JPH10213513A - Cylindrical pressure test piece structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent crack generation or the like during a pressure test so as to surely and efficiently perform the pressure test by setting the plate thickness of each of both end parts of a cylindrical pressure test piece with flange members to which welding is executed thicker than that of a middle cylindrical part. SOLUTION: Both ends of a cylindrical pressure test piece 10 with flange members 2 and 2 to which welding is executed are formed to be thick parts 10a thicker than the plate thickness of a middle cylindrical part 10b to be tested. A slope 10c is formed in the boundary of each thick end part 10a and the middle cylindrical part 10b. The annular protruding part 2a of each flange member 2 and the outer periphery of each thick end part 10a of the pressure test piece 10 are welded and fixed to each other, and the inner surface of the flange part 2 and the tip part of the pressure test piece 10 are also welded and fixed to each other. Thus, no heat influence is given to the middle cylindrical part 10b during welding, welding is facilitated and no defects occur. Moreover, even if the deformation of the pressure test piece 10 progresses because of pressure testing, no sharp bending like that in the conventional case occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical pressure-resistant test piece structure suitable for use in a pressure test of a short cylindrical container such as a nuclear power container (for example, material SUS).

[0002]

2. Description of the Related Art When a pressure test of a short cylindrical container such as a nuclear container (for example, material SUS) is performed, for example, FIG.
The cylindrical container 1 shown in FIG. 1 is used as a cylindrical pressure-resistant test piece. FIG. 4 is a sectional view showing a pressure test state in which the upper and lower portions of the cylindrical container 1 are closed by flange members 2 and 2, and FIG. 5 is an enlarged sectional view showing a portion V in FIG.

As shown in FIG. 4, conventional cylindrical pressure-resistant test pieces (cylindrical containers) 1 are all formed with the same plate thickness.
Each flange member 2 capable of closing both ends of the cylindrical container 1 is formed with an annular protruding portion (insertion portion) 2a into which the ends 1a of the cylindrical container 1 are inserted on the inner peripheral side. As shown in FIGS. 4 and 5, the ends 1a, 1a of the cylindrical container 1 are connected to the flange members 2, 2, respectively.
Are inserted inside the annular projections 2a, 2a of
A doubling 3, 3 is provided on the inner periphery of the ends 1a, 1a of the cylindrical container 1.
And each end 1 a of the cylindrical container 1 is
a and the doubling 3, and in such a state, each protruding portion 2 a and each end 1 a of the cylindrical container 1 are welded by a welding portion 4, and each doubling 3 and each of the cylindrical container 1 are welded. The ends 1a are welded by the welds 5 and the doublings 3 and the inner surfaces of the flange members 2 are welded by the welds 6 to the ends 1a and 1a of the cylindrical container 1, respectively. 2 is fixed.

An opening 2b is formed in the upper flange member 2 in FIG. 4, and a fluid is supplied to the inside of the cylindrical container 1 through the opening 2b during a pressure resistance test.
As a result, fluid pressure is applied to the cylindrical container 1 sealed by the flange members 2, 2, and a strength test such as deformation or breakage of the intermediate cylindrical portion (test target portion) of the cylindrical container 1 is performed. ing.

As described above, the conventional test piece (cylindrical container) 1
In the structure (1), the end portions 1a, 1a and the intermediate cylindrical portion are cylindrical bodies having the same thickness, and the end portions 1a, 1a are thin, so that they cannot be welded to the flange members 2, 2 as they are. ,
The doubling 3, 3 is used for the purpose of mounting reinforcement.

[0006]

However, in the above-described conventional cylindrical pressure-resistant test piece structure, the ends 1a, 1a of the cylindrical container 1 are made to have the same plate thickness (thin plate thickness) as the intermediate cylindrical portion (test target portion). ), The end 1
The a and 1a are directly affected by the heat during welding, the strength is reduced, and a crack may be generated from a welded joint other than the test target.

FIGS. 6 and 7 show a situation in which a load is applied to the inside of the cylindrical container 1 during the pressure resistance test, and the deformation of the intermediate cylindrical portion has progressed. FIG. 6 is a cross-sectional view showing a state of the cylindrical container 1 in which the deformation has progressed, and FIG. 7 is a cross-sectional view showing an enlarged part VII of FIG. As shown in FIGS. 6 and 7, as the deformation of the intermediate cylindrical portion of the cylindrical container 1 progresses, the portions affected by the heat by the welds 4 and 5 (portions denoted by reference numeral 1b in FIG. 7) have an acute angle. There is a problem that a substantial bending occurs, a crack is generated from this portion 1b, and a pressure test can not be performed on a portion (intermediate cylindrical portion) to be actually tested.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and prevents cracks and the like from being generated during a pressure test at a welded portion to a flange member, thereby reliably performing a pressure test on a test target portion. An object of the present invention is to provide a cylindrical pressure-resistant test piece structure that can be efficiently performed.

