JPS588724B2 - Tank bottom tilt measurement method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for measuring the inclination of the bottom surface of a tank filled with liquid, such as an oil storage tank.

Tanks installed on soft ground may sink or settle unevenly, so it is necessary to frequently measure the settlement and inclination of tanks, etc. that store hazardous materials. be.

Generally, the settling and inclination are measured by observing the height of the tank bottom plate at the bottom of the tank from outside the tank.

In addition, internal liquids may be removed, washed, and then internal surveyed and inspected, but this requires the expense of multiple dogs and the need to stop operation, and in the case of dangerous substances such as oil, it may be dangerous. Because of this, it is not done very often.

Even if the bottom plate is measured and inspected with the interior empty, the shape of the bottom plate is different from when it is filled with liquid, and there may be distortion of the bottom plate due to the liquid load, or plastic deformation of the ground due to gaps between it and the foundation ground or liquid pressure. It is not possible to grasp the actual situation.

In this way, conventionally there was no suitable method for measuring and considering the shape of the bottom of the tank when it is filled with liquid, and the amount of sinking of the tank bottom plate was measured from the outside and the measured values around the tank were compared to determine the unevenness. The reality is that the interior is only checked for subsidence, and only when there is danger, the interior is emptied and inspected.

This invention solves the above-mentioned problems, and its purpose is to provide a device that can measure the inclination of a tank bottom plate when the tank is filled with liquid.

The measuring device of the present invention uses a device main body in which a level meter is installed in which a liquid is injected into a U-shaped tube that connects the lower ends of two vertical tubes with pressure gauges installed at the bottom, and this is installed in a tank. The inclination of the tank bottom is determined by placing the injected liquid on the bottom and moving it while detecting the head pressure difference of the injected liquid due to the inclination of the tank bottom.

According to this device, even if the tank is filled with liquid, by placing the device body on the bottom surface, the slope of the tank bottom surface between the bottom ends of two vertical pipes can be accurately and easily determined as a pressure difference, which was previously impossible. This made it possible for the first time to measure the inclination of the bottom of a tank filled with liquid.

This will be explained below with reference to the illustrated embodiments.

FIG. 1 shows a main body 1 of the device according to the present invention, and its structure includes two parallel vertical pipes 2, 2' separated by a distance L in a vehicle body 6, and pressure gauges 3, 3' at the lower ends. is provided, and vertical pipe 2
, 2' are connected to each other through communication pipes 4, 4' to form a sealed system, and the mercury 5 is removed by leaving a gap inside.
is enclosed to form a level meter.

The entire vehicle body 6 is hermetically sealed, and lead wires 7 connected to pressure gauges 3, 3' extend outside the vehicle body 6, and pressure measuring devices 8, 8' are provided at their tips.

Moreover, wheels 9 for movement are attached to the lower part of the vehicle body 6, so that the vehicle can move freely.

In the measuring device of the present invention, first, the main body 1 of the device is placed in a tank 10 filled with liquid.

For example, the lead wire 7 can be pulled out of the tank through a leak-proof pull-out hole provided near the bottom of the side wall of the tank 10 to enable pressure measurement outside the tank.

In this state, the main body 1 of the device is attached to the bottom surface 11 of the tank.
, and measure the head pressure of the mercury 5 between the distance L between the two vertical pipes 2 and 2'.

When the device main body 1 is located on the inclined bottom surface, the vertical pipes 2, 2
The liquid level of the mercury 4 in the tank is tilted to one side through the communication pipe 4, creating a head difference between the vertical pipes 2 and 2'.The head pressure is measured with the pressure gauges 3 and 3', and The difference is detected by the pressure measuring devices 8, 8' via the lead wires drawn out to determine the inclination between the distance L of the tank bottom surface 11.

In this way, the inclination between the distance L of the bottom surface 11 is determined as a pressure difference, so for example, by moving intermittently from the circumference of the cylindrical tank bottom surface 11 on the diameter of the bottom surface at intervals L, the distance between the bottom surface By determining the slope between L, it is possible to continuously determine the slope along one diameter of the tank bottom.

At the same time, if necessary, measure the position of the tank bottom plate around the tank periphery, and measure the position of the entire bottom of the tank from the inside and outside of the tank.
You can find the slope.

The movement of the main body 1 of the apparatus can be guided via the lead wire 7, or can be guided by hanging from above the tank.

Further, the moving position can be easily determined based on the length of the lead wire 7, the number of rotations of the wheels 8, etc.

In this device main body 1, the lead wire 7 is pulled out outside the tank to read the pressure, but in some cases, the device main body 1
A recording device can be built into the tank to measure and record the pressure difference at each measurement point, and after the measurement is completed, it can be taken out of the tank and the slope can be determined.

This measuring device is as described above; The inclination of the tank bottom is determined by depositing the liquid on the bottom and moving it while detecting the head pressure difference of the injected liquid due to the inclination of the tank bottom.

In this device, the level system is sealed and housed in a sealed vehicle body, so it can be placed inside a tank filled with liquid and safely and accurately measure the inclination of its bottom surface.

This makes it possible to measure the inclination of the bottom surface in a state where liquid is filled and a liquid load is applied to the bottom surface, which has not been available in the past.

It also eliminates the need to empty the tank and measure and inspect the slope of its bottom.

In addition, since this measurement device uses the slope over a relatively short distance L as a unit of measurement, it can easily detect abnormal changes in small parts of the bottom of the tank, allowing for early detection of small abnormalities. This invention makes it possible to easily and accurately measure the slope of the bottom surface by keeping it submerged at the bottom of the tank at all times and moving it periodically or at any time.Flaws in the bottom surface of the tank can be detected early and accidents can be avoided in advance. is extremely valuable in preventing factory accidents, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side sectional view of the main body of the device, Fig. 2 is a side sectional view of the level meter on the inclined tank bottom, and Fig. 3 is a side sectional view of the level meter on the tank bottom. It is a side sectional view showing the state where it is sunk in the bottom. 1... Device main body, 2, 2'... Vertical pipe,
3, 3'...Pressure gauge, 4,4'...Communication pipe, 5...Mercury, 6...Car body, 7...
... Lead wire, 8, 8' ... Pressure measuring device, 1
9...wheels, io--tank, 11...
・Tank bottom, L...Distance between the bottom ends of the vertical pipe.

Claims (1)

[Claims] 1 Inside a sealed vehicle body that can run freely on the bottom of a tank, etc., a pressure gauge is installed at the lower end of two vertical pipes installed at a predetermined interval, and the upper and lower ends of the pipes are communicated with each other to supply liquid within the vertical pipes. A level gauge constructed by injecting and sealing the pressure gauge is installed, and the level gauge is provided with means for detecting the head of the vertical pipe from the pressure gauge outside the vehicle body. Tilt measuring device.