CN117948551A - Pipe fitting connection tightness detection method - Google Patents
Pipe fitting connection tightness detection method Download PDFInfo
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- CN117948551A CN117948551A CN202410045749.1A CN202410045749A CN117948551A CN 117948551 A CN117948551 A CN 117948551A CN 202410045749 A CN202410045749 A CN 202410045749A CN 117948551 A CN117948551 A CN 117948551A
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- gas
- pipeline
- pipeline system
- test
- valve
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- 238000001514 detection method Methods 0.000 title description 9
- 238000012360 testing method Methods 0.000 claims abstract description 62
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 13
- 238000004880 explosion Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 126
- 238000002156 mixing Methods 0.000 claims description 37
- 238000003466 welding Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 230000001680 brushing effect Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000011156 evaluation Methods 0.000 abstract description 2
- 238000011056 performance test Methods 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 24
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 229910052739 hydrogen Inorganic materials 0.000 description 8
- 239000003345 natural gas Substances 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to the technical field of sealing performance test, in particular to a method for detecting the air tightness of a gas pipeline pipe fitting and pipeline connection, which aims to safely and reliably detect the air tightness of pipe fittings such as a steel-plastic adapter, a valve and the like and pipeline connection, and before the test, air in a pipeline system is pumped out through a connecting vacuum pump, so that the mixed gas and air of the test is prevented from exceeding an explosion limit to cause explosion danger; the method is favorable for safely and reliably evaluating the gas pipeline pipe fitting and pipeline connection air tightness, ensures the safety of testers, and can provide evaluation basis for the reliability of the pipeline system connection process.
Description
Technical Field
The invention relates to the technical field of sealing performance test, in particular to a method for detecting the air tightness of gas pipeline pipe fittings and pipeline connection.
Background
With the development of the hydrogen energy industry, the transportation of the hydrogen-doped natural gas based on the existing gas pipeline becomes an economic and efficient research and development direction. The air tightness of the connection of the steel-plastic adapter, the valve and other pipe fittings and the pipeline is a key link in the gas pipeline quality evaluation process. The good air tightness can not only avoid gas waste caused by leakage of a pipeline system, but also reduce the occurrence probability of safety accidents such as explosion and the like caused by gas permeation leakage, and the gas tightness is directly related to the life and property safety of vast users.
Current methods of testing the tightness of pipe joints generally suffer from two problems: first, the problem of detection safety is not considered. The internal air of the test pipeline system is not discharged before the test, so that the combustible gas for testing the air tightness is mixed with the air in the pipe, and serious potential safety hazards are buried; secondly, the leak detection method is single, and the reliability is insufficient. The air tightness of the pipe fitting is evaluated only by the change of the pressure representation number in the test process, and the precision of the pressure gauge is limited, so that fine leakage is difficult to detect, and the leakage position is difficult to quickly determine. Therefore, under the large background, a safe and reliable detection method for testing the air tightness of the connection between the pipe fittings such as the steel-plastic adapter and the valve and the pipeline is urgently needed.
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a detection method for gas pipeline pipe fitting connection air tightness, which can ensure the detection safety and complete the detection of pipeline system air tightness and quickly determine the leakage position.
The solution adopted by the invention comprises the following steps in sequence:
Step 1: welding pipeline system sealing plates at two ends of a pipeline system comprising a steel-plastic conversion joint and a pipeline welding joint or a PE valve pipe fitting, welding an interface connected with a vacuum pump at one end of the pipeline system sealing plate, and welding an interface connected with a digital gas mixing device at the other end of the pipeline system sealing plate;
Step 2: the pipeline system is arranged in the test system and is arranged on the base to ensure that the pipeline system is stable and free from vibration interference; coating vacuum mud at the interface to ensure proper connection, and arranging a gas sensor at a gas sensor arrangement area or a soapy water brushing area;
step 3: opening a vacuum pump and a pipeline system exhaust valve to pump out air in the pipeline system, and ensuring that the residual air in the pipeline system is insufficient to cause combustion and explosion of the test gas according to the combustion limit and explosion limit of different test gases; closing a vacuum pump valve and a pipeline system exhaust valve after air extraction to ensure the vacuum degree of the pipeline system;
step 4: mixing the gas components required by the test by using a digital gas mixing device, opening a gas delivery valve to introduce the gas into a pipeline system, and closing the valve after the gas delivery valve is completed;
Step 5: standing the pipeline system, periodically observing the pressure gauge number of the test system within a set time, paying attention to whether the gas sensor has an alarm or not, or observing whether the soapy water generates bubbles or not, and recording;
Step 6: after the test is finished, the exhaust valve is opened, the gas is exhausted through the digital gas mixing device, the pipeline system is disassembled, and the test results are summarized.
