JPH06117597A - Method of maintaining pipe line - Google Patents

Abstract

PURPOSE:To use a pipe line in which a plurality of pipes are connected by joints, for a long time by turning pipes at suitable time intervals (every time when the wall thickness of the bottom part of a pipe is decreased by a predetermined value) so that the bottoms of the pipes are shifted upward. CONSTITUTION:In a pipe line in which hard vinyl chloride resin pipes 1, 1 are connected together by means of a hard vinyl chloride joint 2, at a stage such that the wall thickness of the bottom of the pipe a is more or less decreased by a fluid passing through the pipe line for a long time, A blind nut 23 on the joint 2 is loosened so as turn the pipes 1, 1 by an angle of 180deg. Accordingly, the bottom of each of the pipes 1 whose wall thickness is decreased, is located right above, and in this condition, the blind nut 23 is fastened to for refixing the pipes 1, 1. Accordingly, the pipe line can be used for a long time, and accordingly, this process is cheaper than the conventional process in which pipes are replaced with new ones.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for maintaining and maintaining piping in a chemical plant or the like.

[0002]

2. Description of the Related Art Conventionally, in piping in a chemical plant or the like, a hard vinyl chloride resin pipe, a polyethylene resin pipe,
Lining steel pipes, FRP pipes, etc. are used. In pipes in chemical plants, etc., compared to water pipes, drain pipes, etc., it is used under severe conditions such as when the fluid flowing in the pipe is strongly acidic or alkaline, or when the fluid is at high temperature and high pressure. In many cases, corrosion or deterioration such as reduction in wall thickness of the pipe wall is likely to occur. Further, the fluid may contain a large amount of scale, and the thickness of the tube wall may be reduced due to abrasion by the scale.

In such a pipe, when the fluid flows in the pipe without being filled with the fluid, only the portion in contact with the fluid, that is, the bottom portion of the pipe has an extremely thin wall thickness. , An accident such as fluid leakage will occur. Therefore, the tube is replaced when the thickness of the bottom wall of the tube is reduced to some extent.

[0004]

However, when the thickness of the bottom wall of the pipe is reduced to some extent in this way, the pipe is replaced because the pipe is almost unchanged except for the bottom. Will be replaced entirely, which is not economical.

The present invention has been made by paying attention to such a conventional problem, and its purpose is to:
It is an object of the present invention to solve the above problems and provide a method for maintaining and maintaining a pipe that does not require replacement of the entire pipe even when the thickness of the bottom wall of the pipe is reduced to some extent.

[0006]

In order to achieve the above object, a method of maintaining and maintaining a pipe according to the present invention is to rotate a pipe at a proper time in a pipe in which a plurality of pipes are connected by a joint. Thus, the bottom of the pipe is moved upward from the lowermost position.

In the method of the present invention, the proper time for rotating the tube depends on the material of the tube and the nature of the fluid flowing in the tube, but it is the time when the thickness of the bottom wall of the tube is reduced to some extent. Thus, it is desirable to rotate the tube periodically.

Further, in the method of the present invention, it is desirable that the pipes are connected by a joint that allows the pipes to be easily rotated so that the pipes do not have to be detached from the pipes in order to rotate the pipes.

In the method of the present invention, the degree of rotation of the pipe is such that when the amount of fluid in the pipe is large, the pipe is rotated about 180 degrees so that the bottom of the pipe is directly above. It is necessary to rotate the pipe, and when the amount of fluid in the pipe is small, the pipe may be rotated by about 90 degrees so that the bottom of the pipe is located just beside.

[0010]

According to the pipe maintenance and maintenance method of the present invention, in a pipe in which a plurality of pipes are connected by a joint, the bottom of the pipe is moved upward from the lowermost position by rotating the pipe at an appropriate time. Therefore, the pipe can be used for a long period of time by rotating the pipe when the thickness of the bottom wall of the pipe is reduced to some extent, and it is much more economical than the conventional method of replacing the whole pipe. .

