JPH09174011A - Cleaning of inside of tank and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save labor for a cleaning operation and increase a cleaning efficiency by the help of injection by inserting a cleaning hose with a lower and a lateral injecting nozzle into a tank in a suspended fashion and rotating the cleaning hose up and down while injecting a high-pressure jet current from each of the injecting nozzles, and at the same time, controlling the flexibility angle of the hose through the adjustment of a jet current pressure and a jet current discharge amount. SOLUTION: A suspension mechanism is installed on the top of a tank T, so that a cleaning hose 2 is suspended while descending in the tank T. Further, a high-pressure jet current is ejected from each of the lower injecting nozzle 31 and the lateral injecting nozzle 41, while rotating the hose 2. In addition, a pollutant is stripped off and cleaned in the tank T while giving directivity to a high-pressure injecting nozzle by controlling the flexibility angle of the cleaning hose through the adjustment for increase/decrease of an injecting pressure and a discharge amount. The base part of the cleaning hose 2 is rotated as the hose 2 becomes flexible obliquely, and thus is given directivity without rotating its tip itself and a lower injecting nozzle 31 travels along the periphery of the internal wall of the tank T. On the other hand, a lateral injecting nozzle 41 makes a circular motion toward the bottom face of the lateral injecting nozzle 41.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a crude oil storage tank,
TECHNICAL FIELD The present invention relates to a method and apparatus for cleaning a tank, which cleans and cleans the inner wall of a tank by peeling and removing wastes and sludge that settle or accumulate in a large storage tank such as a chemical tank.

[0002]

2. Description of the Related Art Many large storage tanks such as crude oil storage tanks are required to be inspected once every 5 to 7 years. About 30 cm of sludge accumulates in one year.

[0003] Conventionally, in order to remove this kind of precipitate and to clean the aged contamination, an operator enters the tank from which the contents have been removed, removes the precipitate using a working tool such as a scoop, and then sprays pressure water. It was by hand to wash away contaminants with a handgun.

[0004]

Cleaning by such manual labor is a labor-intensive work that is covered with oil, and the limit of the injection reaction force for a worker with a handgun is about 15 Kgf. Therefore, the cleaning effect by the injection is extremely weak.

Further, since the manhole for entrance and exit provided on the tank cover is about 600φ, it was impossible to carry a large-sized device into the tank for cleaning.

[0006]

SUMMARY OF THE INVENTION The present invention is designed so that the above manual cleaning can be efficiently carried out by mechanical work, and a plurality of flow paths are provided from the upper part of the tank from which the contents are extracted. Then, a washing hose with a lower jet nozzle and a side jet nozzle opened from separate flow passages at the tip is suspended and inserted into the tank. By adjusting the jet pressure and the jet discharge amount in the passage to increase or decrease, the deflection angle of the hose is manipulated to give directionality to the high-pressure jet nozzle, and the contaminants in the tank are peeled off and washed.

Further, a muddy water treatment device is connected to the discharge port of the content extraction hole provided at the bottom of the tank so that the treated water is circulated to the supply path as the cleaning material water so that the treated water is reused. It was also designed to be useful for transporting the removed substance.

Furthermore, the nozzle portion of the jet jet used for cleaning is monitored, and different nozzle monitors are used depending on the situation of the portion to be cleaned.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 is a main body of a suspension mechanism for the cleaning hose, which is a frame body for installing and fixing the main body in the manhole of the tank cover A
It is supported by 11, and the lower end is a fitting portion 12 for fitting the base portion of the cleaning hose 2.

At the upper end of the suspension mechanism 1, a swivel 3 for connecting the flow passage communicating with the cleaning nozzle 31 provided at the tip of the cleaning hose 2 and the super high pressure water supply hose 32, and the cleaning hose 2 are rocked and inclined. The swivel 4 which connects the flow path communicating with the lateral jet nozzle 41 to be bent with the high pressure water supply hose 42 for tilting.
Is equipped as a multi-tube swivel.

A television camera 6 is installed above the cleaning hose fitting section 12 to inform the operating section 5 of the status of cleaning the inside of the tank by the cleaning hose 2.

At the tip of the cleaning hose 2, a side injection nozzle 41 for tilting the hose 2 is opened, and a monitor mounting portion for removably mounting the monitor of the cleaning nozzle 31 under the side injection nozzle 41.
21 is formed, and if necessary, the monitor can be provided with jet ports for surfactants, detergents, etc. by means of multiple channels.

