CN113389970A - Variable-diameter low-temperature pipeline flange cladding device and method - Google Patents
Variable-diameter low-temperature pipeline flange cladding device and method Download PDFInfo
- Publication number
- CN113389970A CN113389970A CN202110023984.5A CN202110023984A CN113389970A CN 113389970 A CN113389970 A CN 113389970A CN 202110023984 A CN202110023984 A CN 202110023984A CN 113389970 A CN113389970 A CN 113389970A
- Authority
- CN
- China
- Prior art keywords
- variable
- diameter
- flange
- gasket
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005253 cladding Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 29
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 210000004907 gland Anatomy 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 36
- 229910052757 nitrogen Inorganic materials 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000012856 packing Methods 0.000 description 8
- 239000003949 liquefied natural gas Substances 0.000 description 7
- 210000001503 joint Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
- F16L55/172—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose the ring, band or sleeve being tightened by a tangentially arranged threaded pin and a nut
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a variable-diameter low-temperature pipeline flange coating device and method, which comprises a circular cylinder body formed by splicing an upper coating cover and a lower coating cover; the variable-diameter front flange comprises a variable-diameter front flange upper part, a variable-diameter front flange lower part, a variable-diameter rear flange upper part and a variable-diameter rear flange lower part; the upper part of the front flange with variable diameter is connected with the front end of the upper covering cover; the lower part of the front flange with variable diameter is connected with the front end of the lower covering cover; the upper part of the rear flange with variable diameter is connected with the rear end of the upper cladding cover; the lower part of the rear flange with variable diameter is connected with the rear end of the lower cladding cover; the upper part of the variable-diameter front flange, the lower part of the variable-diameter front flange, the upper part of the variable-diameter rear flange and the lower part of the variable-diameter rear flange are respectively provided with stuffing boxes with different pipe diameters, stuffing is filled in the stuffing boxes, the outside of the stuffing boxes is provided with stuffing glands, and each stuffing box is connected with a pipeline to realize sealing with the pipeline. The invention can realize the online leakage stoppage of the leakage of pipelines with different pipe diameters by the reducing flange.
Description
Technical Field
The invention relates to the technical field of pipeline leakage and blockage, in particular to a variable-diameter low-temperature pipeline flange coating device and method.
Background
The liquefied natural gas is used as a low-temperature clean energy and is widely applied to the aspects of power generation, industrial production, resident life and the like. Under normal pressure, the temperature of liquefied natural gas is-162 ℃, because the use of domestic liquefied natural gas is late, because of the stress effect of pipelines in a low-temperature environment, the pipelines and/or flanges are easy to leak, especially in the process of precooling and production, because of uneven heating, the flanges and/or pipeline welding seams are easy to leak, the existing treatment measures are generally to stop production, replace liquefied natural gas in pipelines, and replace flange gaskets or pipelines, and the leakage treatment method undoubtedly causes certain economic loss, is long in use time and increases safety risks. In addition, the existing online leakage stopping device can only be applied to pipelines with one pipe diameter.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a variable-diameter low-temperature pipeline flange cladding device and method, which can realize online leakage stoppage of pipelines with different pipe diameters through a variable-diameter flange.
The invention adopts the following technical scheme:
on one hand, the variable-diameter low-temperature pipeline flange coating device comprises a circular cylinder body formed by splicing an upper coating cover and a lower coating cover, wherein the circular cylinder body surrounds a leakage pipeline or a leakage flange on the connection end surface of the two pipelines, and the upper coating cover and the lower coating cover are fixedly connected through a connecting piece; further comprising: the variable-diameter front flange upper part, the variable-diameter front flange lower part, the variable-diameter rear flange upper part and the variable-diameter rear flange lower part are arranged on the front flange; the upper part of the front flange with the variable diameter is fixedly connected with the front end of the upper covering cover through a connecting piece; the lower part of the front flange with the variable diameter is fixedly connected with the front end of the lower covering cover through a connecting piece; the upper part of the rear flange with the variable diameter is fixedly connected with the rear end of the upper cladding cover through a connecting piece; the lower part of the rear flange with the variable diameter is fixedly connected with the rear end of the lower covering cover through a connecting piece; the variable-diameter front flange upper portion, the variable-diameter front flange lower portion, the variable-diameter rear flange upper portion and the variable-diameter rear flange lower portion are respectively provided with stuffing boxes with different apertures, stuffing is filled in the stuffing boxes, stuffing covers are arranged outside the stuffing boxes, and each stuffing box is fixedly connected with a pipeline through a connecting piece so as to achieve sealing with the pipeline.
