CN203857140U - Direct-burial prefabricated independent thermal insulation layer sealing steam pipe with pipe bundle leakage alarm - Google Patents
Direct-burial prefabricated independent thermal insulation layer sealing steam pipe with pipe bundle leakage alarm Download PDFInfo
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- CN203857140U CN203857140U CN201420192868.1U CN201420192868U CN203857140U CN 203857140 U CN203857140 U CN 203857140U CN 201420192868 U CN201420192868 U CN 201420192868U CN 203857140 U CN203857140 U CN 203857140U
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Abstract
The utility model relates to a direct-burial prefabricated independent thermal insulation layer sealing steam pipe with pipe bundle leakage alarm. The steam pipe comprises a sealing corrugated pipe composite member, a steel guide pipe, a thermal insulation layer, leakage alarm indicator pipes, an outer protection steel pipe composite member, a steel guide pipe interface corrugated pipe composite member and a working steel pipe, wherein the sealing corrugated pipe composite member is welded with one end of the steel guide pipe in a sealing way; the thermal insulation layer is arranged outside the steel guide pipe; a plurality of leakage alarm indicator pipes horizontally penetrate between the steel guide pipe and the outer protection steel pipe composite member; the steel guide pipe interface corrugated pipe composite member is sleeved in a gap between the steel guide pipe and the sealing corrugated pipe composite member; the working steel pipe penetrates and is sleeved in the steel guide pipe. Compared with the prior art, the direct-burial prefabricated independent thermal insulation layer sealing steam pipe with pipe bundle leakage alarm has the beneficial effects that the perpetual thermal insulation layer is independently sealed, the heat insulation performance of a thermal insulation pipe is kept for a long time, overtemperature prevention measures are adopted on the external surface, the service life is long, the interface leakage alarm and positioning pipe bundles are mounted, the leakage state is monitored in real time, a corrugated pipe assembly used for a steel guide pipe interface is provided, and the installation is convenient.
Description
Technical field
The utility model relates to the direct-burried prefabricated thermal insulation steam line that working medium is steam, relates in particular to a kind of direct-burried prefabricated thermal insulation steam tube that thermal insulation layer is independent sealed, reveal warning and locating function with tube bank that has.
Background technique
At present, in engineering, direct-burried prefabricated thermal insulation steam tube used is most for adopting calcium silicate watt, centrifugally glass-wool, rock wool or aluminium silicate wool to carry out " steel sleeve steel " pipe of insulation.The thermal insulation layer of the every pipeline of product general tree of conventional construction mode carries out independent sealed protection, in delivery, deposit, in construction, if run into the situation that rainy weather or construction environment phreatic line surpass pipe laying absolute altitude, the thermal insulation layer of pipeline may large size be subject to water logging, cause starting in heating coil process humidity discharging amount at pipeline large, the humidity discharging time is long, and then the destruction of causing pipe insulating layer just to suffer varying degree during heating coil in the early stage, and cannot intuitively observe the serviceable condition of thermal insulation layer in view of directly buried pipeline, even if find the impaired reality that also cannot keep in repair of thermal insulation layer, a lot of high water level, rainy season or tap water, the Buried Steam Pipe of constructing under the conditions such as sewer line leakage is from bringing into operation just in bad keeping warm mode, cause pipeline heat waste large, pipeline external surface temperature is high, not only wasted the energy, and can cause gradually the long-term overtemperature of outer protective layer to damage, have a strong impact on the working life of Buried Steam Pipe.
In Buried Steam Pipe running, due to construction, anti-report layer quality etc. reason, the interface position leakage that is prone to pipeline external protective steel tube causes underground water to enter thermal insulation layer, there is violent humidity discharging situation in pipeline, owing to cannot accurately locating leak point, the humidity discharging time is generally very long, several days or several weeks, the thermal insulation layer of influenced pipeline is all can be in various degree impaired and cannot repair, even if found leak point, solved leakage problem, the thermal insulation layer of damage but cannot be repaired, cause pipeline to occur once revealing, thermal insulation property and life-span are just once impaired, final result is that Buried Steam Pipe is retired in advance.The ubiquity of these practical problems above, cause not the direct-burried prefabricated thermal insulation steam tube that thermal insulation layer is carried out to reliable sealing processing to be difficult to really be applicable to the steam pipe line engineering that high water level lays environment or rainy season construction, be also difficult to keep long-term, stable operation and reach expected service life under this such environment.
