CN114593221B - Online isolation method for gas pipeline - Google Patents
Online isolation method for gas pipeline Download PDFInfo
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- CN114593221B CN114593221B CN202210152427.8A CN202210152427A CN114593221B CN 114593221 B CN114593221 B CN 114593221B CN 202210152427 A CN202210152427 A CN 202210152427A CN 114593221 B CN114593221 B CN 114593221B
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- box body
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- plate
- gas
- inert gas
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- 238000002955 isolation Methods 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 62
- 239000011261 inert gas Substances 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0281—Guillotine or blade-type valves, e.g. no passage through the valve member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/12—Covers for housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/312—Line blinds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to an online isolation method of a gas pipeline, which comprises the following steps: 1. in the process of assembling the sealed box body, positioning the gas pipelines in the pipeline positioning holes, arranging the connecting flange parts of the two gas pipelines in the sealed box body, pressing the two flange parts of the gas pipelines against the throttle plate through the pipeline flange part clutch mechanism, and loosening bolts connecting the flanges at two sides; 2. starting an inert gas circulation system, and carrying out inert gas replacement on the inside of the box body to ensure that the pressure of inert gas in the box body is larger than the gas pressure in the gas pipeline; 3. the gas pipeline flange part on one side is pulled away by the pipeline flange part clutch mechanism, so that the distance between the flange parts on two sides is larger than the thickness of the throttle plate; 4. replacing the throttle orifice plate with a blind plate through a plate replacing operation rod; 5. the two flange parts of the gas pipeline are tightly pressed against the blind plates through the pipeline flange part clutch mechanism; 6. in the process of disassembling the sealed box body, bolts connected with flanges at two sides are fastened, and online isolation of the gas pipeline is completed. The invention avoids the overflow of the pipeline gas.
Description
Technical Field
The invention belongs to the technical field of low-temperature storage tanks, and particularly relates to an online isolation method for a gas pipeline.
Background
After the low-temperature storage tank runs for a period of time, maintenance is required for various reasons, the front end of the maintenance position is required to be isolated before maintenance (the flow orifice plate between two pipelines is replaced by a blind plate), and the front end of the maintenance position is required to be restored after the maintenance is finished (the blind plate is replaced by the flow orifice plate).
The method adopted at present is to reduce the pressure in the low-temperature storage tank to about 5KPa, manually open the flange, replace the orifice plate with a blind plate, and recover the blind plate.
In the whole process: firstly, the pressure in the low-temperature storage tank needs to be reduced, so that the loss and waste of medium in the storage tank are caused; and the second gas (low-temperature gas, harmful gas or low-temperature harmful gas and the like) overflows along the pipeline in the flange opening process, so that safety accidents are easy to occur.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an online gas pipeline isolation method which is easy to realize, does not need to reduce the pressure of gas in a pipeline and can avoid the overflow of the gas in the pipeline.
The above object of the present invention is achieved by the following technical solutions:
an on-line isolation method for a gas pipeline is characterized by comprising the following steps of: the method is based on a set of online isolation device, and the online isolation device mainly comprises a sealed box body, an inert gas circulation system, a plate changing operation rod and a pipeline flange part clutch mechanism; the sealing box body is of a split type combined structure; an inert gas inlet and an inert gas outlet are formed in the wall of the box body and are connected with an external gas supply system to form an inert gas circulation system, the plate-changing operating rod penetrates through the top of the sealed box body, universal rotation and up-and-down movement can be realized, and a hook head is arranged at the lower end of the operating rod; the lower side wall of the sealing box body is provided with a pipeline positioning hole for sealing and clamping the gas pipeline, so that the flange connection part of the gas pipeline is arranged in the sealing box body; the method comprises the following steps:
step 1, positioning a gas pipeline in a pipeline positioning hole in the process of assembling a sealed box body, arranging connecting flange parts of two gas pipelines in the sealed box body, enabling the two flange parts of the gas pipelines to press a throttle plate through a pipeline flange part clutch mechanism, and finally loosening bolts for connecting flanges at two sides;
step 2, starting an inert gas circulation system, carrying out inert gas replacement on the inside of the box body, and adjusting the pressure of the inert gas in the box body to enable the pressure of the inert gas in the box body to be larger than the pressure of the gas in the gas pipeline;
step 3, pulling away the gas pipeline flange part on one side through a pipeline flange part clutch mechanism, so that the distance between the flange parts on two sides is larger than the thickness of the throttle plate;
step 4, plate replacement:
taking out the throttling orifice plates between the flanges at the two sides of the gas pipeline through a plate-changing operation rod, placing the throttling orifice plates in orifice plate positioning grooves preset in the upper space in the sealed box body, and then sending blind plates placed in blind plate positioning grooves preset in the upper space in the sealed box body to between the flanges at the two sides of the gas pipeline through the plate-changing operation rod;
step 5, pressing the blind plates by two flange parts of the gas pipeline through a pipeline flange part clutch mechanism;
and 6, in the process of disassembling the sealed box body, fastening bolts connected with flanges at two sides, and completing on-line isolation of the gas pipeline.