Preferably, the variable-diameter low-temperature pipeline flange cladding device further comprises a first cylinder gasket and a second cylinder gasket; the first cylinder gasket and the second cylinder gasket are arranged between the connecting surfaces of the upper covering cover and the lower covering cover.
Preferably, the first cylinder gasket and the second cylinder gasket comprise polytetrafluoroethylene gaskets, copper gaskets or metal winding gaskets.
Preferably, the variable-diameter low-temperature pipeline flange cladding device further comprises a variable-diameter front flange upper gasket, a variable-diameter front flange lower gasket, a variable-diameter rear flange upper gasket and a variable-diameter rear flange lower gasket; the upper gasket of the front flange with the variable diameter is arranged between the upper part of the front flange with the variable diameter and the front end of the upper cladding cover; the gasket at the lower part of the front flange with the variable diameter is arranged between the lower part of the front flange with the variable diameter and the front end of the lower covering cover; the upper gasket of the rear flange with the variable diameter is arranged between the upper part of the rear flange with the variable diameter and the rear end of the upper cladding cover; the diameter-variable rear flange lower gasket is arranged between the diameter-variable rear flange lower part and the rear end of the lower covering cover.
Preferably, the front end of the upper covering cover is provided with a flange surface connected with the upper part of the front flange with the variable diameter; the front end of the lower covering cover is provided with a flange surface connected with the lower part of the front flange with the variable diameter; the rear end of the upper covering cover is provided with a flange surface connected with the upper part of the rear flange with the variable diameter; and the rear end of the lower covering cover is provided with a flange surface connected with the lower part of the rear flange with the variable diameter.
Preferably, the variable-diameter front flange upper gasket, the variable-diameter front flange lower gasket, the variable-diameter rear flange upper gasket and the variable-diameter rear flange lower gasket comprise polytetrafluoroethylene gaskets, copper gaskets or metal winding gaskets.
Preferably, the connector comprises a bolt.
Preferably, a drainage line is arranged at the bottom end of the lower covering shield, and the outer side of the drainage line is connected with a first valve.
Preferably, the upper part of the upper covering cover is symmetrically provided with an emptying pipeline and a nitrogen injection pipeline; the outer side of the emptying pipeline is connected with a second valve; and the outer side of the nitrogen injection pipeline is connected with a third valve.
In another aspect, a method for cladding a flange of a variable-diameter cryogenic pipeline comprises the following steps: firstly, removing a heat insulation layer around a leakage pipeline or a flange, realizing deicing operation by using high-temperature and high-pressure steam, after the deicing is finished, installing an upper coating cover and a lower coating cover at the leakage pipeline or the flange, then opening a third valve at the upper part of the upper coating cover to enable a nitrogen injection pipeline to be connected with nitrogen, opening a second valve and a first valve to enable an emptying pipeline and a drainage pipeline to be connected with a BOG pipeline, installing a first cylinder gasket and a second cylinder gasket between the upper coating cover and the lower coating cover, and fastening by using bolts; the upper part of a front flange with variable diameter, the lower part of the front flange with variable diameter, the upper part of a rear flange with variable diameter and the lower part of the rear flange with variable diameter are arranged at corresponding positions at two ends of the upper cladding cover and the lower cladding cover, and a gasket at the upper part of the front flange with variable diameter, a gasket at the lower part of the front flange with variable diameter, a gasket at the upper part of the rear flange with variable diameter and a gasket at the lower part of the rear flange with variable diameter are arranged between the upper cladding cover and the lower cladding cover and are fastened by bolts; putting the filler into a stuffing box, installing a filler gland and then fastening by using bolts; and closing the third valve at the nitrogen injection pipeline, and closing the second valve at the discharge pipeline and the first valve at the drainage pipeline after no leakage is observed, so as to recover the heat-insulating material.
