JPS6220114B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for attaching an anti-corrosion film to the bottom surface of an oil storage tank for gasoline, kerosene, heavy oil, crude oil, etc.

Traditionally, inorganic materials,
Coating methods using organic substances or complexes thereof are known. In order to improve the adhesion of the coating film formed by this coating method to the bottom plate, a surface treatment is performed by blasting. For this reason, when inspecting the bottom plate in the can body inspection stipulated by law, it is necessary to remove the adhering coating film, which not only requires a great deal of labor, but also damages the bottom plate with tools during the process. Something happened. Furthermore, this coating film has poor flexibility and is prone to cracking due to deformation of the bottom plate, which may impair the anticorrosion effect.

On the other hand, when inspecting the coating film for pinholes, it is difficult to detect pinholes because this coating film uses a coating material with low electrical resistance to prevent static electricity from being charged when oil is put in and taken out. The problem was that electrical tests could not be performed. There is also a method of forming a coating film by thermal spraying of aluminum, but this method is also extremely expensive in that it cannot directly inspect the bottom plate surface.

In view of the above circumstances, it is an object of the present invention to provide a method for attaching an anti-corrosion film that can be easily attached and detached to replace the coating film on the bottom plate of an oil storage tank, thereby facilitating inspection of the bottom plate. .

Another object of the present invention is to provide a method for attaching a corrosion-proofing film so that the corrosion-proofing film can be freely attached and removed, thereby making it easy to inspect the corrosion-proofing film itself.

The method of attaching an anti-corrosion film to the bottom of an oil storage tank of the present invention includes coating the bottom of the oil storage tank with an anti-corrosion film, using a packing having an L-shaped cross section at the joint between the peripheral wall of the oil storage tank and the bottom plate,
The horizontal part along the bottom plate of this packing and the peripheral edge of the anti-corrosion film are bonded with adhesive, and the rising part along the peripheral wall of this L-shaped packing is removably fixed to the surrounding wall of the oil storage tank using a shank vise or the like. It is characterized by:

The material for the anti-corrosion film is a composite of cloth and rubber or plastic, which has oil resistance, corrosion resistance, and electrical conductivity that can leak static electricity, and the material for the L-shaped packing is the same as the anti-corrosion film. Use special rubber or plastic.

Further, in order to maintain airtightness between the rising part of the L-shaped packing and the peripheral wall of the oil storage tank, it is preferable to provide a protrusion along the bottom surface of the rising part of the L-shaped packing on the side of the peripheral wall of the oil storage tank.

As described above, the method for attaching the anticorrosion film to the bottom surface of an oil storage tank according to the present invention is to
The horizontal part of the L-shaped packing is glued and integrated, and the rising part of the L-shaped packing is removably fixed to the peripheral wall of the oil storage tank, making it easy to apply an anti-corrosion film when inspecting the bottom plate of oil storage tanks. It can be easily attached and detached, and since the anticorrosion coating and the bottom plate are separated, the anticorrosion coating can be easily inspected.

In addition, if the oil storage tank has a reinforcing plate such as a roof support or drain support attached to the bottom plate,
The anti-corrosion film must be coated on the bottom plate, avoiding the reinforcing plate, and the anti-corrosion film is removably fixed at the edge of the reinforcing plate.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of an oil storage tank in which the bottom surface 1 of the oil storage tank is protected against corrosion by a coating film 2 using a conventional corrosion protection method.

FIG. 2 shows details of the joint between the oil storage tank bottom plate and the peripheral wall according to one embodiment of the present invention. As shown in the figure, the bottom surface 1 of the oil storage tank is covered with an anti-corrosion film 4 made of a composite of rubber or plastic, etc. and cloth.
Cover. For example, the material of this anti-corrosion film 4 is a sheet containing 1 ply of 2.5 mm cloth of nitrile rubber (2 mm surface rubber + cloth + rubber back
0.5mm) hardness (JIS A type) 65±5 is recommended. The outer edge 4a of this anti-corrosion film 4 is placed on the horizontal portion 3a of the L-shaped packing 3 and bonded with an adhesive 5. The vertical relationship of this overlapping may be either, and the appropriate length of the overlapping is about 50 mm. Needless to say, consideration must be given to ensuring sufficient adhesion and airtightness of the adhesive surfaces. The rising portion 3b of this L-shaped packing is strongly pressed through the presser plate 6 by a shear vise 10 consisting of an angle 7, bolts 8, and nuts 9 fixed to the peripheral wall 11 of the oil storage tank. In this case, in order to improve the airtightness between the peripheral wall 11 and the L-shaped packing 3, a protrusion 12 is provided parallel to the bottom surface 1 of the rising portion 3b of the L-shaped packing 3 on the oil storage tank peripheral wall 11 side. Note that in order to prevent the L-shaped packing 3 from deforming and slipping off, the horizontal portion 3a of the L-shaped packing 3 and the bottom plate 1 may be fixed with an adhesive 5. The appropriate pitch for installing the shank vise 10 is 400 mm or less, preferably 250 mm to 30 mm. L-shaped packing 3
As the material, rubber or plastic having the same properties as the anticorrosive film 4 is used, and more specifically, it is preferable to use nitrile rubber, 4 m thick, and hardness (JISA type) 60±5. According to the above mounting method, the anticorrosive film 4 and the L-shaped packing 3 can be attached by simply operating the seal vise 10.
can be easily attached and detached.