Further: the sealing box body comprises an upper box body, a middle box body and a lower box body; the upper box body, the middle box body and the lower box body are fixedly and hermetically connected in a mode of communicating internal gas; a transparent observation port is arranged at the side part of the upper box body; an inert gas inlet and an inert gas outlet are arranged at the top of the upper box body, and a pressure gauge, a safety valve and a plate-changing early acting seat are arranged at the top of the upper box body; a hole plate and blind plate up-and-down moving space is arranged between the hole plate positioning groove and the blind plate positioning groove in the box body; the lower half round holes are formed in the two sides of the lower end of the middle box body relatively, the lower half round holes are formed in the two sides of the upper end of the lower box body relatively, and the upper half round holes and the lower half round holes on the two sides are matched to form a pipeline positioning hole.
Further: the plate-changing operation rod is arranged on a ball head in a penetrating mode in an up-down movable mode, the ball head is matched with a ball socket arranged on a plate-changing operation rod seat in a ball hinge mode, and the lower portion of the plate-changing operation rod stretches into the upper box body.
Further: the pipeline flange part clutch mechanism is composed of four groups of push-pull rods, the four groups of push-pull rods are arranged on the same side wall of the middle and lower box body in a penetrating mode and are positioned at four corners of the periphery of the pipeline positioning hole, and flange clamping heads acting on the pipeline flange are arranged at the inner ends of the push-pull rods.
The invention has the advantages and positive effects that:
1. before the throttle plate is replaced, the flange connection part of the pipeline is arranged in a sealed box body, air in the box body is replaced by circulation of inert gas, and the internal gas pressure of the box body is adjusted to be larger than the gas pressure in the gas pipeline.
2. The plate-changing operating rod adopted by the method can move up and down and rotate in a plane in a universal way, so that the interchange operation of the throttle orifice plate and the blind plate in the valve box can be conveniently realized by operating the operating rod outside the sealed box body.
Drawings
FIG. 1 is a front view of an in-line isolation device employed in the method of the present invention;
FIG. 2 is a perspective view of an in-line isolation device employed in the method of the present invention;
FIG. 3 is a perspective view of an in-line isolation device employed in the method of the present invention in a cut-away section of a tank.
Detailed Description
The structure of the present invention will be further described by way of examples with reference to the accompanying drawings. It should be noted that the present embodiments are illustrative and not restrictive.
An on-line isolation method for a gas pipeline, which is based on a set of on-line isolation devices, and the on-line isolation devices are shown in fig. 1-3, and mainly comprise: the device comprises a sealed box body 2, an inert gas circulation system, a plate changing operation rod 1 and a pipeline flange part clutch mechanism.
The seal box body is of a split type combined structure and comprises an upper box body 2.1, a middle box body 2.2 and a lower box body 2.3, wherein outer edge annular edges are arranged at the lower end of the upper box body, the upper end and the lower end of the middle box body and the upper end of the lower box body, bolt holes are formed in the outer edge annular edges, the lower end of the upper box body is fixedly connected with the upper end of the middle box body, the lower end of the middle box body and the upper end of the lower box body through bolts which are connected to the corresponding outer edge annular edges, sealing rings are arranged between the matched outer edge edges, and the upper box body, the middle box body and the lower box body are fixedly and hermetically connected in an internal gas communication mode. Transparent observation ports 10 are provided at a plurality of positions on the side of the upper case. In the process of plate changing operation, an operator can clearly observe the position between the hook head of the operation rod for plate changing and the hook hole on the pore plate or the blind plate through the transparent observation port, so that the hook head can be smoothly hooked into the hook hole.
