CN114165674B - Ammonia refrigeration pipeline open-flame-free plugging method - Google Patents
Ammonia refrigeration pipeline open-flame-free plugging method Download PDFInfo
- Publication number
- CN114165674B CN114165674B CN202111415722.XA CN202111415722A CN114165674B CN 114165674 B CN114165674 B CN 114165674B CN 202111415722 A CN202111415722 A CN 202111415722A CN 114165674 B CN114165674 B CN 114165674B
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- Prior art keywords
- leakage point
- plugging
- ammonia refrigeration
- leakage
- pipeline
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 37
- 238000005057 refrigeration Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 2
- 239000010962 carbon steel Substances 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000004880 explosion Methods 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
The invention belongs to the technical field of ammonia refrigeration pipeline plugging, and relates to an ammonia refrigeration pipeline open-flame-free plugging method. When a tiny leakage point appears on a pipeline of an ammonia refrigeration system and leakage blocking operation is needed, firstly, drilling and tapping are carried out on the leakage point, and internal threads are formed; screwing the leakage point plugging bolt and the leakage point plugging sealing gasket into the threads of the leakage point after drilling and tapping; the two ends connected with the two semicircular pipe clamps are locked through bolts, spring pads and nuts respectively, so that the leakage point plugging bolts are further compressed, and leakage stoppage of the leakage point is completed. The method ensures that the operation of repairing open fire is not needed when repairing tiny leakage points of the ammonia refrigeration pipeline, and avoids the explosion accident risk caused by the open fire of the residual oil-ammonia mixture due to incomplete emptying of the ammonia refrigeration pipeline; thereby improving the safety of the rush repair and saving the time and the cost of the rush repair of the leakage point of the ammonia refrigeration pipeline.
Description
Technical Field
The invention belongs to the field of maintenance and repair methods of ammonia refrigeration pipelines, and relates to a maintenance and repair pipe clamp for tiny leakage points on pipelines of an ammonia refrigeration system of a refrigeration house in the food cold chain logistics industry or a plugging method for meeting the need of non-welding repair.
Background
The ammonia refrigerant is transported in the ammonia refrigerating system pipeline, which belongs to poisonous, inflammable and explosive working media, and according to the GB50072-2010 refrigerating design specification, the ammonia refrigerating pipeline pipe adopts a GB/T8163 seamless steel pipe, and the high pressure side design pressure of the ammonia refrigerating pressure pipeline is 2.0Mpa, and the low pressure side design pressure is 1.5Mpa. After the refrigerator is operated for a certain period of time, the conditions of sand holes, needle-shaped small holes and the like of the parent metal and the welding line of the individual ammonia refrigerating pipeline are often met. Accidents such as personnel poisoning or fire and explosion are easy to occur after the leakage point of the pipeline is enlarged.
At present, the conventional treatment generally needs to stop production and empty an ammonia refrigeration pipeline of a section to be maintained, and the leakage point can be subjected to welding and plugging on the premise of connecting the atmosphere; however, aiming at old systems with longer pipelines, oil is easy to accumulate in the pipe wall, the emptying time is long, so that the refrigerating system is stopped for a long time, and goods in a refrigeration house are easy to deteriorate; if the oil-ammonia mixture is not completely discharged, explosion accidents are easily caused when the oil-ammonia mixture meets open flame of electric welding.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the open flame-free plugging method for the ammonia refrigeration pipeline, so that electric welding plugging is not needed when the ammonia refrigeration pipeline is in maintenance and repair, the risk of welding plugging accidents is avoided, and the maintenance time and cost are saved.
The technical scheme of the invention is as follows:
An ammonia refrigeration pipeline open-fire-free plugging method comprises the following steps:
step 1, when a tiny leakage point appears on a pipeline of an ammonia refrigeration system, and leakage stopping operation is needed, drilling and tapping are carried out on the leakage point, and internal threads are formed;
Step 2, screwing the leakage point plugging bolt and the leakage point plugging sealing gasket into the threads of the leakage point after the drilling and tapping in the step 1;
And 3, relatively matching and pressing the two semicircular pipe clamps on the upper part of the leakage point plugging bolt, and locking the two ends connected with the two semicircular pipe clamps through the bolt, the spring pad and the nut respectively to further press the leakage point plugging bolt so as to complete the leakage point plugging.
Preferably, step 1 performs a drill tap throughout the pipe wall thickness.
Preferably, the leakage point plugging bolts in the step 2 penetrate through the pipe wall after being screwed, but do not touch the pipe wall at the other side.
The leakage point plugging bolt and the leakage point plugging sealing gasket are directly arranged at the leakage point of the ammonia refrigeration pipeline of the food cold chain refrigerator, are arranged in threads drilled and tapped at the leakage point of the ammonia refrigeration pipeline, and are used for plugging the leakage point of the ammonia refrigeration pipeline. The whole plugging process is sealed by a plugging bolt and a plugging sealing gasket; because the method of bolts and fixed pipe clamps is adopted for plugging, the method has no influence on safety of a small amount of oil-ammonia mixture remained in the ammonia refrigeration pipeline, thus plugging operation can be carried out without nitrogen purging, replacement and welding, the explosion risk of open flame in welding plugging operation caused by incomplete evacuation of the oil-ammonia mixture in the ammonia refrigeration pipeline can be avoided, the maintenance and repair period can be shortened, and the cost can be saved.
