JP2019027508A - Oil piping inner part lining construction method - Google Patents

Abstract

To provide an oil piping inner part lining construction method capable of reliably cleaning an inner part of piping which has oil part, rust, burr and the like owing to usage for long years and capable of performing lining construction of a predetermined thickness, in relation to oil piping inner part lining construction arranged on installation such as gasoline station, in which gasoline and oils are stored.SOLUTION: An oil piping inner part lining construction method includes a first processing of causing a washing pig to pass through piping by using hydraulic pressure to remove oil part on piping inner part, a second processing of causing a rust-removing private pig to pass through the piping inner part freed from oil part by using gas pressure to remove rust and burr on the piping inner part and a third processing of fitting a tubular glass fiber member which contains resin to the piping inner part freed from rust and burr on the piping inner part and causing a prescribed spherical member to pass into the glass fiber member by using gas pressure to perform lining construction of a constant thickness on an inner circumferential surface of the piping.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an internal lining construction method for a buried pipe disposed in a facility such as a gasoline station for storing gasoline or oils.

  Today, soil contamination due to leakage of oil such as gasoline is a social problem. Such oil leaks are caused by corrosion and pitting of tanks and pipes due to the use of underground tanks and buried pipes for storing oils such as gasoline for many years. In this case, the pipe is made of steel pipe (steel pipe), and for example, the outer surface is coated with a coating (polyethylene) to prevent corrosion. In the case of a buried tank, a method disclosed in Patent Document 1 has also been proposed.

JP 2003-261195 A

  In addition, pipes that have been used for many years have been coated with resin, and work to continue use is also being carried out, but simply by coating the inner peripheral surface of the pipe with resin, the coated resin can be applied to the pipe. If the adhesive is not sufficiently bonded and the use is continued, the pipe is clogged, and the coated resin is peeled off, which may cause clogging of a measuring machine or the like located at the tip of the pipe.

This is because rust generated in pipes used for many years and burrs during welding remain, and the coating resin is not securely adhered to the pipes.
Therefore, in order to solve the above problems, the present invention performs a degreasing cleaning for removing fat in the pipe before coating the resin on the inner peripheral surface of the pipe, and removing rust and burrs generated in the pipe. This is an oil pipe internal lining construction in which the inner peripheral surface of the pipe is reliably coated with a resin such as vinyl ester having a certain thickness. In particular, the present invention provides a lining construction method that does not peel off by using a fiber member in which a glass fiber is impregnated with a resin.

  In order to solve the above-mentioned problems, the present invention uses a first treatment for removing the oil content in the piping by passing a cleaning pig through the piping using water pressure, and using the gas pressure in the piping from which the oil content has been removed. Insert a cylindrical glass fiber member containing resin into the pipe from which the rust and burrs inside the pipe are removed, and the pipe inside the pipe from which rust and burrs have been removed, through a dedicated rust removal pig. An oil pipe internal lining construction is provided in which a predetermined spherical member is passed through the glass fiber member using pressure, and a third process is carried out to perform a lining construction with a constant thickness on the inner peripheral surface of the pipe.

  The lining construction performed through the spherical member in the glass fiber member fitted into 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 a vinyl ester or bisphenol resin.

  According to the present invention, the resin coated as in the past does not adhere to the pipe, and the pipe is clogged by continuing use, and the coated resin is peeled off, causing clogging of the weighing machine, etc. 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 glass fiber is impregnated with a resin.

