CN114198596B - Thermal insulation construction process suitable for pipeline joint under extremely cold weather - Google Patents
Thermal insulation construction process suitable for pipeline joint under extremely cold weather Download PDFInfo
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- CN114198596B CN114198596B CN202111402862.3A CN202111402862A CN114198596B CN 114198596 B CN114198596 B CN 114198596B CN 202111402862 A CN202111402862 A CN 202111402862A CN 114198596 B CN114198596 B CN 114198596B
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- 238000010276 construction Methods 0.000 title claims abstract description 31
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- 238000009413 insulation Methods 0.000 title claims description 30
- 239000002390 adhesive tape Substances 0.000 claims abstract description 54
- 238000004321 preservation Methods 0.000 claims abstract description 39
- 238000002844 melting Methods 0.000 claims abstract description 35
- 238000003466 welding Methods 0.000 claims abstract description 28
- 230000008018 melting Effects 0.000 claims abstract description 26
- 239000004814 polyurethane Substances 0.000 claims abstract description 24
- 229920002635 polyurethane Polymers 0.000 claims abstract description 23
- 238000005187 foaming Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 239000004743 Polypropylene Substances 0.000 claims abstract description 18
- 238000005260 corrosion Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 18
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- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
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- 238000011049 filling Methods 0.000 claims description 8
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 230000002421 anti-septic effect Effects 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 9
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Classifications
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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
-
- 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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1063—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sheet wrapped around the pipe
-
- 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—Compositions for or methods of fixing a thermally insulating material
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
Abstract
The invention provides a heat preservation construction process suitable for a pipeline joint under extremely cold weather, which comprises the following steps of: s1, carrying out interface heat preservation preparation work on a pipeline; s2, carrying out anti-corrosion treatment on the pipeline interface part; s3, planning and welding the electrothermal welding sleeve; s4, a heat-insulating foaming polyurethane heat-insulating layer; s5, smoothing the welding part through the viscoelastic body paste; s6, sealing and protecting by adopting a viscoelastic body adhesive tape; and S7, winding protection is carried out by adopting a polypropylene adhesive tape. The heat preservation construction process for the pipeline interface under extremely cold weather has the advantages of simple structure, reasonable design, good anti-corrosion effect, and scientific and reasonable setting of anti-corrosion interval time aiming at corresponding humidity of the environment, can be used for reducing operation difficulty through a heat preservation structure and the construction process, thereby avoiding expansion of anti-corrosion and heat-preservation materials, ensuring uniform heating through hot melting of an electric melting sleeve, avoiding edge curling or edge curling of a pipeline, and being easy to popularize.
Description
Technical Field
The invention belongs to the technical field of thermal insulation of pipeline interfaces in extremely cold weather, and particularly relates to a thermal insulation construction process suitable for pipeline interfaces under extremely cold weather.
Background
The construction of pipelines in alpine regions is a relatively complex task, and the technical problem of the construction of pipelines in permafrost regions is urgently solved along with the promotion of the development progress and the speed in western regions. Therefore, the construction treatment of the anti-corrosion heat-preservation pipeline in the alpine region is enhanced, and various works in the construction of the pipeline are particularly important.
1 difficulties and solutions for in-situ repair technique
1.1 technical difficulties
When the anti-corrosion heat-insulation pipeline joint coating technology is processed in the alpine region, the problems of environment, structure, process, construction materials and the like are faced, and the following difficulties exist in the specific operation process.
(1) The temperature in the alpine region is lower throughout the year, the minimum temperature can reach-40 ℃, and the extremely cold weather and stronger wind force bring great difficulty to site joint coating operation;
(2) When the pipeline is subjected to corrosion prevention and heat preservation treatment, the corrosion prevention and heat preservation material can expand in high and cold areas, so that the cohesiveness is not well controlled;
(3) Under the high and cold temperature environment, the pipeline can shrink or expand, so that the phenomena of easy glue opening and the like can occur. The characteristics of the fluid are not obvious under the condition of low air temperature, so that the problems of difficult stirring or slow solidification can occur, and the problems of edge curling or curling can occur if the problems of uneven heating and the like occur.
