Method and closure for sealing a pressurized pipe during welding

Abstract

The application provides a steam and water blocking method and a blocking piece for pressure pipeline welding. The steam and water blocking method for pressure pipeline welding comprises the following steps: S110, determining the inner diameter of the pressure pipeline and a position to be blocked, and manufacturing a blocking piece according to the inner diameter of the pressure pipeline; S120, closing a valve of the pressure pipeline to avoid steam and water from continuously entering the pressure pipeline; S130, inserting the blocking piece into the position to be blocked in the pressure pipeline to completely block the inside of the pressure pipeline and avoid steam and water from leaking to the welding position; S140, determining whether the blocking piece completely blocks the pressure pipeline, and starting welding if the pressure pipeline is completely blocked; wherein the material of the blocking piece is composed of millet, montmorillonite and toilet paper. The application solves the problem that steam and water cannot be completely isolated in the process of pipeline welding in the prior art, which leads to welding defects.

Description

Technical Field

[0001] This invention relates to the field of pressure pipeline equipment technology, and more specifically, to a method and sealing component for sealing steam and water in pressure pipeline welding. Background Technology

[0002] In the maintenance of steam and water pressure pipelines, welding is usually required to repair leaks in order to ensure the integrity of the entire pipeline and prevent leaks during use.

[0003] However, in the welding process, the tightness of valves in the steam and water pressure pipeline system is often not ideal. Small leaks at the valves can cause steam and water to reach the weld joint, causing inconvenience to the welding process. In particular, the weld joints of high-pressure steam and water pressure pipelines in thermal power plants are all monitored weld joints. Steam and water interference is not allowed during the welding process of pressure pipelines. Steam and water can easily cause welding defects such as porosity at the weld joint. Welding defects will reduce the plasticity and increase the hardness of the pressure pipeline. At the same time, the metal structure of the pressure pipeline will also change, and it will not meet the technical requirements of high-pressure monitored weld joints.

[0004] In other words, in the existing technology, it is not easy to completely separate the steam and water during the welding process of steam and water pipes, which leads to welding defects. In addition, the sealing parts are not easy to remove after welding, which can easily cause the steam and water pipes to become blocked and unusable. Summary of the Invention

[0005] The main objective of this invention is to provide a method and sealing component for sealing steam and water during the welding of pressure pipelines, so as to solve the problem that it is not easy to completely isolate steam and water during the welding process of steam and water pipelines in the prior art, which leads to welding defects.

[0006] To achieve the above objectives, according to one aspect of the present invention, a method for sealing steam and water in a pressure pipeline is provided, comprising: step S110: determining the inner diameter of the pressure pipeline and the location to be sealed, and fabricating a sealing element according to the inner diameter of the pressure pipeline; step S120: closing the valve of the pressure pipeline to prevent steam and water from continuing to flow into the pressure pipeline; step S130: inserting the sealing element into the location to be sealed in the pressure pipeline to completely seal the inside of the pressure pipeline and prevent steam and water from leaking to the weld; step S140: determining whether the sealing element completely seals the pressure pipeline, and if the pressure pipeline is completely sealed, then welding begins; wherein the material of the sealing element is composed of oat flour, montmorillonite, and toilet paper.

[0007] Furthermore, step S110 also includes unfolding the roll of toilet paper to a flat state; mixing the flakes and montmorillonite in a volume ratio of 2:1 to form a mixture; evenly spreading the mixture on the flat toilet paper to form a mixture layer; and rolling up the toilet paper and the mixture layer to form a sealing element.

[0008] Furthermore, during the process of rolling up the toilet paper and the mixture layer to form a sealing element, the mixture layer is tightly bound to the toilet paper.

[0009] Furthermore, during the process of rolling up the toilet paper and mixture layer to form a sealing element, the toilet paper and mixture layer is rolled into a cylinder with the same diameter as the inner diameter of the pressure pipe.

[0010] Furthermore, before mixing the rice flour and montmorillonite in a 2:1 volume ratio to form a mixture, the rice flour is heated and roasted until golden brown.

[0011] Furthermore, during the process of evenly spreading the mixture onto a flat piece of toilet paper to form a mixture layer, the thickness of the mixture layer is the same as the thickness of the toilet paper.

[0012] Furthermore, in step S130, during the process of inserting the sealing element into the pressure pipe at the location to be sealed: the position of the weld joint is determined; the sealing element is inserted into the pressure pipe at a position 15 cm to 20 cm away from the weld joint.

[0013] Furthermore, after step S140, the procedure also includes: after welding is completed, a qualification inspection is performed on the weld joint; if the weld joint is qualified, the valve of the pressure pipeline is opened, and a large amount of steam and water flowing into the pressure pipeline decomposes the sealing component.

