CN114382989A - Online cold insulation maintenance method for low-temperature pipeline - Google Patents
Online cold insulation maintenance method for low-temperature pipeline Download PDFInfo
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- CN114382989A CN114382989A CN202210067148.1A CN202210067148A CN114382989A CN 114382989 A CN114382989 A CN 114382989A CN 202210067148 A CN202210067148 A CN 202210067148A CN 114382989 A CN114382989 A CN 114382989A
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- Prior art keywords
- cold insulation
- insulation layer
- pipeline
- maintenance method
- inner cold
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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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/027—Bands, cords, strips or the like for helically winding around a cylindrical object
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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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
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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
- F16L59/00—Thermal insulation in general
- F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention provides an online cold insulation maintenance method for a low-temperature pipeline, relates to the technical field of pipeline cold insulation, and solves the technical problems that a maintenance mode adopted in the prior art is easy to affect objects in the pipeline, the cost is high, and the construction period is long. The method comprises dismantling the old moisture-proof protective structure; removing the old outer cold insulation layer; judging that the inner cold insulation layer is soaked in water or dried, if the inner cold insulation layer is soaked in water, removing the soaked inner cold insulation layer, and if the inner cold insulation layer is dried, keeping the dried inner cold insulation layer; repairing the inner cold insulation layer; installing a new outer cold insulation layer; and installing a new moisture-proof protection structure. The invention is used for maintaining the online cold insulation structure of the low-temperature pipeline, removes the soaked inner cold insulation layer in the maintenance process, and keeps the intact inner cold insulation layer, thereby effectively avoiding the influence on the articles in the pipeline, reducing the working steps and accelerating the maintenance process.
Description
Technical Field
The invention relates to the technical field of pipeline cold insulation, in particular to an online cold insulation maintenance method for a low-temperature pipeline.
Background
The cold insulation structure of the pipeline system of the wharf can be damaged due to aging or other conditions after being used for a long time, and further the phenomena of water dripping, cold air leakage, moss growing and grass growing of the pipeline are caused, so that the pipeline which possibly has problems needs to be repaired.
Disclosure of Invention
The invention aims to provide an online cold insulation maintenance method for a low-temperature pipeline, which solves the technical problems that the maintenance mode adopted by the prior art is easy to influence the articles in the pipeline, the cost is high and the construction period is long. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides an online cold insulation maintenance method for a low-temperature pipeline, which comprises the following steps: dismantling the old damp-proof protection structure;
removing the old outer cold insulation layer;
judging that the inner cold insulation layer is soaked in water or dried, if the inner cold insulation layer is soaked in water, removing the soaked inner cold insulation layer, and if the inner cold insulation layer is dried, keeping the dried inner cold insulation layer;
repairing the inner cold insulation layer;
installing a new outer cold insulation layer;
novel moisture-proof protection structure for installation
Preferably, the method of repairing the inner cold insulation layer comprises:
cleaning and defrosting the pipeline with the internal cold insulation layer removed, installing the internal cold insulation layer and pointing;
and carrying out pointing treatment on the reserved inner cold insulation layer.
Preferably, the method of installing a new outer cold insulation layer comprises:
the new outer cold insulation layer and the inner cold insulation layer are installed in a staggered manner;
the circular seams and the longitudinal seams are bonded by adopting an adhesive and tied by using a rope;
after the adhesive is cured for 5-10 minutes, carrying out pointing treatment on the circular seams and the longitudinal seams;
and (5) binding and fixing.
Preferably, the galvanized iron wires are adopted for binding and fixing, and the binding distance is less than or equal to 300 mm.
Preferably, the method of installing the new moisture protection structure comprises:
a moisture-proof structure is arranged outside the new outer cold insulation layer;
and a protection structure is arranged outside the moisture-proof structure.
Preferably, the method of providing the moisture barrier structure comprises:
coating first asphalt mastic on the outside of the new outer cold insulation layer;
winding glass fiber cloth;
brushing a second asphalt mastic;
and after the first asphalt mastic and the second asphalt mastic are dried, brushing two asphalt mastics.
Preferably, the method of providing the protection structure comprises:
wrapping an outer protective aluminum skin outside the moisture-proof structure;
and stainless steel bands are bound outside the outer protective aluminum sheath, and the interval range of the stainless steel bands is 400-500 mm.