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an enlarged sectional view showing a part of a pipe for carrying out the method of the present invention.

In FIG. 1, 1 and 1 are hard vinyl chloride resin pipes and 2 is a hard vinyl chloride resin joint. The joint 2 includes a flanged socket 21, a male screw socket 22 and a cap nut 23. An inner collar 231 of the cap nut 23 is locked to the flange 211 of the flange socket 21, and the cap nut 23 is attached to the male thread of the male screw socket 22. The flanged receptacle 21 and the male threaded receptacle 22 are connected by being screwed. An annular groove 221 is formed in the boundary surface of the male screw receiving opening 22 and the flanged receiving opening 21, and the PVDF O-ring 22 is formed in the annular groove 221.
2 is fitted.

The ends of one pipe 1 are inserted and adhered into the flanged receiving port 21 of the joint 2, and the ends of the other pipe 1 are inserted and adhered into the male screw receiving port 22 of the joint 2 so that both pipes are connected. 1, 1 are connected to form a conduit.

As shown in FIG. 2 (a), when the thickness of the bottom wall of the pipe 1 is reduced to a certain extent as a result of the fluid flowing in the pipe line in such a state for a long time, the bag of the joint 2 is closed. Loosen the nut 23 and rotate the pipes 1 and 1 by 180 degrees as shown by the arrow so that the bottom portion of the pipe 1 whose thickness is reduced is located right above as shown in FIG. 2 (b). To do. In this state, the cap nut 23 is tightened to fix the pipes 1 and 1 for use. In FIG. 2, 3 is a fluid flowing in the pipe 1.

FIG. 3 is an O-ring 22 of the joint 2 shown in FIG.
2 shows an example in which a packing 223 having a W-shaped cross section is used instead of the packing nut 223. When the packing 223 having a W-shaped cross section is used, as described above, the cap nut of the joint 2 is It is possible to reduce fluid leakage from the inside of the pipes 1 and 1 when the pipes 1 and 1 are rotated by loosening the pipe 23.

As shown in FIG. 4, arrow marks 212 and 223 are provided on the flanged receiving port 21 and the male screw receiving port 22 of the joint 2, respectively, and with this as a reference, the flanged receiving port 21 is provided with an angle scale 213. The tube 1 can be rotated at a desired angle.

FIG. 5 shows another aspect of piping. In the piping shown in FIG. 5, a pipe 1a which is vertically piped is connected to a pipe 1 which is horizontally piped through an elbow joint 2a. When the thickness of the bottom wall of the pipe 1 is reduced to some extent, the cap nut 23a of the joint 2a is loosened to rotate the pipe 1 and the male threaded receptacle 21a to move the bottom of the pipe 1 upward.

FIG. 6 shows the pipe 1 so that the pipe 1 can be easily rotated.
An example is shown in which the handle 3 is attached to the. In FIG.
Instead of attaching the handle 3 to the tube 1 as shown in
Shows an example in which is attached to the flanged receiving port 21b of the joint 2b.

As a means for attaching the grips 3 and 3b to the pipe 1 and the joint 2b, they may be adhered by using an adhesive or fixed by a band or the like. FIG. 8 shows an example in which a flanged flange joint 21c is used instead of the flanged socket 21 of FIG. 1, and in this case, a pipe having a flange 11c at one end is formed on the flange 211c of the flanged flange joint 21c. By connecting the flange 11c of 1c, the pipe 1 and the pipe 1c are connected. Also in this case, the cap nut 2 of the joint 2c is provided at a stage where the thickness of the bottom portions of the pipe 1 and the pipe 1c is reduced to some extent.
Loosen 3c and rotate the tubes 1 and 1c to move the bottoms of the tubes 1 and 1c upward.

