CN110966465A - Marine natural gas storage tank double-layer pipeline and manufacturing method thereof - Google Patents

Abstract

The invention provides a marine natural gas storage tank double-layer pipeline and a manufacturing method thereof. The utility model provides a marine natural gas storage tank double-layer pipeline includes that inner tube and cover locate the sleeve pipe in the inner tube outside, and the inner tube is equipped with the straight portion of inner tube and inner tube bight, and the sleeve pipe includes the straight portion of sleeve pipe and sleeve pipe bight, and sleeve pipe bight corresponds the setting with inner tube bight, and the straight portion of sleeve pipe corresponds the setting with the straight portion of inner tube, and sleeve pipe bight includes a plurality of mitre pipes, and a plurality of mitre pipes weld each other the concatenation form sleeve pipe bight, connects through sleeve pipe bight between two sleeve pipe straight portions. In the natural gas storage tank double-layer pipeline and the manufacturing method thereof, the welding seams of the natural gas storage tank double-layer pipeline are a plurality of annular welding seams which are connected among a plurality of oblique pipes and connected between the oblique pipes and the straight part of the sleeve. The length of the annular welding line of the double-layer pipeline of the natural gas storage tank is far smaller than that of the axial welding line, and the double-layer pipeline of the natural gas storage tank is convenient to machine and manufacture.

Description

Marine natural gas storage tank double-layer pipeline and manufacturing method thereof

Technical Field

The invention relates to the field of ocean platforms, in particular to a marine natural gas storage tank double-layer pipeline and a manufacturing method thereof.

Background

CCS Natural gas Fuel powered Ship Specification 4.1.3.8 specifies that the pipeline between the C-type independent fuel tank and the first stop valve connected with the C-type independent fuel tank is equivalent to the safety level of the C-type independent fuel tank. "

In order to meet the technical specification requirements, a double-layer pipeline needs to be designed and installed, the stainless steel pipeline and the stainless steel sleeve are bent by adopting a uniform bending radius, then the stainless steel sleeve is uniformly split and halved along the axial direction, after the elbow and the stainless steel pipeline are welded, the halved stainless steel sleeve and the stainless steel pipeline are assembled and sleeved, and then welding and splicing are carried out. The stainless steelcasing splice weld 100 is shown in FIG. 1, where theweld 100 extends in the axial direction of the stainless steel casing and is two. Moreover, because the number of pipelines below the highest liquid level is large, the welding and assembling workload is large in the process of manufacturing the stainless steel sleeve, the production and the manufacturing are not facilitated, and meanwhile, because deviation exists in the manufacturing process, segregation exists between the stainless steel pipeline and the stainless steel sleeve, and the later normal use is influenced.

Disclosure of Invention

The invention aims to provide a natural gas storage tank double-layer pipeline which reduces welding seams and is convenient to produce and manufacture and a manufacturing method thereof.

The utility model provides a marine natural gas storage tank double-deck pipeline, locates including inner tube and cover the sleeve pipe in the inner tube outside, the inner tube is equipped with the straight portion of inner tube and inner tube curved portion, the sleeve pipe includes the straight portion of sleeve pipe and sleeve pipe curved portion, sleeve pipe curved portion with inner tube curved portion corresponds the setting, the straight portion of sleeve pipe with the straight portion of inner tube corresponds the setting, sleeve pipe curved portion includes a plurality of mitre pipes, and is a plurality of the mitre pipe welds the concatenation each other and forms sleeve pipe curved portion, two pass through between the straight portion of sleeve pipe the sleeve pipe curved portion is connected.

In one embodiment, the diameter of the beveled tube is equal to the diameter of the straight portion of the sleeve.

In one embodiment, the inner pipe bend and the sleeve bend comprise a plurality of pipe bends.

In one embodiment, the inner diameter of the sleeve is greater than the outer diameter of the inner tube, and a gap exists between the sleeve and the inner tube.

In one embodiment, a limiting structure is arranged at an end of the inner pipe straight part, and the limiting structure is supported between the outer side wall of the inner pipe and the inner side wall of the sleeve.