Disclosure of Invention
In view of the above, the invention aims to provide a heat preservation construction process suitable for pipeline interfaces under extremely cold weather so as to solve the defects in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the heat preservation construction process suitable for the pipeline joint under extremely cold weather comprises the following steps of:
s1, carrying out interface heat preservation preparation work on a pipeline;
the two pipeline joint positions are provided with heat-insulating structures, each heat-insulating structure comprises a high Wen Xingre shrink belt, a polyurethane heat-insulating layer, an electric heating sleeve, a viscoelastic adhesive tape, viscoelastic adhesive tapes and polypropylene adhesive tapes, the inner walls of the high-temperature heat-shrinkable belts are fixedly sleeved on the 2 pipeline joint positions, the outer walls of the high Wen Xingre shrink belts are sequentially fixedly sleeved with the polyurethane heat-insulating layer and the electric heating sleeve, the upper ends and the lower ends of the electric heating sleeve are respectively fixedly connected with one viscoelastic adhesive tape, the two ends of the outer walls of the electric heating sleeve are respectively fixedly sleeved with one viscoelastic adhesive tape, the viscoelastic adhesive tapes are covered on the outer walls of the viscoelastic adhesive tapes, and the outer walls of the viscoelastic adhesive tapes are fixedly sleeved with one polypropylene adhesive tape;
s2, carrying out anti-corrosion treatment on the pipeline interface part;
s3, planning and welding the electrothermal welding sleeve;
s4, a heat-insulating foaming polyurethane heat-insulating layer;
s5, smoothing the welding part through the viscoelastic body paste;
s6, sealing and protecting the joint of the electric heating sleeve and transverse seams at two ends of the electric heating sleeve by adopting a viscoelastic body adhesive tape;
and S7, winding and protecting the sealing part of the viscoelastic body adhesive tape by adopting a polypropylene adhesive tape.
Further, the interface thermal insulation preparation in step S1 includes the following steps:
s11, performing rust removal cleaning on the surface of the pipeline at the joint part;
s12, cleaning the surface of the outer protective tube of the pipeline and the surface of the waterproof end cap.
Further, the antiseptic treatment in step S2 includes the steps of:
s21, carrying out anti-corrosion treatment on the exposed steel pipe part at the joint part by adopting a high Wen Xingre shrink belt;
s22, judging whether the relative humidity of the environment is greater than 80%, if yes, the anticorrosion interval time is less than or equal to 2 hours, otherwise, executing the step S23;
s23, judging whether the relative humidity of the environment is in a range of 70% -80%, if yes, the anticorrosion interval time is less than or equal to 3 hours, otherwise, executing the step S24;
s24, judging whether the relative humidity of the environment is less than or equal to 70%, if so, keeping the corrosion interval time to be less than or equal to 4 hours.
Further, the planning and welding in step S3 includes the steps of:
s31, measuring the length of a heat-insulation interface at the interface part of the pipeline, and planning the position of the electric heating sleeve according to the length of the electric heating sleeve;
s32, checking whether the electrothermal fuse of the electrothermal fuse sleeve is broken or not;
s33, placing the electric heating sleeve according to the planned position, and filling the gaps at the lap joint positions of the transverse seams at the two ends of the electric heating sleeve by using PE rods;
s34, hot melting the electric heating sleeve;
s35, sealing the interface part, and performing an air tightness test on the interface part.
Further, the heat preservation foaming in step S4 includes the steps of:
s41, manufacturing a heat-insulating layer filler;
s42, knocking test is carried out after the heat preservation layer filling material is solidified;
s43, forming a polyurethane heat-insulating layer after the interface heat-insulating foaming is completed, and sealing the opening of the electric-heating sleeve so as to weld the polyurethane heat-insulating layer and the electric-heating sleeve.
Further, in the step S6, the overlapping range of the viscoelastic body adhesive tape to the outer protective tube of the pipeline and the electrothermal welding sleeve is more than or equal to 100mm.
Further, in the step S7, the overlap range of the sealing portion between the polypropylene adhesive tape and the viscoelastic adhesive tape is 100mm or more.
