Leakage-free hanging piece quick replacement device and method

Abstract

The invention discloses a leakage-free hanging piece quick replacement device and method, and the device comprises a conveying part which is provided with a valve assembly; the two ends of the connecting piece are connected with the valve assembly, and a hanging piece assembly and a pressure gauge are arranged on the connecting piece; the replacement assemblies are installed at the two ends of the connecting piece and used for replacing gas in the connecting piece. According to the replacement device, a technical route of partial replacement of the pressure tapping flange and the small gas cylinder is adopted, the replacement process of the coupon test section is opened, the requirement for independent replacement of the connecting pipe is met, and reliable guarantee is provided for personnel safety, test progress guarantee and field operation stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and natural gas gathering, transportation and processing, and particularly relates to a leak-free coupon quick replacement device and method. Background Art

[0002] The weight loss coupon test is an important means widely used to detect and monitor the corrosion of specific materials or media. The authenticity of its data will directly affect the relevant research results and the applicability of anti-corrosion measures, such as corrosion inhibition research and evaluation. As an important part of this method, the quality of the corrosion test coupon will have an important impact on the data. The corrosion test (coupon) is hung in a test container, on-site heat exchanger or test pipeline for detection. It is a standard metal test coupon for measuring corrosion. Its basic measurement principle is that the metal loses weight due to corrosion. The weight loss within a certain exposure time is the corrosion rate. A coupon is placed in the process environment. After a certain period of time, the coupon is taken out for analysis. According to the time period, the surface area of the specimen, the density of the specimen material, and the weight loss, its corrosion rate is calculated.

[0003] The advantages of the coupon method are as follows: First, it can be used in working environments with gases, liquids, solids / particles and fluids; second, visual inspection is possible; third, corrosion deposits can be observed and analyzed; fourth, the metal loss can be directly obtained and the corrosion rate can be calculated; fifth, local corrosion can be identified and measured; sixth, the performance of inhibitors can be evaluated.

[0004] Currently, in typical monitoring projects, the exposure time of the coupon is 30 - 90 days, and then it is taken out for analysis in the laboratory and periodic monitoring is carried out. The disadvantage of the coupon method is that if corrosion fluctuations occur during the exposure time, the coupon alone cannot determine the time when the fluctuations occur, and it cannot record the time when the weight loss increases significantly according to the peak value and time period of the fluctuations. Therefore, coupon monitoring is most suitable for environments where the corrosion rate does not change significantly for a long time.

[0005] Such as attached Figure 3As shown in the figure, in the current coupon test of the gas field, the test pipe section is connected in parallel with the operating pipeline, and then the originally normally produced gas flow is introduced into the test pipe section by operating the switches of the first valve, the second valve, and the third valve to conduct tests on the coupon device inside the pipeline. This set of test devices has been widely applied in multiple gas fields, which can timely grasp the corrosion status of pipelines in key areas, strengthen pipeline management and governance, and give early warnings to high-risk pipelines in a timely manner. However, there are still the following problems in operation. First, the used devices need to collect and release coupons according to the maintenance cycle of the plant station. According to the current maintenance cycle of the gas gathering station and the treatment plant once a year, the coupon test cycle is too long. Second, when working according to the coupon test cycle, the whole station needs to be emptied and replaced with nitrogen, which affects the normal production of natural gas and causes waste of investment. Third, in order to reduce investment and ensure the coupon test effect, on-site employees perform illegal operations, close the second valve and the third valve, and directly release natural gas from the pressure gauge, which is prone to accidents such as poisoning and fire. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems in the prior art and provide a leak-free coupon quick replacement device and method.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions to achieve:

[0008] According to the first aspect of the present invention, a leak-free coupon quick replacement device is provided, including:

[0009] A conveying member, on which a valve assembly is provided;

[0010] A connecting member, both ends of which are connected to the valve assembly, and a coupon assembly and a pressure gauge are provided on the connecting member;

[0011] A replacement assembly, installed at both ends of the connecting member, for replacing the gas inside the connecting member.

