CN115717972A - Method for measuring sealing of threaded joint after pipeline installation - Google Patents
Method for measuring sealing of threaded joint after pipeline installation Download PDFInfo
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- CN115717972A CN115717972A CN202211444527.4A CN202211444527A CN115717972A CN 115717972 A CN115717972 A CN 115717972A CN 202211444527 A CN202211444527 A CN 202211444527A CN 115717972 A CN115717972 A CN 115717972A
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- chock
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Abstract
The invention provides a method for measuring the sealing of a threaded joint after pipeline installation. According to the method, the sealing state of the threaded joint after installation is judged by converting the moment measurement of the compression amount of the gasket under the pressure-bearing index into the indirect measurement of the chock during the design of the threaded joint, and the technical problem of sealing failure of the pipeline with the threaded joint is solved. By using the plug block, the fastening amount of the pipeline with the threaded joint can be measured when the pipeline is installed, and the judgment on the sealing state of the installed pipeline with the threaded joint is realized; the chock block provided by the invention is small and portable, so that the required operation space is small, and repeated leakage detection and fastening at the later stage are not needed; the construction steps are simplified, and the construction efficiency is improved; the problem that the sealing of the threaded joint fails due to large torque measurement error and incapability of measurement can be solved, the initial installation qualified state of the threaded joint is greatly improved, the secondary fastening quantity of the threaded joint is remarkably reduced, the system tightness qualified efficiency is improved, and the method is suitable for being used as a threaded joint sealing measurement method after pipeline installation.
Description
Technical Field
The invention relates to the field of pipeline sealing, in particular to connection and installation of a threaded joint pipeline, and specifically relates to a method for measuring the sealing of the threaded joint after pipeline installation.
Background
When the threaded joint is designed, the sealing effect is realized by mainly compressing a gasket through the flat shoulder joint and the screwed joint and then sealing, particularly for some customized high-pressure joints, the gasket compression amount directly determines the installation state of the threaded joint. The direct feedback index of the compression condition is a fastening torque value of the threaded joint outer sleeve nut, and the torque value is a theoretical test value of at least one end of the threaded joint in a free state.
In the actual installation of threaded joint pipeline, what the real fastening torque of threaded joint feedbacked not only is the gasket compression volume, can contain simultaneously and overcome the fastening frictional force that produces because of pipeline tensile deformation, cause the actual measurement moment although reach theoretical fastening torque, but threaded joint inner gasket does not reach anticipated pressurized, causes sealed inefficacy.
In the actual installation of threaded joint pipeline, also there is the space restriction such as receiving peripheral pipeline, equipment, can't use the moment spanner to measure, only can realize the fastening to lead to unable judgement actual installation state, cause sealed inefficacy.
For the joint with sealing failure, the joint after the pipeline thread is fastened and installed in the test process needs to be subjected to leakage detection and fastening again for multiple times in a large area so as to achieve the pressure index of gasket compression sealing, guarantee that the system tightness is qualified, and have the advantages of large workload, more repeated work, low construction efficiency and incapability of guaranteeing the pipeline sealing state.
Disclosure of Invention
In order to ensure the sealing of the pipeline with the threaded joint, the invention provides a method for measuring the sealing of the threaded joint after the pipeline is installed. According to the method, the compression amount of the gasket under the pressure-bearing index is converted from torque measurement to indirect measurement of the plug block when the threaded joint is designed, the sealing state of the installed threaded joint is judged, and the technical problem that the pipeline with the threaded joint fails in sealing is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for measuring the sealing of a threaded joint after pipeline installation comprises the following steps:
step one, measuring theoretical clearance of the threaded joint:
more than three sets of the same batch of screwed joint groups are selected, the tool pipeline is manufactured according to the manufacturing process, and the screwed joint groups are connected according to theoretical fastening torque in a free installation state, so that the screwed joint groups have tightness test conditions. And measuring the clearance value between the screwed-in joint and the nut in the connected threaded joint, uniformly measuring four points of each set of joint, and taking an average value.
Secondly, theoretical clearance technology confirmation:
and performing tightness test on the tool pipeline, rechecking the sealing performance of the threaded joint under the theoretical fastening torque, and meeting the requirement of tightness pressure.
Thirdly, determining a theoretical value of the chock:
and taking the data before the tightness test is qualified as data for acquiring information, and taking the average value of the minimum value of the measured gap value of each set of joint as the theoretical width value of the chock.