It is a lineblock diagram of a piping system for explaining oil piping internal lining construction of this embodiment. It is a figure which shows the cross-section of the piping system containing a tank and piping (lubrication pipe | tube). . It is sectional drawing of the AA 'part shown in FIG. It is a figure explaining the process which removes the oil component inside piping. (A)-(c) is a figure explaining the process which removes the rust inside a piping, a weld line burr | flash, etc. FIG. It is a figure explaining a glass fiber member, (a) is a figure which shows the structure of the glass fiber member to be used, (b) attaches the string of predetermined length to the glass fiber member of the said structure, and glass fiber in piping 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 a figure showing the state where the glass fiber member containing the resin of the same length was arranged inside the pipe, and (b) is a spherical shape It is a figure which shows the state just before moving the lining pig in the arrow direction, (c) is a figure which shows the state in the middle of moving the inside of the lining pig in the arrow direction, and (d) is the gas pressure. Is a diagram showing a state where the lining pig is further moved in the direction of the arrow and the lining pig has reached the other end of the pipe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining an oil pipe internal lining construction method according to this embodiment, which is applied to a pipe used when oil (gasoline) is stored in a buried tank. In this example, as an embedded pipe, an example of an embedded pipe for injecting gasoline into a tank embedded in a basement of a gasoline station and supplying gasoline from the tank to a vehicle is shown.

  In the figure, an underground tank (hereinafter simply referred to as a tank) 1 is supplied with an oil supply pipe 2 for supplying oil (gasoline), an oil supply pipe 3 for supplying oil (gasoline) from the tank 1, and a ventilation pipe 4 for venting the tank 1. And a level gauge 5 for measuring the level of oil (gasoline) stored in the tank 1 is provided. The tank 1 is buried at a predetermined depth from the ground surface, and concrete 10 is provided on the tank 1.

  The oil supply pipe 2 is provided with an oil supply port 6 on the ground surface, and oil (gasoline) is supplied from the oil supply port 6. The oil supply pipe 3 is provided with equipment 7 such as a meter and a pump on the ground surface, and sucks oil (gasoline) from the tank 1 and measures the sucked oil (gasoline). Further, the oil supply pipe 2 is provided with a valve 8, and the oil supply pipe 3 is also provided with a valve 9. When the tank 1 is repaired / refurbished, the valves 8 and 9 are closed. The vent pipe 4 is provided with a vent 4a for exhausting the gas generated in the tank 1.

  FIG. 2 particularly shows a cross-sectional structure including the tank 1 and the oil supply pipe 2. As described above, the oil supply pipe 2 is provided with the oil supply port 6, oil (gasoline) is supplied from the oil supply port 6, and the oil (gasoline) is supplied to the tank 1 through the oil supply pipe 2 (hereinafter simply referred to as pipe 2). Is stored. FIG. 3 is a cross-sectional view taken along the line AA ′ shown in FIG. 2 and shows the internal state of the pipe 2 used for a long time. As shown in the figure, the pipe 2 has been used for a long time, for example, rust is generated on the inner peripheral surface, and the oil is also thickly attached. In FIG. 3, rust generated on the inner peripheral surface of the pipe 2 and oil adhering thereto are shown as a scale 13.

The oil pipe internal lining construction of this example is performed on the pipe 2 in such a state. 4-7 is a figure 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 a 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 2 a of the pipe 2, and a predetermined water pressure 15 is applied from the rear of the cleaning pig 11.

  By this operation, the cleaning pig 11 is moved 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 oil in the pipe 2 is discharged from the other end 2 b of the pipe 2 while adsorbing to the peripheral surface of the cleaning pig 11. .

  In the example shown in FIG. 4, one end 2a of the pipe 2 corresponds to one end of the cross section of the AA 'section shown in FIG. 3, but actually, the pipe (lubricating pipe) 2 shown in FIGS. The cleaning pig 11 is inserted from the oil inlet 6, the hydraulic pressure 15 is applied to the cleaning pig 11, and the oil is left in the pipe (oil supply pipe) 2 by passing through the pipe (oil supply pipe) 2.

  The oil removing process using the washing pig 11 is actually performed a plurality of times. Specifically, after performing the first cleaning inside the pipe by the above method, for example, an internal investigation is performed using a fiberscope, and the cleaning pig 11 is selected based on the result, and the pipe 2 Repeat the process to remove the oil content. Therefore, as the cleaning pig 11, for example, a plurality of soft materials 14 to be used on the peripheral surface are prepared, and selected based on the survey results. For example, different materials 14 such as sponges and cloths are used, and the number of times of use is also set based on the survey results.