[0009]

To achieve the above object, a cylindrical pressure-resistant test piece structure according to the present invention (Claim 1) is characterized in that a pressure-resistant test is carried out in a state in which flange members that respectively close the openings at both ends are attached by welding. The structure of the cylindrical pressure-resistant test piece to be subjected to the, the plate thickness of both ends of the cylindrical pressure-resistant test piece to be welded to the flange member, the intermediate cylindrical portion of the cylindrical pressure-resistant test piece is the test target portion Characterized in that it is formed to be thicker than the plate thickness.

At this time, an inclined surface may be formed so as to gradually reduce the thickness from both ends of the cylindrical pressure-resistant test piece toward the intermediate cylindrical portion of the cylindrical pressure-resistant test piece (claim 2). A beveled portion used for welding to the flange member may be formed at both ends of the test piece.

[0011]

Embodiments of the present invention will be described below with reference to the drawings (FIGS. 1 to 3). 1 to 3 show a structure of a cylindrical pressure-resistant test piece as an embodiment of the present invention. FIG. 1 is a cross-sectional view showing a state of a pressure-resistant test of a cylindrical pressure-resistant test piece (cylindrical container) for explaining the structure. FIG. 2 is FIG.
FIG. 3 is an enlarged cross-sectional view showing a part II of FIG. 2, and FIG. 3 is a cross-sectional view corresponding to FIG. 2 of a cylindrical pressure-resistant test piece (cylindrical container) of the present embodiment in a state where deformation has progressed by a pressure resistance test. .

The cylindrical pressure-resistant test piece (cylindrical container) 10 of the present embodiment is also subjected to a pressure-resistant test in a state where the flange members 2 and 2 for closing the openings at both ends are attached by welding, similarly to the conventional one. However, in the present embodiment,
As shown in FIG. 1 and FIG. 2, both ends (joint portions with the flange members 2, 2) of the cylindrical pressure-resistant test piece 10 to be welded to the flange members 2, 2 are cylindrical portions which are test portions. The pressure end portion 10 having a thickness greater than the thickness of the intermediate cylindrical portion (cylindrical general portion, test portion) 10b of the pressure-resistant test piece 10
a and 10a.

The boundary between the thick end portion 10a, which is a thick plate, and the intermediate cylindrical portion 10b, which is a thin plate (on the inner peripheral side of the pressure-resistant test piece 10), extends from the thick end portion 10a to the intermediate cylindrical portion 10b.
An inclined surface 10c is formed so as to gradually reduce the plate thickness toward. Furthermore, the inner surface of both ends of the cylindrical pressure-resistant test piece 10 is used for welding the inner surface of the flange member 2 (the surface on the inner peripheral side with respect to the annular protrusion 2a) and the tip end of the cylindrical pressure-resistant test piece 10. Beveled portions 10d are formed respectively.

The above-mentioned thick end portion 10a and inclined surface 10c may be machined at the time of production of the cylindrical pressure-resistant test piece 10 or may be changed in thickness during production of the cylindrical pressure-resistant test piece 10 (rolling). At time) by changing the thickness. On the other hand, also in the present embodiment, the thick ends 10a, 10a of the pressure-resistant test piece 10 are inserted into the inner peripheral side of each flange member 2, which can close both ends of the cylindrical pressure-resistant test piece 10, as in the related art. An annular protruding portion (insertion portion) 2a is formed to protrude.

The thick end portion 10 of the pressure test piece 10
a, 10a are inserted into the annular projections 2a, 2a of the flange members 2, 2, respectively, and the annular projection 2a of each flange member 2 and each thick end 1 of the pressure-resistant test piece 10 are inserted.
0a is welded to the outer periphery by a welded portion 4 and the inner surface of the flange member 2 (a surface closer to the inner periphery than the annular projecting portion 2a).
And the tip of the pressure-resistant test piece 10 are welded by a weld 7,
Flange members 2 and 2 are fixed to thick ends 10a and 10a of pressure-resistant test piece 10, respectively.

Also in this embodiment, an opening 2b is formed in the upper flange member 2 in FIG. 1, and during a pressure test, fluid flows inside the cylindrical pressure-resistant test piece 10 through the opening 2b. Supplied. This allows
Fluid pressure is applied to the pressure-resistant test piece 10 sealed by the flange members 2, 2 so that a strength test such as deformation or breakage of the intermediate cylindrical portion (test target portion) 10 b of the pressure-resistant test piece 10 is performed. Has become.

In the cylindrical pressure-resistant test piece 10 as one embodiment of the present invention, as described above, each flange member 2
Each end of the test piece 10 joined by welding is formed as a thick end 10a that is thicker than the thickness of the intermediate cylindrical portion 10b, so that welding is performed to attach each flange member 2 to the test piece 10. Even if this is performed, the intermediate cylindrical portion (cylindrical general portion, test target portion) 10b is not affected by heat, and there is no shortage of strength due to the thermal effect. Further, since the thickness of the portion to be welded (thick end portion 10a) is thicker, welding to the flange member 2 becomes easier and defects are less likely to occur as compared with the conventional structure.

