JP2000162105A - Pressure test device for cylindrical structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening part closing device for cylindrical structure pressure test repeatedly usable by use of the pressure in the test for the fixation of a device used for closing an opening part in pressure test. SOLUTION: A cylindrical structure opening part closing jig 28 as this device is formed of a disc-like closing plate 3 for preventing the outflow of an internal fluid and a body 21 having a structure for transmitting the pressure of the internal fluid in a pressure test to a support leg part 22. Since welding is not used for the fixation of the jig 28, the influence on a base material in the attachment and detachment can be avoided. Further, since this jig is repeatedly usable, the material cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure test device for closing an opening when a pressure test of a cylindrical structure is performed.

[0002]

2. Description of the Related Art In general, it is often legally required to conduct a pressure test in order to confirm the soundness of a cylindrical structure such as a heat exchanger such as a feed water heater or a drain tank, or a pipe. In particular, in a power plant, the operating pressure at the time of operation is high, and the welded portion of a cylindrical structure having a high degree of importance may be a welding inspection target site, and will undergo a witness inspection during a pressure test. . Therefore, the welded portion must be in a state where the appearance inspection can be performed at the time of the pressure resistance test, and therefore, the welded portion must be exposed to the front.

[0003] A conventional closing plate used in the pressure test has a structure shown in FIG. This is a method in which a cap-type closing plate 32 is put on a cylindrical structure 31 and attached by fillet welding 33. However, there is a risk that the closing cap may be affected by thermal stress or the like due to welding at the time of mounting, and may damage the base material due to the use of a grinder when removing the cap. In addition, since the fixing cap is fixed by welding, the work efficiency at the time of attachment and detachment has been raised as a problem. Further, since the closing cap cannot be used repeatedly, economical aspects have also been regarded as a problem.

In view of the above situation, Japanese Patent Laid-Open Publication No.
According to JP-A-219284, reaction force receiving ribs are fixed to a plurality of locations on the side of the nozzle by welding, and a closing plate is placed on the groove of the nozzle via packing, and the closing plate and the ring are fastened with bolts and nuts. There has been proposed a pressure-resistant test closing device characterized by fastening and fixing, but this also has the above-mentioned problems because welding is used for mounting the rib.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to use an internal pressure during a test as a fixing force of a closing plate and use welding. An object of the present invention is to propose a pressure-resistant test closing device for a cylindrical structure, which can easily fix and easily attach and detach a closing plate without using the same.

Another object of the present invention is to provide a device which can be used as a pressure-resistant closing jig for a cylindrical structure having a similar diameter only by replacing a closing plate with the aim of further improving work efficiency, and can be used repeatedly at the same time. An object of the present invention is to provide a pressure-resistant test closing device for a cylindrical structure which can greatly reduce the cost of a pressure-resistant jig or the like.

[0007]

According to the present invention, there is provided a jig for a pressure test of a cylindrical structure according to the present invention, which includes a closing plate for preventing an outflow of an internal fluid, and is connected to the closing plate to directly transmit the internal pressure to a supporting leg. By having the structure, a pressing force in a radial direction of the cylindrical structure is obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of a jig for a pressure resistance test of a cylindrical structure according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory sectional view showing the structure of a jig for a pressure resistance test of a cylindrical structure, FIG. 2 is a front view of the jig, and FIG.
Is a side view of the jig. As shown in FIG. 1, a jig 28 for cylindrical structure pressure test is inserted into the inside of the cylindrical structure 1, and a closing plate 3 for preventing an internal fluid from flowing out at the time of the pressure test,
It comprises a support leg 22 for converting the internal pressure in the radial direction of the cylindrical structure 1.

The closing plate 3 is a disk-shaped structure having a hole in the center and has a diameter substantially equal to the inner diameter of the cylindrical structure 1, but by making the diameter slightly smaller, 1 can be inserted. The closing plate 3 is connected to the closing auxiliary plate 7 by a fastening bolt 11. Similar to the closing plate 3, the closing auxiliary plate 7 has a disc-like shape with a hole at the center, and the surface of the hole has a surface for connection with the jig body 27 for a pressure resistance test of a cylindrical structure. Screws are cut. A sealing packing 5 is provided in the circumferential direction of the closing auxiliary plate 7.

Since the surface to which the sealing gasket 5 is connected is tapered, the structure is such that it is pushed out in the radial direction by tightening the tightening bolt 11. A ring-shaped packing 9 is fitted between the closing plate 3 and the closing auxiliary plate 7 in order to prevent internal fluid from entering.

A jig body 27 for a cylindrical structure withstand pressure test includes:
It is in a hollow state to allow the internal fluid to penetrate, and the outer periphery of the tip is partially a male screw portion 13 for use in connecting the closing plate body 2. The packing 15 is fixed to the receiving surface 17 of the closing plate main body 2 so that the internal fluid does not flow out of the apparatus when the closing plate main body 2 is connected to the jig body 27 for the pressure resistance test of the cylindrical structure. ing.

The supporting leg 22 has a structure in which the supporting leg 21 is directly connected to a piston 19 incorporated in a jig body 27 for a pressure resistance test of a cylindrical structure. The piston 19 has a structure for preventing the internal fluid from flowing out by an O-ring 25.

