Inner and outer pipes fixing support member for gas fuel double pipe and method for installing gas fuel double pipe for gas fuel vessel using the same in assembly ship

Abstract

To provide an inner and outer pipes fixing support member for a gas fuel double pipe that physically and completely fixes an inner pipe and an outer pipe of a gas fuel double pipe for a gas fuel vessel, furthermore, fixes the pipes to a hull member firmly.SOLUTION: An inner and outer pipes fixing support member for a gas fuel double pipe has a disc shape with a prescribed thickness and includes: an inner pipe support part including an inner pipe fitting hole into which an inner pipe of a double pipe is fitted and inserted, in the center thereof; and an outer pipe fitting hole including a joint flange part where an outer pipe of a double pipe is inserted into both sides of the inner pipe support part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a support member for fixing an inner pipe and an outer pipe of a gas fuel double pipe. [Background technology]

[0002] The applicant of the present application has already proposed the disclosure of Japanese Patent No. 7342096 regarding this type of inner and outer pipe fixing support member for a gas fuel double pipe. The disclosure of Patent No. 7342096 relates to an invention titled "Gas-fueled ship double-pipe inner pipe support structure and manufacturing method thereof," and states that "when joining double pipes of a gas-fueled ship, the inner pipe has excellent sliding properties, improving workability, and preventing metal-to-metal contact after joining, making it safe. It does not require a half-sleeve to seal the gap between the outer pipes, and therefore is not affected by deformation when splitting the sleeve in half during sleeve manufacturing or by welding heat during welding, maintaining a true circular cross section, and does not require RT inspection of the welded joints of the half-sleeve cut surfaces." In the problem to be solved by the invention, the publication states, "The object is to provide a gas fuel ship double-pipe inner pipe support structure and a manufacturing method thereof that does not cause a problem of welding the inner pipe of a gas fuel ship double-pipe gas supply of a predetermined length and a method for manufacturing the same" (see paragraph 0009 of the publication specification), "The invention provides an outer pipe that is arranged at a gap required for the work of full penetration butt welding of the inner pipe of the gas fuel ship's gas supply double pipe and non-destructive inspection of the welded portion, a slide sleeve that is long enough to cover the gap and can slide on the outer periphery of the outer pipe, fillet welds between both ends of the slide sleeve and the outer pipe, and a weld between the outer pipe and the inner pipe that is concentric with the outer pipe and the inner pipe near the inner end of the outer pipe. and a Pilaflon U-bolt (Pilaflon is a registered trademark of 0715608) having Pilaflon material (Pilaflon is a registered trademark of 0715608) on its inner circumferential surface that grips the inner pipe on the inner pipe support member (see Claim 1 of the Patent Publication), "(1) Since a half sleeve is not used, it is possible to have a shape with fewer butt welds, which makes it possible to reduce the number of locations where RT inspections required by Part GF of the Rules for Steel Ships are conducted, thereby providing a double-walled inner pipe support structure for gas-fueled ships and a manufacturing method for the same that can reduce on-site work. (2) The outer pipe is shaped like an annular sleeve that slides over and covers it from the outside, so it is not affected by work such as splitting it in half in advance or by the heat of welding when welding the cut surfaces of the halves, and therefore the efficiency of the joining work for the double-walled inner pipe support for gas-fueled ships is significantly improved."(3) In a double pipe where the inner and outer pipes displace and expand differently due to the effects of temperature changes in the fluid flowing inside, the hogging and sagging of the ship's hull, and the acceleration of the ship's motion, the inner and outer pipes can be supported and fixed in a fixed position without following each other's movements. (4) When fixing the outer and inner pipes of a double pipe, the core of the inner pipe can be easily and reliably placed over the core of the outer pipe, and further, when the inner and outer pipes of the double pipe move after installation, there is no metal-to-metal contact, so damage to the inner pipe or sparks caused by wear due to metal contact do not occur (see paragraph 0011 of the specification of the same publication).