Preferably, the blank pressing width of the adjacent glass fiber cloth is greater than or equal to 50mm, and the overlapping length of the glass fiber cloth ranges from 100mm to 200 mm.
Preferably, the new outer cold insulation layer is a polyisocyanurate shell.
Preferably, the material adopted by the pointing treatment is asphalt mastic.
This application adopts above technical scheme, possesses following beneficial effect at least:
when the on-line cold insulation maintenance method for the low-temperature pipeline is applied, the structure of the inner cold insulation layer is judged to be soaked or dried, only the soaking part is removed, the inner cold insulation layer of the drying part is removed, and the inner cold insulation layer is removed when the foam tile block used by the inner cold insulation layer wrapped on the original pipeline is removed in a whole block, so that the phenomenon that the conveying is interrupted due to the influence on the objects in the pipeline caused by the complete removal of the inner cold insulation layer can be avoided, the maintenance steps can be reduced, and the maintenance period can be shortened; the inner cold insulation layer pointing treatment further enhances the cold insulation effect.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an online cold insulation maintenance method for a cryogenic pipeline according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for installing a new external thermal insulation layer according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of installing a new moisture protection structure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Referring to fig. 1, fig. 1 illustrates a method for maintaining a pipeline in a cold state according to an exemplary embodiment, where the method for maintaining a pipeline in a cold state includes the following steps:
step S1: dismantling the old damp-proof protection structure;
step S2: removing the old outer cold insulation layer;
step S3: judging that the inner cold insulation layer is soaked in water or dried, if the inner cold insulation layer is soaked in water, removing the soaked inner cold insulation layer, and if the inner cold insulation layer is dried, keeping the dried inner cold insulation layer;
step S4: repairing the inner cold insulation layer;
step S5: installing a new outer cold insulation layer;
step S6: and installing a new moisture-proof protection structure.
In the pipeline maintenance process, the maintenance of a low-temperature pipeline in the operation and the maintenance of the low-temperature pipeline in the state of stopping operation can be involved, if the pipeline operation is stopped, all cold insulation structures can be detached in order to improve the working efficiency of the maintenance, and the installation of a new cold insulation structure is carried out after the pipeline is cleaned.
Therefore, in the low-temperature pipeline online cold insulation maintenance method provided by the invention, after the old damp-proof protection structure and the old external cold insulation layer are removed, the state of the internal cold insulation layer is judged to be soaking failure or drying intact, if part of the internal cold insulation layer is soaking failure, the internal cold insulation layer is detached, the whole internal cold insulation layer foam tile block needs to be removed, and then the dried internal cold insulation layer is retained.
Usually the cold insulation structure on the long-term use low temperature pipeline also is that local position goes wrong when going wrong, and the interior cold insulation layer part of other major part positions is still intact part, demolishs partial interior cold insulation structure and can reduce the influence to pipeline inside when maintaining, still reduces work load simultaneously, saves the cost for the maintenance process.
In the method for repairing the internal cold insulation layer in step S4, the classification process specifically includes:
firstly, for an inner cold insulation layer which is dismantled due to water immersion failure, cleaning and defrosting a local pipeline for dismantling the inner cold insulation layer, installing the inner cold insulation layer, and performing pointing treatment; cleaning and wiping by using a cleaning cloth, flushing frost and snow by using water, installing a new inner cold insulation layer, adopting a Polyisocyanurate (PIR) cold insulation pipe shell for the new inner cold insulation layer, bonding a circumferential joint and a longitudinal joint by using a cryogenic adhesive, combining the pipe shells, bundling by using a rope, completely curing for 5 minutes until the pipe shells reach hardness, and pointing the longitudinal joint and the circumferential joint by using asphalt mastic;
and secondly, for the well dried inner cold insulation layer structure, performing pointing treatment on the reserved inner cold insulation layer, and performing pointing by adopting asphalt mastic.
The method for installing the new outer cold insulation layer in the step S5 in the invention comprises the following steps:
step S501: the new outer cold insulation layer and the inner cold insulation layer are installed in a staggered manner;
step S502: the circular seams and the longitudinal seams are bonded by adopting an adhesive and tied by using a rope;
step S503: after the adhesive is cured for 5-10 minutes, carrying out pointing treatment on the circular seams and the longitudinal seams;
step S504: and (5) binding and fixing.
