KR20060109749A - How to install FRP lining in existing forced oil storage tank - Google Patents

Abstract

assignment

TECHNICAL FIELD This invention relates to the repair process of a buried tank. Specifically, It is proposed the repair method in a tank which performs construction using FRP in an inner wall, and its repair structure.

Resolution

Entering through the opening formed in the embedding tank, for example, when performing the maintenance of the embedding tank 1, after the cleaning process of the embedding tank 1, repairing and repairing the embedding tank 1 are carried out. 1) Lining is carried out by the FRP (prepreg sheet) 11 inside, and by providing in this way, a more reliable repair and correction process of the embedding tank 1 is provided, and various tanks which can be used for a long time are provided.

Description

FRP LINING EXECUTING METHOD IN THE EXISTING STEEL STORAGE TANK}

1 is a cross-sectional view of an embedding tank for explaining a first embodiment.

2 is a cross-sectional view of the embedding tank of the first embodiment after the tank opening.

It is a figure explaining the FRP lining construction process in a tank.

It is a figure explaining the FRP lining construction process in a tank.

(Explanation of symbols for the main parts of the drawing)

1: buried tank 2: oil supply pipe

3: suction pipe 4: vent pipe

5: Creat 6, 7: Valve

8: earth and sand 9: opening

10a, 10b: position 11: FRP

Technical field

The present invention relates to a buried tank, and more particularly, to a method for constructing an FRP lining in an existing forced storage oil buried tank using FRP (Fiberglass Reinforced Plastic).

Background technology

Today, in gasoline stands, underground tanks for oil storage are widely used. However, such underground tanks change with the number of years with long-term use, which may cause corrosion and pitting, leading to oil leakage. However, once the tank is buried, it is difficult to check the corrosion or the formula of the buried tank on the ground.

For this reason, the pressurization test and the pressure reduction test are employ | adopted conventionally in order to investigate the oil leakage of the embedding tank and piping. For example, the valves of the oil supply pipe and the suction pipe of the tank are closed, and other openings such as the vent pipe are also closed, the tank is pressurized or depressurized, and corrosion, chemicals, oil leakage, etc. are checked.

In the above conventional system, the jig for inspection must be manufactured in accordance with the embedding tank, and the apparatus becomes large. Also, workability is bad.

On the other hand, a technique of improving the opening technology of a buried tank today, providing an opening in a tank after embedding, forming a manhole on the opening, and invading into the tank has been proposed. However, the work order or work process in the tank is not clear. In particular, lining construction in a buried tank using FRP (Fiber Reinforced Composite) is not known.

In order to solve the above problems, the present invention proposes an FRP construction in a buried tank, and also proposes a repair and inspection process for a tank when entering the tank from an opening.

According to the present invention, the above object is to measure the flammable gas in the buried tank, to check the concentration of gas in the interior, to inject water into the buried tank, to distribute the organic oil absorbent material, and to the organic oil absorbent material. A process of absorbing the suspended solids and discharging the oil separated into a drainage path through an oil / water separation tank, an opening process of forming an opening in the embedding tank, and an interior of the embedding tank after the opening The organic oil absorbents were dispersed in the sludge, and a 6% emulsified solution diluted with water was added to the surface of the sludge, and the generation of volatile gas was suppressed to be low. A process of collectively disposing together, a process of applying primer coating in the embedding tank, and a process of performing lining construction by FRP in the embedment tank It can be achieved by providing an FRP lining application method in the forced Existing low dielectric buried tank.

