CN113932081A - Plugging method for gas pipeline partition operation - Google Patents
Plugging method for gas pipeline partition operation Download PDFInfo
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- CN113932081A CN113932081A CN202111304814.0A CN202111304814A CN113932081A CN 113932081 A CN113932081 A CN 113932081A CN 202111304814 A CN202111304814 A CN 202111304814A CN 113932081 A CN113932081 A CN 113932081A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005192 partition Methods 0.000 title claims abstract description 19
- 230000000903 blocking effect Effects 0.000 claims abstract description 10
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 48
- 238000010079 rubber tapping Methods 0.000 claims description 47
- 239000007789 gas Substances 0.000 claims description 41
- 229910052757 nitrogen Inorganic materials 0.000 claims description 24
- 238000005553 drilling Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 15
- 239000010985 leather Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 6
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- 238000012360 testing method Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000012535 impurity Substances 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- 210000002445 nipple Anatomy 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/04—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/1018—Pivoting closing devices
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/105—Closing devices introduced radially into the pipe or hose
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a plugging method for gas pipeline partition operation, and relates to the technical field of pipeline plugging. The adopted foldable plugging device has small opening diameter which is far lower than the pipe diameter of the gas stopping pipeline, so that the safety of the plugging operation of the large-scale pipeline is improved; meanwhile, the size of the part of the folding type plugging head can be adjusted to flexibly adapt to the change of the diameter of the pipeline. Compared with a single plugging technology, the gas medium cannot be completely cut off due to impurities deposited in the pipeline and the problem of the attachment of the plugging head and the edge of the pipeline. And after the primary separation of high-pressure gas is finished by adopting the blocking and blind plate combined technology, the medium can be thoroughly cut off, and necessary guarantee is provided for the safety of each operation of the rear section. The invention can quickly solve the problem that the large-diameter gas pipeline effectively cuts off gas under the condition of no cut-off valve, provides an effective technical mode no matter the front-end user is ensured not to be influenced in production, or the rear end is ensured to be stopped for emergency rescue or maintenance operation, and has better reference value.
Description
Technical Field
The invention relates to the technical field of pipeline plugging, in particular to a plugging method for gas pipeline partition operation.
Background
Various coal gases are additionally produced in the process of smelting steel by iron and steel enterprises, and the coal gases are treated from a generating source and then are sent to various users for use through a coal gas pipeline, a middle partition valve and a branch pipe.
The physical and chemical properties of coal gas are inflammable, explosive and easy to be poisoned. The gas pipe networks of many steel companies in China are complicated, and valves on the gas pipes can not be closed tightly due to the fact that the valves are not moved for many years and the gas contains more impurities. In addition, when a local gas pipeline is in failure, a valve is not arranged right nearby, and the continuous closing of the upstream valve can further expand the gas stopping range, so that the production is seriously influenced. Therefore, the high-risk gas blind plate operation under pressure is a necessary choice, and personal injury accidents such as over-ignition, explosion, poisoning and the like are encountered when the gas blind plate operation under pressure is carried out in the industry. The problems can be efficiently and safely solved by introducing the gas pipeline folding type plugging combined with the blind plate operation technology.
Therefore, the applicant inherits the experience of abundant design development and actual manufacturing of the related industry for many years, researches and improves the existing structure and deficiency, and provides a plugging method for gas pipeline partition operation so as to achieve the aim of higher practical value.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a plugging method for gas pipeline partition operation, which solves the problem that when a local gas pipeline breaks down, a valve is not arranged right nearby, and the gas stop range is further expanded due to the fact that the upstream valve is continuously closed, so that the production is seriously influenced.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the foldable plugging system is used for performing hole opening and lower end sealing operations on a gas pipeline, and after the gas in the pipeline is primarily plugged, blind plate operations are performed at a flange behind an air source cut-off point, so that the gas is reliably cut off.
The folding type plugging system mainly comprises a folding type plugging device, a hydraulic tapping machine, a cylinder cutter, a tapping adapter, a plugging tee joint, a sandwich valve, a hydraulic station, a blind plate and the like.
