JPH03249546A - Material inspecting device for structure body for handling fluid - Google Patents

Abstract

PURPOSE:To execute the inspection of a state of corrosion and wear without stopping an operation by installing a test piece on the closed face of a valve body for closing an opening part of a structure body and taking out the test piece by turning the valve body at the time of inspection. CONSTITUTION:A valve body 8 for closing part 2 of a structure body 1 for handling a fluid is formed by an anticorrosion metal and on its inside face, a T-shaped test piece 19 consisting of the same material as that of the structure body 1 is installed, and accordingly, the piece 19 is exposed in the fluid. In such a state, at the time of inspection, the valve body 8 is turned by 180 degrees by a stem 12, the piece 19 is moved to a blind patch 5 side of a body cap 6, the test piece 19 is taken out by removing the blind patch 5, and a state of corrosion, wear, etc., is inspected. In such a way, corrosion, wear, etc., of material of the structure body can be inspected without exerting influence on an operation of a plant equipment, etc., and the operation cost and the maintenance cost can be reduced.

Description

[Detailed description of the invention]

[0001]

[Industrial application field]

The present invention deals with corrosion of structural materials such as equipment and pipes such as reaction vessels and pressure vessels that handle fluids such as gases, liquids, and slurries in plant equipment for oil refining, petrochemicals, fine chemicals, city gas, nuclear power, etc. , [0002] relating to a device for inspecting conditions such as wear, etc.

[Conventional technology]

Conventionally, corrosion of structural materials such as reaction vessels, pressure vessels, and other equipment that handle fluids such as gases, liquids, and slurries, and piping in this type of plant equipment has occurred.
When inspecting conditions such as wear (erosion), the following operations are required. For example, wear inspection can be carried out by temporarily stopping the operation of plant equipment, opening the flanges of equipment and piping, etc., and visually inspecting the inside, or measuring the wall thickness of the equipment body walls and piping, etc. to detect defects. Check if there is. [0003] Corrosion inspection also involves temporarily stopping the operation of plant equipment,
Flanges of equipment, piping, etc. are opened, and test pieces are taken in and out to check the condition of the test pieces. [0004]

[Problem to be solved by the invention]

However, with such conventional inspection methods, as mentioned above, it is necessary to temporarily stop the operation of plant equipment and open equipment, piping, etc. It could not be done arbitrarily. For this reason, there is a problem in that the operating rate of plant equipment decreases, resulting in economic losses such as large operating costs and maintenance costs. [0005] By the way, the present applicant previously provided a spherical member with a part of its surface facing an opening formed in the wall of a structure that handles fluid such as equipment or piping, and this spherical member was kept open at all times. By rotating the part with the spherical member closed, the fluid inside the structure does not leak to the outside through the opening, and the state of corrosion, wear, etc. of the part to be inspected provided on at least a part of the surface of the spherical member can be checked. We have proposed an inspection device that inspects the state of corrosion, wear, etc. of the material of the structure.