Summary of the invention
The utility model overcomes the deficiencies in the prior art, provide a kind of and thermal insulation layer is carried out to sealed-for-life processing, outer surface taked anti-overtemperature measure, interface is installed reveals and report to the police and location tube bank, and with steel conduit interface the direct-burried prefabricated thermal insulation steam tube with bellows component.
In order to achieve the above object, the utility model is realized by the following technical solutions:
The independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank, comprises seal bellows assembly parts, steel conduit, thermal insulation layer, leakage warning indicator tube, external protective steel tube assembly parts, steel conduit interface combined bellows part and working steel tube; Described seal bellows assembly parts and steel conduit one end seal welding, steel conduit peripheral hardware thermal insulation layer, several leakage warning indicator tubes are transverse between steel conduit and external protective steel tube assembly parts, steel conduit interface combined bellows part is sleeved in the space between steel conduit and seal bellows assembly parts, wears working steel tube in steel conduit.
Described seal bellows assembly parts is comprised of seal bellows assembly, seal bellows connecting tube, sealing ring flat-plate A and guiding ring flat-plate, one end of seal bellows connecting tube is together with seal bellows components welding, the other end connects respectively sealing ring flat-plate A and guiding ring flat-plate, seal bellows assembly outside voluble wrapping aerogel thermal insulating material.
Described external protective steel tube assembly parts is comprised of external protective steel tube and desuperheat transition tube, and desuperheat transition tube is sleeved on external protective steel tube two ends and at reducing place, desuperheat transition tube both sides seal welding, external protective steel tube and desuperheat transition tube gap≤10mm.
Described external protective steel tube assembly parts outer surface is established outer protective layer after sandblast or Shot Blasting, and outer protective layer is SPUA, 3PE, melting epoxy powder, machinery is wound around glass fibre enhancing thermosetting resin and other meet the anti-corrosion material of the anticorrosion standard of buried metal pipeline.
Described steel conduit interface combined bellows part is comprised of with metal bellows with bellows component connecting tube and steel conduit interface steel conduit interface, and steel conduit interface is used respectively the sealed at both ends welding of metal bellows with bellows component connecting tube with steel conduit interface.
Described thermal insulation layer is centrifugally glass-wool thermal insulation layer.
Described thermal insulation layer peripheral hardware reflecting layer, reflecting layer is glass fibre composite aluminium foil cloth, with restraint zone, ties up.
Described leakage warning indicator tube is by the sealing ring flat-plate B supporting and location on the sealing ring flat-plate A on seal bellows assembly parts, guiding ring flat-plate and steel conduit, and with sealing ring flat-plate A, B seal welding, pipe end extends to outside both sides sealing ring flat-plate, described leakage warning indicator tube is 8, uniform within the scope of upper semicircumference, pipe end adopts pipe plug sealing.
Described sealing ring flat-plate B also can be substituted by seal bellows assembly parts.
Compared with prior art, the beneficial effects of the utility model are:
1) single pipe thermal insulation layer is realized to permanent water-resistant sealing, can make the thermal insulation layer of pipeline avoid making moist or endangered by water logging in the whole process of operation in delivery, guarantee for a long time the thermal and insulating performance of thermal insulation pipe.Revealing fault state, protection thermal insulation layer can not be subject to air-flow or the underground water infringement of inside and outside leakage, reduces causality loss, guarantees steam pipe line reliability of operation steady in a long-term;
2) set up desuperheat transition tube, the heat bridge effect that prevents thermal insulation layer sealing configuration causes external protective steel tube overtemperature to damage outer protective layer, extension steam pipe working life;
3) steel conduit interface is contained in the structure of seal bellows inner chamber with corrugated metal pipe components lining, can absorb the axial thermal expansion of steel conduit under in working order;
4) by bundled tube, reveal the outfit of warning indicator tube, realized the real-time monitoring to each interface position outward leakage state in steam line running;
5) the utility model is very outstanding to the tolerance of high water level construction and running environment; the construction of high water level environment is without special waterproofing protection measure; difficulty of construction is low; in construction, thermal insulation layer can not make moist or water logging; while starting operation, humidity discharging and baking pipe time greatly shorten; move more stablely, expected life is longer.