In one embodiment, the number of the limiting structures is multiple, the limiting structures are kept on the same circumference, and the limiting structures mutually enclose a through hole for the straight part of the inner pipe to pass through.

In one embodiment, the limiting structure comprises a heat insulation plate and a supporting plate, the supporting plate is arranged on the inner side wall of the sleeve, one end of the heat insulation plate is connected with the supporting plate through a screw, and the other end of the heat insulation plate is abutted to the outer side wall of the inner pipe.

A manufacturing method of a double-layer pipeline of a natural gas storage tank for a ship comprises the following steps:

the linear inner pipe penetrates through a first straight sleeve part of the sleeve, the first straight sleeve part is arranged at the first straight inner pipe part of the inner pipe, and a second straight inner pipe part at the end part of the inner pipe is exposed;

bending the exposed inner pipe to form an inner pipe bending part between the first inner pipe straight part and the second inner pipe straight part;

the straight part of the second inner pipe penetrates through the plurality of oblique cutting pipes, the oblique cutting pipes are welded and connected from the end face of the straight part of the first sleeve pipe, the oblique cutting pipes are mutually welded and connected to form a sleeve pipe bent part, and the sleeve pipe bent part is matched with the inner pipe bent part;

the second inner pipe straight part penetrates through the second sleeve straight part, the end face of the second sleeve straight part is connected with the end face of the beveled pipe in a welding mode, and the second sleeve straight part is connected with the sleeve bent part.

In one embodiment, the end of the inner pipe straight portion is provided with a plurality of limiting structures, the limiting structures mutually enclose a through hole, and when the inner pipe straight portion passes through the sleeve pipe straight portion, the inner pipe straight portion needs to pass through the through hole.

In one embodiment, the number of the second inner pipe straight portion, the number of the inner pipe bent portions, the number of the sleeve bent portions, and the number of the second sleeve straight portions are two, and the two sleeve bent portions are sequentially welded between the first sleeve straight portion and the two second sleeve straight portions respectively.

In the double-layer pipeline of the natural gas storage tank and the manufacturing method thereof, the straight part of the first sleeve is sleeved in the middle of the inner pipe. And then the inner tank is bent into the shape required by the design. And respectively sleeving a plurality of oblique cutting pipes on the inner pipes. The plurality of beveled pipes are welded along the angle of the inner pipe bent portion to form a sleeve bent portion. When the manufacture of the sleeve bending part is finished, the second sleeve straight part is sleeved, and the second sleeve straight part is connected with the inclined cutting pipe in a welding mode, so that the manufacture of the double-layer pipeline is finished. In the natural gas storage tank double-layer pipeline and the manufacturing method thereof, the welding seams of the natural gas storage tank double-layer pipeline are a plurality of annular welding seams which are connected among a plurality of oblique pipes and connected between the oblique pipes and the straight part of the sleeve. Compared with the traditional manufacturing method of the double-layer pipeline of the natural gas storage tank, the length of the annular welding line of the double-layer pipeline of the natural gas storage tank is far smaller than that of the axial welding line, and the double-layer pipeline of the natural gas storage tank is convenient to machine and manufacture. Moreover, the sleeve does not need to be cut into half according to the axial direction of the sleeve, a large amount of cutting work can be reduced, and the sleeve is convenient to manufacture.

Drawings

FIG. 1 is a splice weld of a conventional double pipe casing;

fig. 2 is a schematic structural view of the marine natural gas storage tank double-walled pipe of the present embodiment;

fig. 3 is a schematic view of a supporting mechanism of the double-layered pipe of the marine natural gas tank shown in fig. 2;

fig. 4 is a flowchart of a method for manufacturing a double-walled pipe for a natural gas tank for a ship according to the present embodiment.

The reference numerals are explained below: 1. a marine natural gas storage tank double-layer pipeline; 10. an inner tube; 11. an inner tube straight portion; 111. a first inner tubular straight portion; 112. a second inner tubular straight portion; 12. an inner tube bend; 20. a sleeve; 21. a straight portion of the sleeve; 211. a first sleeve straight portion; 212. a second sleeve straight portion; 22. a sleeve bend; 221. obliquely cutting a pipe; 30. a limiting structure; 31. a heat insulation plate; 32. a support plate; 33. a fastener; 34. a waist hole.