[0006] In this case, as a result of using a spherical member that constantly closes the opening as a member for providing the inspection target portion, the fluid inside the structure may leak to the outside when the spherical member is rotated when performing an inspection. However, unlike the valve body of a ball valve, it is necessary to specially manufacture a special device such as a spherical member without a through hole or, in some cases, a hollow member to have this inside, which increases manufacturing costs. Bulk. [0007] The present invention has been made in view of the above-mentioned conventional problems, and it is possible to inspect the state of corrosion, wear, etc. of the material of the structure without affecting the operation of plant equipment, etc. Moreover, it is an object of the present invention to provide an inspection device that can be easily manufactured by using existing equipment rather than a dedicated device, and which can keep manufacturing costs low. [00Q8] [Means for Solving the Problems] Therefore, the material inspection device for a structure that handles fluid according to the present invention is connected to an opening formed in a wall of a structure that handles fluid outside the structure. A valve body is provided with a hollow member and opens and closes the inside of the hollow member by rotating inside the hollow member, and the surface facing the inside of the structure in a state where the hollow member is closed is made of the same material as the structure wall. A valve body provided with a portion to be inspected is rotatably supported inside a hollow member, and a position where the surface of the valve body provided with the portion to be inspected faces the inside of the structure and a position provided in the hollow member that can be freely opened and closed is provided. An external operating means for rotating the valve body is provided at a position facing the window. [0009] In the above configuration, the valve body is rotated by the external operating means so that the surface on which the inspection target portion is provided faces the inside of the structure. Thereby, the inspection target portion is exposed to the fluid under the same conditions as the structure wall. When the inspection period is reached, rotate the valve body so that the surface on which the inspection target part is provided faces a window provided in the hollow member that can be opened and closed freely, and inspect the corrosion and corrosion of the inspection target part through the window. Inspect conditions such as wear. [0010] When the valve body is rotated, the inside of the hollow member is temporarily opened so that the fluid inside the structure flows into the hollow member, but the window portion of the hollow member is normally closed. has been
In addition, when the window of a hollow member is opened for inspection, the valve body closes the hollow member, so a large amount of the fluid is not discharged to the outside, and the structure is maintained without affecting the operation of the plant equipment. It can inspect the state of body materials such as corrosion and wear.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, for example, an opening 2 is provided in a part of a wall IA of a container 1 as a wall of a structure handling fluid. A hollow member 3 connected to the opening 2 outside the container 1 is provided. [0012] The hollow member 3 includes a cylindrical body 4 having an open end fixedly attached to the outer end of the opening 2 of the container wall IA, and a cylindrical body 4 having an open end connected to the other end of the body 4. The body cap 6 is made up of a cylindrical body cap 6 whose other end is opened and closed as a window portion by a blind plate 5, and a seal member 9 fixed to the inner circumferential surface of the body 4. [0013] The outer end of the opening 2 and the body 4 are connected to the container wall IA.
A flange portion 1 fixed to the outer end of the opening 2 by welding etc.
This is done by fastening the flange portion 4a integrally formed on the outer periphery of the open end portion of the body 4 with bolts and nuts (not shown). The body 4 and the body cap 6 are connected by bolts (not shown) between a flange 4a integrally formed on the outer layer of the open end of the body 4 and a flange 6a formed on the outer periphery of the open end of the body cap 6.・This is done by tightening the nut. Furthermore, the body cap 6 and the blind plate 5 are connected by a flange 6a formed on the outer layer of the open end of the body cap 6.
This is done by fastening the and peripheral end portion 5a of the blind plate 5 with bolts and nuts (not shown). [0014] Note that a seal is provided on the joint surface between the flange portion 1a and the flange portion 4a, the joint surface between the flange portion 4a and the flange 6a, and the joint surface between the flange portion 6a and the peripheral end portion 5a of the blind plate 5. A member 7 is interposed. Inside the body 4 of the hollow member 3 having the above structure, there is a disc-shaped valve body 8 which opens and closes the inside of the hollow member 3 by rotation, and which faces the inside of the container 1 in a state of closing the hollow member 3. A valve body 8 having a surface to be inspected made of the same material as the container wall IA is provided so as to be rotatably supported. [0015] That is, a ring-shaped seal member 9 is fixed to the inner peripheral surface of the body 4 on the side of the container wall IA near a stem 12, which will be described later, and this seal member 9 prevents the rotation of the valve body 8. (The valve body 8 is formed to have a substantially rectangular cross section so as not to obstruct the hollow member 3.)
