CN112963645A

CN112963645A - Pipeline corrosion measuring device

Info

Publication number: CN112963645A
Application number: CN202110284889.0A
Authority: CN
Inventors: 彭星煜; 黄雪松; 任阳; 杨建�; 夏炜; 易建国; 刘芯月
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-06-15
Anticipated expiration: 2041-03-17
Also published as: CN112963645B

Abstract

The invention discloses a pipeline corrosion measuring device, which comprises a measuring pipe, wherein two ends of the measuring pipe are respectively connected with a buried main pipe and a lifting driving structure, an isolating valve is arranged on the pipe, an isolating chamber is arranged between the isolating valve and the lifting driving structure, a corrosion hanging piece is fixed at the tail end of a lifting rod, and the lifting driving structure is used for moving the lifting rod and driving the corrosion hanging piece to move between the buried main pipe and the isolating chamber; the isolating valve is a ball valve, and a rotating part is arranged at the tail end of the lifting rod; the rotating part passes in and out of the flow channel along with the lifting rod, when the bottom of the rotating part is positioned in the flow channel between the lifting driving structure and the rotating shaft, one end of the rotating part slides along the wall surface of the flow channel and pushes the valve core to rotate, and therefore the isolating valve is closed and opened. The isolating valve utilizes the lifting rod to open and close the pipeline, so that the pipeline can be buried underground to be close to a buried main pipe, the distance between the main pipe and an isolating chamber is shortened, the time for lifting the lifting rod is saved, the total length of the lifting rod is reduced, and the size of equipment is reduced.

Description

Pipeline corrosion measuring device

Technical Field

The invention relates to the technical field of pipeline corrosion measurement, in particular to a pipeline corrosion measuring device.

Background

The natural gas with high sulfur content contains components such as hydrogen sulfide and water, which can corrode a transmission pipeline and even cause pipeline perforation accidents in severe cases. In actual operation, the corrosion condition of the pipeline is known by measuring the wall thickness change of the pipeline, the weight change of the suspended corrosion piece and the like, so that preventive measures can be taken timely.

When the mode of measuring the wall thickness of the pipeline is adopted, if the wall thickness is measured by ultrasonic waves, a couplant needs to be coated on the outer wall of the pipeline, then a probe contacts with a thickness measuring point to take a value, the mode is simple to operate and high in measuring speed, but an instrument needs to be in contact with the wall surface of the pipeline during measurement, most pipelines are buried pipelines for long-distance natural gas pipelines, and the pipeline needs to be exposed through soil breaking operation by adopting the mode, so that the method is large in engineering quantity and is not suitable.

At present, for buried pipelines, a mode of hanging corrosion hanging pieces is usually adopted for measurement, namely a branch pipe is arranged on the buried pipeline, one end of the branch pipe extends out of the ground, the corrosion hanging pieces are placed into a buried gas conveying pipe through the branch pipe and are regularly taken out to measure the quality change of the corrosion hanging pieces, and because one end opening of the branch pipe is positioned on the ground, the operation on the ground can be carried out, the soil breaking operation is omitted, and the workload is relatively small. However, the gas pipe may be in operation when the hanging piece is taken and placed, so an isolation pipe section needs to be arranged on the branch pipe, as shown in fig. 1, the top of the branch pipe is provided with a lifting device which mainly drives the hanging piece to move up and down in the branch pipe so as to extend into and withdraw from the gas pipe; an isolation valve is arranged on the branch pipe between the gas pipe and the lifting device, a pipe section between the isolation valve and the lifting device is an isolation section, and a flange is arranged on the isolation section so as to place and take out the hanging piece after the isolation section is disassembled. When the device is used, the flange of the isolation section is firstly released, the hanging piece is fixed on the telescopic end of the lifting device, then the flange of the isolation section is connected, the isolation valve is opened to communicate the gas pipe with the isolation section, and the lifting device is actuated to place the hanging piece into the gas pipe. Although the method can be directly operated on the ground, in order to prevent the hanging piece from swinging in the gas transmission pipe and colliding with the pipeline to cause measurement distortion, the lifting component of the lifting device usually adopts a rigid rod, the hanging piece at the bottom of the rigid rod needs to be moved to the isolation section, and the whole rigid rod needs to be moved for a long distance and consumes long time; in order to enable the rigid rod to move for a long distance, the whole rigid rod needs to be long, please refer to fig. 2, which mainly needs to be in sealed connection between the rigid rod and the isolation section, when the rigid rod is lifted and lowered in a rotating thread mode, a thread section with a certain length needs to be matched outside the isolation chamber (the thread section cannot enter the isolation section, and the thread section cannot be sealed, the prior art adopts packing sealing, and the rigid rod pipe section entering and exiting the isolation section needs to be smooth), and the hanging piece needs to be moved from the gas pipe to the isolation section, so that at least the thread section with the same length needs to be matched, and thus, the whole rigid rod is long, and the equipment volume is large.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides a pipeline corrosion measuring device which adopts an integrated arrangement, wherein an isolating valve is arranged in a buried manner so as to be close to a buried main pipe, and the distance between the main pipe and an isolating chamber is shortened. The specific scheme of the invention is as follows:

