Composite film for corrosion prevention of urban gas piping welding parts

Abstract

The present invention relates to a composite film for preventing corrosion in the welded portion of a city gas pipeline. The purpose of the invention is to provide a composite film that can prevent gas leakage accidents caused by the thinning of the gas pipeline and the progression of cracks due to corrosion in the welded portion by forming a dehumidifying portion and a rust-preventing portion on the inner side of an elastic film that elastically and easily seals the welded portion of a metal gas pipeline, thereby preventing the metal gas pipeline from being exposed to oxygen and moisture and fundamentally blocking corrosion. The present invention is characterized by a composite film for preventing corrosion of a welded part of a city gas pipe, comprising: an elastic film (1) that seals the welded connection section between a synthetic resin joint pipe fused to a synthetic resin gas pipe exposed above ground among city gas pipes and a metal gas pipe at the top of the synthetic resin joint pipe by adhering to it; a dehumidifying part (2) formed on the inner surface of the sealed elastic film (1) that removes moisture present in the sealed space and provides a buffering force; and a rust-preventing part (3) formed on the inner surface of the sealed elastic film (1) that prevents oxygen penetration by forming a film on the metal gas pipe through the sublimation action of the material, wherein one of the dehumidifying part (2) or the rust-preventing part (3) is selected to form a primary layer on the inner surface of the elastic film (1), and the other is laminated to form a secondary layer.

Description

Technology Field

[0001] The present invention relates to a composite film for preventing corrosion of welded joints in city gas pipelines, and more specifically, to a composite film that can fundamentally prevent corrosion of welded joints in city gas pipelines by being easily installed around the welded joints of city gas pipelines to seal a certain section above and below the welded joint, thereby blocking the inflow of oxygen and moisture from the outside into the welded area, absorbing moisture present in the sealed space, and simultaneously forming a corrosion-preventing protective film on the surface of the metal pipe at the welded joint. Background Technology

[0002] City gas is used for heating or cooking in various buildings such as houses, villas, apartments, and office buildings.

[0003] City gas is typically supplied through gas pipelines buried underground, and these pipelines are classified according to their material into conductive steel pipelines and non-conductive synthetic resin pipelines. Polyethylene (PE) is commonly used for non-conductive synthetic resin pipelines.

[0004] Among the aforementioned gas pipelines, metal gas pipelines are typically used in areas with high gas pressure, such as those constructed near consumer buildings or buried underground.

[0005] In addition, synthetic resin gas pipes are used in areas where the gas pressure supplied to general consumers is low.

[0006] Therefore, since city gas used by general consumers, such as in villas, detached houses, and apartments, all utilizes low pressure, it is typically connected to metal gas pipes when supplying gas to each household above ground after the synthetic resin gas pipes are buried.

[0007] When the above-mentioned synthetic resin gas pipe is connected to a metal gas pipe, it is connected by a heterogeneous joint in which the lower part is formed of the synthetic resin gas pipe and the upper part is composed of the metal pipe.

[0008] At this time, the synthetic resin gas pipe located at the bottom of the above-mentioned dissimilar joint pipe is connected by heat fusion, and the metal gas pipe at the top of the above-mentioned dissimilar joint pipe is connected by welding.

[0009] Through this connection structure, city gas is supplied stably.

[0010] However, the aforementioned welded connection has the disadvantage that the weld bead is formed thicker than the pipe thickness, and due to the influence of welding heat, there are many irregularities on the surface, resulting in uneven paint film thickness and reduced durability of the film even when paint is applied after welding.

[0011] Figures 6 and 7 are photographs showing rust forming on the welded portion of a conventional metal pipe.

[0012] As described, condensation occurs around the welds of metal pipes due to temperature differences, and repeated contraction and expansion damage the paint film, leading to frequent rust formation around the welds.

[0013] There is a structural problem in that as rust progresses, the metal pipe at the welded part thins and cracks spread, causing gas to leak to the outside, resulting in safety accidents. Prior art literature

[0014] Korean Registered Patent Publication No. 10-1004088 (Dec. 20, 2010) Korean Registered Patent Publication No. 10-0515919 (September 12, 2005) Korean Published Patent Publication No. 10-1997-0033830 (July 22, 1997) Korean Published Patent Publication No. 10-2014-0134882 (November 25, 2014) The problem to be solved

[0015] The objective of the present invention to solve the above-mentioned problems is to provide a composite film that can prevent gas leakage accidents caused by the thinning of the gas pipe and the progression of cracks due to corrosion at the welded area by forming a dehumidifying section and a rust-preventing section on the inner side of an elastic film that elastically and easily seals the welded area of ​​a metal gas pipe, thereby preventing the metal gas pipe from being exposed to oxygen and moisture and fundamentally blocking corrosion. means of solving the problem

