JPS6243567Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a disaster prevention device that performs emergency shutoff in the event of an abnormality such as an earthquake in a facility that handles hazardous materials such as liquefied petroleum gas. The present invention relates to a disaster prevention device for hazardous materials facilities that enables easy and reliable inspection of piping paths to the load side.

The inventors of this application are concerned that damage to hazardous materials facilities, such as LP gas supply facilities, caused by a major earthquake may cause
In order to reliably prevent the next disaster from occurring, instead of the conventional low-pressure shut-off valve, an emergency shut-off valve is connected directly to the outlet of the gas container. We have proposed a disaster prevention device that closes the container valve by supplying shutoff gas pressure by opening the startup valve, thereby blocking the outflow of LP gas from the gas container.

According to such a disaster prevention device, gas leakage is prevented even if either the high-pressure or low-pressure piping is damaged, and extremely high safety is guaranteed.

By the way, during restoration work after an emergency break due to an earthquake, inspection work must be carried out to check whether there are any cracks or looseness in the pipes. Using gas can be dangerous if damage has occurred to the pipeline.

This invention was made in view of the above, and in order to easily and reliably perform inspection work on piping lines for recovery after an abnormality occurs, a shutoff gas used for emergency disconnection of gas containers is used. It is an object of the present invention to solve the above-mentioned problems by making it possible to supply the gas pressure of the container to the piping path to the load side.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the disaster prevention device of the present invention used in an LP gas supply facility.

First, to explain the configuration, a plurality of gas containers 1 are filled with LP liquefied gas, and at the top of each gas container 1, there is a container valve 2 for emergency shutoff.
is directly connected, and is open during normal times to allow LP gas to flow out. High-pressure gas from the gas container 1 is collected into a high-pressure pipe 4 via a base valve 3, reduced to medium pressure by an automatic switching regulator 5, and further reduced to a low pressure of around 300 mmH ₂ O by a low-pressure regulator 6. ,
It is supplied to each house via low pressure piping 7. still,
8 is a high-pressure pressure gauge, 9 is a medium-pressure pressure gauge, and 10 is a low-pressure pressure gauge.

On the other hand, as a device for urgently shutting off the container valve 2, a shutoff gas container 1 filled with a shutoff gas, for example, a nonflammable gas such as carbon dioxide gas or nitrogen gas, is used.
1 is provided, and a starting valve 12 is connected to this shutoff gas container 11, which is opened by energization when an abnormality is detected and supplies shutoff gas to each container valve 2 via a shutoff gas supply pipe 13. The starting valve 12 is energized from the control panel 14.

Note that the shutoff gas container 11 has a self-pressure or filling pressure that is higher than the internal pressure of the gas container 1 (15.6 kg/cm ² ).

The control panel 14 is supplied with commercial power during normal times, and switches to emergency power from a battery in the event of a power outage. It also has a built-in seismic sensor as an abnormality detection sensor, and when a predetermined seismic intensity, for example, seismic intensity 3, the external An alarm activation signal is output when the seismic intensity exceeds 5, and the starting valve 12 is energized. In addition to the seismic sensor, the abnormality detection sensor may receive a detection signal from a gas leak sensor installed indoors to energize the starting valve 12, for example.

On the other hand, the starting valve 1 connected to the shutoff gas container 11
On the secondary side of 2, in addition to the cutoff gas supply line 13 connected via a stop valve 15 and shown by a broken line, there is also a low pressure pipe connected to each door via a stop valve 16, a pressure regulator 17, and a check valve 18. An inspection gas pressure supply pipe 19 connected to the line 7 is provided, so that gas leakage can be detected using an inspection pressure gauge 20. Note that a three-way switching valve may be provided instead of the stop valves 15 and 16.

Further, when the pressure sensor 21 connected to the cutoff gas supply pipe 13 reaches a gas pressure sufficient to cut off the container valve 2, the pressure sensor 21 outputs a pressure detection signal to the control panel 14 and is activated. The electricity supply to the valve 12 is stopped to prevent the filling gas in the cutoff gas container 11 from being consumed more than necessary.

Of course, the control panel 14 allows the starting valve 12 to be opened and closed by manual operation.

FIG. 2 shows a cross-sectional view of an embodiment of the container valve 2 used in the embodiment shown in FIG. It has the function of shutting off and stopping the outflow of LP gas, and self-maintaining the shut off state even if the gas pressure supply is cut off after this shutoff.