Wherein the new outer cold insulation layer adopted in the step S501 adopts a single-layer polyisocyanurate cold insulation pipe shell with the thickness of 60 mm.
The adhesive used in step S502 may be a cryogenic adhesive.
And S503, standing for at least 5 minutes after the cryogenic adhesive is bonded, wherein the standing time can be 5 to 10 minutes in actual operation, and the pointing can be made of asphalt mastic.
It is worth to say that the new outer cold insulation layer is installed by integrating the wrapped old inner cold insulation layer and the new inner cold insulation layer.
And step S504, binding and fixing are performed by adopting No. 16 galvanized iron wires, the distance between every two adjacent galvanized iron wires is less than or equal to 300 mm, the binding application force is uniform, the tightness is proper, the appearance is regular after the new outer cold insulation layer is bound, the iron wire buckle is slightly hammered into the cold insulation layer, leakage cannot occur, the moisture-proof layer is prevented from being punctured, each binding of the cold insulation layer is independently performed under any condition, and spiral winding binding is strictly prohibited.
In a specific embodiment of the invention, the method for installing the new moisture-proof protection structure comprises the steps of firstly arranging the moisture-proof structure outside the new outer cold insulation layer and then arranging the protection structure outside the moisture-proof structure.
The method for arranging the moisture-proof structure and the method for arranging the protection structure provided by the invention comprise the following steps:
step S601: coating first asphalt mastic on the outside of the new outer cold insulation layer;
step S602: winding glass fiber cloth;
step S603: brushing a second asphalt mastic;
step S604: and after the first asphalt mastic and the second asphalt mastic are dried, brushing the first asphalt mastic and the second asphalt mastic.
Step S605: wrapping an outer protective aluminum skin outside the moisture-proof structure;
step S606: and stainless steel bands are bound outside the outer protective aluminum skin, and the interval range of the stainless steel bands is 400-500 mm.
Steps S601 to S604 are methods of providing a moisture-proof structure, and steps S605 to S606 are methods of providing a protective structure.
Brushing a first layer of asphalt mastic on a new cold insulation layer, immediately winding glass fiber cloth, uniformly and forcefully tightening the glass fiber cloth to ensure that the glass fiber cloth is compact and has no wrinkles when being wound, uniformly pressing the edges, ensuring that the width of the pressed edges is not less than 50mm, ensuring that the lap joint length of a single glass fiber cloth joint ranges from 100mm to 200mm, preferably, the lap joint length provided by the invention is 150mm, brushing a second layer of asphalt mastic on the glass fiber cloth after the glass fiber cloth is wound, ensuring that the permeation rate of the asphalt mastic reaches 100 percent, namely, the blank phenomenon cannot occur, brushing the mastic on the layer twice after the mastic is dried, and ensuring that the thickness is uniform, the surface is consistent, and all joints and layers of the glass fiber cloth of a moisture-proof layer are compact and continuous, the mastic surface has no brush leakage, smooth surface, no bubbles, delamination, cracking and other defects.
The thickness of the aluminum skin used in step S605 may be about 0.5 mm.
And step S606, a packaging machine is adopted to tighten and bundle the stainless steel band, so that the attack resistance to the external severe environment is enhanced, and the cold insulation maintenance of the pipeline is completed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An online cold insulation maintenance method for a low-temperature pipeline is characterized by comprising the following steps:
dismantling the old damp-proof protection structure;
removing the old outer cold insulation layer;
judging that the inner cold insulation layer is soaked in water or dried, if the inner cold insulation layer is soaked in water, removing the soaked inner cold insulation layer, and if the inner cold insulation layer is dried, keeping the dried inner cold insulation layer;
repairing the inner cold insulation layer;
installing a new outer cold insulation layer;
and installing a new moisture-proof protection structure.
2. The on-line cold insulation maintenance method for the cryogenic pipeline according to claim 1, wherein the method for repairing the inner cold insulation layer comprises the following steps:
cleaning and defrosting the pipeline with the internal cold insulation layer removed, installing the internal cold insulation layer and pointing;
and carrying out pointing treatment on the reserved inner cold insulation layer.
