JPH0541353B2 - - Google Patents

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides lining material for members that come into contact with corrosive fluids in can manufacturing equipment such as shell-and-tube heat exchangers by using countersunk bolts screwed into the members. The present invention relates to a method for fixing a lining material.

[Prior art]

Conventionally, when flowing a corrosive fluid in can manufacturing equipment such as a shell-and-tube heat exchanger 1 as shown in FIG.
Cheve 2 showing the corrosive fluid in the enlarged view of the main part in Figure 4
A corrosion-resistant material was used as the lining material 4 on the channel 3 side, but at this time, for the tube plate 6 to be joined to the channel flange 5, a cheap general material could be used on the shell 7 side, and the tube plate 6 Since the thickness of the lining material 4 is also increased, the cost is reduced by using lining material 4 or cladding material.

However, in this case, there are restrictions on the type and thickness of the clad material, and when the lining material 4 is used, it is necessary to weld and fix the lining material 4 to the tube plate 6, which is a general material, as shown by arrow A. Therefore, it was not possible to adopt a combination of the tube sheet 6 and the lining material 4 that was not suitable for welding.

On the other hand, a lined housing consisting of a metal housing lined with a molded non-metallic liner, a metal plate embedded within the non-metallic liner, and a metal anchor having a metal stud protruding from the non-metallic liner and welded to the metal housing; Joints for piping systems are known (Japanese Unexamined Patent Publication No. 1983
-Refer to Publication No. 191393).

However, in this joint, a metal anchor embedded in a non-metallic liner is welded directly to the base metal housing;
When only the tip of the metal stud in a metal anchor is welded, the strength of the welded part is weak because the welded part does not have complete penetration, and cannot withstand high pressure. Furthermore, if the welded portion is completely penetrated, there is a risk that the non-metallic liner will melt due to the heat during welding.

In addition, this joint cannot be welded if the groove provided in the metal housing and the non-metallic anchor embedded in the non-metallic liner are misaligned, so it is necessary to determine the position of the groove provided in the metal housing and the position of the metal anchor embedded in the non-metallic liner. The drawback is that high accuracy is required.

[Purpose of the invention]

The present invention was made to overcome such conventional problems, and its purpose is not only to prevent thermal distortion or strength deterioration in the base material tube sheet, but also to directly damage the base material tube sheet. A method for fixing lining materials that makes it possible to line lining materials that cannot be welded, allows the lining material to be replaced without damaging the base material (tube sheet), and does not require high precision in positioning the through holes provided in the lining material. Our goal is to provide the following.

[Structure of the invention]

A method for fixing a lining material according to the present invention that can achieve the above object is to screw a countersunk bolt made of the same material as the lining material or a weldable material onto the surface of a tube plate of can making equipment, and then to face the countersink bolt. The present invention is characterized in that a through hole is bored at the position of the lining material, then the lining material is set on the tube sheet, and then the lining material and the countersunk bolt are connected by plug welding.

〔Example〕

An embodiment in which a lining material is fixed to a base material using the fixing method of the present invention will be described below with reference to the drawings. FIG. 2 is an enlarged side sectional view of the periphery of the embedded member in FIG. 1;

First, FIG. 1 shows a state in which the lining material 4 is fixed to the tube plate 6 of the shell-and-tube heat exchanger 1 in the conventional example shown in FIGS. 3 and 4 by the fixing method of the present invention. This shell-and-tube heat exchanger has almost the same construction as the conventional example shown in FIG. 4, and the same parts are indicated by the same part numbers.

Therefore, in the fixing method of the present invention, as shown in FIG.
Then, a plurality of embedded members made of the same material as the lining material 4 or a material easily welded to the lining material 4, such as countersunk bolts 8 in this embodiment, are inserted into the screw holes previously provided in the tube plate 6. It is embedded by mechanical means such as screwing.

Next, the lining material 4 that is to be lined with the tube sheet 6 also has a plurality of tapered bolts that can be plug-welded at the same positions as the countersunk bolts 8, which are embedded members embedded in the tube sheet 6. A hole 9 is drilled.

Furthermore, as shown in FIG. 2, this lining material 4
The lining material 4 can be easily and reliably welded to the tube sheet 6 by plug welding each hole 9 and the head of the countersunk bolt 8 as shown by the arrow W. Can be fixed.

In the above fixing method, the countersunk bolts 8 are mechanically embedded in the tube plate 6, and the countersunk bolts 8 and the lining material 4 are plug welded together through the tapered holes 9 drilled in the lining material 4. W, so that the lining material 4 is fixed to the tube sheet 6 by mechanical connection (screwing) using the countersunk bolts 8. Therefore, this fixing method can be used for any combination of materials for the lining material 4 and tube sheet 6.

In addition, when the lining material 4 and the countersunk bolt 8 are made of the same material, by making the plug welding W the same material as the lining material 4, the corrosion allowance of the lining material 4 and the corrosion allowance of the plug welding W can be made the same. . In other words, the lining material has the same corrosion resistance as a single piece.

Furthermore, since the countersunk bolt 8 is completely embedded in the base material 6, the surface of the lining material 4 can be machined.

Furthermore, since the countersunk bolt 8 is used as the member for fixing the lining material, even if the position of the hole 9 bored in the lining material 4 is slightly shifted, there is no problem with plug welding. Therefore, there is no need to make the positioning accuracy of the hole 9 particularly strict.

Furthermore, it can be applied to large lining materials for which positioning accuracy is difficult to achieve.

Further, when the lining material 4 is fixed to the tube sheet 6 of the heat exchanger 1 as in this embodiment, the lining material 4 is fixed to the tube sheet 6 due to the hydraulic pressure of the corrosive fluid flowing therein.
Since it has a pressing effect, there is no need to provide so many locations for plug welding, and fixation can be achieved by arranging, for example, several locations for plug welding on the circumference.

The fixing method of the present invention can be particularly effectively applied to fixing a lining material to a member that comes into contact with a corrosive fluid in can manufacturing equipment such as a shell-and-tube heat exchanger.

〔Effect of the invention〕

As described above, in the present invention, the lining material is joined to the countersunk bolt screwed into the tube sheet of can making equipment by plug welding, so that no thermal distortion occurs in the tube sheet, which is the base material, due to welding. Furthermore, since the screw holes for embedding the countersunk bolts are blind holes that do not penetrate through the tube sheet, which is the base material, the strength of the tube sheet is sufficiently maintained.

Furthermore, as described above, the present invention connects the lining material to the countersunk bolt screwed into the tube sheet by plug welding, so that it is possible to line the lining material that cannot be directly welded to the tube sheet, which is the base material, and to The lining material can be replaced without damaging the tubesheet.

Furthermore, in the present invention, even if the position of the through hole in the lining material deviates within the area of the head of the countersunk bolt, there is no problem with welding, so the positioning of the through hole in the lining material can be performed with high precision. There's no need to do it. If the head of the countersunk bolt is made larger, it also has the advantage of being able to absorb large deviations in the position of the holes in the lining material.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a main part in an embodiment of the present invention, FIG. 2 is an enlarged side sectional view of the surroundings of the embedded peripheral member in FIG. 1, and FIG. 3 is an overall side sectional view of a conventional heat exchanger. FIG. 4 is an enlarged side sectional view of the main part around the tube plate of the multi-tubular heat exchanger shown in FIG. 3. 4...Lining material, 6...Tube sheet, 8...Countersunk bolt, 9...Hole, W...Plug welding.

Claims (1)

[Claims] 1. After screwing a countersunk bolt made of the same material as the lining material or a weldable material into the tube plate surface of the can making equipment, a through hole is drilled in the lining material at a position opposite to the countersink bolt, and then the lining material is A method for fixing a lining material, comprising: setting the lining material on the tube sheet, and then joining the lining material and the countersunk bolt by plug welding.