[0012] Further, the conveying member is an operating pipeline, the operating pipeline includes a straight pipe and a bent pipe, and the valve assembly includes a first valve, a second valve, and a third valve;

[0013] The straight pipe includes a first straight pipe and a second straight pipe, the bent pipe includes a first bent pipe and a fourth bent pipe, and the first straight pipe and the second straight pipe are connected by a first valve;

[0014] One end of the first bent pipe and the second bent pipe are respectively connected to the first straight pipe and the second straight pipe, the other ends of the first bent pipe and the second bent pipe are respectively connected to the second valve and the third valve, and the second valve and the third valve are connected to the connecting member through a replacement assembly.

[0015] Furthermore, the connecting piece is a connecting pipe, and the replacement assembly includes a first pressure-taking flange and a second pressure-taking flange, the first pressure-taking flange and the second pressure-taking flange are respectively installed at both ends of the connecting pipe, and the first pressure-taking flange and the second pressure-taking flange are respectively provided with an air supply part and a vent part.

[0016] Furthermore, the first pressure-taking flange is connected to the air supply component via a fourth valve, and the second pressure-taking flange is connected to the vent component via a fifth valve.

[0017] Furthermore, the gas supply member is a nitrogen gas cylinder.

[0018] Furthermore, the venting member is a venting pipe.

[0019] Furthermore, the fourth valve and the fifth valve are both quick-opening ball valves.

[0020] According to a second aspect of the present invention, a method for rapid replacement of leak-free hanging plates is provided, the method being performed using the replacement device as described above, comprising:

[0021] Release the pressure of the connecting pipe;

[0022] replacing the gas in the connecting pipe after the pressure is released;

[0023] Replace the hanging piece on the connecting pipe after the gas is replaced.

[0024] Further, replacing the gas in the connecting pipe after the pressure is released specifically includes:

[0025] Connect the nitrogen cylinder to the quick connector on the fourth valve and replace the gas in the connecting pipe;

[0026] Test the cock vent below the pressure gauge to determine whether the gas replacement is qualified.

[0027] Furthermore, the detection is to detect gas replacement using a portable flammable or toxic gas detector.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The replacement device adopts the technical route of partial replacement of pressure flange plus small gas cylinder, opens up the replacement process of the hanging test section, meets the needs of separate replacement of the connecting pipe, and provides reliable guarantee for personnel safety, test progress and smooth on-site operation.

[0030] 2. Solved the problem of long test cycle of hanging pieces, from once a year to inspection throughout the year.

[0031] 3. The operation steps of the whole-plant venting and replacement are reduced, and the original one-day operation is shortened to 30 minutes.

[0032] 4. The natural gas venting is reduced. Taking the gas gathering station with a capacity of 500,000 cubic meters per day as an example, the loss of 3,600 cubic meters of natural gas in the whole-plant venting is reduced to less than 1 cubic meter.

[0033] 5. The nitrogen replacement consumption is reduced. The original whole-plant replacement is optimized to local replacement. The nitrogen consumption is reduced from 12,000 cubic meters to 1 cubic meter, and the operation is simplified from using nitrogen trucks to using small nitrogen cylinders.

[0034] 6. The device does not increase the floor area, has no pipe volume clearance gas, and the replacement is complete.

[0035] 7. The safety and convenience of the coupon replacement are ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 FIG. is an overall schematic diagram of the leak-free coupon quick replacement device provided by the present invention; Figure 2 FIG. is a sectional schematic diagram of the pressure-taking flange in the leak-free coupon quick replacement device provided by the present invention; Figure 3 FIG. is a flow chart of the existing natural gas pipeline coupon test; Figure 4 FIG. is a flow chart of the leak-free coupon quick replacement method provided by the present invention.

[0040] Wherein: 1. First valve; 2. Second valve; 3. Coupon assembly; 4. Pressure gauge; 5. Third valve; 6. Connecting pipe; 7. Operating pipeline; 8. First pressure-taking flange; 9. Second pressure-taking flange; 10. Fourth valve; 11. Fifth valve; 12. Quick interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0042] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0043] It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0045] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0046] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The present invention will be further described in detail below with reference to the accompanying drawings:

[0048] The embodiments of the present invention provide a leak-free hanging piece quick replacement device and method.