3. The on-line cold insulation maintenance method for the cryogenic pipeline according to claim 1, wherein the method for installing the new outer cold insulation layer comprises the following steps:
the new outer cold insulation layer and the inner cold insulation layer are installed in a staggered manner;
the circular seams and the longitudinal seams are bonded by cryogenic adhesive and tied by ropes;
after the adhesive is cured for 5-10 minutes, carrying out pointing treatment on the circular seams and the longitudinal seams;
and (5) binding and fixing.
4. The on-line cold insulation maintenance method for the low-temperature pipeline, according to claim 3, is characterized in that galvanized iron wires are adopted for binding and fixing, and the binding distance is less than or equal to 300 mm.
5. The on-line cold insulation maintenance method for the cryogenic pipeline according to claim 1, wherein the method for installing the new moisture protection structure comprises the following steps:
a moisture-proof structure is arranged outside the new outer cold insulation layer;
and a protection structure is arranged outside the moisture-proof structure.
6. The on-line cold insulation maintenance method for the cryogenic pipeline according to claim 5, wherein the method for arranging the moisture-proof structure comprises the following steps:
coating first asphalt mastic on the outside of the new outer cold insulation layer;
winding glass fiber cloth;
brushing a second asphalt mastic;
and after the first asphalt mastic and the second asphalt mastic are dried, brushing two asphalt mastics.
7. The on-line cold insulation maintenance method for the cryogenic pipeline according to claim 5, wherein the method for arranging the protection structure comprises the following steps:
wrapping an outer protective aluminum skin outside the moisture-proof structure;
and stainless steel bands are bound outside the outer protective aluminum sheath, and the interval range of the stainless steel bands is 400-500 mm.
8. The on-line cold insulation maintenance method for the low-temperature pipeline as claimed in claim 6, wherein the blank pressing width of the adjacent glass fiber cloth is greater than or equal to 50mm, and the overlapping length of the glass fiber cloth ranges from 100mm to 200 mm.
9. The on-line cold insulation maintenance method for the low-temperature pipeline, according to claim 1, is characterized in that the new outer cold insulation layer is a polyisocyanurate pipe shell.
10. The on-line cold insulation maintenance method for the low-temperature pipeline according to claim 2 or 3, wherein the jointing treatment is performed by using asphalt mastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210067148.1A CN114382989A (en) | 2022-01-20 | 2022-01-20 | Online cold insulation maintenance method for low-temperature pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210067148.1A CN114382989A (en) | 2022-01-20 | 2022-01-20 | Online cold insulation maintenance method for low-temperature pipeline |
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| Publication Number | Publication Date |
|---|---|
| CN114382989A true CN114382989A (en) | 2022-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210067148.1A Pending CN114382989A (en) | 2022-01-20 | 2022-01-20 | Online cold insulation maintenance method for low-temperature pipeline |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206802640U (en) * | 2017-04-07 | 2017-12-26 | 酷泰克保温科技江苏有限公司 | A kind of deep cooling pipeline heat-insulating system |
| 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 |
| CN213271610U (en) * | 2020-09-16 | 2021-05-25 | 通辽普莱斯德绝热材料有限公司 | Rock wool insulating tube |
| CN213452115U (en) * | 2020-11-11 | 2021-06-15 | 四川华能泸定水电有限公司 | Protector for water and electricity engineering |
| CN215335204U (en) * | 2021-02-02 | 2021-12-28 | 浙江振申绝热科技股份有限公司 | A novel cold insulation structure for LNG pipeline is under construction on line |
-
2022
- 2022-01-20 CN CN202210067148.1A patent/CN114382989A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206802640U (en) * | 2017-04-07 | 2017-12-26 | 酷泰克保温科技江苏有限公司 | A kind of deep cooling pipeline heat-insulating system |
| 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 |
| CN213271610U (en) * | 2020-09-16 | 2021-05-25 | 通辽普莱斯德绝热材料有限公司 | Rock wool insulating tube |
| CN213452115U (en) * | 2020-11-11 | 2021-06-15 | 四川华能泸定水电有限公司 | Protector for water and electricity engineering |
| CN215335204U (en) * | 2021-02-02 | 2021-12-28 | 浙江振申绝热科技股份有限公司 | A novel cold insulation structure for LNG pipeline is under construction on line |
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