Compared with the prior art, the invention has the following beneficial effects:
(1) the two ends of the upper cladding cover and the lower cladding cover are respectively connected with a variable-diameter flange (the upper part of a variable-diameter front flange, the lower part of the variable-diameter front flange, the upper part of a variable-diameter rear flange and the lower part of the variable-diameter rear flange), and a packing box filled with packing is arranged on the variable-diameter flange to realize sealing with a pipeline and further realize online leakage stoppage of pipeline leakage; furthermore, the diameter-variable front flange upper part, the diameter-variable front flange lower part, the diameter-variable rear flange upper part and the diameter-variable rear flange lower part are provided with filling holes with different pipe diameters so as to coat pipelines with different pipe diameters, thereby realizing online leakage stoppage of the leakage of the pipelines with different pipe diameters, saving the raw material cost caused by gas cut-off replacement, recovering the process flow in time, greatly improving the inspection and maintenance efficiency and ensuring the safe operation of the site
(2) The liquefied natural gas drainage device is provided with a drainage pipeline, so that liquefied natural gas drainage can be performed in the installation process, and the site safety is ensured; in addition, the invention is also provided with an emptying pipeline and a nitrogen injection pipeline, has the functions of cylinder replacement and gas emptying and ensures the safety of the operation process; furthermore, the invention can also be provided with a pressure and temperature detection device for monitoring the pressure and temperature data of the cylinder body, thereby further ensuring the operation safety;
(3) the invention has simple installation and operation, and can operate after the heat-insulating layer is removed and no impurities are left on the deicing surface at the position of the leakage point; during operation, sealing of a leakage pipeline or a leakage flange can be realized only by fastening and connecting all the parts through bolts.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the description of the technical means more comprehensible.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an upper half part of a variable-diameter cryogenic pipeline flange cladding device of the invention;
FIG. 2 is a schematic structural diagram of the lower half part of the variable-diameter low-temperature pipeline flange cladding device of the invention;
FIG. 3 is a schematic view of the flange cladding device for a variable-diameter low-temperature pipeline of the invention for emptying and nitrogen injection;
FIG. 4 is a schematic drainage diagram of the flange cladding device for a variable-diameter low-temperature pipeline of the invention;
fig. 5 is a gasket schematic view of the variable-diameter cryogenic pipeline flange cladding device of the invention.
The variable-diameter rear flange comprises an upper covering cover 1, a lower covering cover 2, a leakage flange 3, a leakage flange 4, a variable-diameter front flange upper part, a variable-diameter front flange lower part 5, a variable-diameter rear flange upper part 6, a variable-diameter rear flange lower part 7, a variable-diameter rear flange lower part 8, a packing box 9, packing 10, a packing gland 11, a first cylinder gasket 12, a second cylinder gasket 13, a variable-diameter front flange upper part gasket 14, a variable-diameter front flange lower part gasket 15, a variable-diameter rear flange upper part gasket 16, a variable-diameter rear flange lower part gasket 17, a drainage pipeline 18, a vent pipeline 19 and a nitrogen injection pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 5, in one aspect, the variable-diameter cryogenic pipeline flange cladding device of the present invention includes a circular cylinder body formed by splicing an upper cladding cover 1 and a lower cladding cover 2, the circular cylinder body surrounds a leakage flange 3 (in this embodiment, the leakage flange 3) on a connection end surface of a leakage pipeline or two pipelines, and the upper cladding cover 1 and the lower cladding cover 2 are fixedly connected by a connecting piece; further comprising: the variable-diameter front flange comprises a variable-diameter front flange upper part 4, a variable-diameter front flange lower part 5, a variable-diameter rear flange upper part 6 and a variable-diameter rear flange lower part 7; the upper part 4 of the front flange with the variable diameter is fixedly connected with the front end of the upper cladding cover 1 through a connecting piece; the lower part 5 of the front flange with the variable diameter is fixedly connected with the front end of the lower cladding cover 2 through a connecting piece; the upper part 6 of the rear flange with variable diameter is fixedly connected with the rear end of the upper cladding cover 1 through a connecting piece; the lower part 7 of the rear flange with the variable diameter is fixedly connected with the rear end of the lower cladding cover 2 through a connecting piece; the variable-diameter front flange upper portion 4, the variable-diameter front flange lower portion 5, the variable-diameter rear flange upper portion 6 and the variable-diameter rear flange lower portion 7 are provided with stuffing boxes 8 with different apertures, stuffing 9 is filled in the stuffing boxes 8, a stuffing cover 10 is arranged outside the stuffing boxes 8, and each stuffing box 8 is fixedly connected with a pipeline through a connecting piece to achieve sealing with the pipeline.