6) can greatly reduce to reveal causality loss and maintenance cost, Economy is outstanding, if configuration vacuumizes facility, can further reduce pipeline heat loss, has obvious Practical significance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1. working steel tube 2. steel conduit 3. steel conduit interfaces are revealed warning indicator tube 16. pipe plugs with bellows component connecting tube 4. external protective steel tube 5. desuperheat transition tube 6. seal bellows assembly 7. steel conduit interfaces with metal bellows 8. outer protective layer 9. sealing ring flat-plate A10. seal bellows connecting tube 11. guiding ring flat-plate 12. centrifugally glass-wool thermal insulation layer 13. glass fibre composite aluminium foil cloth 14. sealing ring flat-plate B 15..
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
See Fig. 1, it is structural representation of the present utility model, the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in the utility model tube bank, comprises seal bellows assembly parts, steel conduit 2, thermal insulation layer, leakage warning indicator tube 15, external protective steel tube assembly parts, steel conduit interface combined bellows part and working steel tube 1; Described seal bellows assembly parts and steel conduit 2 one end seal weldings, steel conduit 2 peripheral hardware thermal insulation layers, several leakage warning indicator tubes 15 are transverse between steel conduit 2 and external protective steel tube assembly parts, steel conduit interface combined bellows part is sleeved in the space between steel conduit 2 and seal bellows assembly parts, wears working steel tube 1 in steel conduit 2.
Described seal bellows assembly parts is comprised of seal bellows assembly 6, seal bellows connecting tube 10, sealing ring flat-plate A9 and guiding ring flat-plate 11, one end and seal bellows assembly 6 that seal bellows connects 10 pipes weld together, the other end connects respectively sealing ring flat-plate A9 and guiding ring flat-plate 11, seal bellows assembly 6 outside voluble wrapping aerogel thermal insulating materials.
Described external protective steel tube assembly parts is comprised of external protective steel tube 4 and desuperheat transition tube 5, and desuperheat transition tube 5 is sleeved on external protective steel tube 4 two ends and at desuperheat transition tube 5 reducing place, both sides seal weldings, external protective steel tube 4 and desuperheat transition tube 5 gaps≤10mm.
Described external protective steel tube assembly parts outer surface is established outer protective layer 8 after sandblast or Shot Blasting, and for SPUA, 3PE, melting epoxy powder, machinery are wound around, glass fibre strengthens thermosetting resin to outer protective layer 8 and other meet the anti-corrosion material of the anticorrosion standard of buried metal pipeline.
Described steel conduit interface combined bellows part is comprised of with metal bellows 7 with bellows component connecting tube 3 and steel conduit interface steel conduit interface, and steel conduit interface is used respectively the sealed at both ends welding of metal bellows 7 with bellows component connecting tube 3 with steel conduit interface.
Described thermal insulation layer is centrifugally glass-wool thermal insulation layer 12.
Described thermal insulation layer peripheral hardware reflecting layer, reflecting layer is glass fibre composite aluminium foil cloth 13, with restraint zone, ties up.
Described leakage warning indicator tube 15 is by the sealing ring flat-plate B14 supporting and location on the sealing ring flat-plate A9 on seal bellows assembly parts, guiding ring flat-plate 11 and steel conduit 2, and with sealing ring flat-plate A9, B14 seal welding, pipe end extends to outside both sides sealing ring flat-plate; Described leakage warning indicator tube 15 is 8, uniform within the scope of upper semicircumference, and pipe end adopts pipe plug 16 sealings.
Described sealing ring flat-plate B14 also can be substituted by seal bellows assembly parts.