[0003] Figures 6(a)(b)(c) are schematic diagrams showing Example 1 for carrying out the double-pipe inner pipe support structure of a gas-fueled ship and the manufacturing method of the same structure according to the disclosed invention attached as Figures 1(a)(b)(c) in the same publication, where Figure 1(a) is a schematic diagram showing the state before the gas fuel pipes are joined, Figure 1(b) is a schematic diagram showing the state when the inner pipe is joined, and Figure 1(c) is a schematic diagram showing the state after the outer pipe is joined, and Figures 7(a)(b) are schematic cross-sectional diagrams of the center of a Pilaflon U-bolt used in the double-pipe inner pipe support structure of a gas-fueled ship and the manufacturing method of the same structure according to Example 2 of the disclosed invention attached as Figures 2(a)(b) in the same publication, and the inner pipe support member.

[0004] In Fig. 6 and Fig. 7, reference numeral 101 denotes a double-pipe inner pipe support structure for a gas fueled vessel according to Example 1 of the disclosed invention, 102 denotes a slide sleeve, 110 denotes an inner pipe support member according to Example 2 of the disclosed invention, 111 denotes a T-shaped support, 112 denotes a SUS height-adjusting shim plate, 113 denotes a PTFE sheet, 114 denotes a Pilaflon U-bolt, 114a denotes a recessed notch, 114b denotes a Pilaflon material, 11 5a and 115b are upper nuts, 116a and 116b are lower nuts, 200 is an inner pipe, 201 is an outer pipe, 203 is a support for the inner pipe, 204, 204a and 204b are half sleeves, and 205 is a welded portion (note that to clarify that the symbols are prior art, the applicant has changed the two-digit symbols to three-digit numbers in the 100s, and the original 100s symbols to three-digit numbers in the 200s).

[0005] FIG. 8 is a diagram showing an outline of the fixing of the inner and outer pipes of a gas fuel double pipe, in which the applicant company installs a flat bar 206 between the inner pipe 200 and the outer pipe 201, which have been conventionally used, and welds and fixes the inner pipe 200 and the outer pipe 201, then welds a sleeve 204 and a plate 207 to the outer pipe 201, and welds the plate 207 to a structural member of the hull (not shown). However, the subsequent revision of the ClassNK Rules for Steel Ships 2023, Chapter 7 of Part GF, states that "high-pressure fuel pipe systems must have sufficient structural strength," and requires stress analysis to be carried out to confirm this, which has raised the risk that the inner and outer pipe fixing support members for gas fuel double pipes that had been used up until now will not be sufficient. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7342096 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, the object of the present invention is to provide a support member for fixing the inner and outer pipes of a gas fuel double pipe, which physically and completely fixes the inner and outer pipes of a gas fuel double pipe of a gas fuel ship, in accordance with the requirements of Chapter 7 of Part GF of the ClassNK 2023 Steel Ship Rules, and which can also firmly fix them to the hull members. [Means for solving the problem]

[0008] In order to solve the above problem, the invention of claim 1 of the present application is an inner / outer pipe fixing support member for a gas fuel double pipe in which an inner pipe through which gas fuel flows is surrounded by an outer pipe through which air flows, and is characterized in that the support member is disk-shaped with a predetermined thickness and has an inner pipe support part with an inner pipe insertion hole in the center into which the inner pipe of the double pipe is inserted, and outer pipe insertion holes on both sides of the inner pipe support part having joining flange parts into which the outer pipe of the double pipe is inserted. The invention according to claim 2 of the present application is characterized in that, in the inner and outer pipe fixing support member for a gas fuel double pipe described in claim 1, the joint between the inner pipe of the inserted double pipe and the inner pipe insertion hole and the joint between the outer pipe of the inserted double pipe and the outer pipe insertion hole have fillet welds around the entire circumference of each pipe. The invention according to claim 3 of the present application is characterized in that, in the inner and outer pipe fixing support member of the gas fuel double pipe described in claim 1, a hull material joining plate that joins the inner and outer pipe fixing support member of the gas fuel double pipe to the hull material is joined to the inner and outer pipe fixing support member of the gas fuel double pipe by fillet welding. Furthermore, the invention of claim 4 of the present application is an inner / outer pipe fixing support member for a double pipe in which an outer pipe through which air flows is concentric with an inner pipe through which gas fuel flows, and is characterized in that the support member has an inner pipe support portion that is disk-shaped with a predetermined thickness and has an inner pipe insertion hole in the center into which the inner pipe of the double pipe is inserted, and outer pipe inner diameter fitting ring portions on both outer edges of the inner pipe support portion that fit externally into protruding annular portions of the inner diameter dimensions of the outer pipe of the double pipe. The invention of claim 5 of the present application is a method for assembling an inner and outer pipe fixing support member for a gas fuel double pipe, characterized by comprising the steps of: inserting an inner pipe of a double pipe of a predetermined length into the inner and outer pipe fixing support member for a gas fuel double pipe described in claims 1 to 4, and fillet welding the joint with the inner pipe around the entire circumference; fitting or fitting the outer pipe of the double pipe from both sides with the inner pipe inserted, and fillet welding the joint with the outer pipe around the entire circumference; and joining the fuel pipe piping joined with the support member and the hull material with a hull material joining plate joined to the support member by fillet welding. [Effects of the Invention]