Detailed Description

While this invention is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated.

Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

The preferred embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to fig. 2, the invention provides a marine natural gas storage tank double-layer pipeline and a manufacturing method thereof.

The marine natural gas storage tank double-layered pipeline 1 of the present embodiment includes aninner pipe 10 and asleeve 20 fitted around the outer side of theinner pipe 10. Thesleeve 20 is a stainless steel sleeve. Theinner pipe 10 is a stainless steel pipe. Theinner pipe 10 is used for running a natural gas medium and is used for meeting the requirements of a process system. The stainless steel pipe guarantees the intensity and the rigidity of inner tube, satisfies the operation requirement of natural gas storage tank pipeline. Thesleeve 20 serves to insulate theinner pipe 10 and, at the same time, to generate leakage if cracks are generated at the connection portion of theinner pipe 10 and the joint or the connection portion of theinner pipe 10. Thesleeve 20 acts as a secondary shield to prevent cryogenic natural gas from leaking to the hull deck.

Specifically, theinner pipe 10 is provided with an inner pipestraight portion 11 and an inner pipebent portion 12. And bending and molding the inner pipe according to design requirements. The inner pipestraight part 11 is used for extending to a bending part, and the bending part is provided with an innerpipe bending part 12. The innerpipe bending part 12 enables the inner pipestraight part 11 to change the direction, and design requirements are conveniently met.

Theinner tube 10 is a one-piece tube. Theinner tube 10 of integral type structure can satisfy the intensity demand of inner tube to guarantee that theinner tube 10 can stably use.

Thesleeve 20 includes a sleevestraight portion 21 and a sleevebent portion 22. Thesleeve bend 22 is disposed to correspond to theinner pipe bend 12. The sleevestraight portion 21 is provided corresponding to the inner pipestraight portion 11.

Thecasing bend 22 comprises a plurality ofchamfered tubes 221. The plurality ofchamfered tubes 221 are welded to each other to form thecasing bend 22. The twostraight portions 21 are connected by abent portion 22.

The diameter of thebeveled tube 221 is equal to the diameter of thestraight portion 21 of the sleeve. Thebeveled tube 221 is beveled from thestraight portion 21 of the sleeve. The curvature of thebent portion 22 of the casing formed by splicing the plurality ofchamfered tubes 221 can be adjusted by adjusting the angle of the end surface of the chamferedtube 221.

Theinner pipe bend 12 and thesleeve bend 22 include a plurality of them. In particular, in the present embodiment, the marine natural gas tank double-layered pipeline has an S-shape. Both theinner tube 10 and thesleeve 20 are S-shaped. The number of the inner pipestraight portions 11 and the number of the sleevestraight portions 21 are three. The inner-tubestraight portion 11 includes a first inner-tubestraight portion 111 located in the middle and second inner-tubestraight portions 112 located at both ends of the first inner-tubestraight portion 111. Accordingly, thestraight sleeve portion 21 includes a firststraight sleeve portion 211 at the middle and secondstraight sleeve portions 212 at both ends of the firststraight sleeve portion 211.

Theinner pipe bend 12 and thesleeve bend 22 are two in number. Two adjacent inner pipestraight portions 11 are connected by an inner pipebent portion 12. Two adjacentstraight portions 21 are connected by abent portion 22.

It is understood that in other embodiments, the number of the inner pipestraight portion 11 and the sleevestraight portion 21 may be 2, 4, etc. The number of the inner pipebent portion 12 and the sleevebent portion 22 is 1, 2, or the like. Therefore, the shape of the double-layer pipeline of the natural gas storage tank for the ship can be triangular, wavy and the like. The shapes of theinner tube 10 and thesleeve 20 are not limited herein.

