JP6951042B2 - Oil pipe internal lining construction method - Google Patents

Description

The present invention relates to an internal lining construction method for buried pipes arranged in equipment such as a gas station for storing gasoline and oils.

Today, soil pollution due to leakage of oils such as gasoline has become a social problem. Such oil leaks occur due to corrosion and pitting corrosion of the tanks and pipes due to the long-term use of underground tanks and buried pipes that store oils such as gasoline. In this case, the pipe is a steel pipe (steel pipe), and for example, the outer surface thereof is coated (polyethylene) to prevent corrosion. Further, in the case of a buried tank, a method disclosed in Patent Document 1 has also been proposed.

Japanese Unexamined Patent Publication No. 2003-261195

In addition, work is being done to coat the inside of pipes that have been used for many years with resin and continue to use them, but simply coating the inner peripheral surface of the pipe with resin will cause the coated resin to become the pipe. If the piping is not sufficiently adhered and the use is continued, the piping will be clogged and the coated resin will be peeled off, which may cause clogging of the measuring machine or the like located at the tip of the piping.

This is due to the fact that rust generated on the pipes that have been used for many years and burrs during welding remain, and the coating resin does not adhere to the pipes securely.
Therefore, in order to solve the above problems, the present invention performs degreasing cleaning to remove oil in the pipe and removes rust and burrs generated inside the pipe before coating the inner peripheral surface of the pipe with resin. This is to propose an oil pipe internal lining construction that surely coats the inner peripheral surface of the pipe with a resin such as vinyl ester of a certain thickness. In particular, by using a fiber member in which a resin is impregnated into a glass fiber, a lining construction method without peeling is provided.

In order to solve the above problems, the present invention uses a first treatment of passing a cleaning pig through a pipe using water pressure to remove oil inside the pipe, and using gas pressure inside the pipe from which oil has been removed. A second process of removing rust and burrs inside the pipe through a rust removing pig, and a tubular glass fiber member containing resin is inserted into the pipe from which rust and burrs have been removed, and gas is used. Provided is a third process of passing a predetermined spherical member through the glass fiber member using pressure to perform a lining of a certain thickness on the inner peripheral surface of the pipe, and an oil pipe internal lining to perform the lining.

The lining construction performed by passing the spherical member through the glass fiber member fitted in the pipe uses a spherical member having a diameter corresponding to the thickness of the glass fiber member.

The resin contained in the glass fiber member is characterized by a vinyl ester or bisphenol resins.

According to the present invention, the coated resin does not adhere to the pipe as in the conventional case, and the pipe is clogged by continuing to use the pipe, and the coated resin is peeled off, which causes clogging of a measuring machine or the like. Never become. In particular, the present invention provides a lining construction that reliably prevents peeling by performing a lining construction using a fiber member in which a resin is impregnated into a glass fiber.

It is a block diagram of the piping system for demonstrating the oil pipe internal lining construction of this embodiment. It is a figure which shows the cross-sectional structure of the piping system including a tank and a pipe (lubrication pipe). .. It is sectional drawing of the part AA'shown in FIG. It is a figure explaining the process of removing the oil content in a pipe. FIGS. (A) to (C) are diagrams for explaining a process for removing rust, weld line burrs, and the like inside the pipe. It is a figure explaining the glass fiber member, (a) is the figure which shows the structure of the glass fiber member to use, (b) is the figure which attached the string of a predetermined length to the glass fiber member of the said structure, and glass fiber in the pipe. It is a figure explaining the structure at the time of installing a member. It is a figure explaining the oil pipe internal lining construction of this example, (a) is the figure which shows the state which the glass fiber member containing the resin of the same length is arranged inside the pipe, (b) is the figure which is spherical. It is a figure which shows the state just before moving a lining pig in the direction of an arrow, (c) is a figure which shows the state which the lining pig is moving in the direction of an arrow in a pipe , and (d) is a figure which shows the state which is moving in the direction of an arrow by a gas pressure. Further, it is a figure which shows the state which the lining pig moves in the direction of an arrow, and the lining pig reaches the other end of a pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Figure 1 is a diagram for explaining an oil pipe inner lining method of the present embodiment is intended to apply to a pipe for use in storing oil (gasoline) in buried tank. In this example, as buried pipes, lubricate the gasoline tank of buried underground petrol station, also showing an example of a buried pipe for refueling the gasoline to the vehicle from the tank.

In the figure, underground tanks (hereinafter, simply referred to as tank) lubrication tube 2 to 1 to lubricate the oil (gasoline), the oil supply pipe 3 for lubrication oil (gasoline) from the tank 1, through which performs the ventilation of the tank 1 trachea 4, and the liquid level meter 5 for measuring the liquid level height of the tank 1 into the stored oil (gasoline) is provided. Further, the tank 1 is buried at a predetermined depth from the ground surface, and concrete 10 is installed on the tank 1.