Specifically, the upper covering cover 1 and the lower covering cover 2 are two semicircular covering covers, the inner peripheral surfaces of the upper covering cover 1 and the lower covering cover 2 are provided with accommodating grooves which are communicated in the circumferential direction, and the accommodating grooves of the upper covering cover 1 and the lower covering cover 2 are matched to enclose a circular cavity for enclosing the leakage flange 3. The butt joint folded edges extending towards the outer side are respectively arranged on the butt joint end faces of the upper cladding cover 1 and the lower cladding cover 2, and the butt joint folded edges of the upper cladding cover 1 and the lower cladding cover 2 are locked and fixed together through bolts.
In this embodiment, the variable-diameter low-temperature pipeline flange cladding device further includes a first cylinder gasket 11 and a second cylinder gasket 12; the first cylinder gasket 11 and the second cylinder gasket 12 are disposed between the joint faces (butt joint edges) of the upper and lower shrouds 1 and 2.
The first cylinder gasket 11 and the second cylinder gasket 12 comprise polytetrafluoroethylene gaskets, copper gaskets or metal winding gaskets. Of course, other gaskets of sealing material may be used as long as the sealing between the upper and lower casings 1 and 2 is achieved.
The variable-diameter low-temperature pipeline flange cladding device further comprises a variable-diameter front flange upper gasket 13, a variable-diameter front flange lower gasket 14, a variable-diameter rear flange upper gasket 15 and a variable-diameter rear flange lower gasket 16; the diameter-variable front flange upper gasket 13 is arranged between the diameter-variable front flange upper part 4 and the front end of the upper cladding cover 1; the diameter-variable front flange lower gasket 14 is arranged between the diameter-variable front flange lower part 5 and the front end of the lower covering hood 2; the diameter-variable rear flange upper gasket 15 is arranged between the diameter-variable rear flange upper part 6 and the rear end of the upper covering hood 1; the diameter-variable rear flange lower gasket 16 is arranged between the diameter-variable rear flange lower part 7 and the rear end of the lower cladding cover 2.
Further, the front end of the upper covering cover 1 is provided with a flange surface connected with the upper part 4 of the front flange with variable diameter; the front end of the lower covering cover 2 is provided with a flange surface connected with the lower part 5 of the front flange with variable diameter; the rear end of the upper covering cover 1 is provided with a flange surface connected with the upper part 6 of the rear flange with variable diameter; and the rear end of the lower covering cover 2 is provided with a flange surface connected with the lower part 7 of the rear flange with variable diameter.
In this embodiment, the variable-diameter front flange upper gasket 13, the variable-diameter front flange lower gasket 14, the variable-diameter rear flange upper gasket 15, and the variable-diameter rear flange lower gasket 16 include a teflon gasket, a copper gasket, or a metal wound gasket. Of course, other gaskets of sealing material may be used as long as the sealing between the variable-diameter flange (including the variable-diameter front flange upper portion 4, the variable-diameter front flange lower portion 5, the variable-diameter rear flange upper portion 6, and the variable-diameter rear flange lower portion 7) and the upper/lower shroud 2 is achieved.
In this embodiment, the connector includes a bolt.
Specifically, lug plates are respectively arranged on the upper cladding cover 1, the lower cladding cover 2, the front flange upper part 4 with the variable diameter, the front flange lower part 5 with the variable diameter, the rear flange upper part 6 with the variable diameter, the rear flange lower part 7 with the variable diameter and the stuffing box 8, bolt holes are arranged on the lug plates, and bolts penetrate through the bolt holes to realize the fastening connection of the upper cladding cover 1 and the lower cladding cover 2; the bolts penetrate through the upper part 4 of the variable-diameter front flange, the lower part 5 of the variable-diameter front flange, the upper part 6 of the variable-diameter rear flange, the lower part 7 of the variable-diameter rear flange and the upper/lower cladding covers 2 to realize the fastening connection between the variable-diameter flanges (comprising the upper part 4 of the variable-diameter front flange, the lower part 5 of the variable-diameter front flange, the upper part 6 of the variable-diameter rear flange and the lower part 7 of the variable-diameter rear flange) and the upper/lower cladding covers 2.