Compared with the prior art, the heat preservation construction process for the pipeline interface under extremely cold weather has the following advantages:
(1) The heat preservation construction process for the pipeline interface under extremely cold weather has the advantages of simple structure, reasonable design, good anti-corrosion effect, and scientific and reasonable setting of anti-corrosion interval time aiming at corresponding humidity of the environment, can be used for reducing operation difficulty through a heat preservation structure and the construction process, thereby avoiding expansion of anti-corrosion and heat-preservation materials, ensuring uniform heating through hot melting of an electric melting sleeve, avoiding edge curling or edge curling of a pipeline, and being easy to popularize.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of an overall structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an interface insulation preparation pipeline according to an embodiment of the present invention;
FIG. 3 is a schematic view of an installation height Wen Xingre shrink band process piping interface according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a thermal insulation foaming process pipeline interface according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a smoothing pipeline interface according to an embodiment of the present invention;
FIG. 6 is a schematic view of a pipe joint with a viscoelastic body adhesive tape according to an embodiment of the invention;
FIG. 7 is a schematic view of a pipe joint for installing a polypropylene adhesive tape according to an embodiment of the present invention.
Reference numerals illustrate:
1. high Wen Xingre shrink band; 2. a polyurethane heat-insulating layer; 3. electrothermal welding sleeves; 4. a viscoelastic body tape; 5. a viscoelastic body paste; 6. a polypropylene adhesive tape.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1 to 7, the heat preservation construction process suitable for the pipeline interface under extremely cold weather comprises the following steps:
s1, carrying out interface heat preservation preparation work on a pipeline;
the two pipeline joint parts are provided with heat insulation structures, each heat insulation structure comprises a high Wen Xingre shrink belt 1 with epoxy primer, a polyurethane heat insulation layer 2, an electric melting sleeve 3, a viscoelastic body adhesive tape 4, viscoelastic body adhesive pastes 5 and a polypropylene adhesive tape 6, the inner walls of the high temperature heat shrink belts 1 are fixedly sleeved on the 2 pipeline joint parts, the outer walls of the high Wen Xingre shrink belts 2 are sequentially fixedly sleeved with the polyurethane heat insulation layers 1 and the electric melting sleeve 3, the upper ends and the lower ends of the electric melting sleeve 3 are respectively fixedly connected with one viscoelastic body adhesive tape 5, the two ends of the outer walls of the electric melting sleeve 3 are respectively fixedly sleeved with one viscoelastic body adhesive tape 4, the viscoelastic body adhesive tapes 4 are covered on the outer walls of the viscoelastic body adhesive tapes 5, and the outer walls of each viscoelastic body adhesive tape 4 are fixedly sleeved with one polypropylene adhesive tape 6;
s2, carrying out anti-corrosion treatment on the pipeline interface part;
s3, planning and welding the electrothermal welding sleeve 3;
s4, a heat-insulating foaming polyurethane heat-insulating layer 2;
s5, smoothing the welding part through the viscoelastic body paste 5; in this embodiment, in order to ensure the sealing of the lap joint, after the heat preservation is completed, smoothing treatment is performed on the transverse weld joint, the circumferential weld joint material injection hole and the exhaust hole of the electric heating sleeve 3, and the adopted material is the viscoelastic body paste 5.
S6, sealing and protecting the lap joint of the electric-heating fusion sleeve 3 and transverse seams at two ends of the electric-heating fusion sleeve by adopting the viscoelastic body adhesive tape 4;
and S7, winding and protecting the sealing part of the viscoelastic body adhesive tape 4 by adopting the polypropylene adhesive tape 6.
The pipeline interface heat preservation construction process has the advantages that: simple structure, reasonable in design can reduce the operation degree of difficulty through insulation construction and this construction process, and antiseptic effect is good, sets up anticorrosive interval time to the corresponding humidity of environment, scientific and reasonable to avoid anticorrosive and thermal insulation material to appear the phenomenon of inflation, through hot melt electric heat melting sleeve, thereby can make the heating even, avoid the pipeline to appear raising one's edges or to fold scheduling problem, easily promote.
The interface thermal insulation preparation work in step S1 includes the steps of:
s11, performing rust removal cleaning on the surface of the pipeline at the joint part;
s12, cleaning the surface of the outer protective tube of the pipeline and the surface of the waterproof end cap.
In this embodiment, 1, preparation interface insulation:
1) The surface of the working steel pipe at the joint is subjected to rust removal and cleaning by adopting a hand-held mobile sand blasting and derusting sand blasting device, rust, steel rolling scales, grease, dust, paint, moisture or other pollutants are removed, the surface cleaning reaches the Sa2.5 level, the construction cannot be carried out on the hand-held mobile device at a special station, a manual operation angle grinder is adopted for cleaning, and the surface cleaning reaches the St3.0 level.