The inner diameter of thesleeve 20 is larger than the outer diameter of theinner pipe 10. Theinner tube 10 is inserted into thesleeve 20, and thesleeve 20 is sleeved on the outer side of theinner tube 10. A certain gap is formed between thesleeve 20 and theinner tube 10, so that the oblique cutting tube can be conveniently sleeved into theinner tube 10.

Referring to fig. 3, a limiting structure 30 is disposed at an end of the inner tubestraight portion 11. The limiting structure 30 is supported between the outer sidewall of theinner tube 10 and the inner sidewall of thesleeve 20. Moreover, the number of the limiting structures 30 is plural, and the plurality of limiting structures 30 are kept on the same circumference. Specifically, in the present embodiment, there are three limiting structures 30. The relative position of thesleeve 20 and theinner pipe 10 is adjusted to enable the inner pipestraight part 11 to pass through a through hole surrounded by the limiting structures 30. The limiting structure 30 has a limiting effect in the installation process of theinner tube 10 and thesleeve 20, and can ensure the concentricity of theinner tube 10 and thesleeve 20 in the installation process, and ensure the smooth installation of theinner tube 10 and thesleeve 20.

The position limiting structure 30 includes aheat insulation plate 31 and asupport plate 32. Thesupport plate 32 is provided on the inner side wall of thesleeve 20. It will be appreciated that thesupport plate 32 is fixedly welded to the inner side wall of thesleeve 20. Thesupport plate 32 is a stainless steel plate.

One end of theheat insulation plate 31 is connected to thesupport plate 32 by afastener 33. The other end of theheat insulation plate 31 abuts against the outer sidewall of theinner pipe 10. Furthermore, theheat insulation plate 31 is provided with awaist hole 34. The waist holes 34 extend in the radial direction of theinner pipe 10. Thefastener 33 is arranged in thewaist hole 34 in a penetrating way and can slide along thewaist hole 34. The end of theheat insulation plate 31 close to theinner pipe 10 is arc-shaped. The arc shape is matched with the arc shape of the outer wall of theinner pipe 10, so that theheat insulating plate 31 can be completely abutted against theinner pipe 10. It is understood that thefastener 33 may be a bolt and a nut.

In a low-temperature use environment, since thesupport plate 32 is connected with theheat insulation plate 31 by thefastener 33, the displacement deformation caused by the cooling shrinkage of theinner pipe 10 is generated, and thefastener 33 can move along the extending direction of thewaist hole 34 and move towards theinner pipe 10 along the radial direction of theinner pipe 10, thereby adjusting the connecting position of thesupport plate 32 and theheat insulation plate 31. When theinner tube 10 is deformed at low temperature, the secondary stress generated by the low-temperature shrinkage of theinner tube 10 can be released through the waist holes 34. Meanwhile, the gap of the height of theheat insulation plate 31 at least exists between thesleeve 20 and theinner pipe 10, so that the cold insulation in the later period is not influenced. The limiting structure 30 can be stably supported between the first inner pipestraight portion 111 and the first sleevestraight portion 211.

And, a plurality of limit structures 30 are symmetrically distributed along the circumferential direction of the outer sidewall of theinner tube 10. Theheat insulation plates 31 of the respective position restricting structures 30 can be respectively abutted against the outer side walls of theinner pipes 10. Since the plurality of position-limiting structures 30 are symmetrically distributed along the circumference of the outer sidewall of theinner pipe 10, the heat-insulatingplate 31 can also be symmetrically distributed with respect to the outer sidewall of theinner pipe 10. Therefore, theheat insulation plates 31 can be symmetrically distributed on the periphery of theinner pipe 10, theheat insulation plates 31 can stably abut against the outer side wall of theinner pipe 10, the pressure action of theheat insulation plates 31 on theinner pipe 10 is kept balanced, and the phenomenon that theinner pipe 10 is greatly deformed due to cooling to affect the normal use of theinner pipe 10 is avoided.

The gap between thesleeve 20 and theinner pipe 10 may be filled with an insulating layer. The heat preservation layer is used for preserving the heat of the marine natural gas storage tank double-layer pipeline.