The manufacture method that the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank described in the utility model is as follows:
1) two seal bellows connecting tubes 10 are welded to connect with the two ends of seal bellows assembly 6 respectively, then at the two ends of connecting tube 10, connect respectively sealing ring flat-plate A9 and guiding ring flat-plate 11, complete seal bellows assembly parts, in installation process, confirm on sealing ring flat-plate A9 and guiding ring flat-plate 11 for aligning one by one by revealing the hole of warning indicator tube 15;
2) pipe end of ring flat-plate 11 1 sides that lead in seal bellows assembly parts is connected with steel conduit 2 seal weldings, butt welded seam carries out airtight experiment, repairs if desired and test again, until meet air tightness test requirement;
3) in other one end of steel conduit 2, will seal ring flat-plate B14 location, and guarantee for revealing warning indicator tube 15 hole of passing through and the hole of leading on ring flat-plate 11, to align one by one on ring flat-plate, sealing ring flat-plate B14 and steel conduit 2 will be welded to connect;
4) between guiding ring flat-plate 11 and sealing ring flat-plate B14, be wound around centrifugally glass-wool thermal insulation layer 12, thermal insulation layer is wound around glass fibre composite aluminium foil cloth 13 outward, with restraint zone, ties up; At the outside of seal bellows assembly 6 voluble wrapping aerogel thermal insulating material;
5) leakage warning indicator tube 15 is penetrated one by one to sealing ring flat-plate A9, guiding ring flat-plate 11 and centrifugally glass-wool thermal insulation layer 12, and the corresponding aperture from sealing ring flat-plate B14 passes, tighten one by one and reveal warning indicator tube 15, adjust and reveal warning indicator tube 15 end extended lengths, it is fixed with sealing ring flat-plate A9 and sealing ring flat-plate B14 seal welding respectively; So far the assembly parts completing is called " steel conduit assembly parts ";
6) external protective steel tube 4 is connected with desuperheat transition tube 5 location the seal welding at two ends, forms " external protective steel tube assembly parts ";
7) by " external protective steel tube assembly parts " outer surface through sandblast or Shot Blasting, after cleaning, make in its surface outer protective layer 8;
8) " the external protective steel tube assembly parts " of carrying out outer protective layer 8 worn and located with " steel conduit assembly parts ";
9) sealing ring flat-plate A9, sealing ring flat-plate B14 are connected with the internal surface seal welding of external protective steel tube 4 respectively, the assembly parts so far completing is called " independent sealed insulation assembly parts ";
10) by interim auxiliary hole, " independent sealed insulation assembly parts " carried out to air tightness test until meet the demands;
11) together with " independent sealed insulation assembly parts " is set on working steel tube 1, with positioning ring, locate temporarily, guarantee gap≤20mm, form " integral tube ";
12) two steel conduit interfaces are connected by the two ends difference seal welding of metal bellows 7 with a steel conduit interface with bellows component connecting tube 3, form " steel conduit interface combined bellows part ";
13) " steel conduit interface combined bellows part " is sleeved in the space between steel conduit 2 and seal bellows assembly 6, with positioning ring, " steel conduit interface combined bellows part " and steel conduit 2 is temporary fixed;
14) adopt positioning ring at the two ends of steel conduit 2, working steel tube 1 is temporary fixed.
The working steel tube 1 that the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in the utility model tube bank is placed in steel conduit 2, by steel conduit 2, provides support and move guiding.Described steel conduit and and working steel tube between adopt positioning ring to fix, gap≤20mm.
The sealing means at thermal insulation layer two ends is sealed-for-life, adopts the effect of seal bellows assembly 6 sealings to be the axial thermal expansion being in operation with the common absorption steel conduit 2 of metal bellows 7 with steel conduit interface, realizes the sealing of thermal insulation layer one end simultaneously.The sealing of the other one end of thermal insulation layer can adopt 6 sealings of identical seal bellows assembly, also can adopt sealing ring flat-plate to carry out simple seal.The sealing function of this mode of structure can make the thermal insulation layer of pipeline avoid making moist or endangered by water logging in the whole process of operation in delivery, guarantees for a long time the thermal and insulating performance of thermal insulation pipe.Revealing fault state, protection thermal insulation layer can not be subject to air-flow or the underground water infringement of inside and outside leakage, reduces causality loss, guarantees steam pipe line reliability of operation steady in a long-term.