That is, the container valve 2 has a connection port 23 in the lower body 22 for directly connecting the container valve 1 to the gas container.
and a connection port 24 to which high-pressure piping is connected, and a valve seat 26 is provided on the side of the connection port 23 that communicates with the inside of the valve chamber 25.
Furthermore, a safety valve 27 is provided which releases gas when the pressure inside the gas container exceeds a predetermined value (20 to 24 kg/cm ² or higher).

The upper body 28 screwed onto the lower body 22 has a conduit connection bushing 30 equipped with a cutoff gas supply port 29 to which a cutoff gas supply pipe is connected, and a conduit connection bushing 30 that is pressed by a spring 31 to connect the cutoff gas supply port 29 to the cutoff gas supply pipe.
A check valve consisting of a valve body 32 that closes the valve, a piston 35 supported by a spring 34 and slidably provided in a pressure accumulation chamber 33 for shutoff gas, and a piston 35 fixed to the piston 35 and attached to the valve seat 26 at the lower end. A valve member 37 having a seat gasket 36 to be seated, and a gland nut 3
A spindle 40 which is screwed into the pressure chamber 8 and moves up and down by the rotation of the handle 39, and a return valve 41 for releasing the shutoff gas filled in the pressure accumulation chamber 33 are provided.

In such a shutoff operation of the container valve 2, when the shutoff gas pressure is applied, the valve body 32 is pushed against the spring 31, the shutoff gas is introduced into the pressure accumulation chamber 33, and this gas pressure causes the piston 35 to is spring 3
4, the seat gasket 36 of the valve member 37 seats on the valve seat 26 and blocks the flow path of the LP gas. Once the shutoff is performed, as shown in FIG. 3, even if the supply of shutoff gas is cut off, the gas pressure in the pressure accumulator 33 is maintained by closing the valve body 32, and the container valve 2 self-maintains the cut-off state.

To cancel this shut-off state, when the pressure portion 41a of the return valve 41 is pressed with a finger or the like, the valve opens and the gas in the pressure accumulation chamber 33 is removed, returning the closed state.

Next, the operation will be explained with reference to FIG.

First, in the normal gas supply state, the stop valve 15 provided on the secondary side of the starting valve 12 is open, and the stop valve 16 is closed.

In this state, when the control panel 14 receives an abnormality detection signal from either the seismic sensor, gas leak sensor, or manual operation, the control panel 14 energizes the start valve 12 to open it and shut off the shutoff gas container 11. Gas supply pipe 13 for shutting off gas
The gas is supplied to each container valve 2 through the LP gas to instantly pressurize it, and as shown in FIGS. 2 and 3, the container valve 2 is actuated by the gas pressure to urgently cut off the supply of LP gas.

At this time, the pressure sensor 21 detects the shutoff gas pressure applied to the container valve 2, and when a predetermined shutoff pressure is obtained, it outputs a detection signal to the control panel 14, and the control panel 14 turns on the power to the starting valve 12. stop and close. Therefore, the shutoff gas in the shutoff gas container 11 is not used more than necessary, and there is sufficient remaining amount for inspection.

Next, we will explain how to check for leaks in the piping after the container valve 2 is urgently shut off and before restoration.

This confirmation work is performed from the gas container 1 to the low pressure regulator 6.
The high-pressure side up to the stop valve 42 provided on the secondary side of the pipe and the low-pressure pipe 7 beyond the stop valve 42 are carried out separately.

First, a leak test on the high pressure side is performed on the container valve 2 of each gas container 1, which is in a shut-off state due to gas pressure, as shown in Figure 3.
Turn the handle 39 of the stop valve 42 to press the valve member 37 with the spindle 40 to the closed state.
will be closed. Next, the return valve 41 of the container valve 2 provided in any one of the plurality of gas containers 1
(see Fig. 3) to exhaust the shutoff gas from the pressure accumulation chamber 33, and slightly rotate the handle 39 of the container valve 2 to fill the pipe up to the stop valve 42 with gas.
Check for leakage using the high pressure and medium pressure pressure gauges 8 and 9.

Next, a leakage test is performed on the secondary side of the stop valve 42, that is, the low pressure piping 7.