Referring to fig. 4, a method for manufacturing a marine natural gas storage tank double-layer pipeline includes the following steps:

in step S11, the straight inner tube passes through the straightfirst sleeve portion 211 of the sleeve, the straightfirst sleeve portion 211 is disposed at the straight firstinner tube portion 111 of theinner tube 10, and the straight secondinner tube portion 112 of the inner tube end is exposed.

The first inner pipestraight portion 111 is located in the middle of the inner pipe. At this time, theinner tube 10 is still a straight tube, and theinner tube 10 can directly penetrate into thesleeve 20, so as to solve the problem of the sleeve of the first sleevestraight part 211 at the middle first inner tubestraight part 111.

The end of the straight portion of inner tube is equipped with a plurality of limit structure 30, and a via hole is enclosed into each other to a plurality of limit structure 30. When the first inner pipestraight portion 111 passes through the first sleevestraight portion 211, the first inner pipestraight portion 111 needs to pass through the through hole.

The end of the first inner pipestraight part 111 is connected with the first sleevestraight part 211 by the limiting structure 30. The limiting structure 30 has a limiting effect during the installation process of theinner tube 10 and thesleeve 20, so as to ensure the concentricity of theinner tube 10 and thesleeve 20.

When the first inner pipestraight portion 111 is cooled and contracted, the limiting structure 30 can be stably supported between the first inner pipestraight portion 111 and the first sleeve pipestraight portion 211. The first inner pipestraight part 111 is prevented from being seriously deformed, and the stable support between theinner pipe 10 and thesleeve 20 is prevented from being influenced.

In step S12, the two ends of the exposedinner tube 10 are bent to form the inner tubebent portion 12 between the first inner tubestraight portion 111 and the second inner tubestraight portion 112.

Theinner tube 10 is bent into an S-shape or other shape according to the design requirements. Specifically, in the present embodiment, there are two inner pipe bentportions 12, which are located at both ends of the first inner pipestraight portion 111. Then, both ends of theinner tube 10 are linear, i.e., two second inner-tubestraight portions 112 are formed.

At this time, the second inner pipestraight portions 112 at the two ends of theinner pipe 10 are exposed, and can be directly bent, thereby facilitating the operation.

In step S13, the second inner pipestraight portion 112 passes through the plurality ofchamfered tubes 221, the chamferedtubes 221 are welded from the end surface of the first sleevestraight portion 211, the plurality ofchamfered tubes 221 are welded to each other to connect the sleevebent portion 22, and the sleevebent portion 22 is fitted to the inner pipebent portion 12.

Thechamfered tube 221 includes a plurality of tubes. The first oblique cutting pipe can be directly sleeved at the end of the first sleevestraight part 211, one end face of the first oblique cutting pipe is welded with the end face of the first sleevestraight part 211, and thewelding seam 23 surrounds the end face of the first sleeve straight part. The second beveled pipe is sleeved on thebent part 12 of the inner pipe and is welded with the end face of the other end of the first beveled pipe, and thewelding seam 23 is also annular.

The inner pipebent portion 12 and the sleevebent portion 22 are both provided. The number of the second inner-tubestraight portions 112 is also two, and a plurality of the chamferedtubes 221 need to be respectively sleeved at the free ends of the two second inner-tubestraight portions 112.

It is understood that, in other embodiments, when the number of thebeveled pipes 221 is small and the radian of the corresponding formed sleevebent portion 22 is small, thebeveled pipes 221 may be welded and spliced to form the sleevebent portion 22, and then the sleevebent portion 22 is sleeved on theinner pipe 10 and welded to the first inner pipestraight portion 111.

In step S14, the second inner pipestraight portion 112 penetrates the second sleevestraight portion 212, and the end surface of the second sleevestraight portion 212 is welded to the end surface of thebeveled pipe 221, so that the second sleevestraight portion 212 is connected to the sleevebent portion 22.

When the end surfaces of the two sleevebent portions 22 are welded to the two ends of the first sleevestraight portion 211, the second sleevestraight portion 212 is inserted into the second inner tubestraight portion 112, and the second sleevestraight portion 212 is welded to the end surface of the other end of the sleevebent portion 22.

