JPS58107324A - Coating structure of surface of member - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The disclosed technology belongs to the technical field of applying a coating material such as a corrosion-resistant liner to the surface of a member such as a corrosive fluid transport pipe.

Therefore, the invention of this application relates to a member surface coating structure in which a corrosion-resistant coating is attached in an unbonded state to a base member such as a pressure-resistant and heat-resistant outer pipe of the transport pipe, and in particular, to a base member such as a pressure-resistant and heat-resistant outer pipe of the transport pipe. A coating material is attached via a large number of micro spacers so that the space between the coating material and the base member is a closed space, and the entire space is communicated with the vacuum device, which is connected to a vacuum device and operated at all times. It is maintained in a vacuum state by means such as a vacuum cleaner, and the attachment of the sheathing material is maintained by the differential pressure between the inside and outside of the sheathing material, and it is further connected to a leak detection device to immediately detect leaks from the sheathing material during operation. This invention relates to a structure for covering the surface of a member.

As is well known, transport pipes and containers are used to transport and store corrosive fluids, but it goes without saying that they must have corrosion resistance and abrasion resistance in addition to pressure and heat resistance. be.

Therefore, in general, the structures of these transport pipes and containers are made of base materials such as carbon steel for pressure resistance and heat resistance, and stainless steel for corrosion resistance, abrasion resistance, etc. It is lined with a covering material such as.

Conventional coating structures often involve bonding the coating material to the base member in the same phase, overlaying the coating material, or by thermal spraying, but because they are metallurgically bonded, they have the disadvantage of cracking, peeling, etc. It also had the disadvantage of poor durability, and in addition, it had the disadvantage of high costs due to the considerable thickness of the expensive covering material.

Furthermore, once the product is in operation, defects such as buckling occur, causing leaks in the covering material.For example, even if so-called debonding occurs in the cladding material, the leakage cannot be detected and unforeseen situations can occur. There was an inconvenience that beckoned.

The purpose of the invention of this application is to solve the problems that exist in the structure for attaching the coating material to the base member based on the above-mentioned prior art, and to interconnect the coating material to the base member through a large number of micro spacers. A closed space is attached to the outside of the system, and this space is maintained in a vacuum state and connected to a leak detection device, thereby preventing the transportation or storage of corrosive fluids such as atomic couplants. 1q beneficial to the industrial application field of
The purpose is to provide an excellent member surface coating structure.

The structure of the invention of this application in accordance with the above-mentioned object is to attach a covering member to a base member integrally with at least one of them or through a large number of other micro spacers, and to connect the base member and the covering member. The air temperature formed during the process is made into a closed space, and all of the closed spaces are brought into communication, and the above-mentioned problem is solved by taking means to connect the closed space to a vacuum device and further to a leak detection device. By solving this problem, the closed space is always evacuated by the vacuum device when the member is in operation, and the coating material is attached to the base member by the differential pressure between the inside and outside of the coating material, and the material is accidentally attached to the I material. The gist of the present invention is that when a defect occurs, leak detection is immediately performed by the detection device.

Next, one embodiment of the invention of this application will be described below based on the drawings.

The illustrated embodiment is a mode of transportation piping for corrosive waste liquid such as an atomic couplant. For example, a stainless steel sheathing material 2 is suitably provided with a large number of full-gate micro spacers 3, 3 to the inside of a base member 1 made of an outer tube made of carbon steel. . . are integrally molded in a protruding manner, seam welded 4 in the longitudinal direction to form an inner tube, and inserted to form a unit tube 5.

Therefore, in the unit tube 5, the inner tube 2 has a large number of spacers 3. A closed space 6 is provided between the back surface of the inner tube 2 and the crotch portion and the surface (inner surface) of the outer tube 1.
are formed as a whole in a communicating state and are connected to a vacuum boat 7 bored in the outer tube 1.

Since the spacers 3, 3, .

Reference numeral 8 denotes a ring-shaped coupling, which is screwed and tightly connected to the male thread 9.9 of the outer pipe 1.1 of the unit pipe 5.5, which has opposite threads to each other. and is sealed by O-rings 10, 10...

When connecting the unit tubes 5.5, a seal ring 12 is interposed on the flange portion 11.111 of the bent tube end 7 of the inner tube 2, and the coupling 8 is tightly connected.