a pipeline corrosion measuring device comprises a measuring pipe, wherein one end of the measuring pipe is communicated with a buried main pipe, and the other end of the measuring pipe is provided with a lifting driving structure; the measuring pipe is provided with a block valve, and a pipe section between the block valve and the lifting driving structure on the measuring pipe is an isolation chamber; the tail end of the lifting rod is fixed with a corrosion hanging piece, and the lifting driving structure is used for driving the lifting rod to lift along the measuring tube; the isolating valve comprises a valve seat and a valve core matched with the valve seat; the valve core is provided with a flow passage which penetrates through the valve core body, the lifting rod enters the flow passage and drives the corrosion hanging piece to move between the buried main pipe and the isolation chamber,

the isolating valve is a ball valve, and the valve core is positioned in the valve seat and is rotationally connected with the valve seat through a rotating shaft; the tail end of the lifting rod is provided with a rotating part which can do circular motion around the central line of the lifting rod; the rotating part passes in and out the runner along with the lifter, and when the rotating part bottom was arranged in the runner between lift drive structure and the pivot, the one end of rotating part then slided along the runner wall to rotatory rotating part, and the sliding in-process rotating part promotes the valve core and rotates to close, open the block valve.

For the present invention, the flow channel can be in various forms, such as an ellipsoid shape and a square shape, but when the flow channel is in a circular shape, care needs to be taken that the center line of the lifting rod cannot pass through the center of the valve core, otherwise, the rotating part cannot push the valve core to rotate when rotating.

The rotating part of the present invention has many forms, for example, the rotating part is a straight rod and is not parallel to the lifting rod, and the rotating part is connected to the lifting rod. In order to simplify the design process and reduce the size factor to be considered, the inventor has designed a new rotating part, which comprises a connecting rod and a vertical rod, wherein the vertical rod is parallel to the lifting rod; the connecting rod is perpendicular to the lifting rod, one end of the connecting rod is connected with the vertical rod, the other end of the connecting rod is connected with the lifting rod to form a Z shape, when the lifting rod is used, only the corrosion hanging piece at the bottom of the lifting rod needs to be noticed and is rotated after being moved out of the flow channel, and the lifting rod can be lifted to the distance and then rotated when the lifting rod is used after the lifting distance can be measured in advance.

Of course, in the above design, it is still necessary to consider that the corrosion hanging piece at the bottom of the lifting rod is located outside the flow channel to rotate the rotating part, otherwise, the corrosion hanging piece collides with the flow channel when the valve core rotates, and in order to move the corrosion hanging piece out of the flow channel more quickly to further save time, the inventor modifies the valve core as follows: cutting off one side of the valve core close to the lifting driving structure along the cross section of the flow channel to form a platform, wherein two stop blocks are arranged on the platform; the face that two dogs are relative communicates with the runner, becomes the partly of runner, when corroding the lacing film and be located between platform and the lift drive structure and the rotating part is located between two dogs, rotatory rotating part, the rotating part end slides along the dog wall this moment to promote the case and rotate.

The lifting of the lifting rod is very easy to realize, for example, the lifting of the valve rod of a conventional gate valve is adopted, which can refer to the background technical content and figure 2, but the invention requires that the rotating part at the bottom of the lifting rod can rotate, therefore, the invention improves the valve rod of the existing valve, the lifting rod comprises a threaded rod, the threaded rod is a hollow rod, the hollow rod is internally provided with an internal rod, two ends of the internal rod extend out of the threaded rod, one end of the internal rod is fixedly connected with the rotating part, the internal rod is connected with the lifting rod in a rotating and sealing way, the rotating part can be rotated by applying torque to one end of the internal rod, and the corrosion hanging piece is fixed at the tail end of the internal rod. The threaded rod is identical to the valve stem of a conventional valve, except that the valve stem is a hollow stem.