Further, since the inclined surface 10c is formed at the boundary between the thick end portion 10a which is a thick plate and the intermediate cylindrical portion 10b which is a thin plate, the deformation of the pressure test piece 10 is performed by a pressure test as shown in FIG. Does not occur as in the prior art (see reference numeral 1b in FIG. 7), the vicinity of the welded joint of the pressure-resistant test piece 10 is smoothly deformed as indicated by the arrow A, and stress concentration occurs. Nothing.

Therefore, according to the cylindrical pressure-resistant test piece structure as one embodiment of the present invention, it is possible to reliably prevent cracks and the like from being generated during the pressure-resistant test at the welding portion to the flange member 2. Intermediate cylindrical part 10b to be tested
Can be reliably and efficiently performed. Further, in the present embodiment, since the welded portion of the pressure-resistant test piece 10 to the flange member 2 is formed as a thick end portion 10a thicker than the intermediate cylindrical portion 10b, sufficient strength is obtained when the flange member 2 is attached. However, in the present embodiment, the conventional doubling 3 (see FIGS. 4 to 7) does not require reinforcement.

Further, in this embodiment, the inner surface of each flange member 2 and the front end of the pressure-resistant test piece 10 are welded to each other by using the groove 10d at the inner periphery of both ends of the cylindrical pressure-resistant test piece 10. It is welded and sufficient penetration can be obtained. Therefore, in the conventional test piece 1, the upper and lower ends 1
a, three welded portions 4 to 6 were formed in a circumferential shape (see FIG. 4), but in the test piece 10 of this embodiment, two welded portions were formed at the upper and lower thick ends 10a. Even if the doubling 3 is not provided, the mounting strength equal to or higher than that of the related art can be secured only by forming the doubling 3.

[0021]

As described above in detail, according to the cylindrical pressure-resistant test piece structure of the present invention, the end of the test piece connected to each flange member by welding is thicker than the plate thickness of the intermediate cylindrical portion. Due to the extremely simple configuration of being formed as an end, even if welding is performed to attach a flange member to the end of the test piece, the intermediate cylindrical portion is not affected by heat, and there is no shortage of strength due to heat. . Therefore, it is possible to reliably prevent a crack or the like from being generated during the pressure test at the welded portion to the flange member, and it is possible to reliably and efficiently perform the pressure test of the intermediate cylindrical portion which is the test target portion. 1).

Further, by forming an inclined surface at the boundary between the thick end portion, which is a thick plate, and the intermediate cylindrical portion, which is a thin plate, the vicinity of the welded joint of the pressure-resistant test piece is smooth even if the deformation progresses in the pressure-resistant test. , And stress concentration does not occur, so that cracks and the like can be more reliably prevented from occurring during the pressure test, and the pressure test of the intermediate cylindrical portion, which is the test target portion, can be performed more reliably and efficiently. There is an effect (claim 2).

Further, by forming a groove for welding a flange member at both ends of a cylindrical pressure-resistant test piece, sufficient penetration can be obtained, so that doubling is not provided and the number is smaller than in the conventional case. With the number of welding operations, there is also an effect that the same or higher mounting strength can be secured as in the conventional case (claim 3).

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state of a pressure resistance test of a cylindrical pressure resistance test piece (cylindrical container) for explaining a cylindrical pressure resistance test piece structure as one embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a portion II in FIG. 1;

3 is a cross-sectional view corresponding to FIG. 2, showing a cylindrical pressure-resistant test piece (cylindrical container) of the present embodiment in a state where deformation has progressed by a pressure-resistant test.

FIG. 4 is a cross-sectional view showing a pressure test state of a conventional cylindrical pressure test piece (cylindrical container).

FIG. 5 is an enlarged sectional view showing a portion V in FIG. 4;

FIG. 6 is a cross-sectional view showing a conventional cylindrical pressure-resistant test piece (cylindrical container) in a state where deformation has progressed by a pressure-resistant test.

FIG. 7 is an enlarged sectional view showing a VII part in FIG. 6;

[Explanation of symbols]

 2 Flange member 2a Annular protruding part (insertion part) 4, 7 Welded part 10 Cylindrical pressure test piece (cylindrical vessel) 10a Thick end 10b Intermediate cylindrical part (test target part) 10c Inclined surface 10d

Claims (3)

[Claims] 1. A structure of a cylindrical pressure-resistant test piece to be subjected to a pressure-resistant test in a state where flange members respectively closing both end openings are welded, and wherein said cylindrical pressure-resistant test piece is welded to said flange member. A cylindrical pressure-resistant test piece structure, wherein the plate thickness at both ends of the test piece is formed larger than the plate thickness of an intermediate cylindrical portion of the cylindrical pressure-resistant test piece, which is a test object part. 2. An inclined surface such that a plate thickness is gradually reduced from both end portions of the cylindrical pressure-resistant test piece toward an intermediate cylindrical portion of the cylindrical pressure-resistant test piece. 2. The cylindrical pressure test specimen structure according to 1. 3. The cylindrical pressure-resistant test piece is provided at both ends thereof with a groove for welding to the flange member. The described cylindrical pressure-resistant test piece structure.