JPS6037355Y2 - Leak detection device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a leak detection device, which detects leakage detection installed in the drain when a crack or breakage occurs in the drain pipe connecting the floating roof of a floating roof tank and the drain outside the tank. An object of the present invention is to provide a leak detection device configured to detect an abnormality using a device and automatically shut off a drain pipe.

2. Description of the Related Art A floating roof tank, for example, is generally known as a tank for storing oil and the like.

A floating roof tank has a structure in which the floating roof moves up and down depending on the liquid level in the tank.
To drain rainwater collected on the roof out of the tank,
There is a drain pipe inside the tank that connects the roof to the drain outside the tank.

Typically, this type of drain pipe is a flexible pipe that can expand and contract with the displacement of the roof, and is more susceptible to damage and cracks than fixed pipes.

Additionally, if a universal joint is used in the drain pipe, the seals such as O-rings used in the universal joint may deteriorate, and the drain pipe system may leak oil from the tank into the drain pipe. Abnormalities are likely to occur.

However, in the past, even if a large amount of oil leaked into the drain,
Abnormalities in drain pipes are often not noticed, and a delay in detecting the abnormality can lead to a fire accident, or even if the abnormality is discovered relatively early, the drain pipes are only equipped with manual on-off valves. This method has disadvantages such as it takes too much time to close the drain pipe.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

The figure shows a schematic configuration diagram of an embodiment of the leakage detection device according to the present invention.

In the figure, the leakage detection device 1 is configured to automatically stop the leakage when the oil stored in the floating roof tank 2 leaks into the rainwater drain 3 at the same time as the leakage is detected.

In this embodiment, the floating roof tank 2 stores oil in a cylindrical tank 2a with an open upper end, and a roof 2b having a size approximately equal to the opening of the tank 2a stores the oil. It floats on the liquid level and moves up and down with the liquid level.

Rainwater collected on the upper surface of the floating roof 2b flows into a stretchable drain pipe 5 from a drain port 4 formed at a suitable location on the floating roof 2b, and flows into a drain groove 3 via a drain pipe 6 fixed near the bottom of the tank 2a. drained inside.

Reference numeral 7 denotes a leak detector installed in the drain 3, which detects an oil film on the surface of the rain water and outputs a leak detection signal when oil liquid is mixed in the rain water drained into the drain 3.

The leak detection signal outputted from the leak detector 7 in this way is
After being converted into a predetermined current signal by an explosion-proof converter 8, the signal is supplied to a control circuit (not shown) of a control box 10 in the management office via a signal line 9.

As a result, the leak alarm buzzer 11 and the leak alarm lamp 12 provided in the control box 10 are activated simultaneously to warn that a leak has been detected, and the emergency shutoff valve 13 is activated by a signal from the control circuit. do.

This emergency shutoff valve 13 is attached to the drain pipe 6, and has a valve body drive unit 13a such as a plunger solenoid mechanism.
is connected to a control circuit in the control box 10 via a signal line 14.

As described above, in the leak detection device 1 having the above-described configuration, when oil liquid is mixed in the rainwater drained into the rainwater drain 3, the leakage detector 7 is activated and an alarm is issued.

Therefore, for example, a crack that occurs in the drain pipe 5 in the tank 2a,
Alternatively, an alarm such as a buzzer 11 or a lamp 12 can easily notify that the oil in the tank 2a has leaked into the drain pipe 5 due to a seal failure of a universal joint (not shown) installed in the drain pipe 5. You can know.

Moreover, since the emergency shutoff valve 13 is activated and the drain pipe 6 is shut off together with the operation of the leak detector 7, the oil liquid etc. leaked into the drain pipe 5 will not be discharged any further.

Therefore, it is possible to reliably prevent an accident in which a large amount of oil leaked into the rainwater drain 3 ignites and causes a fire.

In the above-mentioned embodiment, the liquid stored in the tank 2a is not limited to oil, but may be any other liquid other than quince.

In addition, as an example, the emergency shutoff valve is one that is driven to close by an electric signal, but it is not limited to this, and may also be one that is driven by an oil chamber pressure signal, or even one that is driven by an oil chamber pressure signal. It is also possible to use a structure that has a built-in source and is driven by the gas generated when the gas source is activated by a signal from a control circuit.

As mentioned above, in the leak detection device according to the present invention, if the liquid in the tank mixes with the rainwater drained into the rainwater drain, the leak detector is activated and an alarm is issued. There was a crack in the drain pipe that connects the floating roof and the drain, and the liquid in the tank leaked into the drain pipe through the crack, or the seal of the universal joint used for the drain pipe deteriorated, causing a seal leak. You can easily know if there is an abnormality in the drain pipe system due to some reason, and furthermore, when the leak detector is activated, the emergency shutoff valve installed at the appropriate place in the drain pipe closes and the drain pipe is shut off. It has the advantage of being able to prevent further leakage of the liquid in the tank, thereby reliably preventing the occurrence of fire accidents, etc.

[Brief explanation of the drawing]

The figure is a schematic configuration diagram of an embodiment of the leakage detection device according to the present invention. 1... Leak detection device, 2... Floating roof tank, 2a... Tank, 2b...
...Roof, 3...Rainwater drain, 5,6
...Drain pipe, 7...Leak detector, 13
...Emergency shutoff valve.

Claims (1)

[Scope of utility model registration request] A liquid storage tank having a floating roof, and a drain pipe provided inside the tank by connecting the floating roof of the tank and a drain groove outside the tank, and draining rainwater etc. accumulated on the upper part of the floating roof to the drain groove. , a leak detector that detects whether liquid in the tank has leaked into the drain pipe; and a valve that is installed near the outlet of the drain pipe and is driven to close by a leak detection signal from the leak detector to close the drain pipe. A leak detection device consisting of a shutoff valve that shuts off.