CN111744893A - Deicing and defrosting method for LNG low-temperature pipeline and special purging device - Google Patents
Deicing and defrosting method for LNG low-temperature pipeline and special purging device Download PDFInfo
- Publication number
- CN111744893A CN111744893A CN202010536482.8A CN202010536482A CN111744893A CN 111744893 A CN111744893 A CN 111744893A CN 202010536482 A CN202010536482 A CN 202010536482A CN 111744893 A CN111744893 A CN 111744893A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- brush body
- deicing
- guard plate
- defrosting
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/023—Cleaning the external surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a special blowing device for deicing and defrosting of a low-temperature pipeline, which comprises a pair of upper arc cylinder and lower arc cylinder which are oppositely arranged and are connected through a hinge and/or a bolt; the upper arc cylinder comprises an upper outer guard plate on the outer side, an upper brush body on the inner side and an air cavity formed by the upper outer guard plate, the upper brush body, a side plate and a bottom plate; an upper air inlet pipe is arranged on the upper outer protective plate, and the upper brush body is provided with brush bristles and an air outlet hole; the lower arc cylinder comprises a lower outer guard plate at the outer side, a lower brush body at the inner side and an air cavity formed by the lower outer guard plate, the lower brush body, a side plate and a bottom plate; the lower outer guard plate is provided with a lower air inlet pipe, and the lower brush body is provided with brush bristles and an air outlet hole. When the frost on the surface of the low-temperature pipeline is cleaned, the blowing device is fixed on the surface of the pipeline, the tool is moved along the direction of the pipeline, nitrogen or dry air is used for blowing and cleaning the frost on the surface of the pipeline while the brush hair is used for cleaning the surface of the pipeline, and meanwhile, the nitrogen or dry air atmosphere is formed around the outer surface of the pipeline to drive the air containing water vapor around the outer surface of the pipeline, so that the frost is prevented from being formed on the surface of the pipeline again.
Description
Technical Field
The invention belongs to the technical field of petrochemical equipment, and relates to a special blowing device for deicing and defrosting a low-temperature pipeline, in particular to a deicing, defrosting and blowing device used in the process of replacing cold insulation materials of the low-temperature pipeline under an operating condition, and a method for deicing and defrosting the low-temperature pipeline by adopting the deicing, defrosting and blowing device.
Background
After the pipeline cold insulation structure runs for a certain period, the cold insulation structure of the low-temperature pipeline can be damaged in different degrees, such as aging cracking, shrinkage, sinking and the like, so that the cold insulation effect is poor, and partial pipelines can also have the phenomena of condensation, icing, dripping water and moss growing. The phenomenon increases the cold loss and accelerates the corrosion of the pipeline, so that the cold insulation material needs to be repaired and replaced regularly.
Due to production limitations, cold insulation materials need to be replaced without stopping the vehicle. The operating temperature of a low-temperature pipeline, such as a Liquefied Natural Gas (LNG) pipeline, is usually-160 ℃ to-190 ℃, and when an original cold insulation structure is removed, the surface of the pipeline can be rapidly frosted or even frozen, so that the cold insulation effect after replacement is affected, and even the cold insulation structure cannot be replaced.
On the other hand, due to the damage of the original cold insulation structure, the icing phenomenon may occur on the surface of the pipeline at the damaged position of the cold insulation structure, the changed cold insulation structure is also negatively affected, and even the cold insulation structure cannot be changed.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a purging device for deicing and defrosting a low-temperature pipeline, which can quickly remove frost on the surface of an original pipeline under the operation condition of the pipeline and effectively prevent new frost from being generated on the surface of the pipeline when a cold insulation structure is replaced.
