JP2020090971A - Pipe repair method for methanol delivery - Google Patents

Abstract

To provide a pipe repair method for methanol delivery, capable of simply and safely repairing a pipe.SOLUTION: A pipe repair method for methanol delivery, for performing repair upon damaging a pipe, comprises an inspection process of confirming the presence/absence of damage on the pipe; an application process of applying a methanol-resistant joining material to a rubber lining surface of a pair of half-clamps with rubber lining inside, at the time of finding damage; and a joining process of covering and fixing the damaged part of the pipe by sandwiching it with the pair of half-clamps coated with the joining material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for repairing a pipe for feeding methanol, which repairs when a pipe is damaged.

Methanol can be obtained inexpensively from natural gas and wastes, and is useful as an organic solvent or fuel, or as a raw material for synthesizing various organic substances, and is therefore widely traded all over the world. Since the specific gravity of methanol is slightly smaller than that of water, it is easy to transport by sea by ship.

Hydrogen can be obtained from methanol by a thermal decomposition reaction. Since hydrogen easily volatilizes, diffuses, and permeates, it is difficult to store large amounts at room temperature without paying special attention to explosion. On the other hand, since methanol is a liquid at room temperature, unlike hydrogen, it is difficult to mix with air and can be stored in a large amount in a small container.

Due to such characteristics, it is common to store methanol in a place where hydrogen is used and generate and use as much hydrogen as needed each time. For example, methanol received by sea transport is received from a carrier ship in a storage container through a pipe and then sent to a thermal decomposition device through a pipe to obtain hydrogen in the thermal decomposition device.

Methanol transported by sea is received through piping on a pier installed on the sea. The methanol receiving pipe receives a force from the outside when the carrier ship sways in waves, receives a force from the inside by pumping methanol, and receives a force from itself due to expansion and contraction of the pipe due to a temperature difference. The pipe is rubbed by such a force, and the structural member supporting the pipe and the lower portion of the pipe are rubbed and worn. In addition, the environment is prone to corrosion (including elution of organic resin and reaction with salt) due to methanol and salt air. Eventually, holes in the piping occur due to wear and corrosion.

As a pipe repair method, for example, in Patent Document 1, there is a pipe repair method for repairing a pipe in which a hole has been formed due to metal thinning, in which cold spray is used to build up the periphery of the hole and fill the molten metal by welding. Then, the hole is closed, and cold spraying is performed again to build up the closed hole and the periphery thereof, and a pipe repairing method is described.

JP, 2018-87609, A

However, since methanol is a flammable liquid, it is difficult to repair it by heating the pipe as in Patent Document 1. Further, cutting pipes that cause sparks or repairing welding using fire is dangerous because it may ignite internal methanol or residual methanol gas.

In addition, it may be possible to construct it so as to cover the perforated area with FRP material etc., but it may be damaged by the liquid sending pressure at the time of reception, and since FRP with methanol resistance must be used, it is not adopted difficult.

The present invention has been proposed in view of such circumstances, and an object of the present invention is to provide a method for repairing a pipe for feeding methanol, which enables simple and safe repair work on a pipe.

As a result of diligent studies, the inventors of the present invention safely sandwiched the pipe without performing a fire work by sandwiching the pipe with a methanol-resistant joining material and a rubber-lined clamp material at a damaged portion of the pipe due to corrosion and abrasion. The inventors have found that repair can be performed, and have completed the present invention.

That is, one aspect of the present invention is a method for repairing a pipe for feeding methanol for repairing when a pipe is damaged, which includes an inspection step for checking the presence or absence of damage to the pipe, and a rubber lining inside when the damage is found. The application process of applying a bonding material with methanol resistance to the rubber lining surface of the pair of half-clamps, and the joining to cover and fix the damaged part of the pipe with the pair of half-clamps with the bonding material applied. And the process.

According to an aspect of the present invention, by sandwiching a pipe with a methanol-resistant joining material and a rubber-lined clamp material, it is possible to easily and safely perform pipe repair without performing a fire work.

At this time, in one aspect of the present invention, the bonding material may be titanium-reinforced epoxy putty.

Epoxy putty containing titanium is preferable because it has excellent corrosion resistance and methanol resistance.

Further, in one aspect of the present invention, the damage to the pipe may be on the lower side of the pipe.

Since the methanol liquid sending pipe according to one aspect of the present invention may be installed on the ocean or near the coast, the action of salt toward the lower side near the sea surface is large. Further, a portion where the liquid phase portion of methanol is present and is consumed from the inside is also on the lower side. According to one embodiment of the present invention, even if the user does not work in a difficult posture for a long time, the lower side can be evenly pressed against the lower side as shown in FIG. Thus, it is particularly common to deal with the wear of pipes and the corrosion of seawater.

In addition, in one embodiment of the present invention, the pipe may have damage or unevenness around the damage.

According to one embodiment of the present invention, by sandwiching a pipe with a bonding material having resistance to methanol and a rubber-lined clamp material, damage or unevenness in the pipe can be eliminated.