The basic principle is as follows: under the state of conveying a pipeline system under pressure, welding a plugging tee joint at the fault side of a pipeline section needing maintenance, rush repair and reconstruction, installing a sandwich valve, installing a tapping adapter on the sandwich valve, and finally connecting a hydraulic tapping machine to hermetically process a circular hole with unequal diameters vertical to a fault pipeline in a mechanical cutting mode. After the hole is opened, the hydraulic hole opener is taken down, the folding plugging device is installed, the folding plugging heads are sent into the pipeline from top to bottom from the pipeline plugging hole, the three sections of folding plugging heads are opened by utilizing hydraulic pressure to block the medium flowing in the main pipeline, and after the plugging is detected to be effective behind the plugging point, the medium in the pipeline is diffused, the blind plate operation is implemented, and the medium is completely blocked. After the construction of the rear-section pipeline is completed, firstly, the blind plate is removed, then the folding type plugging head is removed, the plugging cover plate is installed, and the normal conveying of the pipeline is recovered.
1. The folding stopper comprises the following components:
hydraulic plugging machines, plugging adapters, folding plugging heads, blind plates and the like.
2. The structure of the folding plugging head is as follows:
the folding plugging head comprises a plugging head seat body, a rocker arm, a guide wheel, a diagonal draw bar, a middle fixed pressing plate, a left side folding plate, a right side folding plate, a sealing leather cup and the like. The plugging leather cups are respectively clamped between the front pressing plate and the rear pressing plate, and the fixed pressing plate and the folding pressing plates at the two sides form a revolute pair.
3. The basic working principle is as follows:
the folding plugging device inserts a folding plugging head into a pipeline through a hole with unequal diameters and is completely opened to temporarily block the flow of media in the pipeline. The hydraulic plugging machine is used for hoisting the folding plugging head, and the lower end of the hydraulic plugging machine is connected with the plugging connector; the folding plugging head is divided into three sections in the vertical direction, the sealing leather cup is clamped on the folding plugging head, and due to gravity, the pressing plate part of the plugging head naturally sags and can be contracted under the action of the diagonal draw bar to form a folding body with a smaller diameter, and the folding body is contained in the plugging connector. The lower end of the adapter is connected with the sandwich valve through a flange, the three-flap folded body is small in size and can be fed into a pipeline through the sandwich valve and the flange hole of the plugging tee joint; after the folding shutoff head got into the pipeline, the leading wheel at first contacted pipeline lower part inner wall, utilize the decurrent effort of hydraulic press to extend forward along the pipeline inner wall toward the air supply direction, the folding shutoff head of three-petal is opened under the effect of pull rod, the shutoff head horizontal adjustment piece of base tip contacts pipeline lower part inner wall, it opens completely simultaneously to control the folding pressure plate, produce elastic pressure between sealing leather cup and the pipeline inner wall, be equivalent to the trip valve, block the medium and flow through the pipeline, implement stifled blind plate operation at the rear end flange this moment, realize the purpose of thorough shutoff.