Further, the lubrication tube 2 oil port 6 is provided on the ground, perform lubrication oil (gasoline) from the oil port 6. Furthermore, meter to the surface in the oil supply pipe 3, pump equipment 7 is provided with, aspirated oil (gasoline) from the tank 1, and metering of oil (gasoline) for sucking. Further, a valve 8 is provided in the lubrication pipe 2, and a valve 9 is also provided in the lubrication pipe 3, and the valves 8 and 9 are closed when the tank 1 is repaired / repaired. The ventilation pipe 4 is provided with a ventilation port 4a to discharge the gas generated in the tank 1.

FIG. 2 shows a cross-sectional structure including the tank 1 and the lubrication pipe 2 in particular. As described above, lubrication tube 2 oil port 6 is provided in the oil (gasoline) is lubricated from oil port 6, lubrication tube 2 (hereinafter, simply referred to as pipe 2) oil tank 1 through the (gasoline N) is stored. Further, FIG. 3 is a cross-sectional view of the portion AA'shown in FIG. 2, which shows the internal state of the pipe 2 that has been used for a long period of time. As shown in the figure, the pipe 2 is used for a long period of time, for example, rust is generated on the inner peripheral surface, and oil is also thickly adhered to the pipe 2. In FIG. 3, rust and adhering oil generated on the inner peripheral surface of the pipe 2 are shown as a scale 13.

The oil pipe internal lining of this example is applied to the pipe 2 in such a state. 4 to 7 are views for explaining the oil pipe internal lining construction of this example.
First, as shown in FIG. 4, the inside of the pipe 2 is cleaned with the cleaning pig 11. Specifically, a cleaning pig 11 having an outer diameter corresponding to the inner diameter of the pipe 2 is inserted from one end 2a of the pipe 2, and a predetermined water pressure 15 is applied from behind the cleaning pig 11.

By this operation, the cleaning pig 11 moves in the direction of the arrow by the water pressure 15, and the cleaning pig 11 passes through the pipe 2. The peripheral surface of the cleaning pig 11 used at this time is made of a relatively soft material 14, and the oil inside the pipe 2 is adsorbed on the peripheral surface of the cleaning pig 11 and discharged from the other end 2b of the pipe 2. ..

In the example shown in FIG. 4, one end 2a of the pipe 2 corresponds to one end of the cross section of the part AA'shown in FIG. 3, but in reality, the pipe (lubricating pipe) 2 shown in FIGS. 1 and 2 The cleaning pig 11 is inserted from the lubrication port 6, water pressure 15 is applied to the cleaning pig 11, and the cleaning pig 11 is passed through the pipe (lubrication pipe) 2 to remove the oil remaining in the pipe (lubrication pipe) 2.

The oil content removing treatment using the cleaning pig 11 is actually performed a plurality of times. Specifically, after the first cleaning treatment of the inside of the pipe is performed by the above method, the inside is investigated using, for example, a fiberscope, and the cleaning pig 11 is selected based on the result, and the pipe 2 is used. The process of removing the oil inside is repeated. Therefore, as the cleaning pig 11, for example, a plurality of soft materials 14 used for the peripheral surface are prepared, and are selected and used based on the above survey results. For example, different materials 14 such as sponge and cloth are used, and the number of times they are used is also set based on the above survey results.

Next, for the pipe 2 from which the oil content has been removed by the above operation, rust, welding line burrs, and the like inside the pipe 2 are removed by using the rust removing pig 16 shown in FIG. A gas such as compressed air is used to remove rust and burrs on the welding line inside the pipe 2.

Specifically, a gas pressure 17 is applied to the rust removing pig 16, and the rust removing pig 16 is passed through the pipe 2 to remove rust, welding line burrs, and the like inside the pipe 2. In order to remove rust and burrs inside the pipe 1 on the peripheral surface of the rust removing pig 16 used at this time, a hard material 18 having a predetermined shape is used to surely remove rust and weld line burrs inside the pipe 2. do.

The work using the rust removing pig 16 is also performed a plurality of times. That is, as shown in FIGS. 5A to 5C, rust removing pigs 16a to 16c having slightly different outer shapes are used to remove rust and weld line burrs inside the pipe 2. In order to remove rust and burrs inside the pipe 2, hard materials 18a to 18c of a predetermined shape are used for the peripheral surfaces of the rust removing pigs 16a to 16c used at this time, and rust and welding lines inside the pipe 2 are surely used. Remove burrs and the like.