[0049] This embodiment takes natural gas as an example for illustration, such as Figure 1As shown, according to the first aspect of the present invention, a leak-free quick-change device for hanging pieces is provided, which includes a conveying member for conveying natural gas and is provided with a valve assembly thereon; a connecting member whose both ends are connected to the valve assembly, and the valve assembly is used to make the natural gas in the conveying member flow into the connecting member. A hanging piece assembly 3 and a pressure gauge 4 are provided on the connecting member; and a replacement assembly is installed at both ends of the connecting member for replacing the gas inside the connecting member. When replacing the hanging piece assembly 3, first manually operate the valve assembly by hand to release the pressure in the connecting member until the pressure value on the pressure gauge 4 is zero; then, replace the natural gas in the connecting member through the replacement assembly. During the replacement process, combustible or toxic gas detection can be carried out through the cock vent below the pressure gauge 4 to determine whether the replacement is qualified. If not, close the cock vent below the pressure gauge 4 and continue the replacement; after the replacement is qualified, close the replacement assembly, replace the hanging piece assembly 3, and then carry out the replacement again, and detect whether the replacement is qualified through an oxygen detector. If not, continue the replacement; after the second replacement is qualified, operate the replacement assembly to release the natural gas. After continuously releasing for a certain time according to the volume of the connecting member, close the replacement assembly and observe the pressure of the pressure gauge 4; finally, use a portable combustible or toxic gas detector and soapy water to check for leaks in the opened hanging piece assembly 3. After the leak check is qualified, operate the valve assembly to resume normal production.

[0050] In this embodiment, as Figure 1 shown, the conveying member is a running pipeline 7. The running pipeline 7 includes a straight pipe and a bent pipe. The valve assembly includes a first valve 1, a second valve 2, and a third valve 5; the straight pipe includes a first straight pipe 701 and a second straight pipe 702, the bent pipe includes a first bent pipe 703 and a fourth bent pipe 704. The first straight pipe 701 and the second straight pipe 702 are connected through the first valve 1; one end of the first bent pipe 703 and the second bent pipe 704 are respectively connected to the first straight pipe 701 and the second straight pipe 702, and the other ends of the first bent pipe 703 and the second bent pipe 704 are respectively connected to the second valve 2 and the third valve 5. The second valve 2 and the third valve 5 are connected to the connecting member through the replacement assembly. When replacing the hanging piece assembly 3, first open the first valve 1 and close the second valve 2 and the third valve 5 (the first valve 1, the second valve 2, and the third valve 5 are all gate valves) to isolate the connecting member; specifically, the connecting member is a connecting pipe 6, and the replacement assembly includes a first pressure-taking flange 8 and a second pressure-taking flange 9 as Figure 2 shown, the first pressure-taking flange 8 and the second pressure-taking flange 9 are respectively installed at both ends of the connecting pipe 6. The first pressure-taking flange 8 and the second pressure-taking flange 9 are respectively provided with a gas supply member and a venting member. The gas supply member is a nitrogen gas cylinder, the venting member is a vent pipe, and the fourth valve 10 and the fifth valve 11 are both quick-opening ball valves.

[0051] According to the second aspect of the present invention, a method for quickly replacing a leak-free hanging piece is provided. The method is carried out by using the replacement device as described above, as Figure 4 shown, including: S101. Release the pressure of the connecting pipe; first open the first valve 1, close the second valve 2 and the third valve 5, open the fifth valve 11, and release the natural gas pressure in the connecting pipe 6 until the pressure value of the pressure gauge 4 is zero.

[0052] S101. Release the pressure of the connecting pipe; first open the first valve 1, close the second valve 2 and the third valve 5, open the fifth valve 11, and release the natural gas pressure in the connecting pipe 6 until the pressure value of the pressure gauge 4 is zero.

[0053] S102. Displace the gas in the connecting pipe after releasing the pressure; connect the nitrogen gas cylinder to the quick interface 12 on the fourth valve 10, then open the fourth valve 10 to displace the natural gas in the connecting pipe 6. During the displacement process, the combustible or toxic gas detection can be carried out on the cock drain port below the pressure gauge 4 by using a portable combustible or toxic gas detector to determine whether the displacement is qualified. If it is unqualified, close the cock drain port below the pressure gauge 4 and continue the displacement.