The specific scheme is as follows:
a blocking method for gas pipeline partition operation comprises a pipeline, a blocking tee joint and a hole opening device, wherein the hole opening device comprises a hole opening machine and a hole opening combiner, and is characterized in that: the method comprises the following steps:
s1: welding a plugging tee joint and a balance short joint on the pipeline;
s11: installing a plugging tee joint and a balance short joint on the pipeline to ensure that the plugging tee joint is horizontal to the pipeline;
s12: welding the plugging tee joint with the pipeline;
s2: perforating on the plugging tee;
s21: a sealing gasket and a valve are arranged on the flange sealing surface of the plugging tee joint;
s22: connecting the tapping machine with the tapping combiner, extending out of a main shaft of the tapping machine, and connecting a cutter and a central drill with the main shaft of the tapping machine;
s23: mounting the tapping device on the valve and fastening with bolts;
s24: disassembling the vent valve plug of the tapping connector and installing a vent ball valve;
s25: connecting a nitrogen source with a pressing joint on the tapping connector, opening a nitrogen source switch, injecting nitrogen into a sealed cavity formed by the tapping connector, the plugging tee joint and the valve, ensuring that the pressure of the sealed cavity is controlled within 1.1 times of the operating pressure of a pipeline, closing the nitrogen source valve, maintaining the pressure for a period of time, judging whether leakage exists or not, and if leakage exists, reinstalling equipment for treatment by fastening bolts, removing the equipment and replacing sealing elements until no leakage exists;
s26: starting the hole drilling machine, recording the hole drilling position when the drill point of the central drill reaches the top of the pipe, and drilling according to the calculated hole drilling stroke until the hole drilling operation is finished;
s3: dismantling the hole drilling equipment;
s31: after the hole opening operation is finished, the cylinder cutter and the cut cutting plate are retracted into the hole opening combiner;
s32: closing the sandwich valve, and opening the exhaust valve of the connector to release pressure;
s33: dismantling the tapping machine, and finishing tapping operation;
s4: plugging operation;
s41: ground inspection of the plugging machine: checking the flexibility of a main shaft and a transmission mechanism of the plugging machine, and selecting a folding plugging head, a plugging header and a leather cup which correspond to the plugging diameter if a lock shaft on the plugging machine is intact;
s42: checking the flange surfaces of the leather cup and the plugging connector to be intact;
s43: installing a folding type plugging head in the plugging header, then extending a main shaft of the plugging machine out, connecting the plugging head with the main shaft of the plugging machine, and withdrawing the plugging head into the plugging header after connection;
s44: after the plugging device is installed, connecting a nitrogen source with a pressing joint on a plugging combiner, then opening a valve at the pressing joint, opening a nitrogen source switch, injecting nitrogen into a sealed cavity in the plugging combiner, ensuring that the pressure of the sealed cavity is controlled within 1.1 times of the operating pressure of a pipeline, closing the nitrogen source valve, maintaining the pressure for a period of time, and confirming no leakage;
s45: connecting the balance short section with the plugging connector by using a balance pipe, opening a valve, balancing pressure, and then performing plugging operation according to the measured size;
s5: blind plate operation;
s51: opening a relief valve of the reconstruction zone;
s52: confirming that no pressure exists at the rear end of the plugging point;
s53: loosening the flange bolts;
s54: inserting a blind plate into the flange;
s55: fastening a flange, ensuring tightness and completely cutting off a medium;
s56: after the rear end maintenance operation is finished, sending the flange bolts again;
s57: extracting the blind plate from the flange;
s58: tightening a flange, and ensuring the tightness;
s6: removing the plugging machine;
s61: after the blind plate operation is finished, installing a balance pipe, and balancing the pressure at two ends of the plugging head to perform lifting plugging operation;
s62: and after the folding plugging head is retracted into the folding plugging connector, closing the sandwich valve and removing the plugging equipment.
S7: plugging operation;
s71: checking that the plugging three-way sealing ring is intact, and connecting the plugging with a main shaft of a tapping machine;
s72: carrying out tightness test on the plugging equipment, opening a valve to carry out plugging operation after the plugging equipment is qualified, and locking and fixing the plug through a snap ring mechanism on the plugging tee joint after the plug reaches the calculated size;
s73: after the plug is installed, observing a pressure gauge on the combiner to confirm that the plug is sealed tightly, retracting a main shaft of the tapping machine into the combiner, opening an exhaust ball valve to release pressure, and then removing the tapping machine, the valve and the plug connector;
s74: and (4) mounting a blind plate matched with the plugging tee joint to the plugging tee joint, and fastening the blind plate by bolts to finish the plugging operation under pressure.
Preferably, the dwell time in S25 is 15 minutes.
Preferably, the dwell time in S44 is 15 minutes.