Although the cleaning nozzle monitor is of a downward injection type, it is attached to and detached from the cleaning hose 2 in addition to a monitor such as a centralized injection nozzle 3a for crushing deposits and a fan-shaped diffusion jet nozzle 3b for separating wall surface contaminants. Via swivel 33,
Multiple nozzle tips 35 planted at an angle at the bottom,
An efficient cleaning effect can be obtained by using the scraping monitor 3c equipped with the rotating casing 34 having 35.

In the ultra high pressure water supply path 7 for cleaning,
The fresh water supplied from the fresh water tank 71 is pressurized to 400 to 2000 Kgf / cm ² by the 200-horsepower ultra-high pressure pump 72 and jetted from the cleaning nozzle 31 at a discharge rate of 100 to 20 L / min.

On the other hand, in the high-pressure water supply path 8 for bending the hose, a turbid water treatment device 82 is connected to a content extraction hole 81 provided at the bottom of the tank T to be cleaned, and the inside of the tank is cleaned and polluted. The cleaning water is collected in the processing device 82 through the extraction hole 81, is precipitated and filtered, and is supplied to the 300-horsepower high-pressure pump 83.

The high pressure water for tilting is supplied to the
It is pressurized to 100 Kgf / cm ² and ejected from the tilting nozzle 41 at a discharge rate of 200 to 600 L / min.

The tilting operation of the cleaning hose 2 is performed by the tilting nozzle.
It was confirmed by the applicant's experiment that the combined force of the injection from 41 and the injection from the cleaning nozzle 31 is used, and the following approximate value calculation formula holds during that time.

That is, the nozzle reaction force represented by Kg is a value obtained by multiplying the injection pressure Kgf by the square of the nozzle diameter mmφ and 1.5 and dividing by 100, and the discharge amount L / min is the square root of the injection pressure Kgf. It is calculated by multiplying by the square of the nozzle diameter mmφ and 0.6.

When calculated by this approximate value calculation formula, 40
When 0Kgf / 100L, the injection reaction force is 54Kg, and when 100Kgf / 600L, the injection reaction force is 150Kg.Therefore, apply 400Kgf / 100L discharge amount and injection pressure to the lower injection nozzle for cleaning, When a discharge amount and injection pressure of 100 Kgf / 600 L are applied to the nozzle, the cleaning hose 2 is pulled and bent by the combined force P of 54: 150.

From this relationship, the lower injection nozzle for cleaning has an injection pressure of 400 kgf / cm ² and a discharge rate of 100 L / min and an injection pressure of 200 L / min.
The specifications were set so that the discharge rate was about 20 L / min at 0 Kgf / cm ² , and the selection was made according to the conditions to be cleaned.

The lateral nozzle for tilting the cleaning hose has a nozzle diameter of around 10 mmφ and a discharge amount of 600 L at an injection pressure of 100 Kgf / cm ^2.
The specification was set from / min to an injection pressure of 10 Kgf / cm ² and a discharge rate of about 200 L / min, and the selection was made according to the required degree of tilt.

As the cleaning hose 2, a wire braid or a wire spiral rubberized was used, and a tank having a height of 30 meters and a diameter of 40 meters was assumed to be cleaned.

The present invention has the suspension mechanism 1 set as described above.
Is installed on the manhole of the cover lid A of the tank T, whereby the washing hose 2 is suspended in the tank, and the lower injection nozzle 31 and the side injection nozzle 41 are rotated while rotating the hose 2.
High-pressure jets are jetted from each of them, and the deflection angle of the washing hose 2 is manipulated by adjusting the respective jetting pressures and the discharge amounts thereof to control the high-pressure jet nozzle to direct the high-pressure jet nozzle to remove and clean the contaminants in the tank. It is a thing.

The rotation of the hose 2 rotates to the tip when the hose hangs down and gives directionality only to the side jet nozzle 41, but as the hose is tilted, the rotation of the hose base causes the tip itself. The directional control is given to the lower injection nozzle 31 without rotating it, the lower injection nozzle 31 goes around the inner wall of the tank T, and the side injection nozzle 41 makes a circular motion toward the bottom surface.

Therefore, the contaminants on the peripheral wall scraped off by the lower injection nozzle 31 are conveyed by the side injection nozzle 41 to the extraction hole provided at the center of the bottom surface of the tank, and the inner surface can be cleaned thoroughly.

[0026]

[Brief description of the drawings]

FIG. 1 is an overall side view showing a cleaning construction situation and a system system according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a cleaning hose suspension mechanism.

FIG. 3 is a side view showing an example of a concentrated injection nozzle monitor.

FIG. 4 is a side view showing an example of a fan-shaped diffusion jet nozzle monitor.

FIG. 5 is a perspective view showing an example of a scraping nozzle monitor using a nozzle rotating system.

FIG. 6 is a side view of the tip of the cleaning hose showing the relationship between the injection reaction force of the downward injection and the injection reaction force of the side injection.

[Explanation of symbols]

1 Cleaning hose suspension mechanism 11 Suspension mechanism installation frame 12 Cleaning hose base joint 2 Cleaning hose 3 Lower jet nozzle mediating swivel 3a, 3b, 3c Down jet nozzle monitor 31 Down jet nozzle 32 Ultra high pressure water supply hose 33 Scratch Rotating swivel for drop nozzle monitor 34 Rotating casing for scraping nozzle monitor 35 Implanting nozzle for scraping nozzle monitor Nozzle tip 4 Side jet nozzle intermediate swivel 41 Side jet nozzle for hose tilt 42 High pressure water supply hose for tilt 5 Suspension mechanism operation unit 6 TV camera 7 Ultra-high pressure water supply route for cleaning 71 Fresh water tank 72 Ultra-high pressure pump 8 High-pressure water supply route for hose tilt 81 Removal target tank contents removal hole 82 Turbid water treatment device 83 High pressure pump A Tank cover T Cleaning target tank P Synthetic power

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[Procedure amendment]

[Submission date] January 9, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

That is, the nozzle reaction force represented by Kg is 100 when the injection pressure Kgf / cm ² is multiplied by the nozzle diameter mmφ squared and 1.5.
The discharge rate L / min is the injection pressure Kgf / cm ²
It is calculated by multiplying the square root of by the square of the nozzle diameter mmφ and 0.6.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

When calculated by this approximate value calculation formula, 40
At 0Kgf / cm ² and 100L / min, injection reaction force is 54Kg , 100Kgf / c
The injection reaction force is 150 Kg at m ² and 600 L / min , so 400 Kgf / cm ² and 100 L / min injection pressure are applied to the lower injection nozzle for cleaning.
Applying the discharge amount , 100Kgf / cm ² , 600L for the side nozzle for tilting
When the injection pressure and the discharge rate of / min are applied , the cleaning hose 2 has 54 pairs.
It is pulled and tilted by the synthetic force P of 150.

Claims (6)

[Claims] 1. From the top of the tank from which the contents have been removed,
A washing hose equipped with a lower jet nozzle and a side jet nozzle, which have multiple flow passages and open from separate flow passages at the tip, is suspended and inserted into the tank, and is rotated up and down while jetting a high-pressure jet from each jet nozzle. In addition to increasing and decreasing the jet pressure and the jet discharge amount in each flow path, the deflection angle of the hose is operated to direct the high-pressure jet nozzle to direct and remove the contaminants in the tank. How to clean the inside of the tank 2. The inside of the tank according to claim 1, wherein a turbid water treatment device is connected to an outlet of a content extraction hole provided at the bottom of the tank, and the treated water is circulated as a cleaning material water to a supply path. Cleaning method 3. A high pressure pumping mechanism having a rotating mechanism and an elevating mechanism, the base of a cleaning hose having a plurality of flow passages and provided with a downward jet nozzle and a side jet nozzle that are opened at separate passages at the tip. A cleaning device for the inside of a tank, which is supported by a suspension mechanism that communicates with the material tank. 4. The cleaning device for the inside of a tank according to claim 3, wherein the injection nozzle at the tip of the cleaning hose is configured as a replaceable nozzle monitor so that a plurality of kinds of injection nozzles can be used. 5. A television camera for sending an image to an operation portion is provided at a required portion of the washing hose suspension mechanism.
Alternatively, the tank cleaning device according to claim 4. 6. A nozzle monitor for cleaning inside a tank, comprising a detaching mechanism for attaching to and detaching from a washing hose via a swivel, and equipped with a rotating casing having a plurality of nozzle tips implanted at an angle thereunder.