[0009] (1) The inner and outer pipe fixing support member for a gas fuel double pipe according to the present invention can meet the requirements of Chapter 7 of Part GF of the 2023 Rules for Steel Ships of the Nippon Kaiji Kyokai (ClassNK) by joining the entire circumference of the inner pipe and the outer pipe, which are fitted and joined on both sides, with solid fillet welds, and can completely and firmly fix the inner and outer pipes of a gas fuel double pipe on a gas fuel ship. (2) Furthermore, unlike conventional supports that use flat bars, the inner and outer pipe fixing support members of the gas fuel double pipe according to the present invention do not require any complicated processing when installing the pipes, reducing the number of parts, and facilitating centering of the pipes, which has the advantage of ensuring high manufacturing precision. (3) In addition, by creating a fixing support by cutting out steel material to match the diameter of the inner and outer pipes, it is possible to narrow the space between the inner and outer pipes, and the shape makes it easy to center the piping, which greatly improves workability.

[0010] (4) Furthermore, since the flange shape protrudes from the outer pipe, a wide flange can be formed at the joint with the outer pipe, and the hull joining plate can be directly welded, which reduces the number of parts. (5) Furthermore, in the case of a double-pipe support member using a conventional flat bar as shown in Figure 8, space is required for welding between the inner and outer pipes to secure the flat bar, making it difficult to make the outer pipe smaller. In addition, centering the inner and outer pipes is difficult when assembling the double pipe, making assembly time-consuming and requiring a large number of parts. However, by using the inner and outer pipe fixing support member for gas fuel double pipes according to the present invention, double pipes are essential for cryogenic piping such as that using gas fuel. In manufacturing, the adoption of the inner and outer pipe fixing support member for gas fuel double pipes according to the present invention, which does not have the conventional complex shape, can improve work efficiency and contribute to cost reduction. [Brief explanation of the drawings]