As an embodiment of the invention, the pipe section where the isolation chamber is located is detachably connected by two pipe sections, and the corrosion hanging piece can be taken and put after the pipe section is detached. Certainly, if the pipe section of the isolation chamber is not long, a branch pipe with a valve can be connected to the isolation chamber, and the corrosion hanging piece is taken out and placed in the isolation chamber by opening the valve, so that the time for disassembling the flange is saved, but the lifting length of the lifting rod is relatively longer.

Compared with the prior art, the method has the following advantages:

(1) the invention improves the traditional ball valve, and the improved ball valve can be opened and closed in a pipeline by utilizing the lifting rod.

(2) Based on the improvement to the ball valve, operating personnel can operate lifter switch ball valve on ground, consequently can bury the ground with the block valve and set up so that it presses close to and buries the ground and be responsible for, this has just greatly shortened and is responsible for and the distance between the isolation chamber to can remove the piece of hanging that corrodes between isolation chamber and the person in charge fast, practiced thrift the time of lift lifter, also reduced the length of screw thread section on the lifter simultaneously, reduced the total length of lifter, reduced the equipment size.

Drawings

FIG. 1 is a schematic view of a prior art suspended corrosion coupon apparatus;

FIG. 2 is a schematic view of a prior art lifting device for suspending a corrosion coupon;

FIG. 3 is a schematic view showing the operating state of the corrosion measuring apparatus of example 1;

fig. 4 is a schematic view of a block valve switch of embodiment 1;

FIG. 5 is a schematic view of the structure of a rotary part in embodiment 1;

FIG. 6 is a schematic structural view of a lifter of embodiment 1;

FIG. 7 is a schematic view of the rotary sealing connection structure of the built-in rod and the threaded rod of embodiment 1;

fig. 8 is a schematic structural view of the elevation drive structure of embodiment 1;

FIG. 9 is a schematic structural view of an isolation valve of embodiment 2;

FIG. 10 is a schematic view of the isolation valve spool configuration of embodiment 2;

in the figure, a gas pipe 1-1, a lifting device 1-2, an isolating valve 1-3, a flange 1-4, an isolating section 1-5, a rigid rod 1-6, a threaded section 1-7, a valve body,

A measuring pipe 1, a buried main pipe 2, a lifting driving structure 3, a block valve 4, an isolation chamber 5, a lifting rod 6, a corrosion hanging piece 7,

Sealing part 31, stopper 32, hand wheel rotating part 33, valve seat 41, valve body 42, rotating part 61, threaded rod 62, built-in rod 63, sleeve 81, packing ring 82, press ring 83, and seal ring,

Runner 421, platform 422, dog 423, connecting rod 611, vertical rod 612, threaded section 621, spacing section 622, smooth section 623, annular ring 811.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

In the description of the present invention, it is to be noted that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and should not be construed as limiting the present invention.

Example 1

Referring to fig. 3, fig. 3 is a schematic view illustrating an operating state of the corrosion measuring apparatus of the present embodiment. A pipeline corrosion measuring device comprises a measuring pipe 1, wherein one end of the measuring pipe 1 is communicated with a buried main pipe 2, and the other end of the measuring pipe 1 is provided with a lifting driving structure 3; the measuring pipe is provided with a block valve 4, and a pipe section between the block valve 4 and the lifting driving structure 3 on the measuring pipe is an isolation chamber 5; the tail end of the lifting rod 6 is fixedly provided with a corrosion hanging piece 7, and the lifting driving structure 3 is used for driving the lifting rod 6 to lift along the measuring pipe 1, so that the corrosion hanging piece 7 is driven to move between the buried main pipe 2 and the isolation chamber 5. The isolation chamber 5 is connected with a pressure release valve and a pressure gauge (not shown in the figure) and used for releasing pressure to the isolation chamber 5 after the isolating valve 4 is closed; the lifting driving structure 3 is connected with the measuring tube 1 in a sealing way through a flange, so that the isolating chamber 5 can be conveniently disassembled to take and place the corrosion hanging piece 7.

Referring to fig. 4, fig. 4 is a schematic diagram of a closing valve switch of the present embodiment. The closing valve 4 is a ball valve and comprises a valve seat 41 and a valve core 42 matched with the valve seat 41, wherein the valve core 42 is positioned in the valve seat 41 and is rotatably connected with the valve seat 41 through a rotating shaft (not shown in the figure); and a flow channel 421 penetrating through the valve core body is arranged on the valve core 42, and the lifting rod 6 enters and exits the flow channel 421 so as to drive the corrosion hanging piece 7 to move between the buried main pipe 2 and the isolation chamber 5. The tail end of the lifting rod 6 is provided with a rotating part 61, and the rotating part 61 can do circular motion around the central line of the lifting rod 6; the rotating part 61 enters and exits the flow passage 421 along with the lifting rod 6, when the bottom of the rotating part 61 is located in the flow passage 421 between the lifting driving structure 3 and the rotating shaft, one end of the rotating part 61 slides along the wall surface of the flow passage 421, and the rotating part 61 pushes the valve core 42 to rotate around the rotating shaft in the sliding process, so that the block valve 4 is closed and opened.