Further, a drainage pipeline 17 is arranged at the bottom end of the lower covering hood 2, and a first valve is connected to the outer side of the drainage pipeline 17 and used for liquefied natural gas drainage.
The upper part of the upper covering cover 1 is symmetrically provided with a vent pipeline 18 and a nitrogen injection pipeline 19; the outside of the emptying pipeline 18 is connected with a second valve; the outside of the nitrogen injection pipeline 19 is connected with a third valve.
In another aspect, a method for cladding a flange of a variable-diameter cryogenic pipeline comprises the following steps: firstly, removing a heat preservation layer around a leakage pipeline or a flange, realizing deicing operation by using high-temperature high-pressure steam, after deicing is finished, installing an upper coating cover 1 and a lower coating cover 2 at the leakage pipeline or the flange, then opening a third valve at the upper part of the upper coating cover 1 to enable a nitrogen injection pipeline 19 to be connected with nitrogen, opening a second valve and a first valve to enable a vent pipeline 18 and a drainage pipeline 17 to be connected with a BOG pipeline, installing a first cylinder gasket 11 and a second cylinder gasket 12 between the upper coating cover 1 and the lower coating cover 2, and fastening by using bolts; the upper part 4 of the front flange with the variable diameter, the lower part 5 of the front flange with the variable diameter, the upper part 6 of the rear flange with the variable diameter and the lower part 7 of the rear flange with the variable diameter are arranged at corresponding positions at two ends of the upper cladding cover 1 and the lower cladding cover 2, and a gasket 13 at the upper part of the front flange with the variable diameter, a gasket 14 at the lower part of the front flange with the variable diameter, a gasket 15 at the upper part of the rear flange with the variable diameter and a gasket 16 at the lower part of the rear flange with the variable diameter; placing the packing 9 into a packing box 8, installing a packing gland 10 and then fastening by using bolts; the third valve at the nitrogen injection line 19 is closed, and after no leakage is observed, the second valve at the vent line 18 and the first valve at the drain line 17 are closed to recover the insulation material.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. A variable-diameter low-temperature pipeline flange coating device comprises a circular cylinder body formed by splicing an upper coating cover and a lower coating cover, wherein the circular cylinder body surrounds a leakage pipeline or a leakage flange at the connection end surface of the two pipelines, and the upper coating cover and the lower coating cover are fixedly connected through a connecting piece; it is characterized by also comprising: the variable-diameter front flange upper part, the variable-diameter front flange lower part, the variable-diameter rear flange upper part and the variable-diameter rear flange lower part are arranged on the front flange; the upper part of the front flange with the variable diameter is fixedly connected with the front end of the upper covering cover through a connecting piece; the lower part of the front flange with the variable diameter is fixedly connected with the front end of the lower covering cover through a connecting piece; the upper part of the rear flange with the variable diameter is fixedly connected with the rear end of the upper cladding cover through a connecting piece; the lower part of the rear flange with the variable diameter is fixedly connected with the rear end of the lower covering cover through a connecting piece; the variable-diameter front flange upper portion, the variable-diameter front flange lower portion, the variable-diameter rear flange upper portion and the variable-diameter rear flange lower portion are respectively provided with stuffing boxes with different apertures, stuffing is filled in the stuffing boxes, stuffing covers are arranged outside the stuffing boxes, and each stuffing box is fixedly connected with a pipeline through a connecting piece so as to achieve sealing with the pipeline.
2. The variable-diameter cryogenic pipeline flange cladding device of claim 1, further comprising a first barrel gasket and a second barrel gasket; the first cylinder gasket and the second cylinder gasket are arranged between the connecting surfaces of the upper covering cover and the lower covering cover.
3. The variable diameter cryogenic pipeline flange cladding apparatus of claim 2, wherein the first barrel gasket and the second barrel gasket comprise polytetrafluoroethylene gaskets, copper gaskets, or metal wound gaskets.
