JPS5927301B2 - How to line odd-shaped materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technique belongs to a technique for lining irregularly shaped materials, in which an inner tube for lining is inserted into the inner surface of the irregularly shaped tube, and the inner tube is expanded and fastened to form a lining.

Therefore, the present invention relates to a lining method in which a lining material such as a corrosion-resistant stainless steel material is attached and tightly fixed to a predetermined closed inner peripheral surface of a deformed material such as a deformed pipe such as a joint bellows pipe. In particular, by giving a relative temperature difference between the profiled material and the lining material independently of each other to increase the facing gap, or by arranging the lining materials facing each other,
After the lining material is installed, the above-mentioned temperature difference is applied to enlarge the facing gap, and then an expansion force is applied to the lining material by hydraulic pressure or the like to cause it to expand plastically, and then the above process is reversed. The present invention relates to a method for lining a profiled material in which the lining material is applied to the inner surface of the profiled material to securely propagate and fasten the material.

As is well known, fluid transport piping, such as plant piping, oil country tubular goods, and heat exchanger piping, may transport corrosive fluids, and high-temperature, high-pressure vessels, etc., must of course be pressure resistant. Therefore, corrosion resistance and airtightness are important design considerations.

Therefore, the pressure resistance and corrosion resistance of this kind of piping does not extend to the general parts of the pipe body, but also to irregularly shaped pipe parts such as so-called oil country tubular goods, tubing, bellows, and bent parts, and irregularly shaped pipe parts such as flanges and panels. It is also necessary to securely hold the parts that are joined to the material, and in pressure vessels as well, the lining material must be reliably stretched over the deformed material in terms of corrosion resistance and airtightness.

However, if the flow and storage conditions of the corrosive fluid vary in temperature, pressure, chemical composition, etc.,
Stress concentration due to differences in thermal expansion coefficients on bonded panels, etc.
In order to minimize problems such as shearing, buckling, fatigue failure, etc., it is desirable to have as large an interference as possible so that the joints behave tightly and integrally.

By the way, methods such as shrink fitting and hydraulic pipe expansion have generally been used to attach lining material to the inner surface of a certain irregularly shaped material, but in the former method, temperature differences are used. It has the disadvantage that only a small gap can be obtained at the border of the painting material, and it cannot be used for bent pipes, bellows pipes, oil country tubular goods, etc.

In addition, in the latter case, for example, if the yield stress of a deformed pipe is lower than that of an inner pipe, there is a drawback that the interference becomes negative, and therefore it becomes impossible to connect even if the pipe is expanded. combination,
The problem was that there were restrictions on selection, etc.

Furthermore, both countermeasures have the disadvantage that, for example, it is impossible to set conditions because the special structural characteristics of the irregularly shaped material itself, such as a pressure-resistant container, and the attachment and bonding are different from those of irregularly shaped pipes.

The purpose of the present invention is to solve the problem of attaching and fixing a lining material to a profiled material, and to solve the problem of attaching and fixing a lining material to a profiled material. By cooling or accompanying them, an additional opposing gap is interposed in the setting, and then an expansion force is applied to the set lining material to integrally expand the profiled material to the set degree, and then the expansion force is released. By reducing the size of the shaped material, cooling is applied to the heating of the irregular shaped material, and heating is applied to the lining material, so that the sizes of the two essentially overlap so that they can be reliably bonded. The purpose of the present invention is to provide an excellent method for lining deformed materials.

Next, embodiments of the present invention in accordance with the above object will be described below with reference to the drawings. First of all, the embodiments shown in Figures 1 to 4 show the lining of the bend of a double pipe, and the lining is lined within the inner closed inner peripheral surface of the outer pipe 1, which is a deformed member made of carbon steel. As shown in FIG. 1, a stainless steel tube 2 is made of stainless steel, and the outer diameter Di (D
The tube is inserted and attached based on the relationship O>Di), and is bent into a predetermined bent shape as shown in FIG. 2 using an appropriate well-known bending device.

Therefore, in the present embodiment, a coil heater is appropriately wound around the outer peripheral surface of the outer tube 1 to heat it, and cold water or the like is passed through the inner lining tube 2 through an appropriate mechanism to cool it. , the initial diameters DO and Di are expanded and contracted to DOh and Dic, respectively, as shown in FIG.

After changing the diameter in this way, heating and cooling are stopped, and when the cold water in the inner tube 2 is pressurized and the tube expansion force F is applied as shown in FIG. 3, the inner tube 1 is first expanded and the The stress shown in Figure 4,
Following the strain curve, the inner tube 2 draws curves A, C, and C, and when the inner tube 2 reaches the inner diameter DOh of the outer tube 1, it comes into contact with the outer tube 1 and expands in a polymerized state, and the outer tube 1 is expanded due to the difference in yield stress. Therefore, draw the curves of mouth' and ha2. When the tube diameter reaches the set diameter DB, the outer tube 1 is contracted from C5 to G by releasing the tube expansion force F, and the inner tube 2 is contracted from C to C2.

Therefore, in that state, that is, the diameter of the outer tube at 2 is smaller than the diameter of the inner tube at 2, and as long as that is the case, the tight clamping force acts, but there is a residual cooling state from within the inner tube 2. When the cold water is dehydrated and water is sprayed onto the outer circumferential surface of the outer tube 1 via a spray device (not shown), the inner tube 2 is heated by the liquid removal, and conversely, the outer tube 1 is wetted with liquid and cooled.

Therefore, the inner tube 2 expands from 2 to E and increases in diameter to Di', while the outer tube 1 contracts and decreases in diameter from Go to E5 to DO', resulting in a diameter difference between the two tubes. becomes extremely large as Dl'-DO'-ΔD, the bend is securely tightened, and the lining is completed.

In the above embodiment, the outer tube 1 was heated and the inner tube 2 was cooled after the insertion, but it is of course possible to heat the outer tube 1 and cool the inner tube 2 before the insertion, or to perform either heating or cooling. It can also be applied when the yield point of the outer tube is lower than that of the inner tube, and the tube expansion force,
Heating and cooling means are subject to design changes.

Next, the embodiment shown in Figs. 5 and 6 is a bellows embodiment for an expansion joint, in which the difference in diameter is used for a bellows pipe 1' of a deformed material integrally welded between flanges 3 and 3 in a predetermined manner. As shown in Fig. 5, the inner tube 2' of the lining material is inserted, and the diameter is increased and decreased through the outer tube heating and inner tube cooling processes as in the previous embodiment, respectively, and then the inner tube 2' is heated. Apply hydraulic pressure to expand the tube,
It is strained using the difference in yield stress, and the tube expansion force is released at the set strain.
The tube is contracted, and again, contrary to the thermal action described above, the inner tube is heated to increase in diameter and the outer tube is cooled to decrease in diameter as in the previous example, increasing the relative diameter difference and tightly tightening the joint surfaces, as shown in Fig. 6. Make sure to line it with the inside.

In this case, as in the previous embodiment, the heating and cooling processes before and after the insertion of the inner tube 2' into the bellows tube 1' of the outer tube may be selected, or only one of them may be adopted. The selection of cooling and heating after the release of the tube expansion force, and the combination with heating and cooling before tube expansion, etc., are free and do not preclude all of the embodiments.

Of course, it is also applicable to cases where the yield point of the bellows tube 1' is lower than that of the inner tube 2'.

The embodiment shown in FIGS. 7 and 8 is an embodiment of oil country tubular tubing, and as shown in FIG. Insert
After the relative diameter changes due to heating of the outer tube and cooling of the inner tube, the tube is expanded, and after the tube expansion force is released, the outer tube is cooled and the temperature of the inner tube is increased through the tube contraction action. The inner lining is securely tightened and fixed by repeating the steps as shown in FIG.
Thereafter, the threaded joint 4 is processed as appropriate. In this embodiment, a stepped portion of the chuping is formed on the inner surface 5, but an extremely large tightening is required to expand the relative diameter difference through the thermal deformation strain, tube expansion strain, and further thermal deformation. A certain amount of clearance is obtained, and the tightening and fixation are reliably performed. Incidentally, similar to the bellows mode described above, when cooling and heating functions are used together, it is extremely effective when used both before and after pipe expansion.

In the embodiment shown in FIGS. 9 and 10, a pipe 2' is attached to an outer plate 1"5" as a profiled member of an isothermal heat exchanger for a nuclear reactor.

This is a case in which the joints are joined together as a kind of lining at the joint 6, and it is not possible to use fixing means such as welding for the joint 6 due to the nature of the application, so the application of this invention is extremely difficult. In this embodiment, the joint portion of the pipe 2″5 is cooled to a set temperature, and the joint portion 6 of the outer plate V′7 at the natural temperature is cooled.
the pipe 2' by hydraulic expansion.
. Applying a pipe expansion force F to the pipe 2'1 to increase its diameter,
The pipe is brought into contact with the joint 6, the pipe is further expanded, compressive stress is applied to the tube plate 1''1 to increase its inner diameter, and after forming a set strain, the pipe expands force F.
By releasing the pipe, both diameters are reduced, and by increasing the diameter of the pipe 2''5, the relative minus diameter difference is expanded, and the inner lining can be reliably tightened and fixed. Of course, it is also possible to cool the heating pipe 2'1 before inserting it and after expanding the heating pipe 2'1, and the effect in that case is further enhanced.

Further, the embodiment shown in FIGS. 11 and 12 is an explanatory view of an embodiment for a high-temperature, high-pressure and pressure vessel. The upholstery 7'7 is made of stainless steel.

The seed reaction tower has a large volume and cannot be fully welded due to its shape restrictions. Therefore, the application of the present invention is also extremely effective, and Example 1 is shown in Fig. 11. As shown in the figure, the irregular shaped material 1"'5 is assembled into a set by enclosing the lining material 2"'5 on the outside of the lining material 2"'5 welded to a predetermined shape, and the lining material 2"'5 is assembled into a set. Cooling water is introduced into the deformed material 1'''5 through the seal/water guiding mechanism 7 as appropriate.
Blowing hot air on the outside surface increases the gap between questions. Then,
Apply pressure F to the cooling water to expand the lining material 2'''1 and attach it to the inner surface of the irregularly shaped material V''5, and after further expansion, release the applied pressure and drain the cooling water to bring it to room temperature. The 12th
It can be tightened and fixed as shown in the figure.

In this embodiment, the deformed material 1"'5 can sufficiently satisfy the strength, and the lining material 2"'5 can sufficiently satisfy the corrosion resistance, airtightness, etc.In addition, in this embodiment, the inside of the cryogenic liquefied gas storage tank can be fully satisfied. This can also be applied to Zhang.

It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments, and various types of lining equipment and piping are possible, including heating, cooling, and expanding pipes. As described above, according to the present invention, a lining material can be applied to oil pipe bends, telescopic pipe bellows, oil country tubular tubing, heat exchanger shell joints, or closed inner surfaces of irregularly shaped materials such as high-pressure vessels. In the attaching and fixing method, before installing the lining material against the inner surface of the closure,
Alternatively, after installation, the irregular shaped material is selectively heated and the lining material is selectively cooled in an independent event, and then the lining material is expanded plastically and strained and deformed integrally with the irregular shaped material to expand. By releasing the force, when the lining material is contracted, the profiled material forms a negative contraction relative to the lining material, and a sufficient interference can be formed primarily. } After further shrinking, the profiled material and the lining material undergo thermal contraction and thermal expansion independently, so that a relative negative reduction is taken into account in the secondary shrinkage, and therefore sufficient tightening is achieved. This provides an excellent effect in that it is possible to reliably fasten even the irregularly shaped materials for which it is difficult to obtain a tightness of joint compared to general joints such as double pipes.

Furthermore, according to the present invention, even in the case of a combination in which the yield point of the deformed material is lower than that of the lining material, the setting is securely fastened, so that equipment piping and configurations such as plants, piping, pressure vessels, etc. There is no longer a concern with the selection of materials, etc. Therefore, each profiled material is reliably lined, and excellent effects such as buckling and fatigue failure are achieved even under operating pressure, temperature, and operation of corrosive fluids. be done.

Furthermore, this can be done before and after expansion depending on the heating temperature and cooling conditions, so there is an advantage that the degree of freedom in joining conditions is extremely large. In addition, there is the advantage that the work is easy because the gap between the joints can be freely created when the lining material is installed.

[Brief explanation of the drawing]

The drawings show embodiments of the invention, and include first, second, and third embodiments.
Figure 3 is an explanatory diagram of the lining process of one embodiment, Figure 4 is an explanatory diagram of the relationship between the diameter of the inner and outer tubes and stress, Figures 5 and 6 are illustrations of the lining process of other embodiments, and Figures 7 and 8 are diagrams of the lining process of other embodiments. FIGS. 9 and 10 are diagrams explaining the lining process of another embodiment. FIGS. 11 and 12 are diagrams explaining the lining process of another embodiment. 1, 1', 1", 1"', 1""...Deformed material,
2, 2', 2", 2"', 2"". ．． ．． ．． ．． ．． Lining material.

Claims (1)

[Claims] 1 In a lining method in which a lining material is attached and fixed to the closed inner surface of a deformed material, the lining material is placed opposite to the closed inner surface of the deformed material, and the deformed material and the lining material are attached either before or after that. After increasing the opposing gap by applying a relative temperature difference between the two, and applying an expansion force to the attached lining material to plastically expand the lining material and bring it into close contact with the inner surface of the irregularly shaped material, the above-mentioned A method for lining a deformed material, characterized in that the deformed material and the lining material are provided with a relative temperature difference opposite to that described above, and the deformed material and the lining material are tightly fastened for lining.