2) Cleaning the surface of the outer protective tube and the surface of the waterproof end cap of the pipeline, cleaning and drying all the joints with the heat-insulating electric-melting sleeves of the interfaces, and avoiding any factors affecting the hot-melting welding.
The specific construction process is as follows:
a) At the beginning and end of each shift, ambient temperature, relative humidity, steel pipe surface temperature and dew point temperature were recorded.
b) Before the abrasive is put into the sand storage tank, the abrasive should be ensured to be clean, the abrasive is kept dry and free of greasy dirt, and compressed air is strictly filtered.
c) And adopting a closed circulation recovery type sand blasting machine to perform sand blasting and rust removal on the surface of the exposed steel pipe.
d) If burrs, delamination, welding spatter, and other visual surface defects are present, the tool should be cleaned in a timely manner. Any surface defect with an area exceeding 50cm < 2 > and an area exceeding 5cm is re-sand derusted.
e) After the blasting is finished, clean compressed air is used for purging surface dust and impurities.
The antiseptic treatment in step S2 includes the steps of:
s21, carrying out anti-corrosion treatment on the exposed steel pipe part at the joint part by adopting a high Wen Xingre shrink belt 1;
s22, judging whether the relative humidity of the environment is greater than 80%, if yes, the anticorrosion interval time is less than or equal to 2 hours, otherwise, executing the step S23;
s23, judging whether the relative humidity of the environment is in a range of 70% -80%, if yes, the anticorrosion interval time is less than or equal to 3 hours, otherwise, executing the step S24;
s24, judging whether the relative humidity of the environment is less than or equal to 70%, if so, keeping the corrosion interval time to be less than or equal to 4 hours.
In this embodiment, 2, the bare steel pipe of welding part is anticorrosive:
and after the interface thermal insulation preparation work is finished, immediately adopting a high-temperature radiation crosslinked polyethylene thermal contraction belt to carry out corrosion prevention treatment on the exposed steel pipe part of the welding part. (the time of the preservation operation is related to the ambient humidity, and the time interval is not more than 2 hours when the relative humidity is more than 80%, not more than 3 hours when the relative humidity is more than 70% and less than 80%, and not more than 4 hours when the relative humidity is less than or equal to 70%).
a) And determining the length of the heat-shrinkable belt according to the pipe diameter, combining the length of the joint to be insulated, cutting off the heat-shrinkable belt, and ensuring the lap joint length of the heat-shrinkable belt and the waterproof end cap to be 40-45 mm.
b) And (5) preheating the surface. Preheating the node area by using propane gas, and preheating the surface temperature to 50-65 ℃; and controlling the surface temperature in real time by using a thermometer, and stopping heating when the temperature requirement is met.
c) One end of the heat shrinkable tape is placed in the middle of the splice so that the splice position winds the heat shrinkable tape around the steel pipe at 2 o 'clock or 10 o' clock and ensures a sufficient splice amount.
The base material of the under-lap joint of the heat shrinkage belt is preheated and rolled by a roller, so that the base material is well connected with the pipe body. The side of the end seal with the adhesive was then slightly preheated until gloss was present. The fixing sheet is covered at the overlapping position of the heat shrinkage belt and ensures the overlapping amount of at least 50 mm. Gradually heating the lap joint part, uniformly baking the fixing sheet by medium fire until the fixing sheet and the heat shrinkage belt are completely adhered without edge lifting and bubble, beating the part, continuously repeating from one end to the other end, lightly rolling and flattening the fixing sheet from the center of the heat shrinkage belt to the two ends by using gloves or pressing rollers in the heating process to tightly adhere the fixing sheet and the heat shrinkage belt, and trimming the lap joint part to be smooth.
d) After the fixing sheet is pressed, the middle part of the heat shrinkage belt is started, the baking process is started from the bottom, and the baking rule from bottom to top and from inside to outside is followed, so that bubbles are avoided, the flame length of the spray gun is adjusted, the spray gun is uniformly heated along the circumferential direction of the middle part of the heat shrinkage belt, the two ends of the heat shrinkage belt are sequentially heated after the middle part is shrunk, and the spray gun is required to move back and forth in the heating process so as to ensure that the heat shrinkage belt is not locally overheated.