4. The variable-diameter cryogenic pipeline flange cladding device of claim 1, further comprising a variable-diameter front flange upper gasket, a variable-diameter front flange lower gasket, a variable-diameter rear flange upper gasket, and a variable-diameter rear flange lower gasket; the upper gasket of the front flange with the variable diameter is arranged between the upper part of the front flange with the variable diameter and the front end of the upper cladding cover; the gasket at the lower part of the front flange with the variable diameter is arranged between the lower part of the front flange with the variable diameter and the front end of the lower covering cover; the upper gasket of the rear flange with the variable diameter is arranged between the upper part of the rear flange with the variable diameter and the rear end of the upper cladding cover; the diameter-variable rear flange lower gasket is arranged between the diameter-variable rear flange lower part and the rear end of the lower covering cover.
5. The variable-diameter cryogenic pipeline flange cladding device of claim 4, wherein a flange surface connected with the upper part of the variable-diameter front flange is arranged at the front end of the upper cladding cover; the front end of the lower covering cover is provided with a flange surface connected with the lower part of the front flange with the variable diameter; the rear end of the upper covering cover is provided with a flange surface connected with the upper part of the rear flange with the variable diameter; and the rear end of the lower covering cover is provided with a flange surface connected with the lower part of the rear flange with the variable diameter.
6. The variable-diameter cryogenic pipeline flange cladding device of claim 4, wherein the variable-diameter front flange upper gasket, the variable-diameter front flange lower gasket, the variable-diameter rear flange upper gasket, and the variable-diameter rear flange lower gasket comprise polytetrafluoroethylene gaskets, copper gaskets, or metal wound gaskets.
7. The variable diameter cryogenic pipeline flange cladding apparatus of claim 1, wherein the connectors comprise bolts.
8. The variable-diameter cryogenic pipe flange cladding device of claim 1, wherein a drainage line is arranged at the bottom end of the lower cladding shield, and a first valve is connected to the outer side of the drainage line.
9. The variable-diameter cryogenic pipeline flange cladding device of claim 1, wherein an emptying pipeline and a nitrogen injection pipeline are symmetrically arranged at the upper part of the upper cladding cover; the outer side of the emptying pipeline is connected with a second valve; and the outer side of the nitrogen injection pipeline is connected with a third valve.
10. A method for cladding a flange of a variable-diameter cryogenic pipeline is characterized by comprising the following steps: firstly, removing a heat insulation layer around a leakage pipeline or a flange, realizing deicing operation by using high-temperature and high-pressure steam, after the deicing is finished, installing an upper coating cover and a lower coating cover at the leakage pipeline or the flange, then opening a third valve at the upper part of the upper coating cover to enable a nitrogen injection pipeline to be connected with nitrogen, opening a second valve and a first valve to enable an emptying pipeline and a drainage pipeline to be connected with a BOG pipeline, installing a first cylinder gasket and a second cylinder gasket between the upper coating cover and the lower coating cover, and fastening by using bolts; the upper part of a front flange with variable diameter, the lower part of the front flange with variable diameter, the upper part of a rear flange with variable diameter and the lower part of the rear flange with variable diameter are arranged at corresponding positions at two ends of the upper cladding cover and the lower cladding cover, and a gasket at the upper part of the front flange with variable diameter, a gasket at the lower part of the front flange with variable diameter, a gasket at the upper part of the rear flange with variable diameter and a gasket at the lower part of the rear flange with variable diameter are arranged between the upper cladding cover and the lower cladding cover; putting the filler into a stuffing box, installing a filler gland and then fastening by using bolts; and closing the third valve at the nitrogen injection pipeline, and closing the second valve at the discharge pipeline and the first valve at the drainage pipeline after no leakage is observed, so as to recover the heat-insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110023984.5A CN113389970A (en) | 2021-01-08 | 2021-01-08 | Variable-diameter low-temperature pipeline flange cladding device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110023984.5A CN113389970A (en) | 2021-01-08 | 2021-01-08 | Variable-diameter low-temperature pipeline flange cladding device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113389970A true CN113389970A (en) | 2021-09-14 |
