JPH086853B2 - Seal flange device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a seal flange device, and particularly facilitates supply and discharge of a fluid for a pressure resistance test and ensures a pressure resistance test. Regarding things.

(Prior Art) A conventional example will be described with reference to FIGS. Fifth
The figure is a cross-sectional view of a flange joint portion of a pressure vessel, and in the figure, reference numerals 1 and 2 are pressure vessel constituent bodies constituting the pressure vessel. Flange 3 and 4 are fixed to the ends of these pressure vessel structures 1 and 2, respectively. A gasket 5 is inserted between the flanges 3 and 4. The pair of flanges 3 and 4 are fastened by bolts and nuts (not shown), and thereby the gasket 5 is fastened and sealed.

As a configuration using the gasket 5, there is also a configuration as shown in FIG. This is one in which an annular groove 4a is formed on the flange 4 side and a gasket 5 is mounted in this annular groove 4a.

According to the configurations shown in FIGS. 5 and 6, there is a risk that the internal fluid may flow out due to deterioration of the gasket 5 over time, a decrease in gasket tightening force due to relaxation of bolts, etc., and a seal only by the gasket 5. Is limited. When a radioactive fluid is used as the internal fluid, the material of the gasket 5 is selected so that the leakage of the internal fluid is zero as much as possible, or the tightening force by the bolt is properly controlled. At the same time, so-called seal flanges are used. This will be described with reference to FIGS. 7 and 8. Note that FIG. 8 is an enlarged view of a part of FIG. 7. Reference numerals 11 and 12 in FIG. 7 denote container components, and these container components 11 and 12 have flanges, respectively.
13 and 14 are stuck. Further, annular lip portions 15 and 16 are fixed to the opening side end portions of the container constituent bodies 11 and 12. An annular groove 17 is formed at an inner radial position of the annular lip 15 of the container structure 11, and a gasket 18 is mounted in the annular groove 17. The outer peripheral ends of the annular lips 15 and 16 are welded. Reference numeral 19 in the figure is the welded portion.

According to such a configuration, since the outer peripheral ends of the annular lips 15 and 16 are welded, the leakage of the radioactive fluid is reliably prevented. In addition, the integrity test (pressure resistance test) of the welded portion 19 is performed within the container by 1.5 times the design pressure of the container (water pressure test) or 1.2
It is performed by applying 5 times (atmospheric pressure test). When the internal inspection is performed after the use for a certain period of time, first, the outer peripheral portions of the annular lips 15 and 16 are cut. Then, unfasten the bolts and nuts, disassemble, and inspect the interior. After the inspection, return to the original state and perform the above-mentioned pressure resistance test.

 The above configuration has the following problems.

First, when performing a water pressure test, if the internal volume of the container is large, a large amount of water for the pressure resistance test is required, and the treatment of the test water after the test becomes a problem. That is, the inside of the container is contaminated by radioactivity, and therefore the test water is also contaminated. Therefore, there is a concern that radioactivity will be contaminated unless a predetermined treatment is performed.

In addition, there are cases where the test water cannot flow into the container because the container is filled with a catalyst or the like. In this case, the atmospheric pressure test is performed. At that time, if the test pressure is high, there is a risk of explosion, etc., and seat leakage from the isolation valve or drain valve (not shown) of the container is expected, and in that case it becomes impossible to maintain the prescribed test pressure. I will end up.

(Problems to be Solved by the Invention) As described above, in the case where the conventional seal flange is used, when a water pressure test is performed, a large amount of water is required and the treatment of the test water becomes a problem. However, there is a problem in that it is difficult to maintain the test pressure when performing the above, and the present invention was made based on such a point. It is to provide a seal flange device which can be

[Configuration of the Invention] (Means for Solving Problems) That is, a seal flange device according to the present invention includes a first flange, a second flange fastened to the first flange by a plurality of bolt and nut mechanisms, and A first annular lip formed on the second flange side end of the first flange;
A second flange formed on an end portion of the second flange on the first flange side and abutting against the first annular lip to weld an outer peripheral end thereof;
An annular lip, an annular gasket inserted between the first flange and the second flange, an annular closed space formed on the outer peripheral side of the gasket, and one of the first flange and the second flange. And one end is opened to the annular closed space and the other end is detachably connected to the pressurizing pump, and is formed in one of the first flange and the second flange, and the one end is formed. A fluid discharge passage for pressure resistance test is provided, which is opened to the annular closed space and has the other end closed during a pressure resistance test and connected to an on-off valve opened after the test is completed.