Be contained in advance leakage warning indicator tube 15 in steam tube with on pipeline between two adjacent fixed knots each interface position be communicated with respectively, realize interface outward leakage warning function.On every pipeline, all adopt 8 to reveal warning indicator tube 15, uniform within the scope of clock 180 degree of 9 o'clock to 3 o'clock, connect whole pipe, the pipe end of indicator tube 15 extends in outside sealed at both ends ring flat-plate, adopt pipe plug 16 airtight, in practice of construction, different indicator tubes 15 are connected with the special interface region between adjacent two fixed knots on pipeline, are used to indicate the outward leakage situation of this region interface.
Spacing between desuperheat transition tube 5 and external protective steel tube 4 is not more than 10mm, and its effect is to prevent that the heat bridge effect of thermal insulation layer sealing configuration from causing external protective steel tube 4 overtemperatures to damage outer protective layer 8.
Steel conduit interface adopts corrugated metal pipe components lining to be contained in the mode of structure of seal bellows inner chamber, during steel conduit 2 interface between pipeline and pipeline, the steel conduit interface that lining is contained in to pipe end seal bellows inner chamber is pulled out location by corrugated metal pipe components, and two ends steel conduit interface is connected with steel conduit 2 seal weldings with bellows connecting tube 3 ends.Its function is to absorb the axial thermal expansion of steel conduit under in working order.Described metal bellows adopts SUS316L material.
During work, working steel tube 1 expanded by heating in the displacement of the interior generation axial thermal expansion of steel conduit 2, is absorbed by the canceller in same compensating unit in pipeline.The axial thermal expansion displacement of steel conduit 2 is absorbed by " steel conduit interface combined bellows part " between every two steam tubes.
As further improvement of the utility model, can be as required at the utility model or the prefabricated thermal insulation pipe fitting with same structure feature, connect in the pipe-line system forming, increase to vacuumize interface and when operation, to connect vaccum-pumping equipment and segmentation is carried out in the space between working steel tube 1 and steel conduit 2 vacuumize, be conducive to further reduce pipeline heat loss.
As a kind of improvement of the present utility model, can adopt supporting cathodic protection anti-corrosion of metal measure to provide anti-corrosion protection to working steel tube 1 and external protective steel tube 4.
Between steam tube described in the utility model and with the connection part repaired mouth of other pipe fittings, piping attachment, adopt or the mutually heat insulation and mode of structure of compatibility identical with the utility model, other necessaries are not within the scope of present patent application.
Claims (9)
1. the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank, it is characterized in that, comprises seal bellows assembly parts, steel conduit, thermal insulation layer, leakage warning indicator tube, external protective steel tube assembly parts, steel conduit interface combined bellows part and working steel tube; Described seal bellows assembly parts and steel conduit one end seal welding, steel conduit peripheral hardware thermal insulation layer, several leakage warning indicator tubes are transverse between steel conduit and external protective steel tube assembly parts, steel conduit interface combined bellows part is sleeved in the space between steel conduit and seal bellows assembly parts, wears working steel tube in steel conduit.
2. the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank according to claim 1, it is characterized in that, described seal bellows assembly parts is comprised of seal bellows assembly, seal bellows connecting tube, sealing ring flat-plate A and guiding ring flat-plate, one end of seal bellows connecting tube is together with seal bellows components welding, the other end connects respectively sealing ring flat-plate A and guiding ring flat-plate, seal bellows assembly outside voluble wrapping aerogel thermal insulating material.
3. the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank according to claim 1, it is characterized in that, described external protective steel tube assembly parts is comprised of external protective steel tube and desuperheat transition tube, desuperheat transition tube is sleeved on external protective steel tube two ends and at reducing place, desuperheat transition tube both sides seal welding, external protective steel tube and desuperheat transition tube gap≤10mm.