Also, the connection between the second innerstraight tube portion 112 and the secondstraight sleeve portion 212 operates similarly to when the first innerstraight tube portion 111 and the firststraight sleeve portion 211 are connected to each other. The end of the second inner pipestraight portion 112 is provided with a plurality of limiting structures 30. When the second inner-tubestraight portion 112 passes through the second-sleevestraight portion 212, the second inner-tubestraight portion 112 needs to pass through the through hole defined by the plurality of limiting structures 30. The end of the second inner pipestraight part 112 is connected with the second sleevestraight part 212 by the limiting structure 30. When the second inner pipestraight portion 112 is cooled and contracted, the limiting structure 30 can be stably supported between the second inner pipestraight portion 112 and the second sleevestraight portion 212.

Specifically, two second casingstraight portions 212 are provided, and the two second casingstraight portions 212 are respectively connected to the two casingbent portions 22 by welding.

In the above natural gas storage tank double-layer pipeline 1 and the manufacturing method thereof, the welding seam of the natural gas storage tank double-layer pipeline 1 is a plurality of annular welding seams which are connected between a plurality ofoblique pipes 221 and connected between theoblique pipes 221 and thestraight part 21 of the sleeve. Compared with the traditional manufacturing method of the double-layer pipeline of the natural gas storage tank, the length of the annular welding line of the double-layer pipeline 1 of the natural gas storage tank is far smaller than that of the axial welding line, and the processing and the manufacturing are convenient. Moreover, thesleeve 20 does not need to be cut into half according to the axial direction of the sleeve, and meanwhile, a large amount of cutting work can be reduced, and the manufacturing is convenient.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims (10)