(Function) That is, an annular closed space is formed on the outer peripheral side of the gasket,
A pressure resistance test fluid is enclosed in the annular closed space using a pressure resistance test fluid supply path and a pressure resistance test fluid discharge path to perform a pressure resistance test.

(Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a cross-sectional view of a flange joint portion of a pressure vessel, and reference numerals 101 and 102 in the figure denote vessel constituent bodies. Flange 103 and 104 are fixed to these container constituents 101 and 102, and annular lips 105 and 1 are provided at the tip end.
06 is projected. An annular groove 107 is formed on the end surface of the container structure 101, and a gasket is provided in the annular groove 107.
108 is installed. The flanges 103 and 104 are fastened by bolts and nuts (not shown). The outer peripheral ends of the annular lips 105 and 106 are welded.
Reference numeral 109 in the figure denotes the welded portion.

The annular groove 107 on the outer peripheral side of the gasket 108 is the annular space 11
It is 0. The flange 104 has the annular space 110.
A first flow path 111 that communicates with the outside is formed, and a pipe 112 is connected to the first flow path 111. This piping
An on-off valve 113 is connected to 112. Also flange 104
A second flow path 114 is formed in the second flow path 114, and the second flow path 114 is also an annular space.
Connect 110 and the outside. A pipe 115 is provided in the second flow path 114.
Is connected, and a pressurizing pump 116 is connected to the pipe 115.

The operation will be described based on the above configuration. First, when fastening the container constituents 101 and 102, first, the container constituents 101
The gasket 108 is mounted in the annular groove 107 formed at the end of the. Flange with multiple bolts and nuts in this state
Conclude 103 and 104. Finally, the outer peripheral ends of the annular lips 105 and 106 are welded.

Next, the breakdown voltage test will be described. First pressurizing pump 116
Thus, the pressure resistant test water is supplied into the annular space 110 via the pipe 115 and the second flow path 114. At that time, the on-off valve 113 is opened, and the air is exhausted through the first flow path 111 and the pipe 112. After exhausting, the on-off valve 113 is closed and the pressurizing pump 116 is
To pressurize to a specified pressure. In this state, the pressure resistance test is performed by leaving it for a preset time. At this time, the inside of the container is sealed by the gasket 108.

Next, after completion of the pressure resistance test, first, the opening / closing valve 113 is opened, the pressurizing pump 116 is removed, and the pressure resistance test water sealed in the annular space 110 is extracted. This pressure resistance test water is not activated because it does not come into contact with the internal fluid and the like, and is therefore discarded after being processed by the usual processing method. Next, when the annular space 110 and the like are dried, the dry air is supplied through the pipe 112 and exhausted through the pipe 115. Alternatively, it is performed by connecting a vacuum pump (not shown) to the pipe 115 and drawing a vacuum. When all the work is completed in this way, the pipes 112 and 115 are removed and the first flow passage 111 and the second flow passage 114 are seated as shown in FIG.
7 and blind plug 118. The first flow path 11 is shown in FIG.
Although only 1 is shown, the same applies to the second flow path 114.

According to this embodiment, the following effects can be obtained.

First, in the water pressure test, the pressure test water is not enclosed in the container as in the conventional case, but is filled in the annular space 110 on the outer peripheral side of the gasket 108, so that the amount of the pressure test water can be small.

Further, the pressure-resistant test water is not activated because it is filled in the annular space 110 on the outer peripheral side of the gasket 108 and does not flow into the container, so that the pressure-resistant test water can be treated by ordinary treatment.

Next is the case of the atmospheric pressure test, but in this case, as in the case of water pressure, only the pressurized gas is enclosed in the annular space 110, so the amount is small and there is no contact with the inside of the container. So it's extremely safe.

Further, unlike the conventional case, there is no seat leak of the isolation valve or the drain valve of the container, so that the test pressure can be reliably maintained. Further, since the second flow path 114 for supplying the fluid and the first flow path 111 for discharging the fluid are separately provided, it is easy to supply and discharge the fluid, so that pressurization and depressurization can be performed quickly. It is possible to carry out the pressure resistance test.

Next, a second embodiment will be described with reference to FIG. Reference numerals 121 and 122 in the drawing denote container structures, and these container structures 12
Flanges 123 and 124 are fixed to the opening side end portions of 1 and 122. And the container structures 121 and 122 are the above-mentioned flanges.
It is fastened by a plurality of bolts and nuts (not shown) with another flange 125 interposed between 123 and 124.
An annular lip 126 is formed at the end of the flange 123, and an annular lip 127 is also formed at the end of the flange 125. The outer peripheral ends of these annular lips 126 and 127 are welded. Reference numeral 128 in the figure is the welded portion.
An annular groove 129 is formed on the end surface of the flange 123, and a gasket 130 is mounted in the annular groove 129. An annular space 131 is formed in the annular groove 129 at the outer peripheral position of the gasket 130. The flange 13 is formed with a first flow path 132 that communicates the annular space 131 with the outside, and a pipe 133 is connected to the first flow path 132. This piping
An on-off valve 134 is connected to 133. A second flow path 135 is also formed in the flange 123, and a pipe 136 is connected to the second flow path 135 and a pressurizing pump 137 is further connected. On the other hand, a gasket 138 is inserted between the flanges 124 and 125. The left side of the flange 125 in the drawing is filled with the radioactive fluid 139, and the right side of the drawing is filled with the non-radioactive fluid 140.

Therefore, the same operations and the same effects as in the case of the first embodiment such as fastening / disassembling of the container structural bodies 121 and 122, pressure resistance test and the like can be obtained.

Next, a third embodiment will be described with reference to FIG. In the third embodiment, the flange 125 has a first channel 132 and a second channel 135.
The other structure is the same as that of the second embodiment. Therefore, the same action and effect as those of the second embodiment can be obtained.

The present invention is not limited to the above-mentioned embodiment, and may be applied to, for example, a flange joint portion of a pipe as well as a flange joint portion of a pressure container as an application place.

[Effects of the Invention] According to the seal flange device of the present invention as described above, in the case of performing a pressure resistance test, the amount of pressure resistance test water required for the pressure test is significantly reduced, and in the case of a pressure test, the pressure resistance is maintained. As a result, the pressure resistance test can be made reliable and the pressure resistance test can be made easy and reliable, and so on. Further, since the pressure resistance test fluid supply path and the pressure resistance test fluid discharge path are provided separately, it is easy to supply and discharge the fluid, and thus the pressure resistance test is performed by rapidly pressurizing and depressurizing. be able to.

[Brief description of drawings]

1 and 2 are views showing a first embodiment of the present invention, FIG. 1 is a sectional view of a flange joint portion, and FIG. 2 is a sectional view showing a state of the flange joint portion after completion of a pressure resistance test, Figure 3 is second
A sectional view of a container showing an embodiment, Fig. 4 is a sectional view of a container showing a third embodiment, and Figs. 5 to 8 are views showing a conventional example.
5 and 6 are sectional views of the flange joint portion, FIG. 7 is a sectional view of the container, and FIG. 8 is an enlarged sectional view of a part of FIG. 7. 101, 102 ... Container structure, 103, 104 ... Flange, 105, 106 ...
Annular lip, 107 ... annular groove, 108 ... gasket, 109 ... welded portion, 111 ... first flow path, 114 ... second flow path.

Claims (2)

[Claims] 1. A first flange, a second flange fastened to the first flange by a plurality of bolt and nut mechanisms, and a first annular lip formed at an end of the first flange on the second flange side. A second annular lip formed at an end portion of the second flange on the first flange side and abutting the first annular lip and welding an outer peripheral end thereof, and the second annular lip is interposed between the first flange and the second flange. Annular gasket,
An annular closed space formed on the outer peripheral side of this gasket,
A pressure resistance test fluid supply path formed on either the first flange or the second flange, one end of which is opened to the annular closed space, and the other end of which is detachably connected to the pressure pump,
A pressure resistance test which is formed on either the first flange or the second flange and has one end opened to the annular closed space and the other end connected to an on-off valve that is closed during the pressure resistance test and opened after the test is completed. A seal flange device, comprising: a fluid discharge passage for use. 2. The gasket is mounted in an annular groove formed on an end face of either the first flange or the second flange, and the outer peripheral side of the gasket is an annular closed space in the annular groove. The seal flange device according to claim 1, wherein