JPS628129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting leakage in a tank storing liquid such as water.

Liquid storage tanks are widely used in various fields including chemical plants, but depending on the internal conditions, it may be necessary to detect and repair leakage points without draining the fluid inside the tank.

For example, austenitic stainless steel is used to store liquids containing substances harmful to the human body that are stored for chemical processing or temporary storage, or liquids containing hazardous substances that may cause an explosion. There is a lined water tank, but if a leak occurs in the situation where liquid containing substances harmful to the human body is stored in the tank, the liquid in the tank should be removed, the leak location should be detected and repaired. There are cases where it is impossible to do so, and even if it is not impossible, it may be difficult to handle. Therefore, in such a case,
There is a demand for a method that enables the detection and repair of leakage points in a storage tank without removing the liquid in the tank, and the present invention was proposed in view of these circumstances. It is an object of the present invention to provide a device that easily detects leakage without discharging it.

That is, the present invention detects a leak by isolating the part where the leak is occurring from other liquid storage spaces, magnifying the leak flow, and measuring the flow velocity with a current meter.

The present invention will be described below based on an illustrated embodiment, but the present invention is not limited to this embodiment.

FIG. 1 is a perspective view showing the entire apparatus of this embodiment.

In the figure, a tank or pool 3 formed by partially shown concrete side walls 1 and a bottom wall 2 is filled with water up to a liquid level 4 shown in dashed lines.

The holding member 10 includes, for example, a fixing base 11 fixed in advance on the bottom wall 2 and a holding column 15 that is fitted and supported by the fixing base 11 and extends above the tank 3. The fixed base 11 is composed of a bottom plate 12 in contact with the bottom wall 2 and a plurality of stop plates 13 arranged in a slatted manner. It is provided at the lower end of the holding column 15. Furthermore, a cable 18 is hooked to the upper end of the holding column 15 and is used for attachment or fixation.

Guide rings 22 surrounding the holding column 15 are provided above and below the detection box 20 connected to the lower end of the wire rope 21 with a scale, protruding from the back surface, and furthermore, the detection box 20 has a substantially U-shaped guide ring 22 on the back surface. The plate 2
4 is provided to receive a retaining post 15.

A steel lining 6 is placed on the surface of the side wall 1, and a detection box 20 facing the lining 6 is placed on the surface of the side wall 1.
A substantially rectangular opening 26 is formed in the surface thereof and surrounded by a sealing member or soft gasket 27 attached thereto. Internal space 28 of detection box 20
When set against the lining 6 as shown, it forms a substantially enclosed space.

Detection nozzle 30 provided on the side of the detection box 20
has a passage 31 of a predetermined shape that communicates the interior space 28 with the outside, and the tip of the detection needle 40 inserted into the nozzle 30 faces the outer end of the passage 31.

A long conducting wire 41 connected to the detection needle 40 is connected to a hot wire current meter 45 placed outside the tank 3.

In this embodiment, which has the above-mentioned configuration and has been set, if the lining 6 has a broken part 8, for example, the water in the detection box 20 will flow through the broken part 8 into the side wall 1 as shown by the arrow. As a result, a water flow from outside the detection box 20 toward the inner space 28 is generated in the passage 31 of the nozzle 30, and the flow velocity is measured by the detection needle 40 and the current meter 45, which the water flow hits. That is, the presence or absence of leakage and its magnitude are detected by measuring the flow velocity of the leakage flow.

To set the detection box 20 as shown, first tilt the holding column 15 as shown by the chain line in FIG. Insert it between the ends and fix its bottom end. Next, the holding column 15 supported by appropriate means
Then, the detection box 20 is lowered into the water with the guide ring 22 fitted and the contact plate 24 facing the holding column 15. If the detection box 20 is light, the detection box 20 is lowered by stretching the rope 21 by hand, but if it is heavy, a lifting device (not shown) may be used to lower the detection box 20.

The position of the detection box 20 is determined by the scale attached to the rope 21, the descent of the detection box 20 is stopped at a predetermined position, and the upper end of the holding column 15 is pulled with the cable 18, and the detection box 20 is pressed against the surface of the side wall 1. , the above-mentioned detection is performed while maintaining the same state. In order to move the detection box 20 to another location and leak the detection box 20, it is sufficient to carry out the removal operation in which the above-mentioned installation operation is performed in reverse order, and then perform the above-mentioned installation operation again. To simply move the detection box 20 in the vertical direction, there is no need to move the holding column 15, and it is sufficient to simply tilt it.

The detection box 20 of the above embodiment is for detecting leakage from the flat part of the side wall 1, but in order to detect leakage from corners and corners, the detection box 120, Select and use 220 and 320 as appropriate,
Those skilled in the art will readily understand that some structural modifications may be made.

As described above, according to the present invention, a detection box placed under the liquid level of the tank partially covers the wall surface and measures the presence or absence of liquid flow in the detection nozzle caused by leakage and the flow rate. The presence or absence of leakage and its size can be easily detected without removing the liquid.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the entire embodiment of the present invention, FIG. 2 is a side sectional view showing the main part of FIG. 1, and FIG. 3 is a sectional view taken along the line - in FIG. FIG. 4 is a perspective view partially showing another embodiment for use in a corner of a tank or the like. 1...Side wall, 2...Bottom wall, 3...Pool, 4...Liquid level,
10... Holding member, 11... Fixing base, 12... Bottom plate, 1
3... Stopping plate, 15... Holding column, 16... Teeth, 17...
Seat, 18... Cable, 20... Detection box, 21... Rope, 2
2... Guide ring, 24... Contact plate, 26... Opening, 27... Gasket, 28... Internal space, 30... Nozzle, 31
...Passway, 40...Detection needle, 41...Conductor, 45...Flowmeter.

Claims (1)

[Claims] 1. A holding member attached by being immersed in the liquid stored in the tank;
A hollow detection box having a hollow detection section and a current meter supported by the holding member and selectively brought into close contact with the wall surface of the tank to cooperate with the wall surface to define a sealed space; and a wall of the hollow detection box. A leak detection device for a tank wall surface, characterized in that the hollow detection section is constituted by a flow velocity detection needle provided in a detection nozzle, and the flow velocity detection needle is electrically connected to the current meter.