According to the present invention, since the inside of the tank is lined and constructed by FRP, reliable embedding tank can be repaired and repaired. Therefore, it is possible to prolong the service period of the subsequent embedding tank.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

FIG. 1: is a figure explaining the lining construction structure in the tank of this embodiment. In the figure, 1 is a buried tank buried underground, such as a gasoline stand, and the buried tank 1 sucks oil (gasoline) from the oil supply pipe 2 into which oil (gasoline) is put, and the buried tank 1 A suction pipe 3 to be used at the time of use, a vent pipe 4 through which the buried tank 1 is aerated, and a measuring port for metering oil (gasoline) (not shown) are provided. In addition, the embedding tank 1 is embedded within a predetermined depth range from the surface, and concrete 5 is installed on the embedding tank 1. In addition, a valve 6 is provided in the oil supply pipe 2, a valve 7 is provided in the suction pipe 3, and the valves 6 and 6 are used when repairing / repairing the embedding tank 1. 7) close and do.

In the embedding tank 1 of the above structure, the FRP lining construction process in the tank containing the opening process of the embedding tank 1 is demonstrated.

First, the flammable gas in the embedding tank 1 is measured. This process checks the internal gas concentration and the presence or absence of leakage oil by the measuring device which is not shown in figure. Here, if there is an abnormality in gas concentration, leakage oil, or the like, this is immediately removed, and the inside of the embedding tank is placed in a safe state.

Next, when safety in the embedding tank is confirmed by the above process, the oil (gasoline) in the embedding tank is taken out. This operation cuts open the piping, such as the oil supply pipe 2 and the suction pipe 3, and removes the oil supply system, inserts a suction hose, for example, an air drive pump or explosion-proof explosion-proof. (Iii) Extracting oil (gasoline) from the tank by means of a pump.

Next, water filling in the embedding tank 1 and dispersion of the oil absorber are performed. As described above, after the oil in the tank is taken out, for example, water is introduced from the oil supply pipe 2 to fill the embedding tank 1 with water. The amount of this water is about half of the capacity of the tank and, after filling, the water reaches the center of the buried tank. After the water filling, organic oil absorbents are dispersed and suspended in the organic oil absorbents. In addition, the water from which the oil is separated is discharged into a drainage path through an oil / water separation tank (not shown).

Next, a hydraulic test of the embedding tank and each pipe is carried out. After the removal of the float is completed, this test is carried out to make the inside of the embedding tank full water, for example, to boost the pressure to 0.7 Kg / m, and to test the embedding tank, the oil supply pipe 2 and the suction pipe 3. And check for oil leakage.

Next, the embedding tank is insulated from each pipe. That is, all the piping connected to the embedding tank is insulated.

Next, blackouts of the openings to be formed in the embedding tank are performed, and temporary fences are installed. In addition, the position of the opening formed in the embedding tank is determined by the structural diagram of the embedding tank. Moreover, after drawing the position of the said opening part, the circumference | surroundings are covered by a temporary fire prevention fence.

Next, the concrete 5 formed on the embedding tank is removed, and excavation work is performed. Here, the position of the concrete 5 is shown particularly 5 'in FIG. This process cuts the concrete 5 'with a concrete excavator along the line which has been drawn, and after cutting, breaks the concrete 5' with a concrete breaker, and the earth ( 8) Dig down.

Next, the anticorrosion coating is removed. That is, the anticorrosion coating applied to the tank in accordance with the opening of the embedding tank 1 is removed.

Next, the opening operation of the embedding tank 1 is performed. This opening is performed with an air cutter, and when the opening operation is completed, the opening operation of the water rod bus is performed. FIG. 2 is a view showing the embedding tank 1 after the series of operations described above and the state in the vicinity thereof. In addition, 9 shown in the same drawing is an opening part.

When the opening operation is completed as described above, the tank cleaning operation is performed. In the tank cleaning operation, the water in the embedding tank 1 is pumped out by an air drive pump or a pressure resistant explosion-proof pump, and discharged through the oil / water separation tank. Then, after draining the water, organic oil absorbents are dispersed in the sludge inside the embedding tank 1, and 6% emulsification solution is added to the surface again, and the generation of volatile gas is extremely low, and the embedding tank 1 Dispose of together with internal cleaning sewage.