[0016] The present invention, which performs the task of achieving the above-mentioned purpose and eliminating conventional defects, comprises: an elastic film that seals by tightly adhering to the welded connection section between a heterogeneous joint pipe fused to a synthetic resin gas pipe exposed above ground among city gas pipelines and a metal gas pipe at the top of the heterogeneous joint pipe;

[0017] A dehumidifying unit formed on the inner surface of a sealed elastic film that provides buffering force while removing moisture present in a sealed space;

[0018] It is composed of a corrosion-preventing part formed on the inner surface of a sealed elastic film to form a film on a metal gas pipe through the sublimation action of the material to prevent oxygen penetration;

[0019] This is achieved by providing a composite film for preventing corrosion of welded parts of city gas pipelines, characterized in that one of the above-mentioned dehumidifying part or anti-corrosion part forms a primary layer on the inner surface of the elastic film, and the other one is laminated to form a secondary layer.

[0020] In a preferred embodiment, the secondary layer, which is selected from either a dehumidifying layer or a rust-preventing layer, is characterized by having a plurality of ventilation holes formed therein to communicate with the remaining rust-preventing layer or dehumidifying layer constituting the primary layer.

[0021] In a preferred embodiment, the dehumidifying unit is characterized by being composed of one or more selected from calcium chloride, silica gel, super absorbent polymer, bentonite, charcoal powder, sulfuric acid, and zeolite that absorb moisture.

[0022] In a preferred embodiment, the anti-corrosion part is characterized by being composed of a volatile corrosion inhibitor (VCI) that blocks oxygen penetration by forming a film through the sublimation of the material on the surface of a metal or an anti-corrosion part.

[0023] In a preferred embodiment, the dehumidifying part and the anti-corrosion part are each formed as a film layer.

[0024] In a preferred embodiment, the composite film is characterized by being multi-sealed by tying the circumference of a gas pipe with a sealing member selected from an elastic cord, a rubber magnet, a mechanical clamp, or a cable tie, at multiple portions of the outer upper, middle, and lower sections of the elastic film. Effects of the invention

[0025] The composite film according to the present invention, having the above-described features, is a useful invention that has the effect of preventing gas leakage through the welded parts of a gas pipe by preventing corrosion at the source through the elastic film formed with multiple dehumidifying and anti-corrosion sections on the inner side of the elastic film that elastically and easily seals the welded parts of a metal gas pipe, thereby preventing the metal gas pipe from being exposed to oxygen and moisture. Therefore, it is an invention that is expected to be widely used in industry. Brief explanation of the drawing

[0026] FIG. 1 is a planar exemplary view showing the structure of an elastic film according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view along line AA of FIG. 1 showing the side structure of an elastic film according to one embodiment of the present invention, and FIG. 3 is a planar exemplary view showing the structure of an elastic film according to another embodiment of the present invention, and FIG. 4 is a cross-sectional view along line AA of FIG. 3 showing the structure of an elastic film according to another embodiment of the present invention, and FIG. 5 is an exemplary diagram showing a structure in which a composite film according to one embodiment of the present invention is installed in a welded portion of a metal gas pipe, and Figures 6 and 7 are photographs showing rust forming on the welded portion of a conventional metal pipe. Specific details for implementing the invention

[0027] The configuration and operation of an embodiment of the present invention will be described in detail below in conjunction with the attached drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0028] FIG. 1 is a planar exemplary diagram showing the structure of an elastic film according to one embodiment of the present invention, FIG. 2 is a cross-sectional view along line AA of FIG. 1 showing the side structure of an elastic film according to one embodiment of the present invention, FIG. 3 is a planar exemplary diagram showing the structure of an elastic film according to another embodiment of the present invention, FIG. 4 is a cross-sectional view along line AA of FIG. 3 showing the structure of an elastic film according to another embodiment of the present invention, and FIG. 5 is an exemplary diagram showing a structure in which a composite film according to one embodiment of the present invention is installed in a welded part of a metal gas pipe.

[0029] As described above, the composite film according to the present invention is a composite film with a 3-layer structure, and is configured such that a dehumidifying part (2) and a rust-preventing part (3) are formed on an elastic film (1).

[0030] At this time, one of the dehumidifying part (2) or the anti-corrosion part (3) selected forms a first layer on the inner surface of the elastic film (1), and the other one is laminated to form a second layer, and a plurality of ventilation holes (4) are arranged and formed in the second layer.

[0031] In one illustrated embodiment, a dehumidifying unit (2) forming a primary layer is connected to the surface of a gas pipe or a weld through a ventilation opening (4) formed in a secondary layer to perform dehumidification, and the secondary layer is configured so that a rust-preventing unit (3) forms a film on the surface of the weld of the gas pipe through sublimation to perform rust prevention.

