JPS58121388A - Method and apparatus for preventing corrosion of inner wall of pipe - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for preventing corrosion and scale formation on the inner wall of a pipe such as a steel pipe.

Steel pipes and other metal pipes are used for various purposes in all industrial fields, but the inner wall g of these σ)'#
The occurrence of IIM and scale poses various problems for each industry.

For example, when transporting factory water using a steel pipe with a diameter of 200mm and a length of 1*000m, the monthly electricity bill required is approximately 90,000 yen (calculated based on an IKW of 16 yen).
However, if nine scales of scale adhere to the inner walls of the pipes that make up this conduit, the electricity bill will increase to about 1.2 million yen per month, which is extremely uneconomical.

Furthermore, in the chemical industry, the inner walls of pipes for waste liquid treatment are severely corroded, and the entire pipe must be replaced once every two years.

As a method of preventing g#A on the inner wall of the tube, it has been conventionally practiced to remove the WkK-coated eel inside the tube within a limited range. This method involves inserting a nozzle connected to the paint tank into the pipe, spraying the paint, and then pulling it.
It is equipped with h. However, with this method, the length of the tube that can be painted is at most limited by the application of electricity, and there is also the disadvantage that it cannot be used (unusable) if it gets stuck in a bent tube.Also, when the coating is placed using this method, the inside of the tube 411 The evaporation of the #I@ in the painted m class will cause pinholes in the booster armor, and water will enter through these pinholes and corrode the gold in the tube, m*. ,
The durability of the pipes is limited and cannot withstand the pressure of the river for many years. Furthermore, tubes with such 1!1 fittings are designated as #m class.
It cannot be used to deliver drugs or other chemical products that have the property of anaerobic oxidation, and it has low heat resistance, so there are limits to its useful range. Also, in some cases, the i5 method for cathodic protection by inserting an anode grate into the pipe, and the A'1 method, in which the inner wall of the pipe is lined with synthetic rubber, vinyl chloride, etc., are also used.

All of these methods have problems such as difficulty in implementation, high cost, and strict maintenance during implementation, and these methods are only used in a limited range.

This invention solves the problem that could not be solved by conventional corrosion prevention methods on FI2 using an extremely simple method.

It can be applied to all types of pipes, including large electrical circuits, bent or crooked pipes, and pipes with four differences. The purpose of the present invention is to provide a method for preventing corrosion of the inner wall of a pipe that can withstand the use of l!IiMFfJ.

In this invention method V, one end of the V-shaped synthetic resin film is
Attach it to the big tube, and let it be semen inside this big tube.
The air between the film and the inner wall of the pipe is exhausted by running the VIG into the film placed inside the pipe.
The purpose is to form a koji film that protects the inner wall of the tube by bonding the Nefilm to the inner wall of the tube.

Further, the device of the present invention includes a VIG equipped with a tubular synthetic side fat film attachment means at the rear end, a VIG launch tube equipped with a pressure water inlet for pumping VIG, and a #VIG launch tube connected to the rear end of the VIG launch tube. A drum am is provided with a drum capable of rolling the film, and by injecting pressure fluid into the 5H pipe from the VIG, as the VIG moves in and out of the pipe, the film dammed to the VIG is sequentially moved. It is configured to be fed out from a drum.

This invention will be partially explained below with reference to the embodiments shown in Ruko Zukaku.

The method according to the present invention can be applied to both t# pipes and existing old pipes. When applying this method to old pipes, it is desirable to use a known scale removal tool to remove scale within fJ and smooth the pipe wall.

As shown in No. 11a, the pipe inner wall protection film is shaped like JJ5.
．． ``f bud 1 m1 7 lunge 11 tubular synthetic tree rJ
7 langes am'i'l of the cylindrical firing f3 for firing the Big 2 for towing Noilm are screwed together and fixed with bolts 4.4. The launch tube 3 has an output water inlet 3 for pumping VIG.
b is formed. 3. is pressure tr, 3d is pressure &l
I'm a dumb person. The big 2 installed in this launch tube 3 is fl
It has a known shape and a telegraph machine, except that a wire robe and a manila robe F-shaped synthetic resin film forming means 2a are attached to the IT part.