[0011] [Figure 1] 1(A) and 1(B) are detailed views showing a first embodiment of a support member for fixing inner and outer pipes of a gas fuel double pipe for implementing the support member for fixing inner and outer pipes of a gas fuel double pipe according to the present invention, in which FIG. 1(A) is a front view of the support member for fixing inner and outer pipes of a gas fuel double pipe according to the first embodiment, and FIG. 1(B) is a side cross-sectional view of the same. [Figure 2]FIG. 2 is a detailed joining diagram showing the state in which the inner pipe and outer pipe of the gas fuel double pipe are fitted into the inner / outer pipe fixing support member 1 of the double pipe according to the present embodiment 1, and the inner pipe and outer pipe of the double pipe are joined by fillet welding. [Figure 3] 3(a)(b)(c)(d)(e) are schematic diagrams showing the assembly procedure for gas fuel double pipe piping of a gas fuel ship or the like using the inner / outer pipe fixing support member 1 for the gas fuel double pipe according to this embodiment 1. [Figure 4] FIG. 4 is a diagram showing an example of the fixed arrangement of the gas fuel double pipes arranged in the ship in this manner. [Figure 5] 5(A) and 5(B) are diagrams showing an outline of an inner and outer pipe fixing support member of a gas fuel double pipe according to Example 2 of the present invention, FIG. 5(A) is a front view of the inner and outer pipe fixing support member of a gas fuel double pipe according to Example 2 and is a diagram corresponding to FIG. 1(A), and FIG. 5(B) is a detailed joining diagram showing the state in which the inner pipe and outer pipe of the double pipe are fitted into the inner and outer pipe fixing support member of the gas fuel double pipe according to Example 2 and joined to the inner pipe and outer pipe of the double pipe by fillet welding and is a diagram corresponding to FIG. 2. [Figure 6] Figures 6(a)(b)(c) are schematic diagrams showing Example 1 for carrying out the gas fuel ship double-pipe inner pipe support structure and manufacturing method of the same structure according to the disclosed invention attached as Figures 1(a)(b)(c) in Japanese Patent Publication No. 7342096, where Figure 1(a) is a schematic diagram showing the state before joining of the gas fuel pipes, Figure 1(b) is a schematic diagram showing the state when the inner pipe is joined, and Figure 1(c) is a schematic diagram showing the state after joining of the outer pipe. [Figure 7] Figures 7(a) and 7(b) are schematic cross-sectional views of the central part of a Pilaflon U-bolt used in a double-pipe inner pipe support structure for a gas-fueled ship and a method for manufacturing the same, according to Example 2 of the disclosed invention, which are attached as Figures 2(a) and 2(b) in Japanese Patent Publication No. 7342096. [Figure 8]FIG. 8 shows an outline of the fixing of the inner and outer pipes of a gas fuel double pipe, in which the applicant company installs a flat bar 206 between the inner pipe 200 and the outer pipe 201, which have been conventionally used, and welds and fixes the inner pipe 200 and the outer pipe 201, then welds a sleeve 204 and a plate 207 to the outer pipe 201, and welds the plate 207 to a structural member of the hull (not shown). DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the inner and outer pipe fixing support member for a gas fuel double pipe according to the present invention will be described in detail with reference to the drawings. [Example]

[0013] 1(A) and 1(B) are detailed views showing a first embodiment of a support member for fixing inner and outer pipes of a gas fuel double pipe for implementing the support member for fixing inner and outer pipes of a gas fuel double pipe according to the present invention, in which FIG. 1(A) is a front view of the support member for fixing inner and outer pipes of a gas fuel double pipe according to the first embodiment, and FIG. 1(B) is a side cross-sectional view of the same. In Figures 1(A) and (B), reference numeral 1 denotes an inner / outer pipe fixing support member of a gas fuel double pipe according to the first embodiment, 2 denotes an outer pipe insertion hole, 3 denotes an inner pipe insertion hole, 4 denotes a joint flange portion, 5 denotes an inner pipe support portion, and 6a to 6d denote hollow portions. As is clear from Figures 1(A) and (B), the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to this embodiment 1 is a disk-shaped member having a predetermined thickness overall, with the joint flange 4 as the outer diameter, an inner pipe insertion hole 3 at the center, an outer pipe insertion hole 2 on the center side of the joint flange 4, and a cross-shaped inner pipe support portion 5, with four hollow portions 6a to 6d between each of the cross-shaped inner pipe support portions 5.

[0014] The material of the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to Example 1 is manufactured by cutting a rolled steel material that matches the pipe material of the inner and outer pipes into a predetermined shape. Specifically, for example, the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to Example 1 is manufactured by cutting a 20 mm thick SUS316L into the shape shown in Figures 1(A) and (B). In addition, depending on the specifications of the double pipe to be used, it may be compatible with, for example, a double pipe with an outer pipe outer diameter of 116 mm and an inner pipe outer diameter of 61.1 mm or 49.1 mm, or a double pipe specification with an outer pipe outer diameter of 142 mm and an inner pipe outer diameter of 34.5 mm.