[0032] In another embodiment, the anti-corrosion part (3) forming the first layer is configured to perform anti-corrosion action by forming a film on the surface of the gas pipe or weld through sublimation via the ventilation hole (4) formed in the second layer, and the dehumidification part (2) of the second layer performs dehumidification action on the gas pipe or weld.

[0033] As described above, if the composite film is composed of a 3-layer structure consisting of an elastic film (1), a dehumidifying part (2), and a rust-preventing part (3), there is an advantage that the manufacturing process is simple.

[0034] Specifically, the elastic film (1) is a film that seals the welded connection section between the synthetic resin gas pipe exposed above ground among the city gas pipes and the metal gas pipe at the top of the synthetic resin gas pipe by fusion connection.

[0035] The material of the elastic film can be any polymer synthetic resin that can provide elasticity while possessing good durability, weather resistance, and antifouling properties.

[0036] The elastic film is a film forming the basic structure of the present invention. By being stretched along the circumference of the welded portion of the gas pipe and wound in an elastic state, the weld bead is formed to be thicker than the thickness of the metal pipe. It adheres closely to the uneven welded portion, where many irregularities are formed on the surface due to the influence of welding heat, thereby preventing the occurrence of gaps.

[0037] When such uneven welded areas are tightly wrapped with an elastic film, oxygen and moisture from the outside are prevented from entering the metal gas pipes or the surface of the weld, thereby preventing corrosion.

[0038] The above elastic film is cut to a length smaller than the circumference of the gas pipe to be attached, and then, during installation, is stretched so that it can be wrapped around the gas pipe about 2 to 3 times while maintaining its elasticity.

[0039] The above number of windings is according to one embodiment, and the present invention does not limit winding to a specific number of times.

[0040] The dehumidification unit (2) is formed on the inner surface of the sealed elastic film (1) and is configured to be in close contact with the metal gas pipe and welded part, and to provide a buffering force while removing residual moisture.

[0041] The dehumidification section (2) can be optionally formed in the first layer or in the second layer.

[0042] The dehumidifying unit (2) is composed of one or more selected from calcium chloride, silica gel, super absorbent polymer, bentonite, charcoal powder, sulfuric acid, and zeolite, and is composed of a component capable of absorbing moisture in the internal area in contact with the metal gas pipe and welded part sealed by the elastic film and maintaining a dry state. For reference, such dehumidifying materials can absorb moisture from the air up to 500 times their own weight and remove surrounding moisture to prevent corrosion (rust) from occurring.

[0043] In addition, the dehumidifying section (2) absorbs moisture and increases in thickness or volume, thereby providing physical cushioning power. As a result, it also serves to protect the gas pipe and welded parts from damage caused by external impact.

[0044] The anti-corrosion part (3) is formed on the inner surface of the sealed elastic film (1) and is in close contact with the metal gas pipe and welded part, and is configured to prevent residual oxygen penetration by forming a film on the metal gas pipe and welded part through sublimation.

[0045] The anti-corrosion part (3) can be optionally formed in the first layer or in the second layer.

[0046] The anti-corrosion part (3) is composed of a volatile corrosion inhibitor, which is a sublimable substance such as naphthalene, to block the penetration of oxygen that corrodes by coming into contact with the metal gas pipe and welded part. The volatile corrosion inhibitor forms a film on the metal surface to block the penetration of oxygen and prevent corrosion.

[0047] The above dehumidification part (2) and rust prevention part (3) can be formed by forming a film layer and attaching it to one side of an elastic film with an adhesive or double-sided tape.

[0048] The ventilation hole (4) can be formed in a circular or polygonal shape.

[0049] It is preferable to form the ventilation holes with a diameter of 50 mm or less, because if they are larger, the area of ​​the ventilation holes increases, and the area of ​​the dehumidifying part (2) or the anti-corrosion part (3) constituting the secondary layer decreases, and the physical properties of the secondary layer formed by the film layer may be weakened.

[0050] In addition, the ventilation holes can be formed with a diameter as small as a micrometer. Even when formed in this way, the airflow is smooth, so it does not interfere with the operation of the dehumidifying part (2) or the anti-corrosion part (3) constituting the primary layer, and the physical properties of the secondary layer are strong, so the film does not tear easily.

[0051] Additionally, when forming the vents by arranging them, they may be formed with a spacing of approximately the diameter of adjacent vents. However, the present invention is sufficient if multiple vents are arranged, and does not limit the specific spacing.

[0053] As shown in FIG. 5, the above composite film is used to seal multiple parts of the elastic film (1) on the outer upper, middle, and lower sides by using a sealing member (5) selected from an elastic cord, a rubber magnet, a mechanical clamp, or a cable tie to seal the welded connection section between the metal gas pipe at the top of the heterogeneous joint pipe and the synthetic resin gas pipe exposed above ground in the city gas pipeline, and the upper and lower parts of the elastic film to seal them in a secondary multi-sealing manner.