The purpose of the invention is realized by the following technical scheme:
a blowing device special for deicing and defrosting of an LNG low-temperature pipeline comprises a pair of semicircular upper arc cylinder 1 and a pair of semicircular lower arc cylinder 2 which are arranged oppositely, wherein the upper arc cylinder 1 and the lower arc cylinder 2 are connected through a hinge 3 and/or a bolt 4; the length of the upper arc cylinder 1 and the length of the lower arc cylinder 2 are 0.5-1.5 m, the radius is designed according to the size of a purging pipeline, a series of purging devices can be developed according to the outer diameter of the pipeline, and serialization is achieved. The upper arc barrel 1 comprises an upper outer guard plate 11 on the outer side, an upper brush body 8 on the inner side, and an air cavity 13 formed by the upper outer guard plate 11, the upper brush body 8, semi-annular side plates on two sides and a bottom plate; an upper air inlet pipe 6 is arranged on the upper outer guard plate 11 and is communicated with the air cavity; the upper brush body 8 is provided with brush bristles 9 and air outlet holes 10. The lower arc barrel 2 comprises a lower outer guard plate 12 on the outer side, a lower brush body on the inner side, and an air cavity formed by the lower outer guard plate 12, the lower brush body, semi-annular side plates on two sides and a bottom plate; a lower air inlet pipe 7 is arranged on the lower outer guard plate 11 and is communicated with the air cavity; the lower brush body is provided with brush bristles and air outlet holes.
Preferably, a handle ear 5 is respectively arranged at two ends of the upper outer guard plate 11 along the length direction (i.e. the axial direction of the blowing device).
Preferably, the number of the upper intake pipes 6 is two, and the upper intake pipes are arranged at the center of the top of the upper outer guard 11 along the length direction. The upper air inlet pipe 6 has the specification of
(i.e., 25mm outer diameter, 3mm wall thickness) and a length of 50 mm.
Preferably, the lower air inlet pipes 7 are arranged in the 45-degree direction of the lower outer guard plate (that is, the air inlet pipes 7 form an angle of 45 degrees with the vertical direction), the number of the lower air inlet pipes 7 is 2n (n is a positive integer, specifically, n is 1, 2, 3, and 4), and the lower air inlet pipes 7 are symmetric in pairs along the length direction, so as to improve the uniformity of air inlet and the distribution speed in the air cavity; further preferably, the number of the lower intake pipes 7 is four. The specification of the lower air inlet pipe 7 is
The length is 50 mm.
The upper outer guard plate 11, the lower outer guard plate 12, the upper brush body 8 and the lower brush body are all semicircular.
Preferably, the wall thickness of the upper brush body 8 is 8-15 mm, and the wall thickness of the lower brush body is 8-15 mm.
Preferably, the bristles are fixed on the upper brush body 8 and the lower brush body; the bristles are made of nylon and are 3-8 cm in length.
The fixing mode of the brush hair is common knowledge of the technicians in the field, and the brush hair mounting holes can be arranged on the upper brush body 8 and the lower brush body, a bundle of brush hair is arranged in each mounting hole, and the brush hair is fixed in the mounting holes by adopting polyester wires or steel wires and the like. The bristle quantity of each group of bristles is adjusted according to actual conditions.
Preferably, the air outlet hole penetrates through the upper brush body 8 and the lower brush body; the diameter of the air outlet is 1-5 mm.
Preferably, the brush hair on the upper brush body 8, the lower brush body and the ventholes are in net distribution, namely the brush hair is located between two adjacent rows of the ventholes, the distance between the adjacent brush hair and the ventholes is 3-5 mm, and during blowing, nitrogen or dry air further drives the brush hair to frost and ice on the surface of the cleaning pipeline.
The upper air inlet pipe 6 and the lower air inlet pipe 7 are respectively communicated with an air source through hoses. The gas source is nitrogen or dry air, and preferably the nitrogen or the dry air with the gas pressure of 0.4-1 MPa. In order to ensure the pressure of the blowing gas, the widths of the gas cavities of the upper arc cylinder 1 and the lower arc cylinder 2 are respectively 20-50 mm.
When the upper arc barrel 1 and the lower arc barrel 2 are connected through the bolt 4, the upper outer guard plate 11 of the upper arc barrel 1 is outwards bent to form an upper connecting lug plate, the lower outer guard plate 12 of the lower arc barrel 2 is outwards bent to form a lower connecting lug plate, and the upper lug plate and the lower lug plate are connected through the bolt.
Preferably, one side of the upper arc barrel 1 and one side of the lower arc barrel 2 are connected through a hinge 3, the other side of the upper outer guard plate 11 of the upper arc barrel 1 and the other side of the lower outer guard plate 12 of the lower arc barrel 2 are respectively bent outwards to form an upper connecting lug plate and a lower connecting lug plate, and the upper lug plate and the lower lug plate are connected through a bolt 4.