Fourthly, manufacturing a chock:
the chock is manufactured according to the theoretical width value of the chock, the material is stainless steel or carbon steel, and the machining precision of the chock meets GB/T1804F level.
Fifthly, the use of the chock is verified:
replacing a threaded joint gasket in a tool pipeline, placing a chock between a joint and a nut, fastening the nut until two ends of the chock are in contact with the joint and the nut, taking down the chock, and retesting the torque of a threaded joint group by using a torque wrench, wherein the threaded joint cannot rotate; if the chock block rotates, the width of the chock block is adjusted and reduced, the gasket is replaced, torque retest is carried out again until the threaded joint does not rotate and the chock block is qualified after being matched with the theoretical torque.
Sixthly, the chock is applied:
and plugging the qualified chock into the gap of the threaded joint to be detected to measure the fastening state of the threads.
The beneficial effects of the invention are: by using the chock block, the fastening amount of the pipeline with the threaded joint can be measured when the pipeline with the threaded joint is installed, the judgment on the sealing state of the pipeline with the threaded joint after the pipeline with the threaded joint is installed is realized, the influence on the pipeline with the threaded joint caused by the fastening friction force generated by the stretching and deformation of the pipeline is eliminated, the pipeline installation only depending on theoretical fastening torque is avoided, the situation that the pipeline installation does not meet the sealing requirement due to the fact that a threaded gasket does not reach the actual bearing pressure is caused, and the sealing state of the pipeline with the threaded joint is ensured;
the chock block provided by the invention is small and portable, and the required operation space is small, so that the tightness of the threaded connector can be measured after the threaded connector is installed, and repeated leakage detection and fastening at a later stage are not needed; meanwhile, the situation that the thread fastening state cannot be measured by using a torque wrench due to limited operation space is overcome, the method does not need to use the torque wrench again for measurement, the construction steps are simplified, and the construction efficiency is improved;
the method for measuring the sealing of the threaded joint pipeline can avoid the problems of large torque measurement error and failure of the sealing of the threaded joint caused by incapability of measurement, greatly improve the initial installation qualified state of the threaded joint, obviously reduce the secondary fastening quantity of the threaded joint, improve the system tightness qualified efficiency, and is suitable for being applied as a method for measuring the sealing of the threaded joint after the pipeline is installed.
Drawings
FIG. 1 is a schematic view of a threaded joint pipe configuration;
FIG. 2 is a schematic view of a chock installation;
FIG. 3 is a schematic view of a plug;
fig. 4 is a schematic view ii of the stopper.
In the figure, 1 is a joint, 2 is a nut, 3 is a gasket, 4 is a flat shoulder joint, and 5 is a chock block.
Detailed Description
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
All embodiments, implementations and features of the invention can be combined with each other in the invention without contradiction or conflict. In the present invention, conventional devices, apparatuses, components, etc. are either commercially available or self-made according to the present disclosure. In the present invention, some conventional operations and apparatuses, devices, components are omitted or only briefly described in order to highlight the importance of the present invention.
Taking a high-pressure air connector as an example, a plug block is manufactured and a sealing test is performed on the connector of the type as follows:
firstly, selecting three sets of DN32 threaded joint groups in the same batch which are qualified through inspection, and selecting four stainless steel pipes which are matched with the three sets of DN32 threaded joint groups and have the length of about 200mm to be combined and welded with the threaded joints. And three sets of threaded joint groups are assembled and connected in series, wherein a pipeline at one end is welded and blocked, and the other end is welded with the tool joint, so that the three sets of threaded joint groups have the condition of connecting an external pressurizing system. Under the condition that all joints and tool pipelines are not fixed, fastening the joint 1 according to a theoretical value of a theoretical moment 600N m value corresponding to the drift diameter, simultaneously connecting a pressing tool, measuring a gap value between the screwed joint 1 and the nut 2 in the connected threaded joint, uniformly measuring four points in each set of threaded joint group, taking an average value after measurement, measuring the average value to be 4.85mm, and recording.
And secondly, performing a tightness test on the tool pipeline connected with the joint, maintaining the pressure for 10min after the test pressure reaches 60MPa without leakage and pressure drop, namely the seal is qualified, and removing the tool pipeline and each joint 1 after the test is qualified.