[0014] According to another aspect of the present invention, a sealing element is provided for use in the above-described method for sealing steam and water in pressure pipeline welding. The sealing element comprises: a toilet paper layer; a mixture layer, wherein the mixture layer is laid on the toilet paper layer and the thickness of the mixture layer is the same as the thickness of the toilet paper layer, the material of the mixture layer is composed of flaky flour and montmorillonite, and the toilet paper layer and the mixture layer are rolled into a cylindrical structure.

[0015] Furthermore, the volume ratio of succinate to montmorillonite is 2:1.

[0016] The method for sealing steam and water in pressure pipeline welding using the technical solution of this invention includes: Step S110: Determining the inner diameter of the pressure pipeline and the location to be sealed, and making a sealing component according to the inner diameter of the pressure pipeline; Step S120: Closing the valve of the pressure pipeline to prevent steam and water from continuing to flow into the pressure pipeline; Step S130: Inserting the sealing component into the location to be sealed in the pressure pipeline to completely seal the inside of the pressure pipeline and prevent steam and water from leaking to the welding point; Step S140: Determining whether the sealing component completely seals the pressure pipeline, and if the pressure pipeline is completely sealed, then welding begins; wherein, the material of the sealing component is composed of oat flour, montmorillonite, and toilet paper.

[0017] Based on the inner diameter of the pressure pipe, determine the outer diameter of the sealing element to ensure it can effectively seal the pipe. Close the valve on the pressure pipe to prevent further flow of steam and water, thus avoiding interference with subsequent welding. Since toilet paper and oat noodles absorb water to more than double their original volume, and montmorillonite expands several to ten times its original volume after absorbing water, the sealing element absorbs any remaining steam and water after the valve is closed. Simultaneously, the expansion of the sealing element further enhances the seal between it and the pressure pipe, ensuring no steam or water remains in the pipe during welding, effectively preventing its impact and improving weld quality. Furthermore, toilet paper possesses sufficient strength to prevent the sealing element from melting when exposed to small amounts of steam and water. In other words, after closing the valve, any remaining steam and water in the pressure pipe will only cause the sealing element to expand, not melt. Since oat noodles, montmorillonite, and toilet paper are all easily melted when exposed to large amounts of steam, after welding is completed and the weld joint passes inspection, opening the valve of the pressure pipeline will cause the welded parts to melt upon encountering a large amount of steam. The melted sealing parts will not have any side effects on the pressure pipeline or accessories within the system, nor will they affect the operation of the pressure pipeline. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0019] Figure 1 A flowchart of a steam-water sealing method for welding pressure pipelines according to an optional embodiment of the present invention is shown. Detailed Implementation

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0023] To address the problem of welding defects caused by the difficulty in completely isolating steam and water during the welding process of steam-water pipelines in the prior art, this invention provides a steam-water sealing method and sealing component for pressure pipeline welding.

[0024] like Figure 1 As shown, the method for sealing steam and water in a pressure pipeline includes: Step S110: Determine the inner diameter of the pressure pipeline and the location to be sealed, and make a sealing component according to the inner diameter of the pressure pipeline; Step S120: Close the valve of the pressure pipeline to prevent steam and water from continuing to flow into the pressure pipeline; Step S130: Insert the sealing component into the location to be sealed in the pressure pipeline to completely seal the inside of the pressure pipeline and prevent steam and water from leaking to the welding point; Step S140: Determine whether the sealing component completely seals the pressure pipeline. If the pressure pipeline is completely sealed, welding begins; wherein, the material of the sealing component is composed of oat flour, montmorillonite, and toilet paper.

[0025] Based on the inner diameter of the pressure pipe, determine the outer diameter of the sealing element to ensure it can effectively seal the pipe. Close the valve on the pressure pipe to prevent further flow of steam and water, thus avoiding interference with subsequent welding. Since toilet paper and oat noodles absorb water to more than double their original volume, and montmorillonite expands several to ten times its original volume after absorbing water, the sealing element absorbs any remaining steam and water after the valve is closed. Simultaneously, the expansion of the sealing element further enhances the seal between it and the pressure pipe, ensuring no steam or water remains in the pipe during welding, effectively preventing its impact and improving weld quality. Furthermore, toilet paper possesses sufficient strength to prevent the sealing element from melting when exposed to small amounts of steam and water. In other words, after closing the valve, any remaining steam and water in the pressure pipe will only cause the sealing element to expand, not melt. Since oat noodles, montmorillonite, and toilet paper are all easily melted when exposed to large amounts of steam, after welding is completed and the weld joint passes inspection, opening the valve of the pressure pipeline will cause the welded parts to melt upon encountering a large amount of steam. The melted sealing parts will not have any side effects on the pressure pipeline or accessories within the system, nor will they affect the operation of the pressure pipeline.