(III) advantageous effects
The invention provides a plugging method for gas pipeline partition operation. The method has the following beneficial effects:
the plugging method for the gas pipeline partition operation has the advantages of safety and flexibility. The adopted foldable plugging device has small opening diameter which is far lower than the pipe diameter of the gas stopping pipeline, so that the safety of the plugging operation of the large-scale pipeline is improved; meanwhile, the size of the part of the folding type plugging head can be adjusted to flexibly adapt to the change of the diameter of the pipeline. Compared with a single plugging technology, the gas medium cannot be completely cut off due to impurities deposited in the pipeline and the problem of the attachment of the plugging head and the edge of the pipeline. And after the primary separation of high-pressure gas is finished by adopting the blocking and blind plate combined technology, the medium can be thoroughly cut off, and necessary guarantee is provided for the safety of each operation of the rear section. The invention can quickly solve the problem that the large-diameter gas pipeline effectively cuts off gas under the condition of no cut-off valve, provides an effective technical mode no matter the front-end user is ensured not to be influenced in production, or the rear end is ensured to be stopped for emergency rescue or maintenance operation, and has better reference value.
Drawings
FIG. 1 is a front view of a plug head structure of the present invention;
FIG. 2 is a top view of the plug structure of the present invention;
FIG. 3 is a schematic diagram of a blind plate structure;
FIG. 4 is a schematic view of a piping structure;
FIG. 5 is a schematic view illustrating a hole-opening operation state;
FIG. 6 is a schematic view of the plugging operation state;
FIG. 7 is a schematic view of a blind operating condition;
FIG. 8 is a schematic view of a lower block structure;
FIG. 9 is a schematic structural view of a blocking tee and a balance nipple.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Examples
Referring to fig. 1-9, the present invention provides a technical solution: a blocking method for gas pipeline partition operation comprises a pipeline, a blocking tee joint and a tapping device, wherein the tapping device comprises a tapping machine and a tapping combiner, and the method comprises the following steps:
s1: welding a plugging tee joint and a balance short joint on the pipeline;
s11: installing a plugging tee joint and a balance short joint on the pipeline to ensure that the plugging tee joint is horizontal to the pipeline;
s12: welding the plugging tee joint with the pipeline;
s2: perforating on the plugging tee;
s21: a sealing gasket and a valve are arranged on the flange sealing surface of the plugging tee joint;
s22: connecting the tapping machine with the tapping combiner, extending out of a main shaft of the tapping machine, and connecting a cutter and a central drill with the main shaft of the tapping machine;
s23: mounting the tapping device on the valve and fastening with bolts;
s24: disassembling the vent valve plug of the tapping connector and installing a vent ball valve;
s25: connecting a nitrogen source with a pressing joint on the tapping connector, opening a nitrogen source switch, injecting nitrogen into a sealed cavity formed by the tapping connector, the plugging tee joint and the valve, ensuring that the pressure of the sealed cavity is controlled within 1.1 times of the operating pressure of a pipeline, closing the nitrogen source valve, maintaining the pressure for 15 minutes, judging whether leakage exists or not, and if leakage exists, reinstalling equipment for treatment by fastening bolts, dismantling equipment and replacing sealing elements until no leakage exists;
s26: starting the hole drilling machine, recording the hole drilling position when the drill point of the central drill reaches the top of the pipe, and drilling according to the calculated hole drilling stroke until the hole drilling operation is finished;
s3: dismantling the hole drilling equipment;
s31: after the hole opening operation is finished, the cylinder cutter and the cut cutting plate are retracted into the hole opening combiner;
s32: closing the sandwich valve, and opening the exhaust valve of the connector to release pressure;
s33: dismantling the tapping machine, and finishing tapping operation;
s4: plugging operation;
s41: ground inspection of the plugging machine: checking the flexibility of a main shaft and a transmission mechanism of the plugging machine, and selecting a folding plugging head, a plugging header and a leather cup which correspond to the plugging diameter if a lock shaft on the plugging machine is intact;
s42: checking the flange surfaces of the leather cup and the plugging connector to be intact;
s43: installing a folding type plugging head in the plugging header, then extending a main shaft of the plugging machine out, connecting the plugging head with the main shaft of the plugging machine, and withdrawing the plugging head into the plugging header after connection;
s44: after the plugging device is installed, connecting a nitrogen source with a pressing joint on a plugging combiner, then opening a valve at the pressing joint, opening a nitrogen source switch, injecting nitrogen into a sealed cavity inside the plugging combiner, ensuring that the pressure of the sealed cavity is controlled within 1.1 times of the operating pressure of a pipeline, closing the nitrogen source valve, maintaining the pressure for 15 minutes, and confirming no leakage;
s45: connecting the balance short section with the plugging connector by using a balance pipe, opening a valve, balancing pressure, and then performing plugging operation according to the measured size;
s5: blind plate operation;
s51: opening a relief valve of the reconstruction zone;
s52: confirming that no pressure exists at the rear end of the plugging point;
s53: loosening the flange bolts;
s54: inserting a blind plate into the flange;
s55: fastening a flange, ensuring tightness and completely cutting off a medium;
s56: after the rear end maintenance operation is finished, sending the flange bolts again;
s57: extracting the blind plate from the flange;
s58: tightening a flange, and ensuring the tightness;
s6: removing the plugging machine;
s61: after the blind plate operation is finished, installing a balance pipe, and balancing the pressure at two ends of the plugging head to perform lifting plugging operation;
s62: and after the folding plugging head is retracted into the folding plugging connector, closing the sandwich valve and removing the plugging equipment.