The further improvement is that: and (2) after the pipeline system is installed in the step (2), introducing inert gases such as nitrogen and the like to detect whether the pipeline is properly connected.
The further improvement is that: and (3) after the test in the step (6) is finished, starting a vacuum pump to pump out the test gas in the pipeline system, inputting inert gas such as nitrogen into the pipeline through a gas mixing device to balance the air pressure of the pipeline system with the air environment, and then removing the pipeline system.
The vacuum pump is used for vacuumizing a pipeline system, and the vacuum degree can be controlled;
The digital gas mixing device is used for accurately mixing test gas according to components of the gas to be tested, the device comprises a gas mixing cavity, an air inlet valve, a gas transmission valve and an air outlet valve, and the air inlet valve is used for inputting combustible gas into the mixing cavity
The gas transmission valve is used for inputting mixed gas to the test pipeline system;
The exhaust valve is used for exhausting the mixed cavity gas outwards after the test;
the vacuum mud can be used for sealing a pipeline interface, so that the air tightness is good;
the gas sensor is used for detecting gas leakage and is connected with an alarm device;
the pressure gauge is used for monitoring the pressure of the gas in the pipeline system.
By adopting the technical scheme, the invention has the following beneficial effects: the air in the pipeline system is discharged before the experiment by installing the vacuum pump, so that the safety of the test is ensured; a digital gas mixing device is adopted to accurately mix the test gas according to the gas components of the test requirements; by adopting the mode of installing the pressure gauge and arranging the gas sensor, the detection of the air tightness of the pipeline system and the rapid determination of the leakage position can be realized. Through adopting this scheme, can safe and reliable detect pipe fitting such as steel plastic crossover sub and the gas tightness of pipe connection to can confirm the position of leaking fast. The safety of the testers is guaranteed, and an evaluation basis can be provided for the reliability of the pipeline system connection process.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test system according to the present invention.
FIG. 2 is a schematic diagram of a vacuum test system prior to testing a steel-plastic adapter tube system.
FIG. 3 is a schematic diagram of a test system for testing a steel-plastic adapter tube system.
Fig. 4 is a schematic diagram of the test system after the end of the test of the steel-plastic adapter tube system.
Fig. 5 is a schematic diagram of a PE valve tubing test system.
FIG. 6 is a schematic diagram of a PE valve tubing test-before-test vacuum test system.
FIG. 7 is a schematic diagram of a PE valve tubing test system
FIG. 8 is a schematic diagram of the test system after PE valve tubing testing is completed.
In the drawings, the list of components represented by the various numbers is as follows:
1. An intake valve; 2. a digital gas mixing device; 3. an exhaust valve; 4. an air delivery valve; 5. a pressure gauge valve; 6. a pressure gauge; 7. a piping seal plate; 8. a steel-plastic adapter; 9. a pipe welding joint; 10. a ductwork exhaust valve; 11. a vacuum gauge; 12. a vacuum gauge valve; 13. a vacuum pump; 14. a base; 15. a gas sensor arrangement area or an area coated with soapy water; 16. PE valve pipe fitting.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be further described below, but the present invention is not limited to the following examples.