[0026] After confirming that the sealing component completely seals the pressure pipeline, welding is performed on the weld joint. At this time, steam and water will not reach the weld joint, as the sealing component completely absorbs the steam and water in the pressure pipeline. The welding at the weld joint will not be affected, and the weld joint is a qualified weld joint.

[0027] Specifically, step S110 further includes unfolding the roll of toilet paper to a flat state; mixing styrene and montmorillonite in a 2:1 volume ratio to form a mixture; evenly spreading the mixture on the flat toilet paper to form a mixture layer; and rolling up the toilet paper and mixture layer to form a sealing component. Mixing styrene and montmorillonite in a 2:1 volume ratio and evenly spreading it on the flat toilet paper to form a mixture layer ensures that the sealing component has good absorption and expansion properties for small amounts of soda while also maintaining its structural strength, preventing the sealing component from melting upon contact with a small amount of soda.

[0028] Specifically, during the process of rolling up the toilet paper and the mixture layer to form the sealing component, the mixture layer is tightly bound to the toilet paper. This arrangement helps to ensure the structural strength of the sealing component.

[0029] Specifically, in the process of rolling up the toilet paper and mixture layer to form the sealing element, the toilet paper and mixture layer are rolled into a cylinder with the same diameter as the inner diameter of the pressure pipe. The resulting sealing element has a cylindrical structure, which facilitates its insertion into the pressure pipe. At the same time, the cylindrical shape of the sealing element conforms to the shape of the pipe, enabling it to completely seal the pressure pipe and prevent steam and water leakage. The sealing element has the same diameter as the pressure pipe.

[0030] Specifically, before mixing the flour and montmorillonite in a 2:1 volume ratio to form a mixture, the flour is heated and roasted until yellow. This is more conducive to improving the overall water absorption and expansion of the sealing component.

[0031] Specifically, both maltose and montmorillonite are in powder form.

[0032] Specifically, during the process of evenly spreading the mixture onto a flat sheet of toilet paper to form a mixture layer, the thickness of the mixture layer is the same as the thickness of the toilet paper. This arrangement makes it easier to roll the toilet paper and the mixture together, allowing the mixture to be easily sandwiched between the toilet paper layers, preventing separation. Furthermore, it ensures a suitable volume ratio between the mixture and the toilet paper, resulting in good water absorption and expansion of the sealing component at this volume ratio.

[0033] Specifically, in step S130, during the process of inserting the sealing element into the pressure pipe at the location to be sealed: the position of the weld joint is determined; the sealing element is inserted into the pressure pipe at a distance of 15 to 20 centimeters from the weld joint. If the sealing element is too close to the weld joint, the sealing material will be burned during welding. Furthermore, this arrangement ensures that any condensation at the weld joint is absorbed by the sealing element, preventing condensation from obstructing the weld joint and facilitating welding.

[0034] The length of the sealing component is determined by the amount of water and gas stored in the pressure pipeline. If the amount of water or gas is too large, the length of the sealing component is the same as the diameter of the pressure pipeline; otherwise, the length is reduced.

[0035] Specifically, after step S140, the procedure further includes: after welding is completed, a qualification inspection is performed on the weld joint; if the weld joint is qualified, the valve of the pressure pipeline is opened, and a large amount of steam and water flowing into the pressure pipeline decomposes the sealing component. After the valve of the pressure pipeline is opened, the sealing component absorbs the steam and water in the pressure pipeline. After absorbing a large amount of steam and water, the sealing component gradually melts, thus not affecting the pressure pipeline after welding.

[0036] It should be noted that once the valve in the pressure pipeline is opened, the steam and water will be continuously absorbed by the sealing component inside the pressure pipeline until the sealing component melts. Therefore, there is no specific limit on the amount of steam and water. As long as steam and water are continuously introduced, the sealing component will be decomposed sooner or later; it's just a matter of time.

[0037] In an optional embodiment, the sealing element used in the above-described method for sealing steam and water in pressure pipeline welding includes: a toilet paper layer; a mixture layer, wherein the mixture layer is laid on the toilet paper layer and the thickness of the mixture layer is the same as that of the toilet paper layer, the material of the mixture layer is composed of flaky and montmorillonite, and the toilet paper layer and the mixture layer are rolled into a cylindrical structure.

[0038] Specifically, the volume ratio of flour to montmorillonite is 2:1. Flour and montmorillonite are evenly mixed in a 2:1 volume ratio and then spread on top of the toilet paper layer. Using this volume ratio of flour and montmorillonite with toilet paper results in better absorbency and expansion.

