JPS6356A - Double bottom type fuel tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel tank for crude oil, heavy oil, etc.

[Conventional technology]

In conventional fuel tanks for crude oil, heavy oil, etc., the bottom plate is provided in contact with the ground, and a bottom heater for heating is installed in a meandering pattern on the bottom plate.

[Problem that the invention seeks to solve]

The bottom plate of a fuel tank is inspected periodically to prevent fuel oil from leaking due to corrosion, cracks, etc. In this case, it is necessary to inspect not only the upper surface of the bottom plate but also the IIJ corrosion inspection of the lower surface in contact with the ground with t# density.

Additionally, sludge deposited and separated from the fuel oil accumulates on the bottom plate of the fuel tank, so this also needs to be removed prior to periodic inspections.However, as mentioned above, a bottom heater is installed on the bottom plate. There is also the problem that scraping out sludge is extremely difficult.

Therefore, an object of the present invention is to solve the above-mentioned problems by making the bottom plate of the fuel tank double-bottomed.

[Means for solving problems]

In order to solve the above problems, the present invention creates a water chamber between the bottom plate and the partition plate by providing temporary partitions at a required interval on the bottom plate provided in contact with the ground, and also creates a water chamber on the partition plate. An oil storage chamber is formed in the water chamber, and a heater is installed on the bottom plate of the water chamber.

〔Example〕

The fuel tank shown in the drawing has a cylindrical body wall 3 standing on a bottom plate 2 set on the ground 1, a floating ceiling 4 on the top of the body wall 3, and a steam tank on the bottom plate 2. A pipe heater 5 is installed. These structures are similar to those of conventional fuel tanks.

This invention provides a partition plate 6 inside the body wall 3 at a height of about 1 m from the bottom plate 2, forms a water chamber 7 between the bottom plate 2 and the partition plate 6, and forms a water chamber 7 between the bottom plate 2 and the partition plate 6. An oil storage chamber 8 is formed in the upper part. A water supply pipe 9 and a drainage pipe 10 are connected to the water chamber 7, and the water supply pipe S is connected to a supply line 12 via a water pressure adjustment tank 11 installed above the floating ceiling 4. Further, the oil storage chamber 8 is provided with an oil supply pipe 13 and a drainage pipe 14. Further, a level meter 15 is connected to the water chamber 7. The above water chamber 7 and oil storage chamber 8
Each is provided with a manhole 16.17, and each is provided with a transparent cover 18.1S.

Note that the partition plate 6 has a concave central portion to facilitate collection of sludge. Further, support columns for the partition plate 6 are appropriately provided in the water chamber 7. A large number of ultrasonic transceivers can also be attached to the lower surface of the partition plate 6 in a distributed manner. In addition, the ceiling 4 may have a fixed pressure of ↑≮2.For a fuel tank having a configuration of 1° or more, the water chamber 7 is filled with water (including anticorrosion liquid) and then fuel oil is supplied to the oil storage chamber 8. .

The weight of the fuel oil is supported on the ground 1 via the water filled in the water chamber 7 and the bottom plate 2. In this case, the partition temporary 6
The water in the water chamber 7 is heated by the heater 5, and the fuel oil is heated by the heat to maintain a predetermined viscosity.

Further, since the water level in the level meter 15 is substantially proportional to the height of the fuel oil level, it is possible to know the remaining amount of fuel oil and the health of the water chamber 7 from this.

In the above fuel tank, in order to prevent leakage of fuel oil, the bottom surface of the oil storage chamber 8 that should be inspected is the partition plate 6, but during inspection, the top surface is inspected in the oil storage chamber 8, and the bottom surface is not inspected. The inspection is performed from the water chamber 7, and the top surface of the bottom plate 2 is also inspected in the water chamber 7. The bottom plate 2 is the ground 1
As it is in contact with the ground, it remains technically difficult to inspect the bottom surface as in the past, but even if the bottom plate 2 were to have a hole due to corrosion, it would be water in the water chamber 7 that would leak into the ground. Because of this, it is easy to deal with it. When the water pressure in the water chamber 7 decreases due to water leakage, water is supplied through the water pressure adjustment tank 11.
The pressure at the top and bottom of the partition plate 6 is balanced.

In addition, when inspecting the temporary partition 6 without draining the fuel oil and water, it can be done by inspecting the turbidity of the water in the water chamber 7 through the transparent cover 19 of the manhole 16. Furthermore, water leakage from the bottom plate 2 can be detected by an abnormal drop in the level meter 15.

In addition, since sludge accumulates on the upper surface of the partition plate 6,
Sludge removal work is performed inside the oil storage chamber 8.

In addition, in order to know the amount of sludge deposited, as mentioned above,
A large number of ultrasonic transceivers are provided on the lower surface of the partition plate 6, and by emitting ultrasonic waves in the direction of the sludge and receiving reflected waves on the surface layer of the sludge, it is possible to know the overall accumulation distribution of the sludge.

〔effect〕

As described above, the present invention provides a partition plate at the lower part of the body wall, thereby separating the water chamber and the oil storage chamber, and
Since the weight of the fuel oil in the oil storage chamber is supported through the water in the water chamber, the lower surface of the partition plate can be inspected from the water chamber side. Further, since the heater is installed on the bottom plate of the water chamber and the sludge is deposited on the partition plate, the removal work can be easily carried out without being hindered by the heater.

[Brief explanation of drawings]

The drawings are cross-sectional views of the embodiments. 1...ground, 2...bottom plate, 3...
...Body wall, 4...Ceiling, 5...Heater, 6...Partition plate, 7...Water chamber, 8
... Oil storage room, 15 ... Level meter.

Claims (1)

[Claims] By providing partition plates at required intervals on the bottom plate that is in contact with the ground, a water chamber is formed between the bottom plate and the partition plate, an oil storage chamber is formed on the partition plate, and a heater is placed on the bottom plate of the water chamber. A double-bottom fuel tank characterized by being installed with.