Embodiment one: under the pressure of 0.2MPa and the environment of 60 percent hydrogen and 40 percent natural gas mixed gas, the gas pipeline steel-plastic adapter 8 is tested for connecting gas tightness, and the method comprises the following steps:
Step 1: welding a pipeline system sealing plate 7 at two ends of a pipeline system comprising a steel-plastic conversion joint 8, welding an interface connected with a vacuum pump 13 at one end of the pipeline system sealing plate 7, and welding an interface connected with the digital gas mixing device 2 at the other end;
step 2: installing a pipeline system in a test system, coating vacuum mud at an interface to ensure proper connection, arranging a gas sensor at key links such as the connection of the steel-plastic adapter 8 and the pipeline, and closing all valves, the vacuum pump 13 and the digital gas mixing device 2 at the moment as shown in fig. 1;
step 3: as shown in fig. 2, the pressure gauge valve 5, the pipeline system exhaust valve 10 and the vacuum gauge valve 12 are opened, the vacuum pump 13 is opened to completely extract the gas in the pipeline system, the pipeline system exhaust valve 10 is closed after the gas extraction, the vacuum pump 13 is closed, and the vacuum degree of the pipeline system is ensured;
Step 4: as shown in fig. 3, the digital gas mixing device 2 is utilized to mix the gas components required by the test, namely 60% hydrogen and 40% natural gas, the air inlet valve 1 is opened, 3:2 hydrogen and methane gas are respectively introduced, the air inlet valve 1 is closed, and the stirrer of the digital gas mixing device 2 is opened; after the gas mixing is finished, the digital gas mixing device 2 is closed, the gas transmission valve 4 is opened to introduce the mixed gas into the pipeline system, the gas pressure in the pipeline system to be detected is ensured to reach 0.2MPa during gas transmission, and the gas transmission valve 4 is closed after the gas mixing is finished; at this time, the pipeline system is filled with test gas, and the pressure gauge 6 displays 0.2 MPa;
Step 5: standing the pipeline system for 1h, observing the number of the pressure gauge 6 of the test system and whether the gas sensor alarms or not at intervals of 20min in a specified time, and recording;
Step 6: after the test is finished, as shown in fig. 4, the gas delivery valve 4 is opened, the gas discharge valve 3 of the digital gas mixing device 2 is opened, the gas is discharged, the pipeline system is disassembled, and the test results are summarized to evaluate the air tightness of the pipeline system containing the steel-plastic adapter 8.
The natural gas is resident natural gas, the component is mainly methane, and the natural gas also contains a small amount of ethane, butane, pentane, carbon dioxide, carbon monoxide, hydrogen sulfide and the like.
Embodiment two: under the pressure of 0.5MPa and the mixed gas environment of 20% hydrogen and 80% methane, the gas tightness of the PE valve connection of the gas pipeline is tested, and the method comprises the following steps:
step 1: the two ends of the pipeline system comprising the PE valve pipe fitting 16 are welded with the pipeline system sealing plate 7, one end of the pipeline system sealing plate 7 is welded with an interface connected with the vacuum pump 13, and the other end is welded with an interface connected with the digital gas mixing device 2;
step 2: installing a pipeline system in a test system, coating vacuum mud at an interface to ensure proper connection, brushing soapy water at key links such as the connection of a valve and a pipeline, and closing all the valves, the vacuum pump 13 and the digital gas mixing device 2 at the moment as shown in fig. 5;
Step 3: inquiring that the explosion limit of hydrogen is 4.0-75.6% (volume concentration) and the explosion limit of methane is 4.9-16% (volume concentration); as shown in fig. 6, the pressure gauge valve 5, the pipeline system exhaust valve 10 and the vacuum gauge valve 12 are opened, the vacuum pump 13 is opened to pump air in the pipeline system to a volume concentration of less than 24.4%, the pipeline system exhaust valve 10 is closed after pumping, and the vacuum pump 13 is closed to ensure the vacuum degree of the pipeline system;
Step 4: as shown in fig. 7, the digital gas mixing device is used for mixing the components of the fuel gas required by the test, namely 20% hydrogen and 80% methane, an air inlet valve 1 is opened, hydrogen and methane gases in a ratio of 1:4 are respectively introduced, the air inlet valve 1 is closed, and a stirrer of the digital gas mixing device 2 is opened; after the gas mixing is finished, the digital gas mixing device 2 is closed, the gas transmission valve 4 is opened to introduce the mixed gas into the pipeline system, the gas pressure in the pipeline system to be detected is ensured to reach 0.5MPa during gas transmission, and the gas transmission valve 4 is closed after the gas mixing is finished; at this time, the PE valve pipe fitting 16 is filled with the test gas, and the pressure gauge 6 displays 0.5 MPa;
step 5: standing the pipeline system for 1h, observing the pressure gauge number of the test system and whether bubbles are generated in a place where the outer wall of the pipeline system is coated with soapy water every 20min in a specified time, and recording;