Then, the circumferential surface of the valve body 8 presses against the inner circumferential surface of the sealing member 9 to seal between the body 4 and the valve body 8, and the fluid inside the container 1 flows through the blind plate 5 of the body cap 6 of the hollow member 3. It is designed to prevent water from flowing into the side (window). A portion to be inspected made of the same material as the container wall IA is provided on the surface of the valve body 8 that faces the inside of the container 1 while the hollow member 3 is closed. The configuration of this portion to be inspected will be described later. [0016] At a position where the surface of the valve body 8 where the inspection target part is provided faces the inside of the container 1 and at a window provided in the hollow member 3 that can be opened and closed freely, that is, at a position facing the blind plate 5 side of the body cap 6, External operating means for rotating the valve body 8 is provided. This external operating means consists of a stem 12 whose inner end is fixed to the valve body 8 and whose outer end penetrates a through support hole 11 formed in the body 4 and projects to the outside. [0017] This stem 12 is orthogonal to the central axis of the body 4, is arranged to extend on the rotation axis of the valve body 8 on which the force valve body 8 rotates to open and close the hollow member 3, and has an inner end thereof. portion is fitted into a groove portion 8a formed on the circumferential surface of the valve body 8. An operating handle (not shown) is detachably attached to the outer end of the stem 12. In addition, in the structure of the outer peripheral part of the stem 12, 13 is a thrust washer, 14 is a pa-no-king, 15 is a thrust bearing, 16 is a gland for suppressing backing, and 17 is a stem bearing.
2 is rotatably supported in the through support hole 11 while sealing the inside of the hollow member 3. [0018] Further, on the circumference of the valve body 8 on the side opposite to the side where the stem 12 is fixed,
A support shaft 12A is fitted with play into a groove 8b formed on the circumferential surface of the valve body 8, and the support shaft 12A is fitted with play.
2A is fixedly supported in a through support hole 11A formed in the body 4. Therefore, the stem 12 is moved from the closed state of the valve body 8 in FIG.
When the valve body 8 is rotated 80 degrees, the surface of the valve body 8 where the inspection target part is provided faces the inside of the container 1 through the opening 2, and then rotates 180 degrees to the blind plate 5 side (window portion) of the body cap 6. The valve body 8 shown in FIG. 3 is in the closed state. [0019] Here, in the process of rotating the valve body 8 as described above,
When the valve body 8 is temporarily opened, the inside of the container 1 and the body
The internal space of the cap 6 communicates with each other, and the internal fluid of the container 1 flows into the internal space of the body-cap 6. Therefore, fluid accumulates in the internal space of the body-cap 6, so it is preferable to discharge the fluid accumulated in the internal space of the body-cap 6 to the outside. [0020] Therefore, in this embodiment, the following discharge means is provided. That is, short pipes 25 and 26 are connected to the upper and lower sides of the circumferential wall of the body cap 6, respectively. A vent valve 27 is connected to the opposite end of the upper short pipe 25 and a drain valve 28 is connected to the opposite end of the lower short pipe 26. [0021] Next, the configuration of the above-described portion to be inspected will be explained. In this embodiment, the valve body 8 is made of a corrosion-resistant metal, and a T-shaped test piece 19 made of the same material as the container wall IA is fixed to the end face of the valve body 8 by a corrosion-resistant screw 29 or by welding. (See FIGS. 1 and 2 for details) This test piece 19 is used to measure conditions such as corrosion and wear. In this case, the thickness t of the test piece 19 may be measured. [0022] In this configuration, by rotating the stem 12, the valve body 8
is rotated to the closed position of the hollow member 3 so that the test piece 19 is in a position facing the inside of the container 1 through the opening 2 of the container wall IA (see FIG. 1). In this state, the test piece 19 is exposed to the fluid under the same conditions as inside the container 1. When the inspection time comes, the stem 12 is rotated 180 degrees from the state shown in FIG. The member 3 is rotated to the closed position (see FIG. 3). [0023] Then, the blind plate 5 is removed and the test piece 19 is inspected for wear, corrosion, etc. by measuring the thickness t of the test piece 19. Note that when the valve body 8 is in the closed state of the hollow member 3 as shown in FIGS. Since the gap is sealed, the fluid inside the container 1 is reliably prevented from flowing into the hollow member 3. When the valve body 8 is rotated, the valve body 8 is temporarily opened, and the internal fluid of the container flows into the internal space of the body cap 6 and accumulates therein. , the accumulated fluid is drained out before removing the blind plate 5. [0024] In this case, the exhaust valves such as the vent valve 27 and the drain valve 28 may be opened. According to the material inspection device having the above configuration, a valve body 8 which opens and closes the inside of the hollow member 3 by rotation is installed inside the hollow member 3 connected to the opening 2 of the container wall IA. A valve body 8 is provided with a portion to be inspected made of the same material as the container wall IA on a surface facing the inside of the container 1 in a closed state, and is supported and freely rotated. Since the valve body 8 is configured to be rotated so that the surface facing the inside of the container 1 faces the inside of the container 1 and the position facing the window provided in the hollow member 3 that can be opened and closed freely, it is possible to Temporarily stop, open the flanges of equipment and piping, etc.