e) When the adhesive of the heat shrinkage belt starts to uniformly ooze out from the edges of the two ends, shrinkage is completed, and the heat shrinkage belt is gently patted in the axial direction, so that uniform shrinkage effect is ensured. While the heat shrink band is still soft, the heat shrink band is gently rolled by a hand press roller, squeezing out air bubbles that may be covered by the heat shrink band. Rolling is continued from the weld position to both sides in the axial direction.
f) After the shrinkage is finished, checking whether the heat shrinkage belt and the fixing sheet have the edge-warping and bubble existence again, and if so, repairing and eliminating the bubble in time to ensure the flatness of the heat shrinkage belt and the fixing sheet.
g) And (5) lightly pulling the rear edge of the heat-shrinkable belt, detecting firmness, and ensuring that the heat-shrinkable belt is completely adhered to the pipeline. If bonding is to be enhanced, additional heating of the heat shrink tape is required.
h) And (5) checking. After the installation is finished, appearance inspection is carried out, the appearance surface is flat, no crease, no bubble and no charcoal burning and coking are carried out, and the hot melt adhesive obviously overflows from the two ends.
i) And (5) detecting leakage points. After the installation is completed, 100% leak point inspection is performed. The leak detection voltage of the electric spark leak detection is 15 KV to 25KV.
The planning and welding in step S3 comprises the steps of:
s31, measuring the length of a heat-insulation interface required by the pipeline interface part, and planning the position of the electric heating sleeve 3 according to the length of the electric heating sleeve 3;
s32, checking whether the electrothermal fuse of the electrothermal fuse sleeve 3 is broken or not;
s33, placing the electric melting sleeve 3 according to a planned position, and filling the gaps at the lap joint positions of the transverse joints at the two ends of the electric melting sleeve 3 with PE rods;
s34, hot melting the electric hot melting sleeve 3;
s35, sealing the interface part, and performing an air tightness test on the interface part.
In this embodiment, 3, electrothermal welding sleeve planning and welding:
a) And (3) measuring the length of the interface to be insulated, planning the position of the electric heating sleeve after calculating according to the length of the electric heating sleeve, ensuring that the lengths of the lap joints of the outer protective tubes at the two ends are consistent, and ensuring that the lap joints are larger than the width of the electric heating fuse of the electric heating sleeve and are not lower than 100mm in length.
b) Before the electrothermal sleeve is used, whether the electrothermal fuse is broken or not is checked, and if the electrothermal fuse is broken, the electrothermal fuse is required to be trimmed and welded again, so that a passage is ensured.
c) And placing the electric heating sleeve at a designated position according to a planned position, adopting a wood board with the thickness of 700 mm at the lap joint to be tightly fixed, adopting a PE hot melting rod to fill a gap at the lap joint of the transverse joint, ensuring the fusion effect of the lap joint of the transverse joint during hot melting, and adopting a rope tightener to tighten the electric heating sleeve, wherein the position of the rope tightener is the lap joint of the annular direction of the electric heating sleeve and the outer protective tube of the heat insulation pipeline.
d) And connecting a site temporary power supply or a generator, and setting welding time and hot-melting sleeve according to the pipe diameter and the thickness of the hot-melting sleeve.
e) The heat preservation interface should be sealed, and water seepage is not needed. And performing an airtight test on 100% of all heat preservation interfaces on site. Air or other gases are adopted in the airtight test of the heat preservation interface. The test is carried out after the hot melting part of the electric heating sleeve is cooled to below 40 ℃.
f) In the air tightness test, two holes are formed in the uppermost part of the electric melting sleeve by adopting a phi 25 hole puncher, the distance between the two holes is 250-300mm, one hole is provided with a pressure gauge, the other hole is connected with an air inlet pipe, an air pump is operated to inflate, the test pressure is 0.03Mpa, after the pressure is stabilized and maintained for 2min, soapy water is coated on the hot melting sealing parts of the circular seam and the longitudinal seam, and no air bubbles are generated. If bubbles are generated, marking is needed, repair welding is carried out on the air leakage by adopting a hot-melting extrusion welding gun, then an air tightness test is carried out again according to the requirements until reaching the standard, and the replacement of the electric-melting sleeve is considered to be reworked according to the situation.