When the cleaning operation in the embedding tank 1 is completed as described above, the inspection of the embedding tank 1 is performed. First, the inside of the embedding tank 1 is visually inspected. This visual inspection is performed while sand-blasting or wire brush buffing over the inside of the embedding tank 1, and letting out the surface of a tank main body.

Subsequently, visual inspection is performed over the whole inside of the embedding tank 1, and the position, quantity, etc. of corrosion, a wound | wound, jig | tools, etc. are checked. Here, the formula measurement checks the depth, position, quantity, and the like of the formula found by the naked eye. In addition, the plate | board thickness measurement measures the plate | board thickness of the whole inside, such as a shell and a hard board, by an ultrasonic thickness meter.

Penetration flaw inspection carries out penetration flaw inspection of the damage part, such as the welding line, the nozzle neck welding part, and the crack by visual inspection in the whole tank interior.

Next, the tank is repaired and repaired. When any repair is necessary as a result of the inspection inside the tank and inspection, the concrete repair plan is made as follows according to the situation under the comprehensive judgment including the construction period such as the selection of the repair member, repair method, maintenance measures, and the like. In other words, a repair plan is prepared and executed by an effective plate welding, an over-welding welding, an anticorrosive coating, and other effective methods.

Next, FRP lining construction inside a tank is performed.

For lining construction in this tank, sandblasting is first performed, and then primer coating is performed. And after primer coating, predetermined | prescribed number of plies are laminated | stacked using the prepreg sheet of FRP, and an ultraviolet-ray is irradiated and hardened.

3 and 4 are views showing in detail the lining construction process in the tank, and is a cross-sectional view of the embedding tank (1). The embedding tank 1 is comprised of steel plate, and predetermined repair is implemented as mentioned above. The prepreg sheet of FRP is stuck inside this embedding tank 1. Here, FRP (fiber-reinforced composite material) is a composite material which reinforced plastic, metal, rubber | gum, etc. with high strength fiber, for example, A glass fiber composite material, a carbon fiber composite material, etc. can be used.

Hereinafter, the specific adhesion method of FRP is demonstrated. First, as described above, the primer is applied to the base, and then the prepreg sheet 11 is pasted from a predetermined position on the inner surface of the embedding tank 1 as a starting point. That is, as shown in FIG. 3, the FRP (prepreg sheet) 11 is moved inside the tank 1, starting from the position 10a in the embedding tank 1 showing the cross-sectional shape. Therefore, it pastes 240 degrees around the counterclockwise direction, and sticks to the position 10b.

Moreover, the adhesive agent is apply | coated to the FRP (prepreg sheet) 11 previously, and it peels and uses the FRP (plastic sheet) 11, and in the adhesion to the inner surface of the embedding tank 1, the embedding tank 10 It adhere | attaches so that a gaseous phase may not arise between the inner surface of the and the FRP (prepreg sheet) 11. In addition, the adhesion | attachment operation | movement of the FRP (prepreg sheet) 11 mentioned above is performed sequentially from the one end of the embedding tank 1 to the other end. In this way, the FRP (prepreg sheet) 11 is adhere | attached in the range of 240 degrees of the middle layer and the lower layer of the embedding tank 1.

In this way, when the adhesion of the FRP (prepreg sheet) 11 to the middle layer and the lower layer of the embedding tank 1 is completed, the adhesion process of the upper layer of the embedding tank 1 is performed next. 4 is a view for explaining the adhesion treatment of the upper layer of the embedding tank 1. As shown in the same figure, the FRP (prepreg sheet) 11 is adhere | attached except between the positions 10a-10b by the process mentioned above. Therefore, in order to stick the FRP (prepreg sheet) 11 between them, the adhesion start position of the FRP (prepreg sheet) 11 shall be 10b, and the FRP (prepreg sheet) 11 shall be the adhesion end position 10a. I put it up). That is, the FRP (prepreg sheet) 11 is adhere | attached around a counterclockwise circumference, and the FRP (prepreg sheet) 11 is adhere | attached in the range of 120 degrees of the upper layer of the embedding tank 1.