The upper and lower connecting lug plates are provided with threaded holes matched with the bolts 4; or the upper and lower connecting ear plates are provided with smooth holes for the bolts 4 to pass through, and the bolts are provided with nuts.
Another object of the present invention is to provide a method for deicing and defrosting an LNG cryogenic pipeline, comprising: the special blowing device for deicing and defrosting of the LNG low-temperature pipeline is arranged on the surface of the low-temperature pipeline, is communicated with an air source, and is moved along the axis of the pipeline by holding the lug handle, so that the frosting and icing on the surface of the pipeline can be quickly and effectively cleaned under the combined action of the bristles and the blowing gas.
The low temperature of the invention is generally-160 ℃ to-190 ℃.
The invention has the beneficial effects that:
when the device is used for cleaning the frost on the surface of the low-temperature pipeline, the blowing device is arranged on the surface of the low-temperature pipeline, the device is moved along the axis of the pipeline by holding the ear handle, the bristles are used for cleaning the surface of the pipeline in the moving process, meanwhile, nitrogen or dry air can blow the ice on the surface of the pipeline in the whole circumference, the ice can be usually melted after about 1min, at the moment, the bristles are driven by gas, the frost and the ice on the surface of the pipeline can be cleaned, and the frost and the ice on the surface of the pipeline can be quickly and effectively cleaned under the combined action of the bristles and the blowing gas.
On the other hand, the atmosphere filled with nitrogen or dry air is formed around the outer surface of the pipeline to drive the air containing water vapor around, so that the phenomenon that the icing is formed on the surface of the pipeline again can be effectively avoided.
Drawings
Fig. 1 is a schematic structural diagram of a purging device special for deicing and defrosting of an LNG cryogenic pipeline;
FIG. 2 is a side view of a purging device dedicated to deicing and defrosting of an LNG cryogenic pipeline;
FIG. 3 is a plan view of the inner brush body;
FIG. 4 is a plan view of the upper arc barrel;
FIG. 5 is a plan view of the lower arc barrel;
fig. 6 is a three-dimensional schematic view of the special purging device for deicing and defrosting of the low-LNG temperature pipeline.
In the figure: the novel toothbrush comprises, by weight, 1-an upper arc cylinder, 2-a lower arc cylinder, 3-a hinge, 4-a bolt, 5-a handheld lug, 6-an upper air inlet pipe, 7-a lower air inlet pipe, 8-an upper brush body, 9-bristles, 10-an air outlet hole, 11-an upper outer guard plate and 12-a lower outer guard plate.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
As shown in fig. 1-6, the purging device for deicing and defrosting of the LNG cryogenic pipeline comprises a pair of semicircular upper arc cylinders 1 and semicircular lower arc cylinders 2 which are symmetrically arranged. The radiuses of the upper arc cylinder 1 and the lower arc cylinder 2 are adjusted according to the size of the purging pipeline, and the length of the purging pipeline is 0.5 m.
The upper arc barrel 1 comprises an upper outer guard plate 11 on the outer side, an upper brush body 8 on the inner side, and an air cavity formed by the upper outer guard plate 11, the upper brush body 8, semi-annular side plates on two sides and a bottom plate connecting the upper outer guard plate 11 and the bottom end of the upper brush body 8, and the width of the air cavity is 20 mm; two upper air inlet pipes 6 are arranged in the center of the top of the upper outer guard plate 11, and two handheld ear handles 5 are respectively arranged at two ends of the upper outer guard plate 11 along the length direction; the upper brush body 8 is provided with bristles 9 and air outlets 10, the bristles 8 are located between two adjacent rows of the air outlets 10, so that the bristles 8 and the air outlets 10 are distributed on the upper brush body in a net shape, and the distance between each adjacent bristle 8 and each air outlet 10 is 3 mm.