In this case, a communication hole 13 extending longitudinally through the interior of the coupling 8 is communicated with a communication groove 14 provided in an annular manner on the inner surface of both sides, and the communication groove 14 is connected to the pipe of each unit pipe 5.5. It communicates with a vacuum boat 15.15 which is bored and connected to the closed space 6.6 at the end.

Further, 16 is a vacuum device with a built-in vacuum pump of small capacity, and the outer tube 1 is connected to the outer tube 1 by a pipe 18 via an electromagnetic valve 11.
It is connected to the nipple 19 of the vacuum boat 7.

A vacuum gauge 22 as a leak detection device having an alarm bell 20 and a lamp 21 is connected to the pipe 18 .

The above-mentioned nipple 19 may be provided in each unit pipe 5, but in practice, only one nipple is required per pipeline, and it is connected to the vacuum device t16, and the nipples 19 of other unit pipes 5 are blind plugged. You can also do it.

In the above configuration, the unit pipes 5.5... are connected by couplings 8.8... to form a pipeline, and the vacuum device 16 is operated during and during operation.

As a result, the closed space 6 of each unit pipe 5.5...
．． 6... is a communication path 13. of coupling 8.8...
13..., vacuum ports 15. Since all the closed spaces are evacuated, the inner tubes 2.
Due to the internal and external differential pressure of 2 ..., the internal pipe 2.2 ... is strongly attached to the outer pipe 1 via Nebesa 3.3 ....

Therefore, the splice is maintained during operation, but when the negative pressure reaches a certain level, the negative pressure is maintained. O
If you turn it off, the power consumption will be extremely small.

Furthermore, if the coupling portion is completely sealed, it is possible to create a structure in which the gap between the electromagnetic pulp 11 and the vacuum pump 16 can be removed, thereby eliminating the need for a vacuum pump.

It is operated in this manner to flow and transport corrosive waste liquid, but if a crack or the like unexpectedly occurs in the inner tube 2 during operation, the vacuum gauge 22 immediately increases the pressure, sounds the alarm bell 20, and warns the user. Turn on the lamp 21.

Therefore, the vacuum pump of the vacuum device 16 is in continuous operation.

Therefore, predetermined repair work can be carried out.

It goes without saying that the embodiments of the invention of this application are not limited to the above-mentioned embodiments. For example, a leak detection device may be omitted, and unit pipes may be used in atomic couplet piping with a high degree of danger in a plant. A vacuum device and a leak detection device may be provided for each container, and numerous embodiments can be adopted, such as being applicable to a container and also being used as a side wall panel.

As described above, according to the invention of this application, the coating material for the base member of a pipe or container for transporting or storing a corrosive fluid is attached via a large number of micro spacers, and the space between the two is removed from the system. By communicating with each other as a closed space and connecting it to a normally operating vacuum device, the material to be coated is firmly attached to the base member due to the differential pressure between the front and rear surfaces of the coating material, and therefore, coating is easy. Not only does it provide excellent effects at a low cost, but it also provides an effect that does not cause phenomena such as peeling.

In addition, since the closed space between the base member and the covering material is evacuated by the constantly operating vacuum pumping device, there is a possibility that the covering material may be unexpectedly damaged during operation and gas etc. may leak into the closed space. Even if the vacuum pressure in the closed space fluctuates, there is an excellent effect in that the leak detection device detects leakage.

Since maintaining the vacuum in the closed space can reduce the normal operating capacity of the vacuum device, a vacuum pump or the like may have a small capacity, which also has the effect of reducing power costs.

Furthermore, the cladding material for the base member may have a special metallurgical bond,
It has the advantage of being easy to attach because it does not require a strong four-joint connection.

[Brief explanation of drawings]

The drawing is an explanatory diagram of one embodiment of the invention of this application, and the drawing is a first embodiment of the invention of this application.
The figure is an explanatory perspective view, FIG. 2 is an explanatory cross-sectional view, and FIG. 3 is an explanatory partial longitudinal cross-sectional view.

Claims (2)

[Claims] (1) In a member surface coating structure in which a coating material is attached to the surface of a base member, the coating material is attached to the base member through a large number of micro spacers, and the back surface of the coating material and the surface of the base member 1. A member surface covering structure characterized in that a space between and a closed space is connected to a normally operating vacuum chamber. (2) In a member surface coating structure in which a coating material is attached to the surface of an airframe member, the coating material is attached to the base member through a large number of micro spacers, and the back surface of the coating material and the surface of the base member A structure for covering a surface of a member, characterized in that the space is a closed space, and the closed space is connected to a constantly operating vacuum device and also to a leak detection device.