By performing an adhesion | attachment process as mentioned above, the FRP (prepreg sheet) 11 is adhere | attached on the whole peripheral surface of the embedding tank 1. Finally, the above-described FRP (prepreg sheet) 11 is irradiated with ultraviolet rays to cure the FRP (prepreg sheet) 11.

Thereafter, the manhole is attached and the like, and after the inspection opening is completed, all the openings of the embedding tank 1 are sealed. As mentioned above, according to this embodiment, it enters into the tank from the opening part 9 of the embedding tank 1, performs the lining construction process of the FRP shown in FIGS. 3 and 4, and repairs the embedding tank 1, Since water is repaired, corrosion, formula, oil leakage, etc. of a buried tank can be reliably repaired.

In addition, after the repair and repair by this example, the embedding tank 1 deteriorates in the elapsed years, but the progress of the deterioration is delayed by the construction of the FRP, and the embedding tank 1 can be used for a long time.

In addition, although the construction of the lower layer of 240 degrees was performed in the description of this example, the FRP 11 may not necessarily be 240 degrees. In addition, the construction of the upper layer may be performed in the remaining range.

In addition, although the lining construction by FRP was demonstrated in the description of embodiment mentioned above, the process of apply | coating FRP to the inner wall of a tank using a brush etc., or the process of spraying FRP to the inner wall of a tank, is carried out in the embedding tank. It is good also as a structure which forms the layer of FRP.

Here, the process of apply | coating FRP to the inner wall of a tank using a brush etc. is a process which an operator apply | coats FRP to the inner wall of a tank with a roll brush or a hair brush, for example. In addition, the process which injects FRP to the inner wall of a tank is a process which injects a flow-type FRP to the inner wall of a tank, for example with a gun spray pressurized by a compressor by an operator.

Also in this process, a layer of FRP can be formed in the inner wall of the embedding tank 1, and the repair and repair of the embedding tank can be performed reliably.

According to the present invention, since the inside of the tank is lined and constructed by FRP, reliable embedding tank can be repaired and repaired. Therefore, it is possible to prolong the service period of the subsequent embedding tank.

Claims (4)

A process of measuring the flammable gas in the embedding tank and confirming the concentration of the internal gas; Injecting water into the buried tank, dispersing the organic oil absorbent, absorbing the suspended solids in the organic oil absorbent, and discharging the oil separated into the drain through the oil / water separation tank; An opening treatment for forming an opening in the embedding tank, The inside of the buried tank after the opening was cleaned, organic oil absorbents were dispersed in the sludge, and a 6% emulsion solution diluted with water was added to the surface thereof, and the generation of volatile gas was suppressed to be low, and With batch disposal treatment, A process of applying primer coating in the embedding tank, A process for performing lining construction by FRP in said embedding tank. A method for constructing an FRP lining in an existing forced oil storage tank. The method of claim 1, Said lining construction process, The first and the lower part of the embedding tank is lined with the said FRP, Secondly, the upper part of the embedding tank is lined by FRP, The FRP lining construction method in the existing forced oil storage buried tank. The method of claim 2, The process of lining the lower part and the intermediate part of the said embedding tank by said FRP lining the range of 240 degrees of the said embedding tank by said FRP, The FRP lining construction method in the existing forced oil storage tank. A process of measuring the flammable gas in the embedding tank and confirming the concentration of the internal gas; Injecting water into the buried tank, dispersing the organic oil absorbent, absorbing the float in the organic oil absorbent, and discharging the oil separated into the drainage through the oil / water separation tank; An opening treatment for forming an opening in the embedding tank, The inside of the buried tank after the opening was cleaned, organic oil absorbents were dispersed in the sludge, and a 6% emulsified solution diluted with water was added to the surface thereof to suppress the generation of volatile gas, and the washing sewage in the buried tank was With batch disposal treatment, A process of applying primer coating in the embedding tank, A process for carrying out coating by FRP in the embedding tank is performed.

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