In the explanations of FIGS. 5A to 5C, three types of rust removing pigs 16a to 16c having different outer shapes were used, but a larger number of rust removing pigs 16 were prepared and the same work was performed four times. The above may be repeated to remove rust, weld line burrs, and the like inside the pipe 2.

Further, the shape of the hard material 18 used for the rust removing pig 16 may be, for example, a spiral shape or various shapes such as a convex shape. In this operation, sparks due to friction may be generated inside the pipe 2, but the oil content by the cleaning pig 11 has already been removed, and the work can be performed safely.

In addition, after the above work, it is carefully checked whether rust, burrs, deposits, etc. have been completely removed by using, for example, a fiberscope. Of course, at this time, if rust, burrs, deposits, etc. remain, the work with the rust removing pig 16 is repeated again.

After removing rust, burrs, etc. in the pipe 2, the inside of the pipe 2 is dried. In this case, for example, warm air is sent from one end of the pipe 2 to improve the efficiency of the lining work inside the pipe to be performed later.

Next, the inside of the pipe 2 is lined using a fiber member in which resin is impregnated into glass fiber and a lining pig. FIG. 6 is a diagram for explaining the glass fiber member used for this work, and FIG. 6A is a diagram showing the configuration of the glass fiber member 23 to be used. The glass fiber member 23 of this example is processed into a tubular shape having a diameter and a length corresponding to the pipe 2 used.

The glass fiber member 23 has the heat resistance, nonflammability, and durability of glass and the flexibility of fibers, and fine fibers are intricately entwined to form multiple air layers in the woven fibers. doing. In particular glass fiber members 23 used in this embodiment, the air layer has a structure impregnated with resin, are impregnated with vinyl ester or bisphenol-based resins as a resin.

Further, FIG. 6B is a diagram showing a configuration when a string 24 having a predetermined length is attached to the glass fiber member 23 having the above configuration and the glass fiber member 23 is installed in the pipe 2. Specifically, a string 24 having a predetermined length (for example, a length corresponding to the length of the pipe 2) is tied to one end 25 of the glass fiber member 23, and a grip portion 22 is attached to the tip of the string 24. be. As described above, the glass fiber member 23 is a flexible member woven with fine fibers, and although it has a cylindrical shape, as shown in FIG. It is in a flexible state to some extent.

In this state, first, the glass fiber member 23 is fitted inside the pipe 2. This fitting is done using air pressure. For example, the string 24 tied to the glass fiber member 23 is carried into one end of the pipe 2, and the grip portion 22 provided at the tip of the string 24 is pneumatically blown from one end of the pipe 2 to the other end of the pipe 2. The glass fiber member 23 attached to the other end of the string 24 is fitted into the pipe 2 by pulling out the grip portion 22 that has reached the end from the pipe 2.

For example, if the length of the pipe 2 is 10 m, the glass fiber member 23 and the string 24 having the same length of 10 m are used, and the grip portion 22 is pneumatically blown to the other end of the pipe 2, and the grip portion 22 is used. The glass fiber member 23 can be installed inside the 10 m pipe 2 by pulling out the glass fiber member 23 from the pipe 2.

FIG. 7A is a diagram showing this state. A glass fiber member 23 having the same length is fitted inside the pipe 2 along the inner circumference of the pipe 2. Further, as described above, the resin has penetrated into the glass fiber member 23 fitted at this time, and the glass fiber member 23 is still in a flexible state.

Next, in this state, a spherical lining pig 26 is inserted from one end 2a of the pipe 2, and a predetermined gas pressure 27 is applied from behind the pig 26. FIG. 7B is a diagram showing this state, in which the spherical lining pig 26 moves in the direction of the arrow inside the glass fiber member 23 arranged along the pipe 2 by the gas pressure 27.

Here, for example, if the thickness of the glass fiber member 23 is 2 mm, the diameter of the lining pig 26 is 4 mm shorter than the inner diameter of the pipe 2. By using the lining pig 26 having such a diameter, the glass fiber member 23 having a thickness of 2 mm is pressed against the inner surface of the pipe 2, and the glass fiber member 23 is lined on the inner surface of the pipe 2 along the longitudinal direction of the pipe 2. can do.

FIG. 7C is a diagram showing a state in which the lining pig 26 is moving in the direction of the arrow in the arrangement 2, and the glass fiber member 23 is pressure-welded 28 to the inner surface of the pipe 2 through which the lining pig 26 has passed. Then, the inner surface of the pipe 2 is lined with a resin that has penetrated into the glass fiber member 23 having a predetermined thickness.