For the present invention, the flow passage 421 may have various forms, such as oval and square, but when the flow passage is circular, it should be noted that the center line of the lifting rod cannot pass through the center of the valve core, otherwise the rotating part cannot push the valve core to rotate when rotating. In this embodiment, the flow passage 421 is elliptical, and the opening at the lower portion of the base 41 is also elliptical, so that the closing valve 4 can be closed by rotating the valve core 42 by a small angle. This makes it possible to reduce the turning radius of the rotary portion 61, thereby reducing the torque required to rotate the lifting lever 6.

Referring to fig. 4 and 5, fig. 5 is a schematic structural diagram of the rotating portion in the present embodiment. The rotating part 61 includes a connecting rod 611 and a vertical rod 612, the vertical rod 612 being parallel to the lifting rod 6; the connecting rod 611 is perpendicular to the lifting rod 6, one end of the connecting rod 611 is connected with the vertical rod 612, the other end of the connecting rod 611 is connected with the tail end of the lifting rod 6, a Z shape is formed, when the lifting device is used, only the corrosion hanging piece 7 at the bottom of the lifting rod 6 is required to be moved out of the flow channel 421 and then rotated, and when the lifting device is used, the lifting rod 6 can be lifted to the distance in advance and then rotated.

The lifting of the lifting rod is very easy to realize, for example, the lifting driving structure adopts a lifting driving structure of a valve rod of a conventional gate valve, but the lifting driving structure requires that a rotating part at the bottom of the lifting rod can rotate, so that the lifting driving structure improves the valve rod of the existing valve, and particularly, the lifting driving structure is equivalent to that a long rod is sleeved in the valve rod of the existing valve, the long rod is in rotating and sealing connection with the valve rod, and the rotating part at the bottom of the long rod is rotated by rotating the long rod. I will now describe with reference to specific configurations.

Referring to fig. 6, fig. 6 is a schematic structural view of the lifting rod. The lifting rod 6 comprises a threaded rod 62, the threaded rod 62 is a hollow rod, a built-in rod 63 is sleeved in the hollow rod, two ends of the built-in rod 63 extend out of the threaded rod 62, one end of the built-in rod 63 is fixedly connected with the rotating part 61, the corrosion hanging piece 7 is also fixed at the tail end of the built-in rod 63, the built-in rod 63 is connected with the lifting rod 6 in a rotating and sealing mode, and the rotating part can be rotated by applying torque to one end of the built-in rod 63 to rotate the built-in rod 63.

Referring to fig. 7, the sealing structure includes a sleeve 81, a packing ring 82, and a pressing ring 83, which are all hollow and coaxially disposed. An annular ring 811 is arranged on the inner wall of the sleeve 81, the packing ring 82 is positioned in the hollow part of the sleeve 81, one end of the packing ring presses the annular ring 811, the pressing ring 83 is in threaded connection with the inner wall of the sleeve 81, and one end of the pressing ring presses the packing; the top of the threaded rod 62 is coaxially and fixedly connected with the sleeve 81, and one end of the built-in rod 63 sequentially penetrates through the press ring 83, the packing ring 82, the sleeve 81 and the threaded rod 62. The packing ring 82 is pressed by rotating the pressing ring 83, so that the packing ring 82 fully seals an annular gap between the sleeve 81 and the built-in rod 63, and the purpose of sealing the built-in rod 63 and the threaded rod 62 is achieved.

Referring to fig. 6 and 8, fig. 8 is a schematic structural diagram of the lifting driving structure. The threaded rod 62 is coaxially connected with a threaded section 621, a limiting section 622 and a smooth section 623 in sequence from top to bottom. The outer wall of the threaded section 621 is provided with external threads and is used for being matched with a hand wheel to lift, the outer wall of the limiting section 622 is provided with a limiting pin along the axial direction, and the outer wall of the smooth section 623 is smooth.