An inert gas inlet 4 and an inert gas outlet 9 are provided at the top of the upper case for respectively introducing inert gas and outputting inert gas, such as nitrogen, to effect replacement of the inert gas inside the case. The inert gas inlet and the inert gas outlet are respectively externally connected with an inert gas input pipeline and an inert gas output pipeline, and are provided with control valves, and the input quantity and the output quantity of the inert gas are controlled through the two control valves, so that the control of the pressure of the inert gas in the box body is realized. The top of the upper box body is also reserved with a pressure gauge mounting port 5, a safety valve mounting port 8 and a plate-changing operation rod seat mounting port 7 which are respectively used for mounting a pressure gauge, a safety valve and a plate-changing operation rod. The pressure gauge is used for displaying the pressure of the inert gas in the box body so as to assist in controlling the pressure of the inert gas in the box body, the safety valve is used for guaranteeing the safety of the box body, and when the pressure in the box body is too high, the safety valve is opened to release the pressure.
Two sides of the bottom in the upper box body, which are positioned at the corresponding positions of the plate changing operation rods, are respectively provided with a pore plate positioning groove 14 and a blind plate positioning groove 13, and the two positioning grooves can adopt a combination form of a left vertical baffle plate and a right vertical baffle plate shown in the figure 3. And a hole plate and blind plate up-and-down moving space is arranged between the two positioning grooves, and the replacement of the throttle hole plate and the blind plate is realized through the space.
The plate-changing operation rod seat is hermetically arranged at the mounting opening of the plate-changing operation rod seat at the top of the upper box body, and the plate-changing operation rod seat is provided with a ball socket matched with the plate-changing operation rod. The plate-changing operation rod is vertically movably arranged on a ball head 6 in a penetrating mode, the ball head is matched with a ball socket arranged on a plate-changing operation rod seat in a ball hinge mode, the lower part of the plate-changing operation rod stretches into the upper box body, a hook head 1.1 is arranged at the lower end of the plate-changing operation rod and used for hooking the pore plate and the blind plate 200 in sequence, plate-changing operation is achieved, only the blind plate is shown in the drawing, the structure of the pore plate is consistent with that of the blind plate, and the difference point is that an overflow hole is arranged on the pore plate.
The lower half round holes of well, lower box are equipped with the semicircle orifice relatively in the lower extreme both sides, the upper end both sides of lower box are equipped with the semicircle orifice relatively, and the cooperation of the semicircle orifice constitutes the pipeline locating hole about well, lower box, makes the inside of well box and lower box form the board and changes the operation chamber. Before the operation of replacing the throttle orifice plate with the blind plate, the connecting flange part of the pipeline is required to be arranged inside the middle box body and the lower box body, so that the throttle orifice plate part is aligned with the up-down moving space of the plate replacing operation rod above, wherein the pipeline positioning holes on two sides of the box body are used for positioning the two pipelines, and the pipeline positioning holes and the pipeline surface are required to ensure sealing and pressing contact.
A group of push-pull rods 3 are respectively and hermetically penetrated at four corners of the periphery of the corresponding pipeline positioning holes on the outer walls of the same side of the middle box body and the lower box body to form the pipeline flange part clutch mechanism. Specifically, a rod sleeve 11 is welded at a position corresponding to each group of push-pull rods outside the side wall of the middle box body and outside the side wall of the lower box body, the outer protruding part of the push-pull rod is inserted into the rod sleeve, and a mechanical sealing element is arranged between the two. The outer end of the push-pull rod extends out of the outer end of the rod sleeve to form a rotary force application section of the push-pull rod, and the end can adopt a square head structure 3.1 shown in the attached drawing, so that the clamping of a wrench is facilitated. In addition, in order to realize the push-pull operation of the push-pull rod, a hollowed design is made at the position, close to the outer end, of each rod sleeve, a nut mounting groove is formed, a nut 12 is arranged in the nut mounting groove, the nut and the push-pull rod form threaded connection, and through rotating the nut, the axial movement of the push-pull rod can be realized, so that the push-pull function is realized.