Translated fromChinese

1.一种船用天然气储罐双层管道，其特征在于，包括内管及套设于所述内管外侧的套管，所述内管设有内管直部及内管弯部，所述套管包括套管直部及套管弯部，所述套管弯部与所述内管弯部对应设置，所述套管直部与所述内管直部对应设置，所述套管弯部包括多个斜切管，多个所述斜切管相互焊接拼接形成套管弯部，两个所述套管直部之间通过所述套管弯部连接。1. a marine natural gas storage tank double-layer pipeline, is characterized in that, comprises inner pipe and the casing that is sleeved on the outside of described inner pipe, and described inner pipe is provided with inner pipe straight part and inner pipe bend part, described The casing includes a casing straight portion and a casing curved portion, the casing curved portion is arranged corresponding to the inner pipe curved portion, the casing straight portion is arranged corresponding to the inner pipe straight portion, and the casing curved portion is arranged correspondingly to the inner pipe straight portion. The sleeve includes a plurality of chamfered pipes, and the plurality of chamfered pipes are welded and spliced to each other to form a sleeve bend, and the two sleeve straight parts are connected by the sleeve bend.2.根据权利要求1所述的船用天然气储罐双层管道，其特征在于，所述斜切管的直径与所述套管直部的直径相等。2 . The double-layer pipeline of a marine natural gas storage tank according to claim 1 , wherein the diameter of the beveled pipe is equal to the diameter of the straight portion of the casing. 3 .3.根据权利要求1所述的船用天然气储罐双层管道，其特征在于，所述内管弯部与套管弯部包括多个。3 . The double-layer pipeline of a marine natural gas storage tank according to claim 1 , wherein the inner pipe bend and the casing bend include a plurality of them. 4 .4.根据权利要求1所述的船用天然气储罐双层管道，其特征在于，所述套管的内径大于所述内管的外径，所述套管与所述内管之间存在间隙。4 . The double-layer pipeline of a marine natural gas storage tank according to claim 1 , wherein the inner diameter of the casing is larger than the outer diameter of the inner pipe, and a gap exists between the casing and the inner pipe. 5 .5.根据权利要求1所述的船用天然气储罐双层管道，其特征在于，所述内管直部的端部设有限位结构，所述限位结构支撑于所述内管的外侧壁与套管的内侧壁之间。5 . The double-layer pipeline of a marine natural gas storage tank according to claim 1 , wherein the end of the straight portion of the inner pipe is provided with a limit structure, and the limit structure is supported on the outer side wall of the inner pipe and the outer wall of the inner pipe. 6 . between the inner walls of the casing.6.根据权利要求5所述的船用天然气储罐双层管道，其特征在于，所述限位结构为多个，多个所述限位结构保持位于同一圆周上，多个所述限位结构相互围成一供所述内管直部穿过的过孔。6 . The double-layered pipeline of a marine natural gas storage tank according to claim 5 , wherein there are multiple limiting structures, and the multiple limiting structures are kept on the same circumference, and the multiple limiting structures are located on the same circumference. A via hole through which the straight part of the inner pipe passes is formed mutually.7.根据权利要求5所述的船用天然气储罐双层管道，其特征在于，所述限位结构包括隔热板及支撑板，所述支撑板设于所述套管的内侧壁上，所述隔热板的一端与所述支撑板通过紧固件连接，所述隔热板的另一端与所述内管的外侧壁相抵接。7 . The double-layer pipeline of marine natural gas storage tank according to claim 5 , wherein the limiting structure comprises a heat insulation plate and a support plate, and the support plate is arranged on the inner side wall of the casing, so that the One end of the heat insulating plate is connected with the support plate by a fastener, and the other end of the heat insulating plate is abutted with the outer side wall of the inner tube.8.一种船用天然气储罐双层管道的制作方法，包括：8. A method for making a double-layer pipeline for a marine natural gas storage tank, comprising:直线型的内管穿过套管的第一套管直部，第一套管直部设于内管的第一内管直部处，内管端部的第二内管直部裸露；弯折裸露的内管，于第一内管直部与第二内管直部之间形成内管弯部；The straight inner tube passes through the straight part of the first sleeve of the sleeve, the straight part of the first sleeve is arranged at the straight part of the first inner tube of the inner tube, and the straight part of the second inner tube at the end of the inner tube is exposed; folding the exposed inner tube to form an inner tube bend between the first inner tube straight part and the second inner tube straight part;第二内管直部穿过多个斜切管，斜切管由第一套管直部的端面开始焊接连接，多个斜切管相互焊接连接形成套管弯部，所述套管弯部与内管弯部的相适配；The straight part of the second inner pipe passes through a plurality of chamfered pipes, the chamfered pipes are welded and connected from the end face of the straight part of the first casing, and the plurality of chamfered pipes are welded and connected to each other to form a casing bend, the casing bend Compatible with the bend of the inner tube;第二内管直部穿过第二套管直部，并将第二套管直部的端面与斜切管的端面焊接连接，使所述第二套管直部与所述套管弯部连接。The second inner tube straight part passes through the second sleeve straight part, and the end face of the second sleeve straight part and the end face of the chamfered tube are welded and connected, so that the second sleeve straight part and the sleeve bent part are connected by welding. connect.9.根据权利要求8所述的船用天然气储罐双层管道的制作方法，其特征在于，所述内管直部的端部设有多个限位结构，多个所述限位结构相互围成一过孔，当内管直部穿过套管直部的时候，所述内管直部需从所述过孔内穿过。9 . The method for manufacturing a double-layer pipeline for a marine natural gas storage tank according to claim 8 , wherein the end of the straight portion of the inner pipe is provided with a plurality of limit structures, and the plurality of limit structures surround each other. 10 . A via hole is formed, and when the straight portion of the inner pipe passes through the straight portion of the sleeve, the straight portion of the inner pipe needs to pass through the via hole.10.根据权利要求8所述的船用天然气储罐双层管道的制作方法，其特征在于，所述第二内管直部、所述内管弯部、套管弯部、所述第二套管直部均为两个，两个所述套管弯部分别依次焊接在所述第一套管直部与两个第二套管直部之间。10. The method for manufacturing a double-layer pipeline for a marine natural gas storage tank according to claim 8, wherein the second inner pipe straight portion, the inner pipe bend portion, the casing bend portion, the second set of There are two straight pipe sections, and the two curved sections of the casing are respectively welded between the first straight section of the casing and the two straight sections of the second casing.

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