal pipes can expand inside the external pipes. This allows the insulation layer and the inner wall of the external pipe to be perfectly squeezed to improve its thermal insulation performance, and can also absorb the expansion deformation of the internal pipes. Then continue to assemble the internal and external pipes until the inner edge is aligned with the outer edge of the external pipe. Figure 6 shown.

[0089] 6) Installation and docking of this type of pipeline: Use the inner wall of the internal pipeline to install a spring that is 1-3mm smaller than the diameter, insert 10-20cm on both sides, weld a section of the pipe mouth and the connector, and then connect the other end in the same way. The gaps of the two internal pipelines must be matched and then welded directly by electric welding to complete the flaw detection, and then directly weld the external pipeline, do a good job of insulation and anti-corrosion treatment at the joint, and the installation and docking is completed. Figure 8 shown.

[0090] Key technical points and points to be protected of the present invention

[0091] The rolled inner tube wall insulation can better reduce temperature loss and layered insulation to reduce high temperature and avoid deformation and reduction of hardness of the material caused by high temperature. It can better exert the hardness and performance of the material and has good pressure-bearing technology.

[0092] The internal rolled plate is used to make the insulation plate and the inner wall of the outer pipe fit perfectly.

[0093] Using the expansion pressure of the internal pipes to enhance the firmness of the insulation board can provide better insulation performance.

[0094] Technology that can transmit the force of the inner pipe's expansion to the outer pipe.

[0095] A technology that uses internal pipes to withstand high pressure and uses insulation panels to isolate or lower the temperature, allowing conventional pipes to withstand high pressure.

[0096] The connection spring is used to buffer the expansion force of the pipe connection.

Claims

1. A high temperature and high pressure pipeline fitting, characterized in that: It comprises a heat-insulating layer (1), a connecting spring (2), an external pipe (3) and an internal pipe (4); A connecting spring (2) is arranged on the inner wall of the internal pipe (3), a heat-insulating layer (1) is arranged outside the internal pipe (3), and an external pipe (4) is arranged outside the heat-insulating layer.

2. A method for processing and manufacturing high-temperature and high-pressure pipeline fittings, characterized in that: The following steps are involved: Step S1: Processing the internal pipeline; Step S2: processing the insulation layer; Step S3: processing the external pipeline; Step S4: assembling the insulation layer and the internal pipe; Step S5: Butt-join and install the insulation layer, connecting springs, internal pipes and external pipes.

3. The method for manufacturing high-temperature and high-pressure pipeline fittings according to claim 2, characterized in that: The step S1 is specifically as follows: Use a plate that is cut to a size that is three times larger than the pipe diameter, and roll it up for the first time. After rolling, measure the inner wall to see if the diameter of the roll meets the required size. If it does, weld the first circle, perform NDT, and wait for it to pass.

4. The method for manufacturing high-temperature and high-pressure pipeline fittings according to claim 2, characterized in that: The internal pipeline adopts the method of coiled pipe.

5. The method for manufacturing high-temperature and high-pressure pipeline fittings according to claim 2, characterized in that: The step S2 is specifically as follows: Use a laminator to compress the insulation material to form a plate. Then chamfer the corners at both ends of the insulation board to ensure that the insulation board and the steel plate fit perfectly when welded.

6. The method for manufacturing high-temperature and high-pressure pipeline fittings according to claim 2, characterized in that: The external pipeline adopts a finished high-pressure pipeline on the market.

7. The method for manufacturing high-temperature and high-pressure pipeline fittings according to claim 2, characterized in that: The step S4 is specifically as follows: Place the insulation material on the remaining sheets and continue to roll them together twice, then fix the rolls by spot welding.

8. The method for manufacturing high-temperature and high-pressure pipeline fittings according to claim 2, characterized in that: The step S5 comprises the following sub-steps: Sub-step S51: Since the inner pipe and the insulation layer have been welded and finalized, the outer pipe is directly assembled, the outer pipe is polished smooth, and is put on the outside of the inner pipe; Sub-step S52: first install it to the spot welding fixed position, then cut off the spot welding points of the internal pipe and the insulation layer, so that the internal pipe can expand inside the external pipe, so that the insulation layer and the inner wall of the external pipe can be perfectly squeezed to improve its thermal insulation performance, and can also absorb the expansion deformation of the internal pipe; Sub-step S53: Continue to assemble the inner pipe and the outer pipe until the inner edge is aligned with the outer edge of the outer pipe.

9. The method for manufacturing high-temperature and high-pressure pipeline fittings according to claim 2, characterized in that: The step S6 comprises the following sub-steps: Sub-step S61: using the inner wall opening of the internal pipe to install a connecting spring 1-3 mm smaller than the opening diameter, inserting 10-20 cm on both sides; Sub-step S62: weld one end of the pipe mouth to the connecting spring by welding, and then weld the other end to the connecting spring by welding. The gaps of the two internal pipes must be matched and then welded directly by electric welding to complete the flaw detection; Sub-step S63: directly weld the external pipelines, perform insulation and anti-corrosion treatment on the joints, and complete the installation and docking.

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