The lower arc barrel 2 comprises a lower outer guard plate 12 on the outer side, a lower brush body on the inner side, and a closed air cavity formed by the lower outer guard plate 12, the lower brush body, semi-annular side plates on two sides and a bottom plate connecting the upper outer guard plate 11 and the top end of the upper brush body 8, and the width of the air cavity is 20 mm; the lower outer guard plate 11 is provided with lower air inlet pipes 7, the lower air inlet pipes 7 are arranged in the 45-degree direction of the lower outer guard plate, the number of the lower air inlet pipes 7 is four, and the four lower air inlet pipes are symmetrical in pairs along the length direction; the lower brush body be equipped with brush hair and venthole, the brush hair be located between two adjacent rows of ventholes and make brush hair and venthole be netted distribution under on the brush body, adjacent brush hair is 3mm with the gas pocket interval.
One side of the upper arc barrel 1 and one side of the lower arc barrel 2 are connected through a hinge 3, the other sides of the upper outer guard plate 11 of the upper arc barrel 1 and the lower outer guard plate 12 of the lower arc barrel 2 are respectively bent outwards to form an upper connecting lug plate and a lower connecting lug plate, and the upper connecting lug plate and the lower connecting lug plate are respectively provided with threaded holes matched with the bolts 4 so that the upper lug plate and the lower lug plate are connected through the bolts 4.
The upper air inlet pipe 6 has the specification of
The height is 50 mm. The specification of the lower air inlet pipe 7 is
The height is 50 mm.
The upper outer guard plate 11, the lower outer guard plate 12, the upper brush body 8 and the lower brush body are all semicircular. The wall thickness of the upper brush body 8 and the wall thickness of the lower brush body are both 8 mm.
The bristles are made of nylon and are 3cm long, and the bristles are fixed on the upper brush body 8 and the lower brush body. The diameter of the air outlet is 1mm and penetrates through the upper brush body 8 and the lower brush body.
The upper air inlet pipe 6 and the lower air inlet pipe 7 are respectively communicated with an air source through hoses. The gas source is nitrogen, and the pressure of the nitrogen is 0.4-1 MPa during work.
When the frost on clearance low temperature pipeline surface, sweep the device with this embodiment and install in low temperature pipeline surface, move along the pipeline axis through handheld ear handle, when utilizing the brush hair to clean pipeline surface, dry nitrogen gas can sweep the freezing of pipeline surface in whole circumference simultaneously, can melt freezing about 1min usually, at this moment, utilize gaseous drive brush hair can clear away the frosting on pipeline surface, freeze, quick effectual clean pipeline surface's frosting, freezing under brush hair and the gaseous combined action of sweeping. Meanwhile, the nitrogen atmosphere formed around the outer surface of the pipeline can drive the air containing water vapor around, and the phenomenon that the icing is formed on the surface of the pipeline again is effectively avoided.
Example 2
On the basis of the embodiment 1, the connection mode of the upper arc barrel 1 and the lower arc barrel 2 is adjusted, two sides of an upper outer guard plate 11 of the upper arc barrel 1 and two sides of a lower outer guard plate 12 of the lower arc barrel 2 are bent outwards to form an upper connection lug plate and a lower connection lug plate, and the upper lug plate and the lower lug plate are connected through the bolts 4.
Claims (10)
1. A blowing device special for deicing and defrosting of an LNG low-temperature pipeline is characterized by comprising a pair of semicircular upper arc cylinder and semicircular lower arc cylinder which are oppositely arranged, wherein the upper arc cylinder and the lower arc cylinder are connected through hinges and/or bolts; the upper arc cylinder comprises an upper outer guard plate on the outer side, an upper brush body on the inner side and an air cavity formed by the upper outer guard plate, the upper brush body, a side plate and a bottom plate; an upper air inlet pipe is arranged on the upper outer guard plate; the upper brush body is provided with brush bristles and air outlet holes; the lower arc cylinder comprises a lower outer guard plate at the outer side, a lower brush body at the inner side and an air cavity formed by the lower outer guard plate, the lower brush body, a side plate and a bottom plate; a lower air inlet pipe is arranged on the lower outer guard plate; the lower brush body is provided with brush bristles and air outlet holes.
2. The purging device special for deicing and defrosting of the LNG cryogenic pipeline as claimed in claim 1, wherein a handheld lug is respectively arranged at two ends of the upper outer guard plate along the length direction.