The push-pull rods of each group are provided with a flange clamping head 3.2 at the position close to the inner end, and the flange clamping head is used for pressing two flanges on a pipeline and separating the two flanges from a certain distance by pulling apart one side flange in different operation steps. Two parallel round baffles are arranged at the position of each group of push-pull rods close to the inner end, the distance between the two round baffles is slightly larger than the thickness of the flange at the end part of the pipeline, flat milling surfaces are oppositely arranged on the two round baffles, and the two round baffles form a flange clamping head.
The invention relates to an on-line isolation method for a gas pipeline, which comprises the following steps:
step 1, placing the flange connection part of the pipeline 100 in a plate changing operation cavity of a middle box body and a lower box body, wherein the process is as follows:
firstly, placing a middle box body above a pipeline, contacting the upper wall of the pipeline through upper semicircular holes on two sides, and centering with an orifice plate; then the lower box body is placed from below, the lower semicircular holes on the two sides are contacted with the lower wall of the pipeline, and the middle box body is aligned with the lower box body and connected with the lower box body through bolts; then, adjusting a plurality of groups of push-pull rods, compressing the flange 101 at the end part of the pipeline through an adjusting nut, and loosening bolts connected with the flanges at the two sides; finally, an upper box body is installed, and the upper box body is fixedly connected with the middle box body through bolts after being aligned.
Step 2, opening an inert gas outlet and an inert gas inlet, and performing inert gas replacement on the inside of the box body;
step 3, determining the pressure of the gas in the pipeline (the pressure is provided by the central control room), and adjusting the pressure of the gas in the box by adjusting the air inflow and the air outflow of the inert gas so that the pressure of the gas in the box is larger than the pressure of the gas in the pipeline;
step 4, performing blind plate replacement operation on the throttle orifice plate:
firstly, adjusting nuts to pull out a plurality of groups of push-pull rods, and pulling the pipeline flanges at the corresponding sides out; then taking out the throttle orifice plate through a plate-changing operating rod, lifting the throttle orifice plate and placing the throttle orifice plate at the position of the orifice plate positioning groove; then, through changing the operating lever of the board, will put the blind board in blind board locating slot to send to the middle of the flange of pipeline, then adjust the nut multiunit push-pull rod to compress the flange part of the correspondent side pipeline, make the blind board compress between flanges of both sides; finally, the bolts of the flanges on the two sides are fastened after the upper box body is removed, and finally, the lower box body and the middle box body are removed, so that the whole operation of replacing the blind plate by the throttle orifice plate is completed.
Wherein, trade specific use of board action bars does: in the process of plate changing operation, the plate changing operation is used as a rod to move downwards, the hook hole on the throttle orifice plate is hooked through the hook head of the operation rod, then the plate changing operation rod moves upwards, the throttle orifice plate is taken out from the pipeline flange, the throttle orifice plate is placed in the orifice plate positioning groove, then the hook head of the operation rod on the plate changing operation rod and the hook hole on the throttle orifice plate fall off, then the plate changing operation rod is rotated, the hook head of the operation rod is matched with the hook hole on the blind plate placed in the blind plate positioning groove, after the blind plate is lifted, the blind plate is moved downwards through the up-down movement space between the two positioning grooves, the blind plate is inserted between the pipeline flange, and the orifice plate is replaced by the blind plate.
After the overhaul is completed, the process of replacing the blind plate with the throttle plate is the same as the process of replacing the throttle plate with the blind plate, and the description is omitted here.
Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments and the disclosure of the drawings.