[0054] When a sealing member (5) that physically binds in this manner is provided, even if the elasticity of the elastic film decreases over time and the adhesion becomes loose due to reduced elasticity, the seal between the metal gas pipe and the elastic film is maintained, so that the supply of oxygen and gas from the outside is continuously blocked, thereby continuously preventing corrosion of the welded part by the dehumidification part (2) and the anti-corrosion part (3).

[0055] The above composite film is used by cutting it into a trapezoidal shape for the welded joint of a heterogeneous joint pipe as shown in (a) of FIGS. 1 and 3, and by cutting it into a square shape for the welded joint of a general metal gas pipe as shown in (b).

[0056] By providing such a shape, rapid installation becomes possible regardless of whether the pipe to be attached has a uniform diameter or a pipe with varying diameters.

[0057] FIG. 5 is an exemplary diagram showing a structure in which a composite film according to one embodiment of the present invention is installed in a welded part of a metal gas pipe.

[0058] As described above, the elastic film (1) constituting the composite film is stretched and adhered to the section including the area around the weld (721) between the upper metal gas pipe (72) of the synthetic resin gas pipe (71) constituting the heterogeneous joint pipe (7) and the adjacent granular metal gas pipe (72), and the outer upper, middle, and lower portions of the elastic film (1) are secured by a sealing member (5) selected from an elastic cord, a rubber magnet, a mechanical clamp, and a cable tie, thereby providing a sealed state.

[0059] In addition to the embodiment installed in the above-mentioned heterogeneous joint pipe (7), the present invention may also be configured to provide a sealed state by fixing multiple portions of the elastic film (1)—including the outer upper, middle, and lower sections—with a sealing member (5) selected from an elastic cord, a rubber magnet, a mechanical clamp, and a cable tie, while the elastic film (1) constituting the composite film is stretched and adhered to the welded portion (721) between the upper metal gas pipe (72) and the adjacent upper metal gas pipe (72) with elastic force.

[0060] When tightly sealed in this way, there is primarily no additional supply of moisture and oxygen from the outside.

[0061] In addition, moisture and oxygen present inside in a sealed state are dehumidified and rust-prevented by the dehumidifying part (2) and the rust-preventing part (3) forming a primary layer and a secondary layer with a ventilation hole (4) on the inner surface of the elastic film.

[0062] The present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary knowledge in the art to which the invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims, and such modifications will be within the scope of the claims. Explanation of the symbols

[0063] (1) : Elastic film (2) : Dehumidifying part (3) : Rust prevention part (4) : Ventilation port (5) : Sealing member (7) : Heterogeneous joint pipe (71) : Synthetic resin gas pipe (72) : Metal gas pipe (721) : Welded part

Claims

Claim 1 The device comprises: an elastic film (1) that seals the welded connection section between a synthetic resin joint pipe fused to a synthetic resin gas pipe exposed above ground among city gas pipelines and a metal gas pipe at the top of the synthetic resin joint pipe by adhering to it; a dehumidifying part (2) formed on the inner surface of the sealed elastic film (1) that removes moisture present in the sealed space while providing a buffering force; and a rust-preventing part (3) formed on the inner surface of the sealed elastic film (1) that prevents oxygen penetration by forming a film on the metal gas pipe through the sublimation action of the material; wherein one selected from the dehumidifying part (2) or the rust-preventing part (3) forms a primary layer on the inner surface of the elastic film (1), and the other is laminated to form a secondary layer, wherein the secondary layer formed by the one selected from the dehumidifying part (2) or the rust-preventing part (3) has a plurality of ventilation holes (4) formed therein so as to communicate with the remaining rust-preventing part (3) or dehumidifying part (2) constituting the primary layer. A composite film for preventing corrosion of welded parts of city gas pipes, characterized in that the corrosion-preventing part (3) is formed by a volatile corrosion inhibitor that blocks oxygen penetration by forming a film through the sublimation of a material on the surface of a metal or corrosion-preventing part, and the dehumidification part (2) and the corrosion-preventing part (3) are each formed as film layers. Claim 2 delete Claim 3 A composite film for preventing corrosion of a welded part of a city gas pipeline according to claim 1, wherein the dehumidification part (2) is composed of one or more selected from calcium chloride, silica gel, super absorbent polymer, bentonite, charcoal powder, sulfuric acid, and zeolite. Claim 4 delete Claim 5 delete Claim 6 A composite film for preventing corrosion of a welded part of a city gas pipe according to claim 1, characterized in that the composite film is multi-sealed by tying the outer upper, middle, and lower portions of the elastic film (1) around the gas pipe with a sealing member (5) selected from an elastic cord, a rubber magnet, a mechanical clamp, and a cable tie.

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