3. The purging device special for deicing and defrosting of the LNG cryogenic pipeline as claimed in claim 1, wherein the number of the upper inlet pipes is two, and the two upper inlet pipes are arranged in the center of the top of the upper outer protecting plate; the lower air inlet pipe is arranged in the 45-degree direction of the lower outer guard plate, the number of the lower air inlet pipes is 2n, and the lower air inlet pipes are symmetrical pairwise along the length direction.
4. The purging device special for deicing and defrosting of the LNG cryogenic pipeline as claimed in claim 3, wherein the number of the lower air inlet pipes is four.
5. The purging device special for deicing and defrosting of the LNG low-temperature pipeline as claimed in claim 1, wherein the upper arc cylinder and the lower arc cylinder are the same in length and are 0.5-1.5 m; the wall thickness of the upper brush body is 8-15 mm, and the wall thickness of the lower brush body is 8-15 mm.
6. The purging device special for deicing and defrosting of the LNG low-temperature pipeline as claimed in claim 1, wherein the bristles are made of nylon and have a length of 3-8 cm; the diameter of the air outlet is 1-5 mm.
7. The blowing device special for deicing and defrosting of the low-temperature pipeline according to claim 1, wherein the bristles on the upper brush body and the lower brush body are distributed in a net shape with the air outlet holes, and the distance between the adjacent bristles and the air outlet holes is 3-5 mm.
8. The purging device special for deicing and defrosting of the LNG low-temperature pipeline as claimed in claim 1, wherein the upper air inlet pipe and the lower air inlet pipe are respectively communicated with an air source through hoses, and the air source is nitrogen or dry air with the pressure of 0.5-1.5 MPa.
9. The LNG low-temperature pipeline deicing and defrosting special purging device as claimed in claim 1, wherein one side of the upper arc cylinder and one side of the lower arc cylinder are connected through hinges, the other side of the upper outer guard plate of the upper arc cylinder and the other side of the lower outer guard plate of the lower arc cylinder are respectively bent outwards to form an upper connecting lug plate and a lower connecting lug plate, and the upper lug plate and the lower lug plate are connected through bolts.
10. The method for deicing and defrosting LNG low-temperature pipelines is characterized in that the special blowing device for deicing and defrosting LNG low-temperature pipelines as claimed in any one of claims 1 to 9 is installed on the surface of the low-temperature pipelines, an air source is connected, the blowing device is moved along the axis of the pipelines through a handle, and frost and ice on the surface of the pipelines are cleaned under the combined action of bristles and blowing gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010536482.8A CN111744893A (en) | 2020-06-12 | 2020-06-12 | Deicing and defrosting method for LNG low-temperature pipeline and special purging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010536482.8A CN111744893A (en) | 2020-06-12 | 2020-06-12 | Deicing and defrosting method for LNG low-temperature pipeline and special purging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111744893A true CN111744893A (en) | 2020-10-09 |
Family
ID=72676022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010536482.8A Pending CN111744893A (en) | 2020-06-12 | 2020-06-12 | Deicing and defrosting method for LNG low-temperature pipeline and special purging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111744893A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112337903A (en) * | 2020-10-16 | 2021-02-09 | 衡阳华瑞电气有限公司 | Deicing device and deicing method for wall bushing of current transformer |
| CN113731963A (en) * | 2021-09-24 | 2021-12-03 | 王剑 | Petroleum pipeline cleaning device for softening oil stains by using high-temperature steam |
| CN114653689A (en) * | 2022-03-24 | 2022-06-24 | 魏想彬 | Self-adaptive multi-frequency ice-chiseling blowing type low-temperature pipeline defrosting device |
| CN115452175A (en) * | 2022-09-05 | 2022-12-09 | 徐州盛安化工科技有限公司 | Pipeline temperature detection device for natural gas distribution station |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040092875A (en) * | 2003-04-29 | 2004-11-04 | 주식회사 포스코 | Device for cleaning roll in pickling apparatus |
