JPS6338909Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lining structure for a flange portion of a chemical container whose inner surface is lined with a corrosion-resistant material such as Ti, Zr, Ta, or Nb (hereinafter simply referred to as "lining material").

For chemical containers (hereinafter referred to as "container bodies"), especially containers that handle corrosive fluids or containers that are used under harsh operating conditions (e.g., under high temperature and high pressure), the material of the container itself In particular, materials with excellent corrosion resistance are required. Corrosion-resistant materials such as Ti, Zr, Ta, and Nb can be considered as materials that can adequately meet these requirements, but since these materials are extremely expensive, general structural materials are used for most of the container body. , only the inner surface of the container body is lined with the above corrosion-resistant material.

By the way, when fixing the above-mentioned lining material to the container material, generally the end of the lining material is flanged or a flange liner ( A lining material 4 made of the same material as the lining material 3 is installed and welded to its inner peripheral surface. However, the lining material 3 is simply a corrosion-resistant material welded into a flat plate and attached to the inner surface of the container body 1, and in the case of FIG. As a result, gaps tend to be unevenly distributed between the joint surface 2a and the flange liner 4 and between the inner circumferential surface of the flange portion 2 and the outer circumferential surface of the lining material 3, as shown in FIG. That is, flange liner 4
And the sealing performance between the lining material 3 and the flange portion 2 is reduced. As a result, corrosive fluid enters and stagnates through the gaps, causing corrosion on the inner surface of the container body 1. Furthermore, when the inside of the container becomes high pressure under usage conditions, the lining parts unevenly distributed in the gaps are damaged. This poses a major problem in ensuring operational safety. Of course, in order to prevent such accidents from occurring, a leak detection device is connected to the leak detection test hole 5 provided through the flange portion 2, and the above-mentioned sealing performance test is performed using the detection device. It is done regularly. However, as shown in Figure 2, as the sealing performance deteriorates, the gap between the flange liner 4 and the joint surface 2a increases, so the leak detection method using the leak detection test hole 5 is practically useless. do not have.

The inventor of the present invention has also carried out intensive studies in order to solve the above problem, and as described below, the end of the lining material (including the flange liner mentioned above) is completely fixed to the joint surface of the flange part. As a result, the inventors discovered that the above-mentioned needs could be met, and arrived at the lining structure of the flange portion of the chemical container of the present invention.

However, the lining structure of the present invention is such that a cladding material part made of a corrosion-resistant metal material made of the same material as the lining material of the container body is laminated with a corrosion-resistant metal material layer on at least the joint surface side of the flange part of the container body. is formed on the outer surface, and
The gist is that the corrosion-resistant metal material of the cladding material part and the lining material of the container body are joined by welding.

The configuration and effects of the present invention will be explained below based on the drawings of the embodiments. FIG. 3 is a cross-sectional view of the main parts when the present invention is applied to the shell flange of a multi-tubular heat exchanger, where 31 is the shell body, 32 is the shell flange,
33 is a lining material attached to the inner surface of the trunk body 31, and 34 is a flange liner attached to the tip of the lining material 33. Further, 35 indicates a cladding material part, and 35a is a corrosion-resistant metal material (hereinafter simply referred to as "corrosion-resistant") made of the same material as the lining material 33;
35b is a general structural material (hereinafter simply referred to as "general material") made of the same material as the body flange 32. Then, the flange liner 34 is welded to the corrosion-resistant material 35a,
On the other hand, the body flange 32 is welded to a general material 35b. This welding is extremely good because it is performed between two pieces of the same material. Further, since the corrosion-resistant material 35a and the general material 35b are clad materials, they are completely integrated. Therefore, the flange liner 34 is completely fixed to the body flange 32 via the cladding material 35, and the flange liner 34 does not undergo thermal contraction in the radial direction. Therefore, the sealing performance is extremely good, and the roundness of the lining material 33 can also be maintained relatively well. Therefore, the fear of corrosion and strength deterioration is eliminated.

Next, FIG. 4 is a sectional view of the main part when the present invention is applied to the head flange part of a shell-and-tube heat exchanger.
41 is the head body, 42 is the head flange, and is made of a general material 4 with a corrosion-resistant material 42a pasted on the joint surface side.
It is made of clad material consisting of 2b. Also 4
3 is a lining material attached to the inner surface of the head main body 41, and 44 is a flange liner attached to the tip of the lining material. and flange liner 4
4 is welded to a corrosion-resistant material 42a. Therefore, due to the same effect as in the case of the body flange described above, there is no fear of gaps occurring between the joint surfaces of the flange liner 44 and the corrosion-resistant material 42a, and between the outer surface of the lining material 43 and the inner surface of the head flange 42, and the sealing performance is extremely good. becomes. Therefore, there is no fear of corrosion or strength deterioration in this case either.

Although FIGS. 3 and 4 show an example of application to a container flange portion having a flange liner at the end of the lining material, a structure as shown in FIG. 5 is also included in the present invention. That is, the body flange 5
A stepped corrosion-resistant material 52a is laminated to the joint surface of the parts 2 and 2, and the inner surface of the corrosion-resistant material 52a and the lining material 33 are bonded together.
By directly welding the tip of the stepped corrosion-resistant material 52a, the upper part of the stepped corrosion-resistant material 52a can serve as the above-mentioned flange liner.

In addition, in any of the embodiments shown in FIGS. 3, 4, and 5, there is no gap between the lining material and the container body, so the test holes 35, 45, and 55 for leak detection are used. The leak detection method can fully demonstrate and maintain the desired detection performance, and from this point of view, sealing measures are also perfect.

It should be noted that the above embodiment merely shows one typical example and does not limit the nature of the present invention.In line with the above-mentioned purpose, for example, the lining structure of the body flange part (Fig. 3) may be added to the head flange part. The lining structure (Fig. 4) may be adopted, or conversely, the lining structure of the body flange (Figs. 3 and 5) may be adopted as the lining structure of the head flange (Fig. 4). Moreover, there are of course no restrictions on the shape and dimensions of the clad material part, and the material can also be changed within a range that does not interfere with welding.

In the above embodiments, the case of a shell-and-tube heat exchanger was explained as a "container," but it also includes other types of chemical equipment such as heat exchangers, reactors, separators, and even piping. By applying the present invention to these flange portions, the same effects as in the above embodiments can be obtained.

The lining structure of the present invention is constructed as described above, but the key point is that by using the clad material, the end of the lining material attached to the container body can be welded and fixed to the flange surface of the container body. Therefore, it was possible to prevent the occurrence of a gap between the lining material and the container body, perfect the sealing performance, and improve the roundness of the attached lining material. the result,
This eliminates the risk of corrosion of the container body and deterioration of strength due to buckling of the lining material, contributing to extending the life of the lined container.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part showing a conventional lining structure, Fig. 2 is an explanatory diagram of the operation of the conventional lining structure, and Figs. 3 and 4 are sectional views of main parts illustrating the lining structure of the present invention. , FIG. 5 shows a modified example. 1... Container body, 2... Container flange, 3, 3
3,43...Lining material, 4,34,44...
Flange liner, 31... Trunk body, 32... Trunk flange, 35... Clad material part, 35a, 42
a, 52a...corrosion resistant, 35b, 42b, 52b
... General material, 41 ... Head body, 42 ... Head flange.

Claims (1)

[Scope of utility model registration request] A lining structure for a flange formed at the end of a both-end open container or one-end open container whose inner surface is lined with a corrosion-resistant metal material, wherein at least the joint surface side of the flange is lined with a metal of the same quality as the corrosion-resistant metal material. A cladding material portion formed by laminating materials is formed with the corrosion-resistant metal material layer on the outside surface, and the corrosion-resistant metal material of the cladding material portion and the corrosion-resistant metal material of the inner surface of the container are welded and joined. The lining structure of the flange part of chemical containers.