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

  Specifically, the gas pressure 17 is applied to the rust removal dedicated pig 16, and the rust inside the pipe 2 and weld line burrs are removed through the rust removal dedicated pig 16 inside the pipe 2. The peripheral surface of the dedicated rust removal pig 16 used at this time removes rust and burrs from the inside of the pipe 1, so that a hard material 18 with a predetermined shape is used to reliably remove rust and weld line burrs from the inside of the pipe 2. To do.

  The operation using the rust removal pig 16 is also performed a plurality of times. That is, as shown in FIGS. 5A to 5C, the rust removing pigs 16a to 16c having slightly different external shapes are used to remove rust, weld line burrs, and the like inside the pipe 2. The rust removal dedicated pigs 16a to 16c used at this time are made of hard material 18a to 18c with a predetermined shape to remove rust and burrs inside the pipe 2, and the rust and weld lines inside the pipe 2 are surely used. Remove burrs, etc.

  In the description of FIGS. 5A to 5C, three types of rust removal pigs 16a to 16c having different external shapes are used. However, more rust removal pigs 16 are prepared, and the same operation is performed four times. The operation of removing rust, weld line burrs, and the like inside the pipe 2 may be performed repeatedly.

  Further, the shape of the hard material 18 used for the rust removal dedicated 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 component by the previous cleaning pig 11 is already removed, and the operation can be performed safely.

  Further, after the above operation, it is carefully checked whether rust, burrs, deposits, etc. are completely removed, for example, using a fiberscope. Of course, at this time, if rust, burrs, deposits, etc. remain, the operation by the pig 16 for rust removal is repeated again.

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

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

  This glass fiber member 23 has the heat resistance, nonflammability and durability of glass, and the flexibility of the fiber, and the thin fibers are intertwined in a complex manner to form multiple layers of air in the woven fiber. doing. In particular, the glass fiber member 23 used in this example has a structure in which a resin is soaked in the air layer. For example, a vinyl ester or a bisphenol resin is infiltrated as the resin.

  FIG. 6B is a diagram showing a configuration when a predetermined length of string 24 is attached to the glass fiber member 23 having the above-described 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 gripping portion 22 is attached to the tip of the string 24. is there. As described above, the glass fiber member 23 is a flexible member woven with thin fibers, and although it is cylindrical, as shown in FIG. It is in a somewhat flexible state.

  In this state, first, the glass fiber member 23 is inserted into the pipe 2. This insertion is performed 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 gripping 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 gripping portion 22 reaching 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 gripping part 22 is blown to the other end of the pipe 2 by air pressure. The glass fiber member 23 can be installed inside the 10 m pipe 2 by pulling out the pipe 2 from the pipe 2.

  FIG. 7A shows this state. Inside the pipe 2, a glass fiber member 23 having the same length is fitted along the inner periphery of the pipe 2. Further, the glass fiber member 23 inserted at this time is infiltrated with the resin as described above and still has flexibility.

  Next, in this state, a spherical lining pig 26 is inserted from one end 2 a of the pipe 2, and a predetermined gas pressure 27 is applied from the rear of the pig 26. FIG. 7B is a diagram showing this state, and the spherical lining pig 26 moves in the direction of the arrow inside the glass fiber member 23 disposed 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 view 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 pressed against the inner surface of the pipe 2 through which the lining pig 26 has passed. Then, a resin lining construction that penetrates the glass fiber member 23 having a predetermined thickness on the inner surface of the pipe 2 is performed.

  FIG. 7D is a view showing a state in which the lining pig 26 is further moved in the direction of the arrow by the gas pressure 27, and the lining pig 26 has reached the other end of the arrangement 2, and the lining pig 26 has passed. A glass fiber member 23 is pressed against the inner surface of the pipe 2, and a lining construction having a predetermined thickness is performed on the entire inner surface of the pipe 2.

