JPH042874Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a stripping control device for a single-bottom tank.

BACKGROUND TECHNOLOGY The bottom of a tank with a single bottom structure, such as the bottom of a tanker, usually has a plurality of compartments formed of bottom aggregate such as a bottom longitudinal or a bottom transformer. Conventionally, stripping control when discharging liquid stored in this compartment to the outside of the tank has been carried out by an operator controlling the pumps and valves while watching the ship's tank level gauge, pump pressure gauge, etc. It's summery.

Problems that the invention aims to solve: However, in the case of a single-bottom tank like the one mentioned above, the flow is obstructed by the bottom aggregate, making it difficult to start, control, and detect the end of stripping, and it is difficult to start, control, and detect the end of stripping, and it is difficult to do so based on the operator's experience and intuition. The problem is that it has no choice but to be controlled.

Therefore, an object of the present invention is to enable these controls and detections to be performed automatically and efficiently.

Means for Solving the Problems In order to solve the above problems, the present invention forms a plurality of compartments with bottom aggregate in one tank, communicates these compartments with a drain course, and at least one compartment A bell mouth for suction is installed in the
A bottom liquid level measuring device capable of measuring the liquid level at the bottom of each compartment in the compartment where the suction bell mouth is installed and at least one other compartment, and controlling the stripping flow rate based on the measurement signal. It has been established.

Effect If this is the case, when the liquid level in the tank is sucked up to the height of the bottom aggregate, a difference will occur in the liquid level in each compartment, but this difference will cause a difference in the bottom liquid level measurement. The measurement signal is measured by the device, and the flow rate of the suction amount during stripping can be controlled using this measurement signal.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In Fig. 1, 1 is a tank with a single bottom structure in the hull, and a plurality of compartments 3a, 3 are formed at the bottom by a bottom longitudinal 2 as the bottom aggregate.
b, 3c... are formed. Each section 3a, 3
b, 3c, . . . communicate with each other through a drain course 4 consisting of a semicircular hole. 5 is a bell mouth for discharging the liquid 6 in the tank 1 to the outside, and is opened near the bottom of the compartment 3c. 7 is a suction tube. Section 3 where this bell mouth 5 is installed
c, and at least one other section 3a
are provided with bottom liquid level measuring devices 8C and 8A that can measure the liquid level at the bottom of each compartment 3c and 3a.

In such a configuration, when the liquid level in the tank 1 is sucked up to the height of the bottom longitudinal 2, this is measured by the bottom liquid level measuring devices 8C and 8A, and the switching valve (not shown) for stripping is automatically activated. Operate and start stripping. The liquid level in the compartment 3c where the bell mouth 5 is installed is the bottle longi 2.
When the height is below, each section 3a, as shown in the figure.
Differences appear in the liquid levels La, Lb, Lc... between 3b, 3c... This is because the area of the drain course 4 is limited to some extent due to the strength of the hull.

If suction is continued at this large capacity, the liquid will run out only in the section 3C where the bell mouth 5 is installed, making pump operation impossible. Therefore, the above liquid level
The difference between Lc and La is measured by the bottom liquid level measuring devices 8C and 8A, and the stripping flow rate is controlled by switching to another small capacity stripping device based on the measurement signal. This operation is automatically performed by interlocking the stripping device with the bottom liquid level measuring devices 8C and 8A.

In Fig. 1, if the liquid level La in the section 3a becomes sufficiently small, or if the difference between the liquid levels Lc and La measured by both bottom liquid level measuring devices 8C and 8A becomes small, it is detected that stripping has ended. can.

Effects of the invention As described above, according to the invention, the stripping flow rate can be controlled automatically, so stripping can be performed efficiently.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention. 1...tank, 2...bottom longitudinal (bottom aggregate), 3a, 3b, 3c...compartment, 5...bell mouth, 8A, 8C...bottom liquid level detection device, La,
Lb, Lc...Liquid level.

Claims (1)

[Scope of utility model registration request] In one tank, a plurality of compartments are formed with bottom aggregate, these compartments are communicated with each other by a drain course, and at least one compartment is provided with a suction bell mouth, and the compartment in which the suction bell mouth is installed is , a single-bottom structure characterized in that at least one other compartment is provided with a bottom liquid level measuring device capable of measuring the liquid level at the bottom of each compartment and controlling the stripping flow rate based on the measurement signal. Tank stripping control device.