[0054] S103. Replace the hanging piece on the connecting pipe after displacing the gas; after the displacement is qualified, close the nitrogen gas cylinder outlet valve, the fourth valve 10 and the fifth valve 11 in sequence, open the original hanging piece assembly 3 to replace the old hanging piece, and after the replacement is completed, install and fix the hanging piece assembly 3; open the nitrogen gas cylinder outlet valve, the fourth valve 10 and the fifth valve 11 for nitrogen displacement, and detect whether the current displacement is qualified through the cock drain port below the pressure gauge 4 by using a portable oxygen detector. If it is unqualified, close the cock drain port below the pressure gauge 4 and continue the nitrogen displacement; after the displacement is qualified, close the nitrogen gas cylinder outlet valve, the fourth valve 10 and the fifth valve 11 in sequence, and finally open the second valve 2 and the fifth valve 11 to displace nitrogen with natural gas. According to the volume of the connecting pipe 6, after the natural gas is continuously released for a certain period of time, close the fifth valve 11 and observe the pressure of the pressure gauge 4; finally, use a portable combustible or toxic gas detector and soapy water to check for leaks on the opened hanging piece assembly 3. After the leak detection is qualified, open the third valve 5 to resume normal production.

[0055] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A leak-free quick-change device for hanging pieces, characterized in that, it includes: a conveying member, on which a valve assembly is provided; a connecting member, both ends of which are connected to the valve assembly, and a hanging piece assembly (3) and a pressure gauge (4) are provided on the connecting member; a replacement assembly, installed at both ends of the connecting member, for replacing the gas inside the connecting member.

2. The replacement device according to claim 1, characterized in that, the conveying member is a running pipeline (7), the running pipeline (7) includes a straight pipe and a bent pipe, and the valve assembly includes a first valve (1), a second valve (2) and a third valve (5); the straight pipe includes a first straight pipe (701) and a second straight pipe (702), the bent pipe includes a first bent pipe (703) and a fourth bent pipe (704), and the first straight pipe (701) and the second straight pipe (702) are connected by a first valve (1); one ends of the first bent pipe (703) and the second bent pipe (704) are respectively connected to the first straight pipe (701) and the second straight pipe (702), the other ends of the first bent pipe (703) and the second bent pipe (704) are respectively connected to the second valve (2) and the third valve (5), and the second valve (2) and the third valve (5) are connected to the connecting member through a replacement assembly.

3. The replacement device according to claim 2, characterized in that, the connecting member is a connecting pipe (6), the replacement assembly includes a first pressure-taking flange (8) and a second pressure-taking flange (9), the first pressure-taking flange (8) and the second pressure-taking flange (9) are respectively installed at both ends of the connecting pipe (6), and a gas supply member and a venting member are respectively provided on the first pressure-taking flange (8) and the second pressure-taking flange (9).

4. The replacement device according to claim 3, characterized in that, the first pressure-taking flange (8) is connected to the gas supply member through a fourth valve (10), and the second pressure-taking flange (9) is connected to the venting member through a fifth valve (11).

5. The replacement device according to claim 4, characterized in that, the gas supply member is a nitrogen gas cylinder.

6. The replacement device according to claim 4, characterized in that, the venting member is a vent pipe.

7. The replacement device according to claim 4, characterized in that, both the fourth valve (10) and the fifth valve (11) are quick-opening ball valves.

8. A leak-free quick-change method for hanging pieces, characterized in that, the method is carried out by using the replacement device according to any one of claims 1-7, and includes: releasing the pressure of the connecting pipe; replacing the gas inside the connecting pipe after releasing the pressure; replacing the hanging piece on the connecting pipe after replacing the gas.

9. The replacement method according to claim 8, characterized in that, replacing the gas inside the connecting pipe after releasing the pressure specifically includes: connecting the nitrogen gas cylinder to the quick interface on the fourth valve, and replacing the gas inside the connecting pipe; detecting at the cock venting port below the pressure gauge to judge whether the gas replacement is qualified.

10. The replacement method according to claim 9, characterized in that, The detection is to use a portable combustible or toxic gas detector to detect the gas replacement.

Images