S7: plugging operation;
s71: checking that the plugging three-way sealing ring is intact, and connecting the plugging with a main shaft of a tapping machine;
s72: carrying out tightness test on the plugging equipment, opening a valve to carry out plugging operation after the plugging equipment is qualified, and locking and fixing the plug through a snap ring mechanism on the plugging tee joint after the plug reaches the calculated size;
s73: after the plug is installed, observing a pressure gauge on the combiner to confirm that the plug is sealed tightly, retracting a main shaft of the tapping machine into the combiner, opening an exhaust ball valve to release pressure, and then removing the tapping machine, the valve and the plug connector;
s74: and (4) mounting a blind plate matched with the plugging tee joint to the plugging tee joint, and fastening the blind plate by bolts to finish the plugging operation under pressure.
In conclusion, the plugging method for the gas pipeline partition operation has both safety and flexibility. The adopted foldable plugging device has small opening diameter which is far lower than the pipe diameter of the gas stopping pipeline, so that the safety of the plugging operation of the large-scale pipeline is improved; meanwhile, the size of the part of the folding type plugging head can be adjusted to flexibly adapt to the change of the diameter of the pipeline. Compared with a single plugging technology, the gas medium cannot be completely cut off due to impurities deposited in the pipeline and the problem of the attachment of the plugging head and the edge of the pipeline. And after the primary separation of high-pressure gas is finished by adopting the blocking and blind plate combined technology, the medium can be thoroughly cut off, and necessary guarantee is provided for the safety of each operation of the rear section. The invention can quickly solve the problem that the large-diameter gas pipeline effectively cuts off gas under the condition of no cut-off valve, provides an effective technical mode no matter the front-end user is ensured not to be influenced in production, or the rear end is ensured to be stopped for emergency rescue or maintenance operation, and has better reference value.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A blocking method for gas pipeline partition operation comprises a pipeline, a blocking tee joint and a hole opening device, wherein the hole opening device comprises a hole opening machine and a hole opening combiner, and is characterized in that: the method comprises the following steps:
s2: perforating on the plugging tee;
s21: a sealing gasket and a valve are arranged on the flange sealing surface of the plugging tee joint;
s22: connecting the tapping machine with the tapping combiner, extending out of a main shaft of the tapping machine, and connecting a cutter and a central drill with the main shaft of the tapping machine;
s23: mounting the tapping device on the valve and fastening with bolts;
s24: disassembling the vent valve plug of the tapping connector and installing a vent ball valve;
s25: connecting a nitrogen source with a pressing joint on the tapping connector, opening a nitrogen source switch, injecting nitrogen into a sealed cavity formed by the tapping connector, the plugging tee joint and the valve, ensuring that the pressure of the sealed cavity is controlled within 1.1 times of the operating pressure of a pipeline, closing the nitrogen source valve, maintaining the pressure for a period of time, judging whether leakage exists or not, and if leakage exists, reinstalling equipment for treatment by fastening bolts, removing the equipment and replacing sealing elements until no leakage exists;
s26: starting the hole drilling machine, recording the hole drilling position when the drill point of the central drill reaches the top of the pipe, and drilling according to the calculated hole drilling stroke until the hole drilling operation is finished;
s3: dismantling the hole drilling equipment;
s4: plugging operation;