A drum 5 connected to the launch tube 3 is rotatably supported via a roller bearing 5 against a fixed shaft 5aK.
A housing 5c with a built-in housing 5c and a cover body 5d (Fig. 2) are formed.A protrusion s5 is formed in a part of the housing 5, and an opening part of the protrusion 5 is formed. f is a flange 5g that matches the 7 langes 3 of the Vig launch tube 3, and 13 indicates a punkin.

The drum 5bK of the drum device 5 wraps the tubular synthetic resin film 6 11 times to form a pipe inner wall protection film.

The tubular synthetic resin film 6 used in the method of the present invention has an outer diameter that is slightly longer than the length of the conduit through which the film is to be attached, and has an outer diameter approximately equal to the inner diameter of V, and has an open flesh layer. A tubular synthetic resin film is required. This film is made of ethylene thread ionomer. Fluorine resin, Tetron, nylon.

Urethane and other combinations! It can be made from i and m fat.

The thickness of the 7th is the pipe diameter, fluid temperature, etc. (depending on the sail 1 stroke to 10M)
Select as appropriate between armpit and 0.

K, who uses the above-mentioned device to form a protective film on the inner wall of the tube, first places the VIG launch tube 3 fixed to the tube 1 on the launch tube 3, and then installs the VIG launch tube 3 on the launch tube 3, and then the drum 5b of the drum device 5. The drawn-out end 6a of the rotated tubular synthetic resin film 6 is attached to the film attaching means 2aKI4 of the Big 2! ! Then, overlap the 7 flange 5g of the drum device 5 with the flange 3eK of the launch tube 3, and secure with bolts 7°7. This completes the preparations for launching the VIG.

Next, pressurized water is injected from the VIG pressure water injection port 3b of the launch tube 3. Pressure water W (indicated by diagonal lines in Figure 1) is fired 'f! 3 and the housing 5 of the drum device 5 communicating therewith.
＠Fill the inside, ノ) The air inside Uzing sC is empty'12t
Vi, is discharged to the outside from valve No. 5.

Filling the firing W3 and the drum device 5 with pressure water W:
As water is continued to be poured sparingly, Big 2 is pushed by the water pressure and is forced into fl in the direction of arrow A in the m1 diagram.

As the Big 2 travels inside the pipe, the tubular synthetic resin film 64 attached to the Big 2 is unwound from the Ni drum 5b, and the Big 2 moves to the pipe 1 and 4&lfi<, and the film 6 moves to the pipe 1.
Kfi from one end to the other end. At this point, the injection of pressurized water is stopped, the film 6 is removed from the big 2, and the launch tube 3 and drum device 5 are removed from the tube 1. The film 6 is cut to a predetermined length (or the film may be wound around a drum in advance to the required length).

With the film 6 placed inside the tube in this way, the film 60 is fired at the end of the tube and expanded to 1 m from the flange of the tube.
As shown in Figure 3, the short f8
be fixed thereon by means of energizing, such as by providing a bolt. Furthermore, the closed big launch tube 3' at the end is shortened to Q18.
Connect to Eff. The terminal 7 flange 1b of '11 on the opposite side of the launch tube 3' is connected to the vacuum pump ■P via the short 1f9. Reference numeral 10 is a big stopper with 7 flange 1bKI4B attached to stop the running of the big at the end of the tube.