The heat-insulating foaming in step S4 comprises the steps of:
s41, manufacturing a heat-insulating layer filler;
s42, knocking test is carried out after the heat preservation layer filling material is solidified;
s43, forming a polyurethane heat-insulating layer 2 after the interface heat-insulating foaming is finished, and sealing the opening of the electric-heating sleeve 3 to enable the polyurethane heat-insulating layer 2 and the electric-heating sleeve 3 to be welded.
In this example, 4, insulation foaming:
the interface thermal insulation foaming adopts mechanical foaming, ensures that polyurethane foaming materials are fully mixed, and the proportion of the raw materials is as follows:
black material: white material=1.3:1 (141B)
Black material: white material=1.5:1 (full water)
The mechanical equipment is debugged before daily use, polyurethane sample is made, foam quality is observed, and the mechanical equipment can be used after being qualified.
The excessive filling amount of polyurethane is not less than 70Kg/m 3 (the charging amount is properly increased in winter), the injection amount of polyurethane is calculated according to the length of the interface, and the density of the heat-insulating core part of the interface reaches 40-70Kg/m required by bidding 3 。
The specific construction process is as follows:
a) And (3) adjusting parameters such as raw material temperature, time and the like, starting a polyurethane foaming machine, injecting raw materials, and forming the heat-insulating layer filling material meeting the requirements. When the interface foams, polyurethane foam plastic should be filled in the whole interface, and a gap is not generated between the heat insulation layer at the interface and the heat insulation layer of the heat insulation pipe.
b) After foaming, a small amount of foam should overflow from the foaming holes, knocking test is carried out after the foam is completely solidified, polyurethane material supplementing is carried out if the foam is full and is lack of materials, foaming is carried out again, and PU remainder at the orifice is cleaned.
c) After the interface thermal insulation foaming is completed, the opening of the electrothermal sleeve should be sealed in time, the opening and the plug are heated simultaneously by a handheld hot-melting device in sealing, and the plug is rapidly arranged at the opening after the opening and the plug are sufficiently melted, so that the opening is welded and completely sealed.
And in the step S6, the overlapping range of the viscoelastic body adhesive tape 4 on the pipeline outer protective pipe and the electric heating melting sleeve 3 is more than or equal to 100mm.
In this example, 6, viscoelastic tape protective layer:
sealing the overlapping part of the electric heating sleeve and the pipeline by adopting the viscoelastic body adhesive tape, and starting from one end during winding, firstly winding for one circle in situ, then winding spirally, keeping certain tension, wherein the overlapping between the adhesive tapes is 10-20%, the overlapping range of the viscoelastic body adhesive tape to the external protective tube of the pipeline and the electric heating sleeve is more than or equal to 100mm, and the protection comprises the welding seam part of the transverse overlapping part of the electric heating sleeve.
And in the step S7, the overlap joint range of the sealing part of the polypropylene adhesive tape 6 and the viscoelastic body adhesive tape 4 is more than or equal to 100mm.
In this example, 7, protective layer of polypropylene adhesive tape:
and finally, winding and protecting the wound positions of the viscoelastic body by using a polypropylene adhesive tape, wherein the winding starts from one end, is performed in-situ winding for one circle, then is performed in spiral winding, a certain tension is maintained, the overlap joint between the adhesive tapes is 50-55%, the overlap joint range of the polypropylene adhesive tape and the protected positions of the viscoelastic body adhesive tape is more than or equal to 100mm, and the protection comprises the welding seam position of the transverse overlap joint of the electric hot-melting sleeve.
And (5) carrying out qualified identification on the finished surface and carrying out necessary protection on the finished product.