First, the stop valve 1 provided in the shutoff gas supply pipe 13
5 is closed, the stop valve 16 provided on the inlet side of the inspection gas pressure supply pipe 19 is opened, and the start valve 12 is energized and opened by manual operation of the control panel 14.
Therefore, nonflammable gas is supplied from the shutoff gas container 11 to the low-pressure pipe 7 through the inspection gas pressure supply pipe 19 shown by the broken line.

This supply gas pressure is reduced by the regulator 17 to a gas pressure of around 300 mmH ₂ O for general daily consumption equipment, and the same gas pressure as in normal use is applied to the low-pressure piping. .

The gas pressure in the low-pressure piping 7 due to filling with inert gas can be confirmed using the low-pressure pressure gauge 10 and the inspection pressure gauge 20, and if no pressure drop is observed after a predetermined period of time, there is an abnormality in the low-pressure piping 7. On the other hand, if there is a pressure drop, this indicates that the piping is damaged or the gasket was forgotten to be tightened, so continue supplying inert gas and check for leaks. . In this case, even if gas pressure is continued to be supplied, the gas being filled is a non-hazardous inert gas, so safety is ensured even if it takes time to find the leak.

Note that the location of the leak may be confirmed using a gas detector for the inert gas that is being filled. In addition, a pressure gauge 10 provided in the low pressure pipe 7,
and the inspection pressure gauges 20 provided in the inspection gas pressure supply pipe 19 are each equipped with a contact that outputs a pressure detection signal when the pointer drops to a predetermined pressure, and the detection signal of this pressure gauge is sent to the center. The presence or absence of leaks may be checked remotely by sending the information to a monitoring panel and displaying it. Furthermore, in place of the pressure gauges 10 and 20 described above, a flow meter or a current meter is installed, and the presence or absence of gas leakage can be determined by whether or not there is a gas flow after nonflammable gas pressure is supplied. Alternatively, the information may be checked using a display on a central monitoring board.

In addition, although the above embodiment took an LP gas facility as an example, the present invention is not limited to this.
Other liquefied petroleum gas, oxygen gas, acetylene gas, hydrogen gas, and other flammable gases having an internal pressure higher than atmospheric pressure, or explosive liquids, gases, and even ammonia,
The same applies to hazardous materials facilities that store and supply toxic gases such as chlorine.

As explained above, according to the present invention, the gas pressure of the shutoff gas container used for emergency shutoff of the container valve provided on the gas container can be supplied to the piping route to the load side, so that earthquakes and Inspection work to check for leaks in pipes after emergency disconnection due to an abnormality such as a gas leak can now be carried out extremely simply and easily. Since a nonflammable gas is used, safety can be ensured even if it takes time to find the leak.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the present invention, Fig. 2 is a sectional view showing the structure of the container valve used in the embodiment of Fig. 1, and Fig. 3 is a state in which the container valve is shut off by gas pressure. FIG. 1... Gas container, 2... Container valve, 3... Base valve, 4... High pressure piping, 5... Automatic switching regulator,
6... Low pressure regulator, 7... Low pressure piping, 8... High pressure pressure gauge, 9... Medium pressure pressure gauge, 10... Low pressure pressure gauge, 11... Gas container for shutoff, 12... Start valve,
13... Gas supply pipe for shutoff, 14... Control panel, 15, 16, 42... Stop valve, 17... Regulator, 18... Check valve, 19... Gas pressure supply pipe for inspection, 20... ...Inspection pressure gauge, 21...Pressure sensor, 22...Lower body, 23, 24...Connection port, 25...Valve chamber, 26...Valve seat, 27...Safety valve, 28...Upper body, 29 ...Shutoff gas supply port, 30...Pipe connection bushing, 31, 34
... Spring, 35 ... Piston, 36 ... Seat gasket, 37 ... Valve member, 38 ... Grand nut, 39 ... Handle, 40 ... Spindle, 41 ... Return valve, 41a ... Operation part.

Claims (1)

[Scope of Claim for Utility Model Registration] A shutoff gas container filled with shutoff gas in a facility that supplies hazardous materials stored in containers to a load side using piping,
a container valve that is directly connected to the container and shuts off the outflow of dangerous substances by supplying gas pressure from the shutoff gas container; and a container valve that is connected to the shutoff gas container and opened by the output of an abnormality detection sensor or manually. one branched secondary side of the starting valve is connected to the container valve, and the other is connected to the piping path to the load side via a stop valve and a pressure regulator. A hazardous materials facility disaster prevention device featuring: