KR20220135471A - Pressure container manufacturing method for maintaining roundness of cylinder for pressure container and support structure therefor - Google Patents

Abstract

According to the present invention, provided is a pressure container manufacturing method for maintaining roundness of a cylinder for a pressure container, which comprises: a step of inserting a cylinder into a circular hold of a guide ring; a step of forming a cylinder block by fixating the guide ring to the cylinder at a predetermined interval along an outer circumference of the guide ring while the cylinder is spaced to the inside of the guide ring in a radial direction by a plurality of fixing members to enable the guide ring to provide support force for restraining deformation of the cylinder to the cylinder; a step of preparing the plurality of cylinder blocks to assemble the cylinder blocks; and a step of removing the guide ring from the cylinder in the outside.

Description

A method for manufacturing a pressure vessel that maintains the roundness of a cylinder for a pressure vessel, and a supporting structure therefor

The present invention relates to a method for manufacturing a pressure vessel for maintaining the roundness of a cylinder for a pressure vessel and a cylinder support structure therefor. More specifically, it relates to a method for manufacturing a pressure vessel capable of maintaining the roundness of a cylinder for a pressure vessel until manufacturing of the pressure vessel is completed using a high-strength structure, and to a support structure for maintaining the roundness of a cylinder for a pressure vessel.

In the field of pressure vessels, particularly storage tanks for cryogenic and high-pressure gas, roundness below a predetermined value may be required for their function. For example, as described in FIG. 1 , the roundness is a value obtained by dividing the difference between the maximum inner diameter inside the container and the minimum inner diameter inside the container in a plane perpendicular to the axis of the container by the reference inner diameter ((maximum inner diameter - minimum inner diameter)/standard inner diameter), and in the case of a storage tank for high-pressure gas, this roundness may be limited to not exceed 1% in any cross section.

The high-pressure gas storage tank may be manufactured by assembling a plurality of cylinders, and a high-strength structure such as a jig is installed inside the cylinder to maintain the roundness of the cylinders while the individual cylinders are manufactured and transported. FIG. 2 shows a cylinder 2 in which a jig 1 for maintaining the roundness of the conventional cylinder is installed.

The structure installed inside the cylinder remains without being removed from the cylinder to maintain the roundness of the cylinder until the cylinders are assembled and the overall shape of the tank is completed. The operation of removing them one by one and taking them out of the tank is being performed.

This work method currently being carried out involves the risk of workers having to work in an enclosed space inside the tank where there is a high risk of suffocation and explosion, and the difficulty of the work is also very high, so it is inefficient in terms of time and cost. .

KR 10-1455515 B1 (2014. 10. 21.)

An object of the present invention is to provide a method for manufacturing a pressure vessel capable of maintaining the roundness of a cylinder until the pressure vessel is safely and easily completed by an operator, and a supporting structure therefor.

Another object of the present invention is to provide a method for manufacturing a pressure vessel that can be applied to cylinders of various sizes by repeatedly using the same guide ring and a supporting structure therefor.

Another object of the present invention is to provide a method for manufacturing a pressure vessel capable of minimizing the risk of welding defects when welding a plurality of cylinders to each other, and a supporting structure therefor.

The problems to be solved of the present invention are not limited to the above-mentioned contents, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to one embodiment of the present invention, there is provided a pressure vessel manufacturing method for maintaining the roundness of a cylinder for a pressure vessel, the method comprising: inserting the cylinder into a circular hole of a guide ring; The guide ring is fixed to the cylinder at predetermined intervals along the outer periphery of the guide ring in a state in which the cylinder is spaced radially inward of the guide ring by a plurality of fixing members so that the guide ring provides a supporting force to the cylinder to suppress the deformation of the cylinder. to form a cylinder block; providing a plurality of the cylinder blocks and assembling them; externally removing the guide ring from the cylinder.

In addition, the step of forming the cylinder block may include the step of integrally coupling the fixing member with the guide ring and the cylinder by welding.

In addition, the fixing member includes a lug and a plate disposed between the lug and the cylinder, the lug is formed of a material different from the cylinder, the plate is formed of the same material as the cylinder, and the plate is integrally coupled to the cylinder by welding can be

Also, the rug may be made of carbon.

In addition, the lug includes a first extension extending in a longitudinal direction to be secured to the guide ring, and a second extension extending in a radial direction to be fixed to the cylinder with the cylinder spaced apart in a radially inward direction of the guide ring, A plate may be disposed between the second extension and at least a portion of the cylinder.

In addition, a flange for contacting the guide ring may be provided on a lower surface of the first extension. The flange is formed as a separate plate member by being welded to the lower surface of the first extension, and at least one unevenness may be formed on the lower surface of the first extension around a portion where the flange is welded to the lower surface of the first extension.

In addition, the step of inserting the cylinder into the circular hole of the guide ring includes the steps of: disposing a spacer in a leveled platen; disposing a guide ring over the spacer; disposing the cylinder within the circular hole of the guide ring.

In addition, the step of removing the guide ring from the cylinder from the outside may include grinding and removing the connection weld formed between the fixing member and the cylinder.

In addition, according to an embodiment of the present invention, as a cylinder support structure for maintaining the roundness of the cylinder for a pressure vessel, a guide ring forming a circular hole for inserting the cylinder, and the guide ring for suppressing deformation of the cylinder a plurality of fixing members for fixing the guide ring to the cylinder at predetermined intervals along an outer periphery of the guide ring in a state in which the cylinder is spaced radially inwardly of the guide ring to provide a supporting force to the cylinder, the fixing member including the guide ring and a lug for coupling with and a plate disposed between the lug and the cylinder, wherein the lug is a member separate from the guide ring and is formed of a material different from that of the guide ring and the cylinder, and the plate may be formed of the same material as the cylinder have.

In addition, the guide ring is composed of at least two guide ring pieces, and the joint line formed on the outer circumferential surface of the guide ring by coupling between the guide ring pieces is not a straight line in the longitudinal direction of the guide ring. For example, the joint line may be a zigzag line.

According to an embodiment of the present invention, since the cylinders are assembled in an exoskeleton method of installing a guide ring that can prevent the deformation of the circular structure of the cylinder on the outside of the cylinder to complete the pressure vessel, the operator is safe from outside the completed pressure vessel and the guide ring can be easily removed, and the time and cost required for manufacturing the pressure vessel can be reduced. In addition, unlike the prior art, since there is no complicated support structure inside the pressure vessel, it becomes much easier to install a sloshing rib or an internal pipe in the pressure vessel.

In addition, according to an embodiment of the present invention, since the same guide ring can be repeatedly used and applied to cylinders of various sizes, the cost for maintaining the power level of the cylinder can be reduced, resulting in the production of pressure vessels cost can be reduced.

In addition, according to an embodiment of the present invention, since the joint line formed on the outer circumferential surface of the guide ring is not formed in a straight line in the longitudinal direction of the guide ring, rattling that may occur as the joint line passes over the turning roller is minimized. Therefore, the risk of C-seam welding failure can be reduced.

Effects of the present invention are not limited to the above-mentioned contents, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a view showing a maximum inner diameter and a minimum inner diameter of a cross section of a container to explain roundness.
2 is a perspective view of a cylinder having a jig installed therein for maintaining the roundness of the conventional cylinder.
3 is an exemplary diagram of a pressure vessel manufacturing system according to an embodiment of the present invention.
4 is a perspective view of a guide ring according to an embodiment of the present invention.
5 is a perspective view of a cylinder in a state in which one guide ring piece is installed in the cylinder through a fixing member according to an embodiment of the present invention.
FIG. 6 is an enlarged view of a circled portion of FIG. 5 .
FIG. 7 is a view viewed from the direction A of FIG. 6 .
8 is a perspective view of a fixing member according to an embodiment of the present invention.
9 is a process flowchart of a method for manufacturing a pressure vessel according to an embodiment of the present invention.
10 is a perspective view of a leveling plate according to an embodiment of the present invention.
11 is a perspective view of a cylinder block according to an embodiment of the present invention.
12 is an explanatory view illustrating a procedure for welding a plurality of lugs to a guide ring according to an embodiment of the present invention.
13 is a perspective view showing a state in which the cylinder block is mounted on the turning roller through a crane according to an embodiment of the present invention.
14 is a perspective view of a guide ring piece according to another embodiment of the present invention.
15 shows a cylinder block to which the guide ring piece shown in FIG. 14 is applied.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase.

As used herein, “comprises”, “comprising” refers to the presence or absence of one or more other components, steps, operations and/or elements mentioned. addition is not excluded.

In addition, terms including ordinal numbers such as first, second, etc. used in the present invention may be used to describe the components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another. In addition, in the description of the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the effects thereof will be clearly understood through the following detailed description.

3 is an exemplary diagram of a pressure vessel manufacturing system according to an embodiment of the present invention.

Referring to FIG. 3 , the pressure vessel manufacturing system according to an embodiment of the present invention (instead of the method of attaching a structure to the inside of the cylinder when manufacturing an individual cylinder as in the prior art) is a cylinder 100 on the outside of the cylinder 100 . It provides an exoskeleton method for installing the guide ring 200 that can prevent the deformation of the circular structure. To this end, the pressure vessel manufacturing system may include the cylinder 100 , the turning roller 400 , and the crane 500 in which the guide ring 200 is installed through the fixing member 300 .

4 is a perspective view of a guide ring 200 according to an embodiment of the present invention. 5 is a perspective view of a cylinder in a state in which the guide ring piece, which is one piece of the guide ring 200 according to an embodiment of the present invention, is installed in the cylinder 100 through the fixing member 300 . FIG. 6 is an enlarged view of a circled portion of FIG. 5 . FIG. 7 is a view viewed from the direction A of FIG. 6 . 4 to 6 , the guide ring 200 is a support structure for providing support to the cylinder 100 to maintain the roundness of the individual cylinder 100 . The guide ring 200 may be manufactured as one piece, or may be manufactured as two or more pieces. The guide ring 200 includes a circular hole 220 into which the cylinder 100 is inserted. When the cylinder 100 is inserted into the hole 220 of the guide ring 200, the guide ring so that the cylinder 100 can be spaced apart by a predetermined distance (d) in the radial direction inside (R) of the guide ring (200) The inner diameter of 200 is designed to be larger than the outer diameter of the cylinder 100 . The guide ring 200 may be manufactured in a high-strength H-beam structure so as to provide a strong supporting force to the cylinder 100 .

The fixing member 300 fixes the guide ring 200 to the cylinder 100 so that the guide ring 200 provides a supporting force for suppressing the deformation of the cylinder 100 to the cylinder 100 . More specifically, the fixing member 300 may include a lug 320 and a plate 340 disposed between the lug 320 and the cylinder 100 .

7 and 8 , the lug 320 includes a first extension 322 extending in the longitudinal direction L of the guide ring 200 and the cylinder 100 so as to be fixed to the guide ring 200 . includes a second extension portion 324 extending radially inward (R) of the guide ring 200 so as to be fixed to the cylinder 100 in a state spaced apart from the radially inward (R) of the guide ring 200 . . A flange 326 for contacting at least a portion of the guide ring 200 is provided on a lower surface of the first extension 322 . The plate 340 is disposed between the lower surface of the second extension 324 and the cylinder 100 . Also, as an alternative, instead of the flange 326 , a plate (of the same shape as the flange) as a member separate from the lug 320 may be attached to the lower surface of the first extension 322 by welding.

As will be described later, as the lug 320 is reused, the flange may be deformed or damaged by repeated welding and grinding. Accordingly, it may be desirable to use a plate as a separate member instead of the flange 326 . In this case, the plate as a separate member may be welded to the lower surface of the first extension 322 of the lug 320 using a carbon welding rod. In addition, as the plate is welded to the first extension 322 of the lug 320 , irregularities 328 may be formed on the lower surface of the first extension 322 to minimize deformation of the lug around the welded portion.

The lower surface of the plate 340 is first welded to the cylinder 100 by the first welding, and then the upper surface of the plate 340 is welded to the lower surface of the second extension 324 of the lug 320 by the second welding. do. The lower surface of the flange 326 is attached to the guide ring 200 by third welding.

The guide ring 200 is designed so that the inner diameter of the guide ring 200 is larger than the outer diameter of the cylinder 100 so that it can be applied to the cylinders 100 having an outer diameter of a predetermined range. Therefore, the lug 320 is manufactured as a separate member from the guide ring 200 so that the lug 320 of a different size can be applied according to the outer diameter of the cylinder to be assembled while repeatedly using the same guide ring 200 . It is attached to the ring 200 by welding.

The pressure vessel may be a storage tank for cryogenic high-pressure gas, in which case the cylinder 100 may be, for example, a high-manganese steel containing 9% Ni. When the plate 340 is welded to the cylinder 100 , the plate 340 may be formed of the same material as the material of the cylinder 100 in order to prevent defects from occurring due to mixing of the base material of the cylinder due to dissimilar welding. have. The first welding is performed using a welding rod suitable for the material of the cylinder 100 .

As described above, the lug 320 is manufactured as a member separate from the guide ring 200 , and thus may be formed of a material different from that of the guide ring 200 . Since the lug 320 may be deformed or damaged through a welding or grinding process, etc., it may be difficult to reuse for a long time unlike the guide ring 200 , and thus may be made of low-cost carbon. In this case, the second welding and the third welding are performed using a carbon electrode.

Alternatively, the lug 320 may be made of the same material as the cylinder 100 . When the lug 320 is made of carbon (as will be described later), the flange 326 and the guide ring 200 of the lug 320 are welded, and then the guide ring 200 is removed from the cylinder 100. When this weld is ground, this is because, when a carbon lug is used, carbon fine particles are scattered around and buried in the cylinder 100 during grinding. If necessary, several welding processes may be added to the outside of the pressure vessel, and carbon fine particles existing outside the pressure vessel may be mixed with the base material during the welding process.

As described above, the guide ring 200 is fixed to the cylinder 100 through the fixing member 300 to form a cylinder block. As used herein, the cylinder block refers to an assembly of the guide ring and the cylinder formed by fixing the guide ring to the cylinder.

9 is a process flowchart of a method for manufacturing a pressure vessel according to an embodiment of the present invention. Hereinafter, a method of manufacturing a pressure vessel according to an embodiment of the present invention will be described in detail with reference to FIG. 9 .

In the method for manufacturing a pressure vessel according to an embodiment of the present invention, the step of inserting the cylinder 100 into the circular hole 220 of the guide ring 200 ( S1 ), and the guide ring 200 is the cylinder 100 . The guide ring 200 in a state in which the cylinder 100 is spaced apart from the inside (R) in the radial direction of the guide ring 200 by a plurality of fixing members 300 to provide a supporting force for suppressing the deformation to the cylinder 100 . ) forming a cylinder block by fixing the guide ring 200 to the cylinder 100 at predetermined intervals along the outer periphery (S2), and assembling them by providing a plurality of the cylinder blocks (S3); and removing the guide ring 200 from the cylinder 100 in (S4).

In step S1, for example, a leveled surface plate 600 as shown in FIG. 10 may be used. That is, since the width of the guide ring 200 is smaller than the width of the cylinder 100, the guide ring 200 is spaced apart from the bottom of the surface plate 600 on the surface plate 600 maintained horizontally (not shown). The space is first placed in the surface plate 600 . Thereafter, the cylinder 100 is placed in the circular hole 220 of the guide ring 200 after placing the guide ring 200 on the spacer.

In step S2 , the lug 320 and the plate 340 are welded to the cylinder 100 and the guide ring 200 . By such welding, the guide ring 200 is attached to the cylinder 100 at predetermined intervals along the outer periphery of the guide ring 200 in a state in which the cylinder 100 is spaced apart from the radially inner side (R) of the guide ring 200 . is fixed The welding sequence may be as shown in FIG. 12 . Since a predetermined tensile force is generated between the guide ring 200 and the cylinder 100 at the welding site by welding, welding is performed in the order shown in FIG. This is done. Through this, as shown in FIG. 11, a cylinder block is formed.

In step S3, the cylinder block formed in step S2 is assembled. More specifically, as shown in FIG. 13 , a cylinder block is placed on a pre-installed turning roller 400 via a crane 500 . The cylinder blocks are continuously assembled by rotating the turning roller 400 and welding the C-seam between the cylinder blocks. Finally, the end plate (not shown) is welded in the same manner as above to complete the overall tank shape.

In step S4, the guide ring 200 is removed from the cylinder 100 from the outside. More specifically, the weld formed between the plate 340 and the cylinder 100 and the weld formed between the flange 326 and the guide ring 200 of the lug 320 are removed by grinding and removing the guide ring 200 into the cylinder. It is removed from (100). In some cases, not all the guide rings 200 are removed one after another from the front of the tank, but only the guide rings installed in some cylinder blocks (eg, guide rings installed in the cylinder block for tank manhole work) are removed. In consideration of the need, the guide ring 200 may be formed of a plurality of pieces. For example, the guide ring may be composed of two pieces, which may be assembled through common fasteners. When the guide ring 200 is composed of a plurality of pieces, the removal process first releases the coupling between the guide ring pieces, and then grinds and removes the weld formed between the plate 340 and the cylinder 100 to remove the guide ring piece. remove them in turn.

14 is a perspective view of one guide ring 800 piece according to another embodiment of the present invention. 15 shows a cylinder block to which the guide ring piece shown in FIG. 14 is applied. When the guide ring pieces are coupled to form the guide ring 800 , a joint line 820 is formed on the outer circumferential surface of the guide ring 800 inevitably by coupling between the guide ring pieces. When the cylinder block is placed on the turning roller 400, the turning roller 400 is rotated, and the C-seam between the cylinder blocks is welded, the joint line 820 passes over the turning roller 400 and the rattling occurs. can occur As shown in FIGS. 14 and 15 (unlike the guide ring 200 shown in FIG. 6 ), the end of the guide ring piece is formed so as not to be formed in a straight line in the longitudinal direction L of the guide ring 800 . can Therefore, the above rattling is minimized, and thus the risk of C-seam welding failure is reduced. More preferably, as shown in FIG. 14 , the joint line 820 may be formed in a zigzag pattern.

Above, the pressure vessel manufacturing method for maintaining the roundness of the cylinder for pressure vessel according to the embodiment of the present invention and the supporting structure therefor have been described as various specific embodiments, but this is only an example, and the present invention is not limited thereto, It should be construed as having the widest scope according to the basic idea disclosed herein. A person skilled in the art may implement a pattern of a shape not specified by combining or substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

100: cylinder
200: guide ring
300: fixing member
320: rug
340: plate
400: turning roller
500: crane

Claims (15)

A method for manufacturing a pressure vessel for maintaining the roundness of a cylinder for a pressure vessel, the method comprising:
inserting the cylinder into the circular hole of the guide ring;
The guide ring is attached to the cylinder at predetermined intervals along the outer periphery of the guide ring in a state in which the cylinder is spaced radially inward of the guide ring by a plurality of fixing members so that the guide ring provides a supporting force to the cylinder to suppress the deformation of the cylinder. fixing to form a cylinder block;
providing a plurality of cylinder blocks and assembling them;
and removing the guide ring from the cylinder externally.
The pressure vessel manufacturing method according to claim 1, wherein the step of forming the cylinder block includes the step of integrally coupling the fixing member with the guide ring and the cylinder by welding.
3. The method of claim 2, wherein the fixing member comprises a lug and a plate disposed between the lug and the cylinder;
The lug is formed of a material different from that of the cylinder, and the plate is formed of the same material as the cylinder,
wherein the plate is integrally coupled to the cylinder by welding;
A method of manufacturing a pressure vessel.
4. The method of claim 3, wherein the lugs are made of carbon.
4. The radial direction of claim 3, wherein the lug includes a first extension extending in a longitudinal direction of the guide ring so as to be fixed to the guide ring, and a radial direction of the guide ring so that the cylinder is fixed to the cylinder in a state in which the cylinder is spaced apart radially inward of the guide ring. a second extension extending inwardly;
wherein the plate is disposed between the second extension and at least a portion of the cylinder.
A method of manufacturing a pressure vessel.
According to claim 5, The lower surface of the first extension is provided with a flange for contacting the guide ring,
A method of manufacturing a pressure vessel.
The method of claim 1, wherein inserting the cylinder into the circular hole of the guide ring comprises:
placing a spacer in a leveled platen;
placing a guide ring over the spacer;
A method of manufacturing a pressure vessel comprising the step of placing a cylinder within a circular hole of a guide ring.
3. The method of claim 2, wherein the step of removing the guide ring from the cylinder from the outside includes grinding and removing a connecting weld formed between the fixing member and the cylinder.
A cylinder support structure for maintaining the roundness of a cylinder for a pressure vessel, comprising:
A guide ring forming a circular hole for inserting the cylinder;
A plurality of fixings for fixing the guide ring to the cylinder at predetermined intervals along the outer periphery of the guide ring in a state in which the cylinder is spaced radially inwardly of the guide ring so that the guide ring provides a supporting force for suppressing the deformation of the cylinder to the cylinder including absence,
The fixing member includes a lug for engaging the guide ring, and a plate disposed between the lug and the cylinder,
The lug is a member separate from the guide ring and is formed of a material different from that of the guide ring and the cylinder, and the plate is formed of the same material as the cylinder,
cylinder support structure.
10. The cylinder support structure of claim 9, wherein the lugs are made of carbon.
10. The radial direction of claim 9, wherein the lug includes a first extension extending in a longitudinal direction of the guide ring to be fixed to the guide ring, and a radial direction of the guide ring so that the cylinder is fixed to the cylinder in a state in which the cylinder is spaced radially inward of the guide ring. comprising a second extension extending inwardly;
cylinder support structure.
The method of claim 11, wherein a flange for contacting the guide ring is provided on a lower surface of the first extension,
cylinder support structure.
According to claim 12, wherein the flange is a separate plate member is formed by welding to a lower surface of the first extension, the lower surface of the first extension, the flange is at least one around a portion welded to the lower surface of the first extension of irregularities are formed,
cylinder support structure.
The cylinder support according to claim 9, wherein the guide ring is composed of at least two guide ring pieces, and a joint line formed on an outer circumferential surface of the guide ring by coupling between the guide ring pieces is not a straight line in the longitudinal direction of the guide ring. structure.
15. The cylinder support structure of claim 14, wherein the joint line is a zigzag line.

Images