Drawings
Fig. 1 is a schematic diagram of a plugging state of a preferred embodiment of an ammonia refrigeration pipeline non-open flame plugging method according to the present invention.
In the figure: 1, a semicircular arc pipe clamp; 2, a bolt; 3, a nut; 4, a spring pad; 5, plugging the bolts by the leakage points; 6, plugging a sealing gasket by a leakage point; and 7 ammonia refrigeration pipelines.
Detailed Description
Other advantages and features of the invention are illustrated by the following description of embodiments of the invention, given by way of example and not by way of limitation, in connection with the accompanying drawings, in which:
An ammonia refrigeration pipeline open-fire-free plugging method comprises the following steps:
step 1, when a tiny leakage point appears on a pipeline of an ammonia refrigeration system, and leakage stopping operation is needed, firstly, drilling and tapping the whole wall thickness of the pipeline at the leakage point, and forming internal threads;
step2, screwing the leakage point plugging bolt 5 and the leakage point plugging sealing gasket 6 into the threads of the leakage point after the drilling and tapping in the step 1; the leakage point plugging bolt 5 penetrates through the pipe wall after being screwed and does not touch the pipe wall at the other side;
and 3, relatively matched and pressed on the upper part of the leakage point plugging bolt 5 through the two semicircular pipe clamps 1, and locking the two ends connected with the two semicircular pipe clamps 1 through the bolt 2, the spring pad 4 and the nut 3 respectively, so as to further press the leakage point plugging bolt 5 and complete the plugging of the leakage point.
The semicircular pipe clamp is 2mm.
The leakage point plugging screw plug is made of carbon steel or stainless steel.
The leakage point sealing gasket is a tetrafluoro gasket.
Although the invention has been described in terms of the preferred embodiment, it is not intended to limit the scope of the invention to the particular form disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. An ammonia refrigeration pipeline open-fire-free plugging method is characterized by comprising the following steps:
Step 1, when a tiny leakage point appears on a pipeline of an ammonia refrigeration system, and leakage stopping operation is needed, drilling and tapping are carried out at the leakage point through the wall thickness of the whole pipeline, and internal threads are formed;
Step2, screwing the leakage point plugging bolt (5) and the leakage point plugging sealing gasket (6) into the internal thread of the leakage point after the drilling and tapping in the step 1, wherein the leakage point plugging bolt (5) penetrates through the pipe wall but does not touch the pipe wall at the other side after being screwed; the leakage point plugging bolt (5) is made of carbon steel or stainless steel; the leakage point plugging sealing gasket (6) is a tetrafluoro gasket;
And 3, relatively matched and pressed on the upper part of the leakage point plugging bolt (5) through two semicircular pipe clamps (1), and locking two ends connected with the two semicircular pipe clamps (1) through the bolt (2), the spring pad (4) and the nut (3) respectively, so as to further press the leakage point plugging bolt (5) and complete the plugging of the leakage point.
2. The ammonia refrigeration pipeline open-fire-free plugging method according to claim 1, wherein the thickness of the semicircular pipe clamp is 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111415722.XA CN114165674B (en) | 2021-11-25 | Ammonia refrigeration pipeline open-flame-free plugging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111415722.XA CN114165674B (en) | 2021-11-25 | Ammonia refrigeration pipeline open-flame-free plugging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114165674A CN114165674A (en) | 2022-03-11 |
| CN114165674B true CN114165674B (en) | 2024-07-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09210285A (en) * | 1996-02-07 | 1997-08-12 | Osaka Gas Co Ltd | Leak hole closing method |
| CN205424275U (en) * | 2016-03-24 | 2016-08-03 | 绍兴柯桥滨海供水有限公司 | Pipeline leakage point welding device |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09210285A (en) * | 1996-02-07 | 1997-08-12 | Osaka Gas Co Ltd | Leak hole closing method |
| CN205424275U (en) * | 2016-03-24 | 2016-08-03 | 绍兴柯桥滨海供水有限公司 | Pipeline leakage point welding device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240605 Address after: Room 606, No. 39-1, Chuangxin Second Road, Shenyang area, China (Liaoning) pilot Free Trade Zone, Shenyang, Liaoning 110167 Applicant after: Yidu (Shenyang) Cold Chain Logistics Development Co.,Ltd. Country or region after: China Address before: 116000 No. 7-2, gangsan Road, Dalian Bonded Logistics Park, Liaoning Province Applicant before: Dalian Port Yidu cold chain Co.,Ltd. Country or region before: China |
|
| GR01 | Patent grant |