4. according to the tube bank described in claim 1 or 3, reveal the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer, it is characterized in that, described external protective steel tube assembly parts outer surface is established outer protective layer after sandblast or Shot Blasting, and outer protective layer is SPUA, 3PE, melting epoxy powder, machinery is wound around glass fibre enhancing thermosetting resin and other meet the anti-corrosion material of the anticorrosion standard of buried metal pipeline.
5. the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank according to claim 1, it is characterized in that, described steel conduit interface combined bellows part is comprised of with metal bellows with bellows component connecting tube and steel conduit interface steel conduit interface, and steel conduit interface is used respectively the sealed at both ends welding of metal bellows with bellows component connecting tube with steel conduit interface.
6. the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank according to claim 1, it is characterized in that, described thermal insulation layer is centrifugally glass-wool thermal insulation layer.
7. according to the tube bank described in claim 1 or 6, reveal the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer, it is characterized in that, described thermal insulation layer peripheral hardware reflecting layer, reflecting layer is glass fibre composite aluminium foil cloth, with restraint zone, ties up.
8. the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank according to claim 1, it is characterized in that, described leakage warning indicator tube is by the sealing ring flat-plate B supporting and location on the sealing ring flat-plate A on seal bellows assembly parts, guiding ring flat-plate and steel conduit, and with sealing ring flat-plate A, B seal welding, pipe end extends to outside both sides sealing ring flat-plate; Described leakage warning indicator tube is 8, uniform within the scope of upper semicircumference, and pipe end adopts pipe plug sealing.
9. the independent sealed steam tube of warning direct-burried prefabricated thermal insulation layer revealed in tube bank according to claim 8, it is characterized in that, described sealing ring flat-plate B also can be substituted by seal bellows assembly parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420192868.1U CN203857140U (en) | 2014-04-18 | 2014-04-18 | Direct-burial prefabricated independent thermal insulation layer sealing steam pipe with pipe bundle leakage alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420192868.1U CN203857140U (en) | 2014-04-18 | 2014-04-18 | Direct-burial prefabricated independent thermal insulation layer sealing steam pipe with pipe bundle leakage alarm |
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| Publication Number | Publication Date |
|---|---|
| CN203857140U true CN203857140U (en) | 2014-10-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420192868.1U Withdrawn - After Issue CN203857140U (en) | 2014-04-18 | 2014-04-18 | Direct-burial prefabricated independent thermal insulation layer sealing steam pipe with pipe bundle leakage alarm |
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| Country | Link |
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| CN (1) | CN203857140U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912731A (en) * | 2014-04-18 | 2014-07-09 | 辽宁久大管业有限公司 | Directly-buried prefabricated independently-sealed steam tube with tube bundle leakage warning function and heat-insulation layer, and method for manufacturing directly-buried prefabricated independently-sealed steam tube |
| CN111503429A (en) * | 2020-04-07 | 2020-08-07 | 天津太合节能科技有限公司 | Pipe plug and system of direct-buried heat-insulation pipeline and sealing method of end face of direct-buried heat-insulation pipeline |
-
2014
- 2014-04-18 CN CN201420192868.1U patent/CN203857140U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912731A (en) * | 2014-04-18 | 2014-07-09 | 辽宁久大管业有限公司 | Directly-buried prefabricated independently-sealed steam tube with tube bundle leakage warning function and heat-insulation layer, and method for manufacturing directly-buried prefabricated independently-sealed steam tube |
| CN111503429A (en) * | 2020-04-07 | 2020-08-07 | 天津太合节能科技有限公司 | Pipe plug and system of direct-buried heat-insulation pipeline and sealing method of end face of direct-buried heat-insulation pipeline |
| CN111503429B (en) * | 2020-04-07 | 2024-04-12 | 天津太合节能科技有限公司 | Pipe plug and system of direct-buried heat-insulating pipeline and end face sealing method of direct-buried heat-insulating pipeline |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141001 Effective date of abandoning: 20151216 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |