JPH01118309A - Corrosion resistant, abrasion resistant multi-layer pipes of segments and its manufacture - Google Patents

Abstract

PURPOSE:To continuously form multi-layer pipes of segments having pressure tightness, corrosion-resistance and wear and abrasion resistance each by tightly bonding a corrosion-resistant intermediate pipe and a pressure resistant outer pipe with segment pipes made of an abrasion resistant inner pipe. CONSTITUTION:Ceramic segments having a prescribed shape each are arranged in the axial direction to obtained a pipe body as the inner pipe 7. Then, a double pipe obtained when a thin-wall 'Incoloy(R)' intermediate pipe 2 is tightly bonded with an outer pipe 1 of carbon steel is put on the outside of the inner pipe 7 to form a raw pipe 3. Then, a high frequency induction heating device 4 is set annularly to the raw pipe 3 and cooling devices 5, 5 such as a shower head, etc., are set annularly before and behind this heating device to form one block and so that they can move freely at a prescribed speed in the axial direction to the raw pipe 3. The annular heating device 4 is electrified to heat the pipe and water is showered from the annular cooling devices 5, 5 to cool the pipe and the devices are moved to the raw pipe 3 at a prescribed speed in the axial direction. The annular heating and the annular cooling are repeated in the axial direction and the devices are moved to tighten the outer pipe 1 and the intermediate pipe 2 to the inner pipe 7.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The disclosed technology belongs to the technical field of the structure of corrosion-resistant and wear-resistant piping and its manufacture.

<Summary of the gist> The invention of this application has a wear-resistant inner tube as the inner tube, a pressure-resistant outer tube as the outer tube, and a corrosion-resistant inner tube interposed between the inner tube and the outer tube. In particular, the invention relates to a double-walled pipe, in which the inner pipe is a block-shaped segment made of ceramics or chrome cast steel, and the segment is connected to an outer pipe made of carbon steel, etc. through a corrosion-resistant inner pipe made of Incoloy or Hastelloy. This invention relates to a corrosion-resistant and wear-resistant double pipe that is joined by a method of elegant diameter reduction such as annular heating and annular cooling, and a method for manufacturing the same.

<Prior Art> As is well known, piping is used not only for its primitive purpose of transporting fluids, but also in recent years as beam materials for structures and equipment, and even as a means of transmitting information. .

Therefore, the type of piping is not only strong enough to hold the pipe body, but also
In order to maintain functionality over time, we provide corrosion and abrasion resistance, as well as
Pressure resistance, heat resistance, etc. are also required, and therefore, in current materials science, no technology has emerged that satisfies all of these required performances with a single material. W of double pipes, etc. controlled by each material
Heavy pipes have been developed.

In recent years, there has been a strong demand for slurry transport pipes installed in plants in the heavy and chemical industries that are not only pressure resistant, but also have corrosion and abrasion resistance. A double pipe with these combined functions has not yet been developed, and its development has been strongly desired.

<Objective of the Invention> The object of the invention of this application is to ensure that the invention has multiple functions based on the above-mentioned prior art, and to be able to fully demonstrate the original functions of piping, thereby benefiting the fields in which piping technology is used in various industries. The object of the present invention is to provide a double pipe with excellent corrosion resistance and wear resistance, and a method for manufacturing the same.

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of the invention of this application, which is based on the scope of the above-mentioned patent claims, is to solve the above-mentioned problem. The inner tube is formed by segments made of materials that have high strength and wear resistance such as ceramics or chrome cast steel, and furthermore, a middle tube with high corrosion resistance made of Incoloy or Hastelloy is placed on the outside of the inner tube. The outer tube on the outside is surrounded by a pressure-resistant tube material such as carbon steel, and an annular heating device is set on the outside of the outer tube and an annular cooling device is set at least in the rear before and after the annular heating tube. By moving the heating and annular cooling relative to each other in the axial direction, the expansion diameter of the outer tube due to annular heating is prevented by annular cooling, and the outer tube is plastically deformed through a decrease in strength due to annular heating. A technical measure has been taken in which the middle pipe is brought into contact with the inner pipe of the segment to create a double pipe in a securely fastened state as a whole.

<Embodiments> Next, embodiments of the invention of this application will be described below with reference to the drawings.

First, an embodiment of the principle aspect will be explained with reference to the drawings from FIG. 4 onwards. First, as shown in FIG. As shown in FIG. 5 for the raw tube 3, a high-frequency induction heating bag @ 4 or the like is provided in a ring shape at a predetermined portion of the outer tube 1, and a cooling bag such as a shower ring or the like is installed by passing water in the front and back of the axial direction. @ 5.5 is similarly provided in a ring shape, and a single-volume heating device 4 and an annular cooling device 5.5 before and after it are set, and as shown by the arrow, the raw tube 3
, the annular heating device 4, and the annular cooling device 5.5 are moved relative to each other in the axial direction at a predetermined speed.

In this case, if the outer tube 1 is in the shape of a cylindrical ring and its front and rear ends are free ends, the annular heating device 4 attempts to expand the diameter, but the annular cooling device 5.5 cools the outer tube 1 at the front and rear ends. The expansion diameter is prevented because the ring is restrained by the annular heating device 4, and the strength is reduced by the annular heating device 4, resulting in plastic deformation.
Moreover, as shown in FIG. 7, the annular cooling bag @5 exerts a presser bending moment F, so that it yields and comes into contact with the inner tube member 2 and is tightened.

Since the annular heating device 4 and the annular cooling device 5.5 move relative to the raw tube 3 in the axial direction at a predetermined speed, the annular heating and the annular cooling extend to the raw tube 3. Therefore, the outer tube material 1 is completely tied to the inner tube material 2, and a tied tube 6 is formed as shown in FIG.

In this case, an annular heating device 4 and an annular cooling device 5.
5 is moved forward and backward repeatedly in the axial direction, the tightening is further promoted, and thereby the tightening is achieved even if a thin inner tube is inserted between the outer tube 1 and the inner tube 2. Served.

Furthermore, the tightness is achieved regardless of the thickness or type of the outer tube material 1.

Therefore, although the principle embodiment (a) above is for a double pipe, as mentioned above, it is possible to use a double pipe or more in which another thin inner pipe material is interposed between the outer pipe material 1 and the inner pipe material 2. Of course, tightness also appears in double pipes.

Therefore, the first to third embodiments are based on the embodiments of the above-mentioned principles.
To explain with the drawings, in the embodiment shown in Fig. 1.2, numeral 8 is a corrosion-resistant and wear-resistant triple pipe as a double pipe, which is one of the gist of the invention of this application, and the inner pipe 7 is made of ceramics. The outer tube 1 is made of carbon steel and has pressure resistance, and the outer tube 1 and the inner tube 7 are connected to each other.
An intermediate tube 2 made of Incoloy with a predetermined thin wall thickness is interposed between the inner tube 7 and the outer tube 1 to provide corrosion resistance.
, and the middle pipe 2 are connected to each other, and are used as slurry transport pipes in heavy and chemical industry plants. The function of the heavy pipe 8 is fully guaranteed over time.

Since the slurry is also a corrosive fluid, there is a possibility that the outer tube 1 will be corroded if a leak occurs from the minute clearance between the ceramic segments. Since it is interposed, its corrosion resistance is fully guaranteed.

When manufacturing the double tube 8, segments of a predetermined shape are arranged in a predetermined manner in the axial direction using ceramics to form a tube body to form the inner tube 7, and a predetermined thin-walled incoloy is placed on the outside of the inner tube 7. The tube 2 is relatively layered on a double tube that is tightly connected to the outer tube 1 made of carbon steel by, for example, a hydraulic tube expansion method, and then the blank tube 3 is formed.
In accordance with the above-mentioned principle, as shown in FIG. 1, a high frequency = i heating device 4 and the like are set in a ring shape, and a cooling device 5 such as a shower ring using tap water is also set in a ring shape before and after it. , annular heating device 4, annular cooling device 5.
5 is made into one block as a whole, and is set so as to be relatively movable in the axial direction with respect to the raw pipe 3 at a predetermined speed using a predetermined device.

Then, the annular heating device 4 is energized to heat it, and is cooled by showering water from the annular cooling device 5.5, and is moved relative to the raw pipe 3 in the axial direction at a predetermined speed.

By doing this, in the same way as shown in the principle mode shown in FIG. Through a decrease in strength, the presser bending moment acts in the same manner as shown in Fig. 7, resulting in plastic deformation, and finally yields and abuts against the outer surface of each segment of the inner tube 7 via the middle tube 2 and is tightened. be done.

In this case, since the inner tube 2 similar to that described above has a thin wall, it is securely connected to the segments through the presser bending moment in the outer tube 1.

Then, by repeating the annular heating and annular cooling in the axial direction and relatively moving back and forth, the outer tube 1 and the inner tube 2
The inner tube 7 is more securely fastened to the ceramic segment.

In the embodiment shown in FIG. 3, a suitable industrial adhesive 9 is applied between the ceramic segments, and also applied between the inner tube 2 and between the inner tube 2 and the outer tube 1. This is an embodiment in which an industrial adhesive 9 is also interposed between the tubes, thereby making it possible to prevent relative displacement of the outer tube.

It should be noted that the embodiments of the invention of this application are of course not limited to the above-mentioned embodiments. For example, the segments of the inner tube may be made of chrome cast steel as well as ceramics, and the segments of the inner tube may be made of chrome cast steel. In addition to Incoloy, for example, Hastelloy may be used, and even resin may be used.

Moreover, it goes without saying that the present invention is applicable not only to triple pipes but also to quadruple pipes or more.

<Effects of the Invention> As described above, according to the invention of this application, transport of slurry, etc. is basically achieved by making the inner pipe into wear-resistant segments made of ceramics, chrome cast steel, etc. in a double-layered pipe such as a triple-layered pipe. Not only does the piping have excellent abrasion resistance, but by interposing an inner pipe made of Incoloy or Hastelloy with excellent corrosion resistance between the outer pipe, which has pressure resistance, etc., the piping has not only excellent pressure resistance, but also corrosion resistance. It can also provide wear resistance and wear resistance.
It has an excellent effect in that it can be used for transporting corrosive and abrasive fluids in plants and the like.

In addition, even if corrosive fluid leaks from the joints of ceramic segments, the inner tube is made of corrosion-resistant Incoroiya Hastelloy, which has the excellent effect of not corroding the outer tube. be done.

Therefore, when the outer tube is bonded to the outside of the ceramic segment etc. via the inner tube in the production of double tubes, annular heating is applied to the core outer tube and annular cooling is applied to at least the rear portion before and after the inner tube. By relatively moving the outer tube in the axial direction, the diameter of the outer tube is prevented from increasing together with the inner tube, and the outer tube is plastically deformed due to a decrease in strength due to heating, and is then yielded due to the presser bending moment, ensuring that the inner tube is fully exposed to the outer surface of the segment of the inner tube. Qin has the excellent effect of being able to bind together.

By doing so, the double pipes of the inner pipe and the outer pipe having the segments as the inner pipes are tightly connected and can function reliably as piping.

[Brief explanation of the drawing]

1 to 3 are detailed explanatory views of the invention of this application, in which FIG. 1 is a longitudinal sectional view of one embodiment, FIG. 2 is a cutaway perspective view of the same part, and FIG. 3 is a diagram of another embodiment. The partially cutaway perspective view and FIGS. 4 to 7 are sectional views of the principle mode. 7... Inner tube, 1... Outer tube, 2... Middle tube,
8...Double pipe, 7...Segment pipe, 4...
Annular heating device, 5... Annular cooling device Fig. 2 Fig. 3

Claims (2)

[Claims] (1) In a double pipe in which the inner pipe is a wear-resistant pipe, the outer pipe is a pressure-resistant pipe, and a corrosion-resistant middle pipe is interposed between the two pipes, the wear-resistant inner pipe is a segment pipe, and the segment pipe is A corrosion-resistant and wear-resistant double-walled pipe, characterized in that the above-mentioned corrosion-resistant inner pipe and pressure-resistant outer pipe are tightly connected. (2) In a method for manufacturing a double pipe in which a pressure-resistant outer pipe is tightly connected to a wear-resistant inner pipe via a corrosion-resistant middle pipe, the wear-resistant segment inner pipe and the pressure-resistant outer pipe are connected to the corrosion-resistant middle pipe. and then applying annular heating to the pressure-resistant outer tube and annular cooling at least at the rear portion before and after the annular heating through relative axial movement, thereby forming the pressure-resistant outer tube into a corrosion-resistant inner tube. 1. A method for manufacturing a corrosion-resistant and wear-resistant double pipe, characterized in that the pipe is tightly connected to a wear-resistant inner pipe through a pipe.