The threaded rod 62 is inserted into the elevation drive mechanism 3. The lifting driving structure 3 comprises a sealing part 31, a limiting part 32 and a hand wheel rotating part 33 which are connected in sequence. The specific structure of the sealing part 31 can refer to the sealing structure between the front built-in rod and the threaded rod, wherein the smooth section 623 is inserted into the sealing part 31, and the gap between the smooth section and the sleeve can be sealed by compressing the press ring; the lower portion of the sealing portion 31 is connected to the measuring pipe 1 by a flange. The limiting part 32 is a hollow structure, and the inner wall of the limiting part is provided with a limiting notch (not shown) matched with the limiting pin 6221 along the axial direction, the limiting section 622 is connected with the limiting part 32 through the pin slot after being inserted into the limiting part, and the limiting threaded rod can only move axially and cannot rotate. The threaded section 621 is inserted into the hand wheel rotating section 32, and the threaded rod can be raised and lowered by rotating the hand wheel.

Example 2

In embodiment 2, the valve body of the isolation valve 4 is modified from that of embodiment 1, and other components are the same. The modification of the valve cartridge will now be described.

Referring to fig. 9, fig. 9 is a schematic structural diagram of an isolation valve according to the embodiment, and fig. 10 is a schematic structural diagram of a valve element of the isolation valve according to the embodiment. Cutting off one side of the valve core 42 close to the lifting driving structure 3 along the cross section of the flow channel 421 to form a platform 422, and arranging two stop blocks 423 on the platform 422; the surfaces of the two stoppers 423 facing each other communicate with the flow path 421 to form a part of the flow path 421, and when the corrosion hanging piece is positioned between the platform 422 and the elevation driving mechanism 3 and the rotating portion 61 is positioned between the two stoppers 423, the rotating portion 61 is rotated, and at this time, the end of the rotating portion 61 slides along the wall surface of the stopper 423 to rotate the valve body 42.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A pipeline corrosion measuring device comprises a measuring pipe, wherein one end of the measuring pipe is communicated with a buried main pipe, and the other end of the measuring pipe is provided with a lifting driving structure; the measuring pipe is provided with a block valve, and a pipe section between the block valve and the lifting driving structure on the measuring pipe is an isolation chamber; the lifting driving structure is used for driving the lifting rod to lift along the measuring tube, and the tail end of the lifting rod is fixed with the corrosion hanging piece; the isolating valve comprises a valve seat and a valve core matched with the valve seat; the valve core is provided with a flow passage which penetrates through the valve core body, the lifting rod enters and exits the flow passage so as to drive the corrosion hanging piece to move between the buried main pipe and the isolation chamber,

the isolating valve is a ball valve, and the valve core is positioned in the valve seat and is rotationally connected with the valve seat through a rotating shaft; the tail end of the lifting rod is provided with a rotating part which can do circular motion around the central line of the lifting rod; the rotating part passes in and out the runner along with the lifter, and when the bottom of the rotating part is positioned in the runner between the lifting driving structure and the rotating shaft, one end of the rotating part slides along the wall surface of the runner by rotating, and the rotating part pushes the valve core to rotate around the rotating shaft in the sliding process, so that the isolating valve is closed and opened.

2. The pipeline corrosion measuring device of claim 1, wherein the rotating part comprises a connecting rod and a vertical rod, and the vertical rod is parallel to the lifting rod; the connecting rod with the lifter is perpendicular and the one end of connecting rod is connected with vertical pole, the other end with the lifter is connected, forms the Z style of calligraphy.

3. The pipeline corrosion measuring device according to claim 1, wherein a platform is formed by cutting off one side of the valve core close to the lifting driving structure along the cross section of the flow channel, and two stop blocks are arranged on the platform; the opposite surfaces of the two blocks are communicated with the flow passage to form a part of the flow passage.

4. The pipeline corrosion measuring device according to any one of claims 1 to 3, wherein the lifting rod comprises a threaded rod, the threaded rod is a hollow rod, a built-in rod is arranged in the hollow rod, two ends of the built-in rod extend out of the threaded rod, one end of the built-in rod is fixedly connected with the rotating part, the built-in rod is rotatably and hermetically connected with the threaded rod, the rotating part can be rotated by applying torque to one end of the built-in rod to rotate the built-in rod, and the corrosion hanging piece is fixed at the tail end of the built-in rod; the threaded rod is equivalent to the valve stem of a conventional gate valve.

5. The pipeline corrosion measuring device according to claim 1, wherein the pipe section in which the isolation chamber is located is detachably connected by two pipe sections, and the corrosion hanging piece can be taken and placed after the pipe section is detached.

6. A pipeline corrosion measuring device according to claim 5, wherein said detachable connection is a flanged connection.