And thirdly, calculating the data of the mining letter before the test is qualified, selecting the minimum value of the measured value of each set of the threaded joint group, and calculating the average value of the three minimum values to be used as the theoretical width value of the chock 5, as shown in the attached figure 2 of the specification.
Secondly, the chock 5 is manufactured according to the theoretical width value of the chock 5, in order to facilitate later use, the length of the chock 5 can be increased, the height of the chock 5 is increased by 20mm on the basis that the chock 5 protrudes out of the outer sleeve nut 2 after installation, meanwhile, the chock 5 is internally and externally marked and manufactured by carbon steel or stainless steel, and the machining precision of the chock 5 meets the GB/T1804F level, as shown in the attached figure 3 of the specification.
Finally, replacing the threaded joint gasket 3 in the disassembled tool pipeline, placing the chock 5 between the joint 1 and the nut 2, marking the outer side of the chock 5 outwards, simultaneously fastening the outer sleeve nut 2 until the two ends of the chock 5 are both in contact with the outer sleeve nut 2 and the screwed joint 1, stopping fastening, gently taking down the chock 5, performing torque retest on the fastening torque 600 N.m of the threaded joint group by using a torque wrench, and determining that the chock 5 meets the requirements if the threaded joint does not rotate at the moment;
in the above steps, if a torque wrench is used for torque retest of the threaded joint group, the thread rotates, the width of the chock 5 is adjusted according to the decrement of 0.02mm, the chock 5 after decrement replaces the gasket 3, the torque retest is carried out again until the threaded joint does not rotate, and the chock 5 is considered to meet the requirement.
The other thread joint groups can then be measured for tightening conditions using the qualified plugs 5.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for measuring the sealing of a threaded joint after pipeline installation is characterized by comprising the following steps:
step one, measuring theoretical clearance of the threaded joint:
selecting more than three sets of screwed joint groups in the same batch, manufacturing a tool pipeline according to a manufacturing process, and connecting according to theoretical fastening torque in a free installation state to enable the tool pipeline to have tightness test conditions; measuring the clearance value between the screwed-in connector (1) and the nut (2) in the connected threaded connector group, uniformly measuring four points of each set of connector, and taking an average value;
secondly, theoretical clearance technology confirmation:
performing a tightness test on the tool pipeline, and rechecking the sealing performance of the threaded joint (1) under a theoretical fastening torque to meet the requirement of tightness pressure;
thirdly, determining a theoretical value of the chock block (5):
taking data before the tightness test is qualified as data for acquiring information, and taking the average value of the minimum value of the measured gap value of each set of joint as the theoretical width value of the chock (5);
fourthly, manufacturing a chock:
manufacturing the chock block (5) according to the theoretical width value of the chock block (5);
fifthly, the use of the chock is verified:
replacing a threaded joint gasket (3) in a tool pipeline, placing a chock (5) between a joint (1) and a nut (2), fastening the nut (2) until two ends of the chock (5) are in contact with the joint (1) and the nut (2), taking down the chock (5), and performing torque retest on fastening torque of a threaded joint group by using a torque wrench, wherein the threaded joint does not rotate at the moment; if the chock block rotates, adjusting to reduce the width of the chock block, replacing the gasket (3) and performing torque retest again until the threaded joint does not rotate and the chock block (5) is qualified after the threaded joint is matched with the theoretical torque;
sixthly, the chock is applied:
and plugging the qualified plug block (5) into the gap of the threaded joint group to be detected to measure the fastening state of the threads.
2. The method of measuring the seal of a threaded joint after the installation of a pipe according to claim 1,
the chock block (5) is made of stainless steel or carbon steel, and the machining precision of the chock block meets GB/T1804F level.
3. The method of measuring the seal of a threaded joint after the installation of a pipe according to claim 1,
the height of the chock block (5) is greater than the height of the gap of the threaded joint set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211444527.4A CN115717972A (en) | 2022-11-18 | 2022-11-18 | Method for measuring sealing of threaded joint after pipeline installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211444527.4A CN115717972A (en) | 2022-11-18 | 2022-11-18 | Method for measuring sealing of threaded joint after pipeline installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115717972A true CN115717972A (en) | 2023-02-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211444527.4A Pending CN115717972A (en) | 2022-11-18 | 2022-11-18 | Method for measuring sealing of threaded joint after pipeline installation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115717972A (en) |
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2022
- 2022-11-18 CN CN202211444527.4A patent/CN115717972A/en active Pending
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