Further, in one aspect of the present invention, the pipe may be installed on a pier on the ocean.

In one aspect of the present invention, methanol is transported to the sea and then sent to a tank or the like on the ground, so that it is used in a situation where the solution is sent on a construction bridge over the ocean.

According to the present invention, for damage to a flammable fluid pipe, pipe repair can be performed without using a special device and without performing a fire work. Accordingly, it is possible to provide a method for repairing a pipe for feeding methanol, which enables simple and safe repair work on the pipe.

It is a flowchart showing the outline of the process in the pipe repair method for methanol sending concerning one embodiment of the present invention. It is sectional drawing which shows an example of the pipe repair member used with the pipe repair method for methanol liquid feeding which concerns on one Embodiment of this invention. It is sectional drawing showing the state of the piping after the repair in the pipe repair method for methanol liquid feeding which concerns on one Embodiment of this invention. It is a figure showing the repaired state of the piping after the end of the joining process in the method for repairing a pipe for feeding methanol according to an embodiment of the present invention.

Specific embodiments to which the present invention is applied will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the present invention.

As described above, methanol is used as the raw material of hydrogen gas. Methanol is a flammable compound that is liquid at room temperature. Methanol used in the hydrogen generation facility will be transported by sea, etc., and then received through piping on a pier installed on the ocean.

This methanol feeding pipe is placed on a support member such as a channel steel installed on a construction bridge over the ocean. The methanol delivery pipe moves back and forth in the delivery direction due to the expansion and contraction of the pipe due to temperature differences and the pressure feed of methanol.Therefore, if the pipe is used for a certain period or longer, the wear between the pipe and the support member causes Is damaged and eventually pierces. Moreover, since the pipe is in contact with methanol and the pipe is installed on the ocean, corrosion is likely to occur around the damaged portion of the pipe due to liquid dripping, sea breeze and the like. A method for repairing a pipe for feeding methanol according to an embodiment of the present invention is a method capable of simply and safely performing a repair work on a pipe in such a situation.

FIG. 1 is a process diagram showing an outline of a process in a method for repairing a pipe for feeding methanol according to an embodiment of the present invention. One aspect of the present invention is a method for repairing a pipe for feeding methanol for repairing when a pipe is damaged, which includes an inspection step S1 for confirming whether the pipe is damaged, and a rubber lining provided inside when the damage is found. Applying step S2 of applying a bonding material having methanol resistance to the rubber lining surface of the pair of half-clamps, and joining to fix the damaged part of the pipe so as to sandwich the damaged part with the pair of half-clamps to which the bonding material is applied. And step S3.

In the inspection step S1, it is confirmed whether the pipe is damaged. The inspection will be conducted visually during periodic inspections. In particular, since the vicinity of the contact portion between the support member supporting the pipe and the pipe is easily damaged by abrasion, it is preferable to intensively inspect such a place. Alternatively, a method may be used in which an abnormality is detected by sensing a liquid feed amount, a pressure change in the pipe, and the like with a sensor.

The applying step S2 is a step of applying a methanol-resistant joining material to the rubber lining surfaces of a pair of half-clamps having rubber linings inside when the damage to the pipe is found in the inspection step S1. ..

FIG. 2 is a sectional view showing an example of a pipe repair member used in the method for repairing a pipe for feeding methanol according to an embodiment of the present invention. The pipe repair member 10 is, for example, a steel half-clamp 11 slightly larger than the half circumference part of the pipe as shown in FIG. 2, and the inner surface of the half-clamp 11 is provided with a rubber lining 12. .. In the present invention, the half-clamp 11 provided with the rubber lining 12 is used as the pipe repair member 10. However, as will be described later, a state in which the bonding material 13 is applied to the rubber lining 12 surface, A state in which a pair of the above-mentioned half clamps 11 covers and fixes the damaged portion of the pipe so as to sandwich the damaged portion is also referred to as a pipe repair member. The rubber lining 12 plays a role of eliminating the gap due to the unevenness when covered by the half-clamp 11 when the repair target portion of the pipe is corroded and has unevenness due to rust or the like. This can eliminate or reduce the polishing work for unevenness.

The joining material 13 applied to the surface of the rubber lining 12 of the half clamp 11 is for joining the pipe repair member 10 to the damaged portion of the pipe. Since the present invention mainly targets the pipe for feeding methanol, it is preferable that the bonding material 13 be one having resistance to methanol, for example, an epoxy bonding material such as epoxy putty. Further, it is more preferable to use a titanium-reinforced epoxy putty containing titanium in order to improve the mechanical strength of the epoxy putty. Epoxy putty is generally polymerized and cured by mixing two agents each containing a prepolymer of epoxy resin and a curing agent, so the coating step S2 is performed near the pipe where the damage is found, and then It is desirable to move to the bonding step S3 promptly.