Claims (4)
1. An on-line isolation method for a gas pipeline is characterized by comprising the following steps of: the method is based on a set of online isolation device, and the online isolation device mainly comprises a sealed box body, an inert gas circulation system, a plate changing operation rod and a pipeline flange part clutch mechanism; the sealing box body is of a split type combined structure; an inert gas inlet and an inert gas outlet are formed in the wall of the box body and are connected with an external gas supply system to form an inert gas circulation system, the plate-changing operating rod penetrates through the top of the sealed box body, universal rotation and up-and-down movement can be realized, and a hook head is arranged at the lower end of the operating rod; the lower side wall of the sealing box body is provided with a pipeline positioning hole for sealing and clamping the gas pipeline, so that the flange connection part of the gas pipeline is arranged in the sealing box body; the method comprises the following steps:
step 1, positioning a gas pipeline in a pipeline positioning hole in the process of assembling a sealed box body, arranging connecting flange parts of two gas pipelines in the sealed box body, enabling the two flange parts of the gas pipelines to press a throttle plate through a pipeline flange part clutch mechanism, and finally loosening bolts for connecting flanges at two sides;
step 2, starting an inert gas circulation system, carrying out inert gas replacement on the inside of the box body, and adjusting the pressure of the inert gas in the box body to enable the pressure of the inert gas in the box body to be larger than the pressure of the gas in the gas pipeline;
step 3, pulling away the gas pipeline flange part on one side through a pipeline flange part clutch mechanism, so that the distance between the flange parts on two sides is larger than the thickness of the throttle plate;
step 4, plate replacement:
taking out the throttling orifice plates between the flanges at the two sides of the gas pipeline through a plate-changing operation rod, placing the throttling orifice plates in orifice plate positioning grooves preset in the upper space in the sealed box body, and then sending blind plates placed in blind plate positioning grooves preset in the upper space in the sealed box body to between the flanges at the two sides of the gas pipeline through the plate-changing operation rod;
step 5, pressing the blind plates by two flange parts of the gas pipeline through a pipeline flange part clutch mechanism;
and 6, in the process of disassembling the sealed box body, fastening bolts connected with flanges at two sides, and completing on-line isolation of the gas pipeline.
2. The gas pipeline online isolation method according to claim 1, wherein: the sealing box body comprises an upper box body, a middle box body and a lower box body; the upper box body, the middle box body and the lower box body are fixedly and hermetically connected in a mode of communicating internal gas; a transparent observation port is arranged at the side part of the upper box body; an inert gas inlet and an inert gas outlet are arranged at the top of the upper box body, and a pressure gauge, a safety valve and a plate changing operation rod seat are arranged at the top of the upper box body; a hole plate or blind plate up-and-down moving space is arranged between the hole plate positioning groove and the blind plate positioning groove in the box body; the lower half round holes of the middle and lower box bodies are matched to form the pipeline positioning holes.
3. The gas pipeline online isolation method according to claim 2, wherein: the plate-changing operation rod is arranged on a ball head in a penetrating mode in an up-down movable mode, the ball head is matched with a ball socket arranged on the operation rod seat in a ball hinge mode, and the lower portion of the plate-changing operation rod stretches into the upper box body.
4. The gas pipeline online isolation method according to claim 2, wherein: the pipeline flange part clutch mechanism is composed of four groups of push-pull rods, the four groups of push-pull rods are arranged on the same side wall of the middle and lower box body in a penetrating mode and are positioned at four corners of the periphery of the pipeline positioning hole, and flange clamping heads acting on the pipeline flange are arranged at the inner ends of the push-pull rods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152427.8A CN114593221B (en) | 2022-02-18 | 2022-02-18 | Online isolation method for gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152427.8A CN114593221B (en) | 2022-02-18 | 2022-02-18 | Online isolation method for gas pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114593221A CN114593221A (en) | 2022-06-07 |
| CN114593221B true CN114593221B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210152427.8A Active CN114593221B (en) | 2022-02-18 | 2022-02-18 | Online isolation method for gas pipeline |
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| CN (1) | CN114593221B (en) |
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| CN207674020U (en) * | 2017-12-08 | 2018-07-31 | 中国石油天然气第一建设有限公司 | A kind of multifunctional oil gas blind plate |
| CN109519642A (en) * | 2019-01-22 | 2019-03-26 | 邢培永 | High-risk gas piping isolation service chamber with pressure |
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2022
- 2022-02-18 CN CN202210152427.8A patent/CN114593221B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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