Step 6: as shown in fig. 8, after the test, the vacuum pump 13 is turned on to pump out the test gas in the valve-containing piping system, and inert gas such as nitrogen is introduced into the piping by the gas mixing device 2 to balance the air pressure in the piping with the atmosphere (the number indicated by the observation pressure gauge 6), and then the piping system is removed, and the test results are collected to evaluate the air tightness of the valve-containing piping system.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (10)
1. The method for detecting the gas tightness of the gas pipeline pipe fitting connection comprises the following steps in sequence:
Step 1: welding pipeline system sealing plates (7) at two ends of a pipeline system comprising a steel-plastic conversion joint (8) and a pipeline welding joint (9) or a PE valve pipe fitting (16), welding an interface connected with a vacuum pump (13) at one end of the pipeline system sealing plate (7), and welding an interface connected with a digital gas mixing device (2) at the other end;
Step 2: the pipeline system is arranged in the test system and is arranged on the base (14) to ensure that the pipeline system is stable and free from vibration interference; applying vacuum mud at the interface to ensure proper connection, and arranging a gas sensor or brushing soapy water at a gas sensor arrangement area or a soapy water brushing area (15);
Step 3: opening a vacuum pump (13) and a pipeline system exhaust valve (10) to exhaust air in the pipeline system, and ensuring that the residual air in the pipeline system is insufficient to cause combustion explosion of the test gas according to the combustion limit and explosion limit of different test gases; after air extraction, a valve of a vacuum pump (13) and an exhaust valve (10) of the pipeline system are closed, so that the vacuum degree of the pipeline system is ensured;
Step 4: the digital gas mixing device (2) is utilized to mix the gas components required by the test, the gas delivery valve (4) is opened to introduce the gas into the pipeline system, and the valve is closed after the gas delivery valve is completed;
Step 5: standing the pipeline system, periodically observing the pressure gauge number of the test system within a set time, paying attention to whether the gas sensor has an alarm or not, or observing whether the soapy water generates bubbles or not, and recording;
step 6: after the test is finished, the exhaust valve (3) is opened, the gas is exhausted through the digital gas mixing device (2), the pipeline system is disassembled, and the test results are summarized.
2. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: and (2) after the pipeline system is installed in the step (2), introducing inert gases such as nitrogen and the like to detect whether the pipeline is properly connected.
3. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: after the test in the step 6 is finished, a vacuum pump (13) is turned on to pump out the test gas in the pipeline system, inert gas such as nitrogen is input into the pipeline through the digital gas mixing device (2) to balance the air pressure of the pipeline system with the atmosphere, then the pipeline system is detached, and the test result is summarized to evaluate the air tightness of the pipeline system with the valve.
4. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: the vacuum pump (13) is used for vacuumizing a pipeline system and can control the vacuum degree.
5. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: the digital gas mixing device (2) is used for accurately mixing test gas according to gas components to be tested, the digital gas mixing device (2) comprises a gas mixing cavity, an air inlet valve (1), a gas transmission valve (4) and an air outlet valve (3), and the air inlet valve (1) is used for inputting combustible gas into the mixing cavity.
6. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: the gas transmission valve (4) is used for inputting mixed gas into the test pipeline system.
7. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: the exhaust valve (3) is used for exhausting the mixed cavity gas outwards after testing.
8. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: the vacuum mud can be used for sealing a pipeline interface, so that the air tightness is good.
9. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: the gas sensor is used for detecting gas leakage and is connected with an alarm device.
10. The method for detecting the air tightness of the connection of the gas pipeline pipe fitting according to claim 1, wherein the method comprises the following steps: the pressure gauge (6) is used for monitoring the pressure of the gas in the pipeline system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410045749.1A CN117948551A (en) | 2024-01-12 | 2024-01-12 | Pipe fitting connection tightness detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410045749.1A CN117948551A (en) | 2024-01-12 | 2024-01-12 | Pipe fitting connection tightness detection method |
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| Publication Number | Publication Date |
|---|---|
| CN117948551A true CN117948551A (en) | 2024-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410045749.1A Pending CN117948551A (en) | 2024-01-12 | 2024-01-12 | Pipe fitting connection tightness detection method |
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| Country | Link |
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| CN (1) | CN117948551A (en) |
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- 2024-01-12 CN CN202410045749.1A patent/CN117948551A/en active Pending
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