FIG. 7D is a diagram showing a state in which the lining pig 26 further moves in the direction of the arrow due to the gas pressure 27 and the lining pig 26 reaches the other end of the arrangement 2, and the lining pig 26 has passed through. A glass fiber member 23 is pressure-welded to the inner surface of the pipe 2, and a lining of a predetermined thickness is applied to the entire inner surface of the pipe 2.

In the above work, in consideration of the time for the resin pressed against the inner surface of the pipe 2 to cure, for example, this work is performed a plurality of times within a few hours. By repeating such an operation, it is possible to reliably perform the lining construction that is hard to peel off. The time interval and the number of operations can be arbitrarily set based on the type and composition of the resin to be used, as well as past experience and know-how.

Further, since the resin lining of this example is performed using the glass fiber member 23 containing the resin, it is possible to perform the lining on the inner surface of the uniform pipe 2, and the durability is a characteristic of the glass fiber. It is possible to perform lining construction that is excellent and also has excellent fire resistance.

After that, as the final work, for example, a fiberscope is used to check the uniformity of the lining surface and the presence or absence of unevenness, pinholes, etc., and an airtight inspection is further performed by a predetermined method to confirm that there is no leakage.

As described above, in the oil pipe internal lining construction of this example, the oil content in the pipe 2 is first removed, and then rust, weld line burrs, etc. in the pipe 2 are surely removed, and then the inner peripheral surface of the pipe 2 is removed. Perform lining construction of a certain thickness. At that time, since the glass fiber member 23 in which the resin has penetrated is used, the lining resin can be reliably adhered to the inner peripheral surface of the pipe 2, and the lining construction can be performed in which peeling is reliably prevented.

In the above description of this example, for example, the length of the pipe 2 is set to 10 m, but the length is not limited to 10 m, and the glass used corresponding to the length of the pipe 2 to be lined. It goes without saying that the length of the fiber member 23 is also set, and the length of the string 24 to be used is also set in the same manner.

Further, as the lining pig 26, it is possible to use a pig made of various materials such as a resin having a high hardness or a metallic material. Further, although the lining pig 26 was used in the above description of the lining construction, a high-pressure gas pressure such as compressed gas is applied after installing the glass fiber member 23 in the pipe 2 without using the lining pig 26. As a result, the piping 2 may be lined.

1 ... Underground tank 2 ... Piping (lubrication pipe)
2a ... One end 2b ... The other end 3 ... Lubrication pipe 4 ... Ventilation pipe 5 ... Liquid level gauge 6 ... Lubrication port 7 ... Equipment such as pumps 8, 9 ... Valve 10・ ・ Concrete 11 ・ ・ Cleaning pig 13 ・ ・ Scale 14 ・ ・ Soft material 15 ・ ・ Water pressure 16, 16a ~ 16c ・ ・ Pig for removing rust 17 ・ ・ Gas pressure 18, 18a ~ 18c ・ ・ Hard material 19, 19a ~ 19c ・ ・ Pig 22 for lining ・ ・ Grip part 23 ・ ・ Glass fiber member 24 ・ ・ String 26 ・ ・ Pig 27 for lining ・ ・ Gas pressure 28 ・ ・ Glass fiber member after pressure welding

Claims (5)

Peripheral surface prepares a plurality of cleaning pig soft different materials, using the water pressure through the plurality of cleaning pig in pipe, a first process for removing the oil inside the pipe,
Prepare the dedicated pig dropped different rust external shape, the pipe internal oil uses the gas pressure inside the pipe is removed off the rust through dedicated pig, first to remove rust or burrs inside pipe 2 processing and
The rusting inside pipes and burrs fitted a cylindrical glass fiber member containing a resin within said piping has been removed, using the gas pressure through a spherical member having a predetermined outer shape to said glass fiber member, the sphere A third process in which the glass fiber member is pressed against the inner peripheral surface of the pipe by the member and a lining of a certain thickness is applied to the inner peripheral surface of the pipe.
Oil pipe internal lining construction method characterized by performing. Wherein the plurality of cleaning pig, while adsorbing the oil inside the pipe on the circumferential surface, the oil pipe inner lining method according to claim 1, characterized in that for discharging the oil in the piping outside. The peripheral surface of the descaling dedicated pig is composed of a hard material a predetermined shape, an oil pipe inner lining method according to claim 1 or 2, characterized in that divided the rusting inside pipes or burrs. The first, second, or third aspect of claim 1, 2, or 3, wherein the lining construction performed by passing the spherical member through the glass fiber member fitted in the pipe uses a spherical member having an outer shape corresponding to the thickness of the glass fiber member. Oil pipe internal lining construction method. Resin contained in the glass fiber member, the oil pipe inner lining method according to claim 1, 2, 3, or 4, characterized in that vinyl esters and bisphenol-based resins.

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