  The above operation is performed a plurality of times, for example, for several hours in consideration of the time for curing the resin pressed against the inner surface of the pipe 2. By repeating such an operation, it is possible to reliably perform the lining construction that does not easily peel off. It should be noted that the time interval and the number of operations can be arbitrarily set based on the type and components of the resin used and the past experience and know-how.

  Moreover, since the resin lining construction of this example is performed using the glass fiber member 23 containing the resin, the lining construction can be applied to the inner surface of the uniform pipe 2 and the durability which is a characteristic of the glass fiber is achieved. Excellent lining construction with excellent fire resistance.

  After that, as a final work, for example, using a fiberscope is used to check the uniformity or unevenness of the lining surface, the presence or absence of pinholes, etc., and an airtight inspection is 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, first, oil in the pipe 2 is removed, and further, rust and weld line burrs in the pipe 2 are securely removed, and then the inner peripheral surface of the pipe 2 A certain thickness of lining is applied. At that time, since the glass fiber member 23 into which the resin has permeated is used, the lining resin can be reliably bonded to the inner peripheral surface of the pipe 2, and the lining construction in which peeling is reliably prevented can be performed.

  In the above description of the present example, the length of the pipe 2 has been described as 10 m, for example. However, the length of the pipe 2 is not limited to 10 m. Of course, the length of the fiber member 23 is also set, and the length of the string 24 to be used is set as well.

  Further, as the lining pig 26, it is possible to use pigs made of various materials such as high hardness resin or metal. Furthermore, although the lining pig 26 is used in the description of the lining construction, a high-pressure gas pressure such as a compressed gas is applied after the glass fiber member 23 is installed in the pipe 2 without using the lining pig 26. By doing so, the lining work may be performed on the pipe 2.

1 ... underground tank 2 ... piping (lubrication pipe)
2a ··· One end 2b ··· The other end 3 ··· Oil supply pipe 4 ··· Ventilation tube 5 ··· Level gauge 6 ··· Lubrication port 7 · · · Equipments 8, 9 such as pumps · · · Valve 10 ·· Concrete 11 · · Pig 13 for cleaning · · Scale 14 · · Soft material 15 · · Water pressure 16, 16a ~ 16c · · Pig 17 for rust removal · · Gas pressure 18, 18a ~ 18c · · Hard material 19, 19a ~ 19c · · Pig 22 for lining · · Grasping portion 23 · · Glass fiber member 24 · · String 26 · · Pig 27 for lining · · Gas pressure 28 · · Glass fiber member after pressure welding

The present invention relates to an internal lining construction method for a buried pipe disposed in a hazardous material facility such as a gas station for storing gasoline or oils.

The resin contained in the glass fiber member is vinyl ester, bisphenol-based resin, or the like .

It is a lineblock diagram of a piping system for explaining oil piping internal lining construction of this embodiment. It is a figure which shows the cross-section of the piping system containing a tank and piping (lubrication pipe | tube). . It is sectional drawing of the AA 'part shown in FIG. It is a figure explaining the process which removes the oil component inside piping. (A)-(c) is a figure explaining the process which removes the rust inside a piping, a weld line burr | flash, etc. FIG. It is a figure explaining a glass fiber member, (a) is a figure which shows the structure of the glass fiber member to be used, (b) attaches the string of predetermined length to the glass fiber member of the said structure, and glass fiber in piping 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 a figure showing the state where the glass fiber member containing the resin of the same length was arranged inside the pipe, and (b) is a spherical shape It is a figure which shows the state just before moving the lining pig in the arrow direction, (c) is a figure which shows the state in the middle of the lining pig moving in the direction of the arrow in the pipe , (d) is a figure by the gas pressure Furthermore, it is a figure which shows the state which the pig for lining moved to the arrow direction, and the pig for lining reached the other end of piping.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining an oil pipe internal lining construction method according to the present embodiment, which is applied to a pipe used when oil (gasoline or the like ) is stored in a buried tank. In this example, as an embedded pipe, an example of an embedded pipe for injecting gasoline or the like into a tank embedded in the basement of a gas station and supplying gasoline or the like from a tank to a vehicle is shown.