[0039] The sealing component in this application is composed of oat flour, montmorillonite, and toilet paper. It is placed inside the pressure pipeline during welding. The toilet paper, oat flour, and montmorillonite all have water-absorbing properties. When some of the steam and water inside the pressure pipeline comes into contact with the sealing component, it will be completely absorbed by the sealing component. Moreover, the toilet paper, oat flour, and montmorillonite all have expansion properties. When absorbing steam and water, they can also expand, making the sealing inside the pressure pipeline more tight, preventing steam and water from leaking to the welding point and affecting the welding. This ensures that the pressure pipeline is not disturbed by steam and water during the welding process, and avoids the generation of welding defects.

[0040] Moreover, the materials used in the sealing components of this application, such as oat flour, montmorillonite, and toilet paper, are all common materials that are low in cost and easy to purchase.

[0041] In practice, during the welding operation of the pressure pipeline, the valve of the pressure pipeline is closed, and some steam (water vapor) may remain inside the pressure pipeline. This small amount of steam is absorbed by the sealing component, and the sealing component expands after absorbing a small amount of steam. The expanded sealing component provides a better seal for the pressure pipeline, effectively isolating the steam from the weld joint. After the pressure pipeline welding is completed, the valve of the pressure pipeline is opened. At this time, a large amount of steam comes into contact with the sealing component. Since the sealing component is easily soluble in water, the large amount of steam can melt or decompose the sealing component. After the sealing component decomposes inside the pressure pipeline, it will not have an adverse effect on the future use of the pressure pipeline. Therefore, it is not necessary to remove the sealing component from the pressure pipeline after welding, which can improve the overall work efficiency and has extremely high applicability.

[0042] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0043] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0044] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for sealing steam and water in a pressure pipeline by welding, characterized in that, include: Step S110: Determine the inner diameter of the pressure pipeline and the location to be sealed, and manufacture the sealing component according to the inner diameter of the pressure pipeline; Step S120: Close the valve of the pressure pipeline to prevent steam and water from continuing to flow into the pressure pipeline; Step S130: Insert the sealing component into the pressure pipe at the location to be sealed, completely sealing the inside of the pressure pipe to prevent steam and water from leaking to the weld. Step S140: Determine whether the sealing component completely seals the pressure pipe. If the pressure pipe is completely sealed, begin welding. The sealing component is made of oat flour, montmorillonite, and toilet paper. Step S110 further includes: Unroll the roll of toilet paper until it is flat; Mix flour and montmorillonite in a volume ratio of 2:1 to form a mixture; The mixture is evenly spread on the toilet paper in a flat state to form a mixture layer; The toilet paper and the mixture layer are rolled up to form the sealing element.

2. The method for sealing steam and water in pressure pipeline welding according to claim 1, characterized in that, During the process of rolling up the toilet paper and the mixture layer to form the sealing member, the mixture layer is tightly bound to the toilet paper.

3. The method for sealing steam and water in pressure pipeline welding according to claim 1, characterized in that, During the process of rolling up the toilet paper and the mixture layer to form the sealing element, the toilet paper and the mixture layer are rolled into a cylinder with the same diameter as the inner diameter of the pressure pipe.

4. The method for sealing steam and water in pressure pipeline welding according to claim 1, characterized in that, Before mixing the flour and montmorillonite in a 2:1 volume ratio to form a mixture, the flour is heated and roasted until golden brown.

5. The method for sealing steam and water in pressure pipeline welding according to claim 1, characterized in that, During the process of evenly spreading the mixture onto the flat toilet paper to form a mixture layer, the thickness of the mixture layer is the same as the thickness of the toilet paper.

6. The method for sealing steam and water in pressure pipeline welding according to any one of claims 1 to 5, characterized in that, During step S130, when the sealing element is inserted into the pressure pipe at the location to be sealed: Determine the location of the weld joint; The sealing element is inserted into the pressure pipe at a distance of 15 to 20 centimeters from the weld joint.

7. The method for sealing steam and water in pressure pipeline welding according to any one of claims 1 to 5, characterized in that, The process further includes the following after step S140: After welding is completed, the weld joint is inspected for conformity. If the weld is a qualified weld, the valve of the pressure pipeline is opened, and a large amount of steam and water flowing into the pressure pipeline will decompose the sealing component.

8. A sealing component, characterized in that, The sealing element is used in the steam-water sealing method for pressure pipeline welding according to any one of claims 1 to 7, the sealing element comprising: Toilet paper layer; A mixture layer is laid on the toilet paper layer, and the thickness of the mixture layer is the same as that of the toilet paper layer. The mixture layer is made of flocculent and montmorillonite, and the toilet paper layer and the mixture layer are rolled into a cylindrical structure.

9. The sealing component according to claim 8, characterized in that, The volume ratio of the zeolite to the montmorillonite is 2:1.

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