s41: ground inspection of the plugging machine: checking the flexibility of a main shaft and a transmission mechanism of the plugging machine, and selecting a folding plugging head, a plugging header and a leather cup which correspond to the plugging diameter if a lock shaft on the plugging machine is intact;
s42: checking the flange surfaces of the leather cup and the plugging connector to be intact;
s43: installing a folding type plugging head in the plugging header, then extending a main shaft of the plugging machine out, connecting the plugging head with the main shaft of the plugging machine, and withdrawing the plugging head into the plugging header after connection;
s44: after the plugging device is installed, connecting a nitrogen source with a pressing joint on a plugging combiner, then opening a valve at the pressing joint, opening a nitrogen source switch, injecting nitrogen into a sealed cavity in the plugging combiner, ensuring that the pressure of the sealed cavity is controlled within 1.1 times of the operating pressure of a pipeline, closing the nitrogen source valve, maintaining the pressure for a period of time, and confirming no leakage;
s45: connecting the balance short section with the plugging connector by using a balance pipe, opening a valve, balancing pressure, and then performing plugging operation according to the measured size;
s5: blind plate operation;
s51: opening a relief valve of the reconstruction zone;
s52: confirming that no pressure exists at the rear end of the plugging point;
s53: loosening the flange bolts;
s54: inserting a blind plate into the flange;
s55: fastening a flange, ensuring tightness and completely cutting off a medium;
s56: after the rear end maintenance operation is finished, sending the flange bolts again;
s57: extracting the blind plate from the flange;
s58: tightening a flange, and ensuring the tightness;
s6: removing the plugging machine;
s7: plugging operation;
s71: checking that the plugging three-way sealing ring is intact, and connecting the plugging with a main shaft of a tapping machine;
s72: carrying out tightness test on the plugging equipment, opening a valve to carry out plugging operation after the plugging equipment is qualified, and locking and fixing the plug through a snap ring mechanism on the plugging tee joint after the plug reaches the calculated size;
s73: after the plug is installed, observing a pressure gauge on the combiner to confirm that the plug is sealed tightly, retracting a main shaft of the tapping machine into the combiner, opening an exhaust ball valve to release pressure, and then removing the tapping machine, the valve and the plug connector;
s74: and (4) mounting a blind plate matched with the plugging tee joint to the plugging tee joint, and fastening the blind plate by bolts to finish the plugging operation under pressure.
2. The plugging method for gas pipeline partition operation according to claim 1, wherein: the valve is a sandwich valve.
3. The plugging method for gas pipeline partition operation according to claim 1, wherein: the dwell time in S25 was 15 minutes.
4. The plugging method for gas pipeline partition operation according to claim 1, wherein: the dwell time in S44 was 15 minutes.
5. The plugging method for gas pipeline partition operation according to claim 1, wherein: before S2, the following steps are included:
s1: welding a plugging tee joint and a balance short joint on the pipeline;
s11: installing a plugging tee joint and a balance short joint on the pipeline to ensure that the plugging tee joint is horizontal to the pipeline;
s12: and welding the plugging tee joint with the pipeline.
6. The plugging method for gas pipeline partition operation according to claim 1, wherein: the specific steps of S3 are as follows:
s31: after the hole opening operation is finished, the cylinder cutter and the cut cutting plate are retracted into the hole opening combiner;
s32: closing the sandwich valve, and opening the exhaust valve of the connector to release pressure;
s33: and (5) dismantling the tapping machine, and finishing tapping operation.