The specific description is as follows: if the prefabricated tile shell is adopted for heat preservation, the previous items 3 and 4 are needed to be reversed, the heat preservation tile shell is preassembled, and then electric melting sleeve protection is carried out.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The heat preservation construction process suitable for the pipeline joint under extremely cold weather is characterized by comprising the following steps of: the method comprises the following steps:
s1, carrying out interface heat preservation preparation work on a pipeline;
the heat insulation structure comprises a high Wen Xingre shrink belt (1), a polyurethane heat insulation layer (2), electric melting sleeves (3), viscoelastic body adhesive tapes (4), viscoelastic body pastes (5) and polypropylene adhesive tapes (6), wherein the inner wall of the high-temperature heat shrink belt (1) is fixedly sleeved on the 2 pipeline joint parts, the polyurethane heat insulation layer (2) and the electric melting sleeves (3) are sequentially fixedly sleeved on the outer wall of the high Wen Xingre shrink belt (1), the upper end and the lower end of each electric melting sleeve (3) are respectively fixedly connected with one viscoelastic body paste (5), the two ends of the outer wall of each electric melting sleeve (3) are respectively fixedly sleeved with one viscoelastic body adhesive tape (4), the viscoelastic body adhesive tapes (4) are covered on the outer wall of each viscoelastic body paste (5), and one polypropylene adhesive tape (6) is fixedly sleeved on the outer wall of each viscoelastic body adhesive tape (4);
s2, carrying out anti-corrosion treatment on the pipeline interface part;
s3, planning and welding the electrothermal welding sleeve (3);
s4, a heat-insulating foaming polyurethane heat-insulating layer (2);
s5, smoothing the welding part through the viscoelastic body paste (5);
s6, sealing and protecting the joint of the electric heating sleeve (3) and transverse seams at two ends of the electric heating sleeve by adopting the viscoelastic body adhesive tape (4);
s7, winding and protecting the sealing part of the viscoelastic body adhesive tape (4) by adopting a polypropylene adhesive tape (6);
the interface thermal insulation preparation work in step S1 includes the steps of:
s11, performing rust removal cleaning on the surface of the pipeline at the joint part;
s12, cleaning the surface of the outer protective tube of the pipeline and the surface of the waterproof end cap;
the antiseptic treatment in step S2 includes the steps of:
s21, carrying out anti-corrosion treatment on the exposed steel pipe part at the butt joint part by adopting a high Wen Xingre shrink belt (1);
s22, judging whether the relative humidity of the environment is greater than 80%, if yes, the anticorrosion interval time is less than or equal to 2 hours, otherwise, executing the step S23;
s23, judging whether the relative humidity of the environment is in a range of 70% -80%, if yes, the anticorrosion interval time is less than or equal to 3 hours, otherwise, executing the step S24;
s24, judging whether the relative humidity of the environment is less than or equal to 70%, if so, keeping the corrosion interval time to be less than or equal to 4 hours.
2. The heat preservation construction process for the pipeline interface under extreme cold weather according to claim 1, wherein the heat preservation construction process comprises the following steps: the planning and welding in step S3 comprises the steps of:
s31, measuring the length of a heat-insulation interface required by the pipeline interface part, and planning the position of the electric heating sleeve (3) according to the length of the electric heating sleeve (3);
s32, checking whether the electrothermal fuse of the electrothermal fuse sleeve (3) is broken or not;
s33, placing the electric heating sleeve (3) according to a planned position, and filling the gaps at the lap joint positions of the transverse seams at the two ends of the electric heating sleeve (3) with PE rods;
s34, hot-melting the electric-heating sleeve (3);
s35, sealing the interface part, and performing an air tightness test on the interface part.
3. The heat preservation construction process for the pipeline interface under extreme cold weather according to claim 2, wherein the heat preservation construction process comprises the following steps: the heat-insulating foaming in step S4 comprises the steps of:
s41, manufacturing a heat-insulating layer filler;
s42, knocking test is carried out after the heat preservation layer filling material is solidified;
s43, forming a polyurethane heat-insulating layer (2) after the interface heat-insulating foaming is finished, and sealing the opening of the electric-heating sleeve (3) to enable the polyurethane heat-insulating layer (2) and the electric-heating sleeve (3) to be welded.
4. The heat preservation construction process for the pipeline interface under extreme cold weather according to claim 3, wherein the heat preservation construction process comprises the following steps of: and in the step S6, the overlapping range of the viscoelastic body adhesive tape (4) on the pipeline outer protective pipe and the electric heating melting sleeve (3) is more than or equal to 100mm.
5. The heat preservation construction process for the pipeline interface under extreme cold weather according to claim 4, wherein the heat preservation construction process comprises the following steps: and in the step S7, the overlap joint range of the sealing positions of the polypropylene adhesive tape (6) and the viscoelastic body adhesive tape (4) is more than or equal to 100mm.
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| JPH05138367A (en) * | 1991-11-18 | 1993-06-01 | Nippon Steel Corp | Manufacture of heat insulating corrosion resistant double pipe |
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