FIG. 9 shows a mode in which the pipe 1 is supported by the support 4 when the unsupported span of the pipe 1 is long. The inner diameter of the support pipe 41 of the support 4 is slightly smaller than the outer diameter of the pipe 1. By increasing the size, the tube 1 can be easily rotated. In addition, 42 is a stainless protective tube for protecting the support tube 41 made of 4 hard vinyl chloride resin, and 43 is a stainless base of the support 4.

FIG. 10 shows another example of piping.
In this example, the pipe of the small-diameter pipe 1e is provided above the pipe of the large-diameter pipe 1d in the lower stage. In the pipe of the large diameter pipe 1d in the lower stage, a handle 3 is attached to the middle of the pipe 1d so that the pipe 1d can be easily rotated, and the pipes 1d and 1d are connected by a T-shaped joint 2d. Pipe 1 for T-joint 2d
An angle scale 213 is displayed so that the turning angle of d can be seen.

The lower end of the vertical pipe 1f is connected to the rising branch pipe 21d of the T-joint 2d, and the upper end of the vertical pipe 1f is connected to the hanging branch pipe 21e of the T-joint 2e of the upper stage pipe.
The T-shaped joint 2e of the upper pipe is provided with a handle 3e so that the T-shaped joint 2e can be easily rotated. The pipe 1e is connected via the T-shaped joint 2e of the upper stage pipe, and the midway portion of the pipe 1e is supported by the support 4e hanging from the ceiling 5,
The other end of e is connected to one end of the elbow joint 2f, and the other end of the elbow joint 2f is connected to the vertical pipe 1f. The elbow joint 2f is provided with a handle 3f.

In the pipe shown in FIG. 10, when the thickness of the bottom portion of the large diameter pipe 1d in the lower stage is reduced to some extent, the cap nut 23d of the joint 2d is loosened and the handle 3 is used to pipe 1d, Rotate 1d to move the bottom of the tubes 1d, 1d upward. The rotation angle can be known by the angle scale 213 of the joint 2d. Also, when the thickness of the bottom wall of the upper pipe 1e has decreased to some extent, the cap nut 23e of the joint 2e is loosened, and the pipe 1e is rotated using the handle 3e to move the bottom of the pipe 1e upward. To move.

[0024]

In the method for maintaining and maintaining a pipe according to the present invention, in a pipe in which a plurality of pipes are connected by a joint, the pipe is rotated at an appropriate time so that the bottom of the pipe is moved upward from the lowermost position. Since the pipe is moved to the bottom, the pipe can be used for a long period of time by rotating the pipe when the thickness of the bottom of the pipe has decreased to a certain extent, and it is much more economical than the conventional method of replacing the whole pipe. Target.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of an essential part showing a part of a pipe for carrying out the method of the present invention.

FIG. 2A is a cross-sectional view showing a state where the thickness of the bottom wall of the pipe is reduced, and FIG. 2B is a cross-sectional view showing a state where the pipe is rotated.

FIG. 3 is an enlarged cross-sectional view of a main part showing a part of the pipe.

FIG. 4 is an enlarged cross-sectional view of a main part of another example of piping.

FIG. 5 is a front view showing a part of another example of piping.

FIG. 6 (a) is a front view showing a part of another example of piping,
(B) is the sectional view.

FIG. 7 is a front view showing a part of another example of piping.

FIG. 8 is a cross-sectional view showing an enlarged part of another example of piping.

FIG. 9A is a front view of a main part cutaway showing an enlarged view of a part of another piping example, and FIG.

FIG. 10 is a front view of another example of piping.

[Explanation of symbols]

 1, 1c, 1d, 1e, 1f Pipe 2, 2c, 2d, 2e, 2f Joint 23 Cap nut 3, 3b Handle

Claims (1)

[Claims] 1. Maintenance and maintenance of a pipe, characterized in that, in a pipe in which a plurality of pipes are connected by a joint, the bottom of the pipe is moved upward from the lowermost position by rotating the pipes at an appropriate time. Method.