7. The plugging method for gas pipeline partition operation according to claim 1, wherein: the specific steps of S6 are as follows:
s61: after the blind plate operation is finished, installing a balance pipe, and balancing the pressure at two ends of the plugging head to perform lifting plugging operation;
s62: and after the folding plugging head is retracted into the folding plugging connector, closing the sandwich valve and removing the plugging equipment.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115750969A (en) * | 2023-01-05 | 2023-03-07 | 中化二建集团有限公司 | Air bag isolation oil and gas pipeline plugging and emergency repair construction method |
| CN117655376A (en) * | 2024-01-31 | 2024-03-08 | 新疆三叶管道技术有限责任公司 | Fastener type non-moving fire hole punching device with pressure |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2630617Y (en) * | 2003-06-18 | 2004-08-04 | 中国石油天然气管道局 | Folding stopper |
| CN102996971A (en) * | 2012-12-07 | 2013-03-27 | 内蒙古包钢钢联股份有限公司 | Method for plugging and extracting holed blind plate of coal gas |
| CN103016893A (en) * | 2011-09-21 | 2013-04-03 | 中国建筑第七工程局有限公司 | Hot tapping plugging construction method of long natural gas delivery pipeline |
| CN105987253A (en) * | 2015-01-29 | 2016-10-05 | 胡炎兴 | Oil-gas pipeline blocking system and method |
| CN106151680A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | Gas piping is with pressure takes out stifled blind plate method |
| CN107152578A (en) * | 2017-06-02 | 2017-09-12 | 四川省工业设备安装公司 | Pipeline modification device and with oily hot work method |
| CN109506071A (en) * | 2019-01-11 | 2019-03-22 | 东莞新奥燃气有限公司 | A kind of online plugging method of fuel gas transportation pipeline |
| CN109798412A (en) * | 2018-09-28 | 2019-05-24 | 刘科 | A method of it can comprehensive press and open holes, closure suitable for online pipeline |
| CN110792866A (en) * | 2019-11-13 | 2020-02-14 | 中国石油化工股份有限公司 | Long-distance pipeline under-pressure plugging device and method |
| CN112145860A (en) * | 2020-09-22 | 2020-12-29 | 河北润达石化工程建设有限公司 | Natural gas pipeline overhauling and plugging device and using method |
-
2021
- 2021-11-05 CN CN202111304814.0A patent/CN113932081A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2630617Y (en) * | 2003-06-18 | 2004-08-04 | 中国石油天然气管道局 | Folding stopper |
| CN103016893A (en) * | 2011-09-21 | 2013-04-03 | 中国建筑第七工程局有限公司 | Hot tapping plugging construction method of long natural gas delivery pipeline |
| CN102996971A (en) * | 2012-12-07 | 2013-03-27 | 内蒙古包钢钢联股份有限公司 | Method for plugging and extracting holed blind plate of coal gas |
| CN105987253A (en) * | 2015-01-29 | 2016-10-05 | 胡炎兴 | Oil-gas pipeline blocking system and method |
| CN106151680A (en) * | 2015-04-24 | 2016-11-23 | 五冶集团上海有限公司 | Gas piping is with pressure takes out stifled blind plate method |
| CN107152578A (en) * | 2017-06-02 | 2017-09-12 | 四川省工业设备安装公司 | Pipeline modification device and with oily hot work method |
| CN109798412A (en) * | 2018-09-28 | 2019-05-24 | 刘科 | A method of it can comprehensive press and open holes, closure suitable for online pipeline |
| CN109506071A (en) * | 2019-01-11 | 2019-03-22 | 东莞新奥燃气有限公司 | A kind of online plugging method of fuel gas transportation pipeline |
| CN110792866A (en) * | 2019-11-13 | 2020-02-14 | 中国石油化工股份有限公司 | Long-distance pipeline under-pressure plugging device and method |
| CN112145860A (en) * | 2020-09-22 | 2020-12-29 | 河北润达石化工程建设有限公司 | Natural gas pipeline overhauling and plugging device and using method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115750969A (en) * | 2023-01-05 | 2023-03-07 | 中化二建集团有限公司 | Air bag isolation oil and gas pipeline plugging and emergency repair construction method |
| CN117655376A (en) * | 2024-01-31 | 2024-03-08 | 新疆三叶管道技术有限责任公司 | Fastener type non-moving fire hole punching device with pressure |
| CN117655376B (en) * | 2024-01-31 | 2024-06-07 | 新疆三叶管道技术有限责任公司 | Fastener type non-moving fire hole punching device with pressure |
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Application publication date: 20220114 |