Family
ID=77616673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110023984.5A Pending CN113389970A (en) | 2021-01-08 | 2021-01-08 | Variable-diameter low-temperature pipeline flange cladding device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113389970A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115962368A (en) * | 2021-10-13 | 2023-04-14 | 国家石油天然气管网集团有限公司 | Flange leakage plugging device based on LNG pipeline and use method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4927181A (en) * | 1989-06-22 | 1990-05-22 | Ciotola Alfredo A | Apparatus and method for sealing leaks |
| CN206369047U (en) * | 2016-12-03 | 2017-08-01 | 许川 | A kind of material filling type Pipe leakage stopper |
| CN107747661A (en) * | 2017-10-27 | 2018-03-02 | 中国水利水电第十工程局有限公司 | Spigot-and-socket joint for running water pipe seepage is not cut off the water fast plugging device |
| CN110864184A (en) * | 2019-08-20 | 2020-03-06 | 中海油(福建)应急维修有限责任公司 | Low-temperature pipeline flange cladding device and method |
| CN215111303U (en) * | 2021-01-08 | 2021-12-10 | 国家管网集团(福建)应急维修有限责任公司 | Variable-diameter low-temperature pipeline flange cladding device |
-
2021
- 2021-01-08 CN CN202110023984.5A patent/CN113389970A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4927181A (en) * | 1989-06-22 | 1990-05-22 | Ciotola Alfredo A | Apparatus and method for sealing leaks |
| CN206369047U (en) * | 2016-12-03 | 2017-08-01 | 许川 | A kind of material filling type Pipe leakage stopper |
| CN107747661A (en) * | 2017-10-27 | 2018-03-02 | 中国水利水电第十工程局有限公司 | Spigot-and-socket joint for running water pipe seepage is not cut off the water fast plugging device |
| CN110864184A (en) * | 2019-08-20 | 2020-03-06 | 中海油(福建)应急维修有限责任公司 | Low-temperature pipeline flange cladding device and method |
| CN215111303U (en) * | 2021-01-08 | 2021-12-10 | 国家管网集团(福建)应急维修有限责任公司 | Variable-diameter low-temperature pipeline flange cladding device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115962368A (en) * | 2021-10-13 | 2023-04-14 | 国家石油天然气管网集团有限公司 | Flange leakage plugging device based on LNG pipeline and use method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110864184A (en) | Low-temperature pipeline flange cladding device and method | |
| CN104405973B (en) | Flange steel-plastic multiple tube regulates short tube | |
| CN215111303U (en) | Variable-diameter low-temperature pipeline flange cladding device | |
| CN204284788U (en) | Chain pipe plugging fixture | |
| CN105136406B (en) | Downhole tool high temperature pressure testing device and pressure-measuring method | |
| CN113389970A (en) | Variable-diameter low-temperature pipeline flange cladding device and method | |
| CN103090153A (en) | Compensative pipeline repair device | |
| CN204628955U (en) | A kind of flange leak stoppage device | |
| CN203929520U (en) | A kind of heat exchanger tube pass pressure testing device | |
| CN205896555U (en) | Leaking stoppage reinforcement device under explosion -proof environment of pipeline | |
| CN104019324B (en) | The quick maintenance device of Underwater Two-layer oil transport pipeline | |
| CN216695466U (en) | Pipeline welding seam detects uses water pressure monitoring devices | |
| CN210770621U (en) | Low-temperature liquid valve with leakage-proof function | |
| CN110873255A (en) | Low-temperature pipeline flange cladding device and method | |
| CN204227046U (en) | A kind of cryogenic pump sump | |
| CN208882583U (en) | Sealing element for sealing container opening | |
| CN101586730A (en) | Quick high-pressure no transmission stoppage urgent repair method and jig | |
| CN204381674U (en) | A kind of soldering structure | |
| CN203927233U (en) | The quick maintenance device of Underwater Two-layer oil transport pipeline | |
| CN204226903U (en) | A kind of generator stator cooling water collecting pipe teflon seal structure | |
| CN213498868U (en) | Leakage plugging tool for leakage of wire outlet sleeve of Russian million-generation generator | |
| CN204962151U (en) | Pipeline leaks protector | |
| CN213271125U (en) | Combustion engine flue gas three-way air door | |
| CN209084280U (en) | The online leak stopping structure of gas transmission pipeline | |
| CN205470862U (en) | Industrial boiler collection case hand hole device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 351100 No. 666, Xiangang Avenue, Fengting Town, Xianyou Economic Development Zone, Putian City, Fujian Province Applicant after: National pipe network group (Fujian) emergency maintenance Co.,Ltd. Address before: 351100 No. 666, Xiangang Avenue, Fengting Town, Xianyou Economic Development Zone, Putian City, Fujian Province Applicant before: CNOOC (Fujian) emergency maintenance Co.,Ltd. |
|
| CB02 | Change of applicant information |