[0015] FIG. 2 is a detailed joining diagram showing the state in which the inner pipe and outer pipe of the gas fuel double pipe are fitted into the inner / outer pipe fixing support member 1 of the double pipe according to the present embodiment 1, and the inner pipe and outer pipe of the double pipe are joined by fillet welding. In FIG. 2, 8 denotes an outer pipe of the gas fuel double pipe joined to the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to the first embodiment, 9 denotes the inner pipe, 10 denotes a hull material joining plate for joining the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to the first embodiment to a hull material, 11a to 11d denote outer pipe fillet welds between the joining flange 4 of the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to the first embodiment and the outer pipe 8, 12a to 12d denote inner pipe fillet welds between the inner pipe insertion hole 3 of the inner pipe support part 5 and the inner pipe 9, and 13a and 13b denote plate fillet welds for joining the hull material joining plate 10 to the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to the first embodiment.

[0016] As shown in Figure 2, an inner pipe 9 is inserted into the inner pipe insertion hole 3 of the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to this embodiment 1, which has been machined into the shape of Figures 1(A) and (B), and fillet welding is performed around the entire circumference to form inner pipe fillet welds 12a to 12d. Thereafter, the outer pipe 8 is abutted against the joint flange portion 4 of the outer pipe insertion hole 2 from both sides of the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to this embodiment 1, and the connecting portion is fillet welded to form outer pipe fillet welds 11a to 11d, thereby fixing the inner pipe 9 and outer pipe 8 of the double pipe. As shown in Figure 2, the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to this embodiment 1 can comply with the requirements of Chapter 7 of Part GF of the ClassNK 2023 Steel Ship Rules by joining the inner pipe 9 and the outer pipe 8 of the double pipe, which are fitted together, using solid fillet welding, and can completely and firmly fix the inner pipe and outer pipe of the gas fuel double pipe of a gas fuel ship.

[0017] (Assembling method) Next, the procedure for assembling a double fuel pipe for a gas fuel ship or the like using the inner / outer pipe fixing support member 1 for a gas fuel double pipe according to the first embodiment will be described with reference to the drawings. 3(a), (b), (c), (d), and (e) are schematic diagrams showing the procedure for assembling a gas fuel double pipe piping for a gas fuel ship or the like using the inner / outer pipe fixing support member 1 for a gas fuel double pipe according to this embodiment 1. In Fig. 3(a), (b), (c), and (d), reference numeral 15 denotes a hull material that fixes the fuel pipe inside the hull, and the remaining reference numerals indicate the same members as those shown in Fig. 1 and Fig. 2.

[0018] 3(a), (b), (c), and (d), first, an inner pipe 9 of an appropriate length constituting the double pipe of the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to the first embodiment is inserted into the inner pipe insertion hole 3 (FIG. 3(a)). Then, with the inner pipe 9 inserted, the inner pipe insertion hole 2 of the inner pipe support portion 5 of the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to the first embodiment and the inner pipe 9 are welded by fillet welding over the entire circumference of the inner pipe 9 to form inner pipe fillet welds 12a to 12d (not shown in FIG. 3).

[0019] Next, with the inner pipe 9 fillet welded to the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to this embodiment 1, the outer pipes 8, 8 are inserted into the outer pipe insertion holes 2 from both sides of the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to this embodiment 1 (FIG. 3(b)), and the joining flange portion 4 and the outer pipes 8, 8 are welded by fillet welding around the entire circumference of the outer pipes 8, 8 to form outer pipe fillet welds 11a to 11d (not shown in FIG. 3).

[0020] Next, the support member 1 for fixing the inner and outer pipes of the gas fuel double pipe according to this embodiment 1 is placed near the hull material 15 to be piped (Fig. 3(c)), and the hull material 15 and the support member 1 for fixing the inner and outer pipes of the gas fuel double pipe according to this embodiment 1 are joined with a hull material joining plate 10 (Fig. 3(d)). Note that in order to position the support member 1 at the hull material 15 position inside the ship, the length of each pipe 8, 9 etc. is determined in advance based on design drawings etc., and when installing on site, any error is adjusted between the hull material 15 and the hull material joining plate 10.

[0021] FIG. 4 is a diagram showing an example of the fixed arrangement of the gas fuel double pipes arranged in the ship in this manner. The inner and outer pipe fixing support member 1 of the gas fuel double pipe according to this embodiment 1, assembled as shown in Figure 4, can be joined to the inner pipe 9 and outer pipe 8 of the double pipe, which are fitted together, by a solid fillet weld, and can comply with the requirements of Chapter 7 of Part GF of the 2023 Rules for Steel Ships of the Japan Maritime Association (Nihon Kaiji Kyokai), and can physically and firmly fix the inner pipe and outer pipe of the gas fuel double pipe of a gas fuel ship, resulting in additional effects such as a reduction in the number of parts, easier pipe centering, improved manufacturing precision, improved work efficiency, and cost reduction.

[0022] Furthermore, based on the requirements of Chapter 7 of the 2023 Steel Ship Rules, Part GF, of the Nippon Kaiji Kyokai (ClassNK), a general incorporated foundation, we conducted a stress analysis of the piping at key points along the piping route where the hull and the inner and outer pipes are completely fixed together, and confirmed that the results met the above requirements. [Example]

[0023] Next, a second embodiment for implementing the inner and outer pipe fixing support member of a gas fuel double pipe according to the present invention will be described. Figures 5(A) and (B) are diagrams showing an outline of an inner and outer pipe fixing support member of a gas fuel double pipe according to Example 2 of the present invention, and Figure 5(A) is a front view of the inner and outer pipe fixing support member of a gas fuel double pipe according to Example 2, and is a diagram corresponding to Figure 1(A). Also, Figure 5(B) is a detailed joining diagram showing a state in which the inner pipe and outer pipe of the double pipe are fitted into the inner and outer pipe fixing support member of the gas fuel double pipe according to Example 2 and joined to each other by fillet welding, and is a diagram corresponding to Figure 2.

[0024] In Figures 5(A) and (B), reference numeral 20 denotes an inner and outer pipe fixing support member for a gas fuel double pipe according to Example 2, 21 denotes an inner pipe insertion hole of the double pipe, 22 denotes an inner diameter fitting ring portion of the outer pipe, 23 denotes an inner pipe support portion, 24a to 24d denote hollow portions, 25 denotes a hull joining plate, and reference numerals 8 and 9 denote the outer pipe and inner pipe of the double pipe, which are the same as those in Figures 1(A) and (B), using the same reference numerals.

[0025] As is clear from Figures 5(A) and (B), the inner and outer pipe fixing support member 20 of the gas fuel double pipe according to this embodiment 2 is the same as the inner and outer pipe fixing support member 1 of the gas fuel double pipe according to the above-mentioned embodiment 1 in that it has an inner pipe insertion hole 3 and is joined to the inner pipe and outer pipe by fillet welding. However, the inner and outer pipe fixing support member 20 of the gas fuel double pipe according to this embodiment 2 does not have a joining flange portion 4. In other words, the outer edges on both sides of a predetermined thickness of the inner and outer pipe fixing support member 20 of the gas fuel double pipe according to this embodiment 2 are annularly cut away to the inner diameter dimensions of the outer pipe to form outer pipe inner diameter fitting ring portions 22, and the outer pipe inner diameter fitting ring portion 22 is externally fitted onto the inner diameter of the outer pipe 8, which is a major difference.

[0026] As a result, the inner / outer pipe fixing support member 20 of the gas fuel double pipe according to this embodiment 2 does not have the joint flange portion 4 that the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to embodiment 1 has, and the outer pipe 8 is fitted at a right angle into the outer pipe inner diameter fitting ring portion 22 and joined at a right angle by fillet welding. As is clear from Figure 5(B), the inner pipe 9 and outer pipe 8 of the double pipe that are joined in the inner / outer pipe fixing support member 20 of the gas fuel double pipe according to this embodiment 2 are firmly fixed by fillet welding around the entire joint circumference, so as with the inner / outer pipe fixing support member 1 of the gas fuel double pipe according to embodiment 1, by joining the inner pipe 9 and outer pipe 8 of the double pipe that are fitted or fitted together by solid fillet welding, it is possible to comply with the requirements of Chapter 7 of Part GF of the 2023 Steel Ship Rules of the Nippon Kaiji Kyokai (ClassNK), a general incorporated foundation, and it is possible to completely and firmly physically fix the inner pipe and outer pipe of the gas fuel double pipe of a gas fuel ship.

[0027] Other effects of the invention of the inner and outer pipe fixing support member 1 for the gas fuel double pipe according to Example 1 are also the same, such as easy centering, reduced number of parts, guaranteed manufacturing accuracy, improved workability, smaller diameter of the double pipe, and cost reduction. [Industrial Applicability]

[0028] The present invention is used for a support member for fixing the inner and outer pipes of a gas fuel double pipe. [Explanation of symbols]

[0029] 1. Inner and outer pipe fixing support member of gas fuel double pipe according to embodiment 1 2 Outer pipe insertion hole 3 Inner pipe insertion hole 4 Joint flange 5 Inner pipe support part 6a~6d Hollow part 8 outer tube 9 Inner tube 10 Hull material bonding plate 11a~11d Outer pipe fillet welds 12a~12d Inner pipe fillet weld 15 Hull material 20 Inner and outer pipe fixing support member of gas fuel double pipe according to Example 2 21 Inner pipe insertion hole 22 Outer tube inner diameter fitting ring 23 Inner pipe support part 24a~24d Hollow part 25 hull joint plate 101 Gas fuel ship double pipe inner pipe support structure according to embodiment 1 of the disclosed invention 102 Slide Sleeve 110 Inner pipe support member according to Example 2 of the disclosed invention 111 T-type support 112 SUS height adjustment shim plate 113 PTFE Sheet 114 Pilaflon U-Bolt 114a concave notch 114b Pilaflon material 115a, 115b upper nuts 116a, 116b Lower nuts 200 inner tube 201 Outer tube 203 Inner pipe support 204, 204a, 204b Half sleeve 205 Welded parts 206 Flat Bar 207 Plate

Claims

1. An inner and outer pipe fixing support member for a gas fuel double pipe in which an inner pipe through which gas fuel flows is surrounded by an outer pipe through which air flows, The support member has a disk shape of a predetermined thickness and an inner pipe support portion having an inner pipe insertion hole at the center into which the inner pipe of the double pipe is inserted; An inner and outer pipe fixing support member for a gas fuel double pipe, comprising: an inner pipe support portion, on both sides of which an outer pipe insertion hole has a joining flange portion into which the outer pipe of the double pipe is inserted;

2. The inner and outer pipe fixing support member for a gas fuel double pipe as described in claim 1, characterized in that the joint between the inner pipe of the inserted double pipe and the inner pipe insertion hole and the joint between the outer pipe of the inserted double pipe and the outer pipe insertion hole have fillet welds around the entire circumference.

3. The inner and outer pipe fixing support member for a gas fuel double pipe according to claim 1, characterized in that the hull material joining plate that joins the inner and outer pipe fixing support member for the gas fuel double pipe to the hull material is joined to the inner and outer pipe fixing support member for the gas fuel double pipe by fillet welding.

4. An inner and outer pipe fixing support member for a double pipe having a concentric structure in which an inner pipe through which gas fuel flows and an outer pipe through which air flows, The support member has a disk shape of a predetermined thickness and an inner pipe support portion having an inner pipe insertion hole at the center into which the inner pipe of the double pipe is inserted; outer pipe inner diameter fitting ring portions, on both outer edges of the inner pipe support portion, into which the outer pipe is fitted externally in projecting annular portions having the same inner diameter dimension as the outer pipe of the double pipe; 1. A support member for fixing an inner pipe and an outer pipe of a gas fuel double pipe, comprising:

5. a step of inserting an inner pipe of a predetermined length of the double pipe into the inner / outer pipe fixing support member of the gas fuel double pipe according to any one of claims 1 to 4, and fillet welding the joint between the inner pipe and the double pipe over the entire circumference; a step of fitting or engaging the outer pipe of the double-walled pipe from both sides with the inner pipe inserted, and fillet welding the joint between the outer pipe and the inner pipe over the entire circumference; and joining the fuel pipe piping joined by the support member and the hull material with a hull material joining plate joined to the support member by fillet welding.

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