Once the above work is completed, attach the VIG 2' to the launch tube 3 again. In this case, the convenient big 2' may be the usual big of JJIi. firing? When the pressure of 3'*pressure/K is injected from the water inlet 3'b, the big 2' is forced to expand 1 of the film 6.
From part 211, the film is fed under pressure through Wl so as to penetrate through the film. At the same time as the VIG is running, operate the vacuum pump vP to remove the water and air remaining in the pipe 1.2tIiR
Make it 5. The big 2' is made of an elastic material such as urethane foam, and its diameter is slightly larger than the inner diameter of the tube. As the vig moves, the film 6 is pressed against the stomach wall, water and air between the film 6 and the canal wall are completely eliminated, and the film 6 is brought into close contact with the canal wall f, forming a bud inner wall protection film. In addition, in the above example, the water and air between the film and the inner wall of the pipe can be removed just by running the VIG without using the vacuum pump PVK to remove water and air from inside the pipe. When used in conjunction with pump operation, the formation of a protective film on the inner wall of the pipe can be further improved.
You can actually do it. After forming the tube inner wall retaining film in this way, VIG 2', vacuum bong vP, short IF9
．． Remove the eyelid from tube 1 and remove the film 60.
Attach the flange 1bKIGl to the extruded wood part, and short pipe (not shown)
Fix it with AN member.

Although the embodiments described above are effective for implementing the method of the present invention, the apparatus for implementing the method of the present invention is not limited to the above embodiments.

For example, depending on the conditions for carrying out the method of the present invention, instead of using the drum device 5, the rear end of the pig firing v3 may be closed, and a slit for inserting the film 6 may be formed at this rear end. It is also possible to construct a structure in which the film 6 towed by the VIG 2 is drawn into the pipe through the pipe. Due to the large 2 degrees of sizing, it is necessary to apply a suitable rope shaving to the shaft.

On the other hand, when using pressurized water, the water acts as a lubricant between the heavy wall and the film, so it is more advantageous than the method using compressed air. It is valid.

In addition, in the above-mentioned actual myu, the case where only one layer of intraductal phlegm pus film is provided has been explained, but the present invention is not limited to this.
By repeating the same method, it is possible to form protective films with an increased number of II.

According to this statement 1, one end of the tubular synthetic resin film is m
An extremely simple method of running the second big placed inside the pipe through the film prevents corrosion and scaling of the pipe, a problem that could not be solved in the past. problems can be solved all at once.

Since the formation of the protective film can be completed in an extremely short time even in a long pipe with thousands of pipes, the construction time is extremely short. The running speed of this big can be adjusted by the flow rate of the pressure body, so it is possible to prevent damage to the film or clogging in the pipe due to sudden film advancement. It can also be carried out without any problem even if the pipe is bent in the middle or has a large height.The pipe inner wall protection film formed by this method does not corrode due to chemicals. Also, if you use a film from the Fluorine Bond Monthly Exhibition, it has heat resistance of 1,200℃ to 180℃.Also, it has a heat resistance of 1,200℃ to 180℃. It has an extremely excellent effect in that it can prevent corrosion and scale formation on the inner wall of the pipe for many years without causing any corrosion.

Further, the device of the present invention makes it possible to unwind a film wound around a drum and send it into a pipe without causing any loss of pressure water to the outside.

This makes it possible to feed the film attached to the pipe under pressure into the pipe together with water, and as a result, the frictional resistance between the film and the pipe wall can be kept to a minimum.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a -'% reduction example of the method and apparatus according to the present invention, FIG. 2 is a full-circle view of the drum device, and FIG. ! FIG. 3 is a diagram showing a partial cross section of one root to be formed into j layers. 1...Bud, 2.2'...Vig, 3...Vig launch tube% 5...Drum f device, 6...Film.

Claims (1)

[Scope of Claims] 1. F-shaped synthetic resin film m- is attached to the I@1 big pipe and run in the 1M first big pipe, so that the tubular synthetic resin film is placed inside the pipe. After loading and unloading from the VIG, the second VIG was then run into the tubular synthetic resin film, so that the tubular synthetic resin film was brought into close contact with the inner tank of the pipe, thereby forming a pipe inner wall preservation film. Method for preventing corrosion of pipe inner walls. 2. * A VIG equipped with a means for attaching a tubular synthetic resin film at the end, a VIG launch tube equipped with a pressure water inlet for pumping VIG, and a σ tubular synthetic resin film connected to Shunru S of the M VIG launch tube. A drum device for forming a film for protecting the inner wall of a pipe and a drum device having a drum inside which can be wound. Electricity/