The opposite side of the connecting portion of the piston 19 of the supporting leg 21 serves as a stopper 23. The internal pressure during the test is transmitted to the supporting leg 21 to generate a frictional force with the inner surface 30 of the cylindrical structure. It plays a role of preventing movement of the jig 28 for the pressure resistance test of the cylindrical structure. In addition, by providing the support leg 21 with a certain length, the jig body 2 for the same cylindrical structure pressure test can be obtained.
7 is a jig that can be used regardless of the diameter of the cylindrical structure on which the pressure test is performed.

A description will be given of a procedure in the case of using the jig 28 for the pressure resistance test of the cylindrical structure having the above-described structure at the time of the pressure resistance test of the cylindrical structure.

The main body 2 of the closing plate is inserted from the opening 29 of the cylindrical structure 1 to be subjected to the pressure test so that the closing plate 3 is a surface directly receiving the internal pressure. At this time tightening bolt 1
By loosening 1, a slight gap is created between the inner surface 30 of the cylindrical structure and the cylindrical structure can be easily mounted. After inserting the closing plate body 2 and determining the position,
By tightening the tightening bolts 11, the sealing packing 5 is removed.
Is crushed by the closing plate 3 and the closing auxiliary plate 7,
It has a shape that is in close contact with the inner surface 30 of the cylindrical structure. Thereafter, the jig body 27 for cylindrical structure pressure resistance test is inserted and joined with the closing plate main body 2 and the male screw portion 13. At this time, since the support leg 22 is not subjected to internal pressure, it can be easily inserted into the cylindrical structure 1.

After the cylindrical structure pressure test jig 28 is installed in the cylindrical structure 1 as described above, a fluid is introduced from the opposite side of the opening of the cylindrical structure 1 to allow the cylindrical structure 1
To increase the internal pressure.

FIG. 5 shows a state diagram of the jig 28 for the pressure test of the cylindrical structure when the inside of the cylindrical structure 1 is pressurized. As shown in the drawing, the inside of the cylindrical structure 1 is pressurized during the pressure test, and the pressure is transmitted to the piston 19 of the support leg 22 to push the support leg 21 in the radial direction.
By the pressing action, the cylindrical structure pressure test jig 28 is fixed to the cylindrical structure inner surface 30. At the same time, the internal pressure is such that the cylindrical structure pressure test jig 1 is pushed into the opening 29, but as the internal pressure increases, the support legs 2 are pushed.
The pressing force transmitted to 1 also increases, and it is possible to prevent the jig 28 for cylindrical structure pressure test from moving.

At the time of removal after the pressure test, the internal pressure of the cylindrical structure 1 becomes low, so that the pressing force transmitted to the support leg 21 becomes the atmospheric pressure. Jig for pressure test of cylindrical structure 2
8 can be removed.

[0020]

As described above, according to the present invention, a cylinder constituted by a main body for generating a pressing force by directly utilizing the pressure of an internal fluid during a pressure test and a closing plate for preventing the internal fluid from flowing out. A jig for a cylindrical structure withstand pressure test, which can be easily mounted without using welding by a jig for withstand structure test and can be used repeatedly many times, can be provided. In addition, by providing the support legs with a certain length, it is possible to use them as a closing jig that does not depend on the diameter by simply changing the closing plate, thereby improving workability and achieving a significant reduction in material costs. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the structure of a jig for a pressure resistance test of a cylindrical structure according to the present embodiment.

FIG. 2 is a front view of the jig of FIG.

FIG. 3 is a side view of the jig of FIG. 1;

FIG. 4 is a cross-sectional view showing a state of a jig for a pressure resistance test of a cylindrical structure when the inside of the cylindrical structure is pressurized.

FIG. 5 is a cross-sectional view showing a conventional cylindrical structure pressure test jig and a state during a pressure test.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical structure, 2 ... Closing plate main body, 3 ... Closing plate, 5 ...
Sealing packing, 7: Closing auxiliary plate, 9: Ring packing, 11: Tightening bolt, 13: Male screw part, 15: Packing, 17: Receiving surface, 19: Piston, 21: Support leg,
22: support leg, 23: stopper, 25: O-ring, 2
7 ... Jig body for cylindrical structure pressure test, 28 ... Jig for cylindrical structure pressure test, 29 ... Opening, 30 ... Inside surface of cylindrical structure.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Junji Sumikawa 3-1-1, Sakaimachi, Hitachi-shi, Ibaraki F-term in Hitachi, Ltd. Hitachi Plant F-term (reference) 2G061 AA02 CB09 3H025 DA02 DB12 DC02 DD01

Claims (2)

[Claims] 1. A closing plate for preventing an internal fluid from flowing out of a cylindrical structure, and a member for generating a pressing force in a radial direction in the cylindrical structure by using an internal fluid pressure during a pressure resistance test. An apparatus for a pressure test of a cylindrical structure, characterized by comprising: 2. A structure which can be used for a pressure test of a cylindrical structure having a similar diameter only by replacing a closing plate by forming the shape of the extruding member to be transmitted to a supporting leg having a certain length. The apparatus for a pressure test of a cylindrical structure according to claim 1.