・・Putting in and taking out the 2' test 1・1 piece, 1-(・)boo The work that was previously done is unnecessary: Kneeliboon. ．． :h equipment]・I. Effects on the operation of the container (47) such as corrosion and wear of the material of the container 1. ↓'': Please take a look. [0025] In particular, in the inspection device previously proposed by the present applicant, as a result of using a spherical member that always closes the opening as a member for providing the inspection target section, Although it has the advantage that the fluid inside the structure does not leak to the outside when the spherical member is rotated when performing an inspection, the manufacturing cost is high.However, in the above configuration, as a member where the inspection target part is provided, As a result of applying the valve body 8, when the valve body 8 is rotated, the valve body 8 is temporarily opened, and the internal fluid of the container flows into the internal space of the body cap 6.
If left as is, the fluid would leak out to the outside, but since the body cap 6 is provided with a window that can be opened and closed freely by the blind plate 5, the fluid inside the container 1 will not leak out when the valve body 8 is operated. It has the same advantage as the inspection device previously proposed by the applicant in that it does not leak. [0026] As a result of applying the valve body 8, the inspection device previously proposed by the present applicant can be easily manufactured using an existing device instead of a dedicated device, and the manufacturing cost can be kept low. It has advantages not found in For example, the structural part provided with the valve body 8 can be constructed from a general butterfly valve for opening and closing a pipeline. [0027] In addition to the butterfly valve described above, as shown in FIG. 6, it has two seat parts 32 and 33, and if the seat part 32 used in the figure is the primary seat, After a period of use, the disc 34 can be removed without removing the valve.
It is also possible to use a butterfly valve with a seat structure that rotates once and uses the other seat portion 33 as a secondary seat. [0028] Furthermore, as shown in FIG. 7, a valve having a double disk structure in which both ends of a ball are cut off with a flow path 36 in between can be used as the valve body 35. In addition to butterfly valves, ball valves can also be used. In the case of a ball valve, a through hole is formed in the ball-shaped valve body, so a flat surface is cut and formed on the outer surface of the valve body located in a direction perpendicular to the through hole, and the part to be inspected is provided on this flat surface. do. [0029] Next, another embodiment of a structure for attaching the hollow member 3 provided with the valve body 8 to a container, piping, etc. will be described based on FIGS. 4 and 5. In the embodiment shown in FIG. 4, the hollow member 3 is attached to a container or the like via a nozzle 20. In this case, the flange portion 20a provided on the nozzle 20 and the flange portion 4a on the body 4 side of the hollow member 3 are fastened and connected using bolts and nuts. [00301 In this case, the surface nozzle 20 provided with the inspection target portion of the valve body 8
It will come within. In the embodiment shown in FIG. 5, for example, when connecting the hollow member 3 to piping, a body 4 constituting the hollow member 3 is attached to a short pipe 21 interposed and connected between the piping.
It is integrally molded. In this case, the surface of the valve body 8 on which the inspection target portion is provided faces the inside of the short pipe 21. Further, the short tube 21 is made of a high-grade material with excellent corrosion resistance. Further, the surface of the valve body 8 on which the inspection target portion is provided is a curved surface portion 8 corresponding to the inside of the short pipe 21.
B, and the condition of the curved surface portion 8B may be visually observed to check for corrosion, wear, etc. [0031] Next, another example of the configuration of the inspection target section will be described. That is, as shown in FIG. 4, the valve body 8 itself is made of the same material as the device main body wall IA, and a pair of corrosion-resistant metal rods are attached to the end face of the valve body 8, which constitute a reference part when measuring with the depth gauge 30. The rods 31 are arranged in parallel and fixed by welding, and the distance from the outer peripheral end surface of the rods 31, 31 to the surface of the valve body 8 is measured at a corrosion measurement point CG P (corrosion gauge po).
int), and after abutting the depth gauge 30 against the outer peripheral end surfaces of the pair of rods 31, 31, the probe of the depth gauge 30 is applied to the surface of the valve body 8, and the corrosion measurement point CGP is
The degree of corrosion may be measured. Furthermore, instead of welding the bar 31, the bar 31 may be fixedly attached using a corrosion-resistant screw, screw, or the like. [0032] Alternatively, the valve body 8 may be formed of a corrosion-resistant metal, the bar 31 may be used as a test piece, and the corrosion state of the bar 31, which is made of the same material as the device main body wall IA, may be inspected. Further, the test piece 19 and the rod 31 are removed from the valve body 8, and the valve body 8 itself is made of the same material as the container wall IA, so that when the valve body 8 is closed, the valve body 8 faces the inside of the container 1. The surface may be visually inspected to check for corrosion, wear, etc. In any case, it is preferable that the parts to be inspected, such as the test piece 19 and the end face of the valve body 8 itself, be located on the same plane as the container wall IA to equalize the conditions for the fluid in contact with them. [0033]

【Effect of the invention】

As explained above, according to the present invention, it is possible to inspect the state of corrosion, wear, etc. of the material of the structure that handles fluid without affecting the operation of plant equipment, etc. It is possible to prevent a decrease in the rate and reduce operating costs and maintenance costs. [0034] In particular, since a valve body is used as the member for providing the part to be inspected, it can be easily manufactured using existing valves and other devices rather than a dedicated device, and the manufacturing cost can be reduced. It is possible to keep the cost low.

[Brief explanation of drawings]

[Fig. 1] A sectional view showing an embodiment of a material inspection device for a structure that handles fluid according to the present invention.

[Figure 2] Side view of the valve body in the above device

[Figure 3] Cross-sectional view showing the inspection method using the same device

[Fig. 4] Cross-sectional view showing another embodiment of the present invention

[Fig. 5] Cross-sectional view showing another embodiment of the present invention

[Fig. 6] A perspective view showing the structure of a general valve that can be used in the device of the present invention.

[Fig. 7] A perspective view showing the structure of a general valve that can be used in the device of the present invention.

[Explanation of symbols]

1 Container IA wall 2 Opening 3 Hollow member 4 Body 6 Body cap 8. Valve body 9 Seal member 11 Through support hole GP stem Test piece nozzle short tube Corrosion measurement point

[Document person]

drawing

[Figure 1]

[Figure 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

Claims (1)

[Claims] 1. A valve body, wherein a hollow member is provided outside the structure and connected to an opening formed in a wall of a structure that handles fluid, and the valve body opens and closes the inside of the hollow member by rotating inside the hollow member. A valve body is provided with an inspection target portion made of the same material as the structure wall on a surface facing the inside of the structure in a state where the hollow member is closed, and is rotatably supported inside the hollow member. External operating means for rotating the valve body is provided at a position where the surface of the valve body where the inspection target portion is provided faces the inside of the structure and a position where the surface facing the window portion provided in the hollow member that can be freely opened and closed is provided. Features: A material inspection device for structures that handle fluids.