FIG. 3 is a plan view showing an example of the anticorrosion film 4 in FIG. 2.

Although only the outer edge 4a and its vicinity are shown in the figure, the anticorrosive film 4 in FIG. 2 has a size sufficient to cover the entire surface of the bottom surface 1 of the oil storage tank. The large anti-corrosion film 4 may of course be formed by a single film, but for example, as shown in FIG. It is also possible to form the anticorrosive film 42. In this case, of course, the inner edge of the surrounding anti-corrosion film 41 and the outer edge of the central anti-corrosion film 42 are joined, and the outer edge of the surrounding anti-corrosion film 41 (this is ultimately the outer edge (peripheral edge) of the above-mentioned anti-corrosion film 4 ) 4a) is joined to the horizontal portion 3a of the L-shaped packing in FIG.

FIG. 4A is a sectional view showing an example of the joint between the peripheral corrosion protection film 41 and the central corrosion protection film 42 in FIG. 5. The vertical relationship of this overlapping may be either, and the appropriate length of the overlapping is about 20 to 25 mm.

FIG. 4B is a cross-sectional view showing another example of the joint between the peripheral anti-corrosion film 41 and the central anti-corrosion film 42 in FIG. A corrosion protection film 43 for reinforcing adhesion (may be made of the same material as the above corrosion protection film) is used, and this is applied to the end surface abutting portions of both the corrosion protection films 41 and 42 with adhesive 5. It is glued together. The width of this anticorrosive film 43 for reinforcing adhesive force is suitably about 50 mm.

5A, 5B, and 5C show an example of covering the bottom plate 1 with the anticorrosive film 4 shown in FIG. 2 when the reinforcing plate 14 for the roof support 13 is attached to the bottom plate in the oil storage tank. As is clear from FIG. 5A, in order to coat the bottom plate 1 with the anticorrosive film 4, the roof support 13 must be avoided. Therefore, a flat washer 15 is welded to the edge of the reinforcing plate 14 welded to the bottom plate 1, the anticorrosive film 4 is covered with the flat washer 15, and the anticorrosive film 4 is clamped with another flat washer 16 and crimped with bolts 17. . In addition, flat washer 15,1
6 needs to be divided into two by the roof support 13. According to this anti-corrosion film attachment method, even if the reinforcing plate 14 of the roof support 13 is attached to the bottom plate 1, the anti-corrosion film 4 can be easily attached and detached.

As explained above, according to the present invention, it is easy to attach and detach the anticorrosive film during inspection of the bottom plate of oil storage tanks, etc., and it is very advantageous in terms of cost. Furthermore, since the anticorrosive film can be easily attached and removed, the anticorrosive film itself can be inspected easily.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an oil storage tank obtained by a conventional corrosion prevention method, Fig. 2 is a cross-sectional view of the joint between the bottom surface of the oil storage tank and the peripheral wall showing one embodiment of the present invention, and Fig. 3 is the anticorrosion film shown in Fig. 2. A plan view showing the whole of an example, No. 4A
Figures 4B and 4B are cross-sectional views showing an example of the corrosion-resistant film joint in Figure 3, and Figure 5A is a partial cross-sectional view showing an example of the case where the bottom surface of an oil storage tank is coated with the corrosion-resistant film shown in Figure 2. FIG. 5B is a plan view of FIG. 5A, and FIG. 5C is an enlarged sectional view of a part of FIG. 5A in detail. 1... Bottom plate, 2... Coating film, 3, 3a, 3
b...L-shaped packing, 4, 4a, 41, 42, 4
3...Anti-corrosion film.

Claims (1)

[Scope of Claims] 1. A method of bonding an anti-corrosion film that covers the bottom inner surface of the oil storage tank to the bottom of the oil storage tank, wherein a rising portion along the lower edge of the peripheral wall of the oil storage tank and a peripheral edge of the bottom surface of the oil storage tank are provided. An oil storage tank characterized in that a rising part of a packing having an L-shaped cross section and a horizontal part along the bottom is removably fixed to the lower part of the peripheral wall, and a peripheral part of the anticorrosive film is adhered to the horizontal part of the packing. How to attach anti-corrosion film to the bottom. 2. The method of attaching a corrosion protection film to the bottom of an oil storage tank according to claim 1, wherein the corrosion protection film is made of a composite of rubber and cloth. 3. The method of attaching a corrosion protection film to the bottom of an oil storage tank according to claim 1, wherein the corrosion protection film is made of a composite of plastic and cloth. 4. The anti-corrosion film for the bottom of the oil storage tank according to claim 1, wherein the packing has a protrusion parallel to the bottom surface of the oil storage tank on the surface of the rising portion on the side of the peripheral wall of the oil storage tank. How to install.