In the joining step S3, the damaged portion of the pipe is covered and fixed by a pair of half-clamps in which the inner rubber lining surface is coated with the joining material in the applying step S2. FIG. 3 is a cross-sectional view showing a state of the pipe 20 after the repair in the method for repairing the methanol liquid sending pipe according to the embodiment of the present invention. In the joining step S3, as shown in FIG. 3, the damaged portion 22 of the methanol liquid feeding pipe 21 is covered with a rubber lining 24 coated with a joining material 23 for repair. Since the rubber lining 24 has elasticity and elasticity, even if the damaged portion of the pipe or its periphery is an uneven surface such as rust, by covering it with the rubber lining 24 coated with the bonding material 23, the gap is closed. It can be repaired and the liquid leakage can be prevented.

In order to keep the half clamp 25 bonded to the pipe 20 until the joining material 23 is solidified, it is desirable to fix the collar portion 26 of the half clamp 25 with a fastening bolt nut 27 or the like. . In addition, even after the joining material is solidified, it is possible to prevent the half clamp 25 from coming off the pipe 20 due to vibration, weather, or the like by keeping it fixed with the fastening bolt nut 27. Although there is little concern about rust on the collar portion 26 of the half-clamp 25, it is preferable to apply a bonding material to the collar portion 26 in order to make the distortion small and adhere closely. For the half-clamp 25, it is preferable to use a material having excellent corrosion resistance or a member that can be easily processed. For example, it is possible to use a material suitable for the methanol liquid sending pipe 21 such as a steel material or a stainless steel material. Depending on the extent of the repair range and the thickness of the pipe, if the half clamp 25 is provided with a rib, the rigidity is high and the fixing work can be facilitated.

As described above, according to the present invention, the piping can be sandwiched between the methanol-resistant joining material and the rubber-lined clamping material, so that the piping repair can be performed easily and safely without performing the fire work. .. Note that, although one embodiment of the present invention has been described with reference to the methanol liquid-feeding pipe, the liquid-feeding target is not necessarily limited to only methanol, and even in the case of other combustible liquids, the present invention can be used. It is possible to apply repair methods.

The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples and comparative examples.

(Comparative example)
In the comparative example, methanol was fed by piping in the conventional manner. During the periodic inspection, damage and liquid leakage were found under the pipe near the contact point between the pipe and the support member. It is considered that the breakage of the pipe is caused by the damage between the pipe and the support member and the damaged portion being corroded by seawater.

(Example)
The method for repairing a pipe for feeding methanol according to an embodiment of the present invention was applied to the damaged portion of the pipe. That is, after the damaged portion was found, titanium reinforced epoxy putty was applied to the rubber lining surface of the half-clamp having the rubber lining on the inside. It was sandwiched by a pair of half-clamps coated with titanium reinforced epoxy putty so as to cover the damaged portion of the methanol liquid feeding pipe, and fixed with fastening bolts and nuts (see FIG. 4).

By carrying out the above method for repairing the pipe for feeding methanol, the damaged part of the pipe for feeding methanol was repaired, and the leakage of methanol was also eliminated. While the pipe repair member (a fixed pair of half-clamps) was left as it was, the methanol feed was restarted to produce hydrogen, but no damage or leak of the repaired part was confirmed thereafter.

From the above results, it was confirmed that by applying the method for repairing a pipe for feeding methanol according to one embodiment of the present invention, the pipe repair work can be performed easily and safely.

Although one embodiment and each example of the present invention have been described in detail as above, it is understood by those skilled in the art that many modifications are possible without materially departing from the novel matters and effects of the present invention. , It will be easy to understand. Therefore, such modified examples are all included in the scope of the present invention.

For example, a term described in the specification or the drawings at least once together with a different term having a broader meaning or the same meaning can be replaced with the different term in any place in the specification or the drawing. Further, the configuration of the method for repairing the pipe for feeding methanol is not limited to the one described in the embodiment and the examples of the present invention, and various modifications can be made.

10 pipe repair member, 11 half clamp, 12 rubber lining, 13 joining material, 20 pipe after repair, 21 methanol feed pipe, 22 damaged part, 23 joining material, 24 rubber lining, 25 half clamp, 26 brim Part, 27 Bolt nut for fastening

Claims (5)

A method for repairing a pipe for feeding methanol, which repairs when the pipe is damaged,
An inspection process to check the pipes for damage,
An application step of applying a bonding material having methanol resistance to the rubber lining surfaces of a pair of half-clamps having a rubber lining inside when the damage is found;
And a joining step of covering and fixing the damaged portion of the pipe so as to sandwich the damaged portion with the pair of half clamps coated with the joining material. The method for repairing a pipe for feeding a methanol according to claim 1, wherein the bonding material is a titanium-reinforced epoxy putty. The method for repairing a pipe for feeding a methanol according to claim 1 or 2, wherein the damage to the pipe is on the lower side of the pipe. The said pipe has damage or unevenness|corrugation in the circumference|surroundings, The pipe repair method for methanol liquid feeding of any one of Claim 1 thru|or 3 characterized by the above-mentioned. The method for repairing a methanol liquid sending pipe according to any one of claims 1 to 4, wherein the pipe is installed on a construction bridge over the ocean.

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