In the figure, underground tanks (hereinafter, simply referred to as tank) lubrication tube 2 to 1 to lubricate the oil (gasoline, etc.), filler tube 3 for lubrication oil (gasoline, etc.) from the tank 1, through which performs the ventilation of the tank 1 A level gauge 5 for measuring the level of oil (gasoline etc. ) stored in the trachea 4 and the tank 1 is provided. The tank 1 is buried at a predetermined depth from the ground surface, and concrete 10 is provided on the tank 1.

The oil supply pipe 2 is provided with an oil supply port 6 on the ground surface, and oil (gasoline etc. ) is supplied from the oil supply port 6. The oil supply pipe 3 is provided with equipment 7 such as a meter and a pump on the ground surface, and sucks oil (gasoline etc. ) from the tank 1 and measures the sucked oil (gasoline etc. ). Further, the oil supply pipe 2 is provided with a valve 8, and the oil supply pipe 3 is also provided with a valve 9. When the tank 1 is repaired / refurbished, the valves 8 and 9 are closed. The vent pipe 4 is provided with a vent 4a for exhausting the gas generated in the tank 1.

FIG. 2 particularly shows a cross-sectional structure including the tank 1 and the oil supply pipe 2. As described above, the oil supply pipe 2 is provided with the oil supply port 6, and oil (gasoline or the like ) is supplied from the oil supply port 6, passes through the oil supply pipe 2 (hereinafter simply referred to as the pipe 2), and enters the oil into the tank 1 (gasoline). Etc. ) are stored. FIG. 3 is a cross-sectional view taken along the line AA ′ shown in FIG. 2 and shows the internal state of the pipe 2 used for a long time. As shown in the figure, the pipe 2 has been used for a long time, for example, rust is generated on the inner peripheral surface, and the oil is also thickly attached. In FIG. 3, rust generated on the inner peripheral surface of the pipe 2 and oil adhering thereto are shown as a scale 13.

In the description of FIGS. 5A to 5C, three types of rust removal pigs 16a to 16c having different external shapes are used. However, more rust removal pigs 16 are prepared and the same operation is repeated several times. The operation of removing rust, weld line burrs, and the like inside the pipe 2 may be performed repeatedly.

This glass fiber member 23 has the heat resistance, nonflammability and durability of glass, and the flexibility of the fiber, and the thin fibers are intertwined in a complex manner to form multiple layers of air in the woven fiber. 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 resin such as a resin.

Claims (5)

A first treatment for removing oil from the piping by passing a cleaning pig through the piping using water pressure;
A second treatment for removing rust and burrs inside the pipe by passing a dedicated rust removal pig using gas pressure into the pipe from which the oil inside the pipe has been removed;
A tubular glass fiber member containing a resin is inserted into the pipe from which rust and burrs have been removed, and a predetermined spherical member is passed through the glass fiber member using gas pressure. A third process for performing a lining construction of a certain thickness on the peripheral surface;
An oil pipe internal lining construction method characterized by   2. The oil pipe internal lining according to claim 1, wherein a peripheral surface of the cleaning pig is made of a relatively soft material, and the oil content in the pipe is discharged to the outside of the pipe while adsorbing to the peripheral surface. Construction method.   3. The oil pipe internal lining construction method according to claim 1, wherein a peripheral surface of the rust removal dedicated pig is made of a hard material having a predetermined shape, and rust and burrs inside the pipe are surely removed. .   The lining construction performed through the spherical member in 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 oil pipe internal lining construction method.   5. The oil pipe internal lining construction method according to claim 1, wherein the resin contained in the glass fiber member is a vinyl ester or a bisphenol-based resin.

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