| CN204355004U (en) * | 2014-11-26 | 2015-05-27 | 河北科技大学 | A kind of rain brush of automatic removing windshield frost |
| CN206613754U (en) * | 2017-01-24 | 2017-11-07 | 南京铁道职业技术学院 | A kind of insulator device for expelling ice and snow |
| CN108075428A (en) * | 2017-12-28 | 2018-05-25 | 郑州天舜电子技术有限公司 | A kind of rod-pulling type electric power overhead transmission line cable deicer |
| CN110486574A (en) * | 2019-07-30 | 2019-11-22 | 江苏中圣管道工程技术有限公司 | Cryogenic piping system cold insulation structure repairs replacement method |
-
2020
- 2020-06-12 CN CN202010536482.8A patent/CN111744893A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040092875A (en) * | 2003-04-29 | 2004-11-04 | 주식회사 포스코 | Device for cleaning roll in pickling apparatus |
| CN204355004U (en) * | 2014-11-26 | 2015-05-27 | 河北科技大学 | A kind of rain brush of automatic removing windshield frost |
| CN206613754U (en) * | 2017-01-24 | 2017-11-07 | 南京铁道职业技术学院 | A kind of insulator device for expelling ice and snow |
| CN108075428A (en) * | 2017-12-28 | 2018-05-25 | 郑州天舜电子技术有限公司 | A kind of rod-pulling type electric power overhead transmission line cable deicer |
| CN110486574A (en) * | 2019-07-30 | 2019-11-22 | 江苏中圣管道工程技术有限公司 | Cryogenic piping system cold insulation structure repairs replacement method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112337903A (en) * | 2020-10-16 | 2021-02-09 | 衡阳华瑞电气有限公司 | Deicing device and deicing method for wall bushing of current transformer |
| CN113731963A (en) * | 2021-09-24 | 2021-12-03 | 王剑 | Petroleum pipeline cleaning device for softening oil stains by using high-temperature steam |
| CN114653689A (en) * | 2022-03-24 | 2022-06-24 | 魏想彬 | Self-adaptive multi-frequency ice-chiseling blowing type low-temperature pipeline defrosting device |
| CN115452175A (en) * | 2022-09-05 | 2022-12-09 | 徐州盛安化工科技有限公司 | Pipeline temperature detection device for natural gas distribution station |
| CN115452175B (en) * | 2022-09-05 | 2023-09-01 | 徐州盛安化工科技有限公司 | Pipeline temperature detection device for natural gas sub-station |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111744893A (en) | Deicing and defrosting method for LNG low-temperature pipeline and special purging device | |
| CN213256069U (en) | Special purging device for deicing and defrosting of low-temperature pipeline | |
| CN110486574B (en) | Low-temperature pipeline system cold insulation structure repair and replacement method | |
| CN102470385A (en) | Device for dispensing fluid jets without a rotating joint | |
| US20210291206A1 (en) | Reciprocating spray cleaning system for air-cooled heat exchangers | |
| CN110681653A (en) | Elastic cleaning device for attachments on inner wall of pipeline | |
| US6581235B1 (en) | Apparatus for cleaning and removing deposits from internal walls of ducts for conveying fluids of any kind | |
| CN212536922U (en) | Spray header fixing device for landscaping | |
| CN108386714A (en) | The deicer of liquified natural gas output channel | |
| CN114618844A (en) | Cleaning device for petroleum conveying pipeline | |
| CN209040061U (en) | A kind of municipal administration snow melting salt spary device | |
| US4956042A (en) | Process and apparatus for embrittling and subsequently removing an outer protective coating of a pipe or pipeline | |
| CN111740368B (en) | High-voltage line defroster | |
| CN210891059U (en) | Special purging system for online repair of cold insulation structure of LNG pipeline | |
| CN210860655U (en) | Be applicable to online restoration special purge system of assembled cold insulation structure of many pipe diameters | |
| CN212081273U (en) | Purging device for heat exchanger tube bank of waste heat boiler and waste heat boiler with purging device | |
| CN211990065U (en) | Inside cleaning device for mechanical casting mould | |
| CN203116401U (en) | Mop for cleaning exhausting pipe | |
| CN212057897U (en) | Water removal mechanism for refrigeration equipment | |
| KR101040513B1 (en) | Rotatable nozzle for frost removing apparatus of freezer | |
| CN220479149U (en) | Rust-proof device for bolt production | |
| CN221638981U (en) | LNG low temperature pipeline sweeps device | |
| CN216225183U (en) | Petroleum pipeline inner wall anticorrosive coating drying device of improvement | |
| US2687623A (en) | Ice-making machine | |
| KR20030048123A (en) | Snow making method and apparatus |
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 |