JPH06313747A - Gas leakage monitoring device - Google Patents

Abstract

PURPOSE:To monitor gas leakage by a self-recording pressure gauge by providing an auxiliary pressure regulator as a bypass channel for connecting the upstream and downstream sides of a supply pressure regulator. CONSTITUTION:When a gas is used in a house of either housing complex, the gas flows at a remarkable flow rate, thus operating a supply pressure regulator 3 and reducing the gas to a flow pressure. When no gas is used, the gas does not flow. Therefore, an auxiliary pressure regulator 11 provided at a bypass channel 9 is activated and the gas is reduced to a blockage pressure which is slightly higher than the flow pressure. Therefore, the flow pressure is recorded by a self-recording pressure gauge 7 and blockage pressure is recorded at some locations. When gas leakage is sound in a buried gas pipe 6, gas flows at a flow rate corresponding to the amount of gas leakage. Therefore, the regulator 3 is activated so that the flow pressure is recorded and the blockage pressure is recorded. Hence, whether or not the blockage pressure is recorded on a chart paper of the self-recording pressure gauge 7 is checked thus monitoring gas leakage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas leakage monitoring device.

[0002]

2. Description of the Related Art For example, in a housing complex with a scale of 70 or more, when a fuel gas is supplied by an LP gas cylinder, a supply pressure regulator is provided in the gas flow passage to set the gas at a set pressure of the supply pressure regulator. It is well known that the pressure is reduced to 10 and supplied to each home. The set pressure of the supply pressure regulator is approximately 280 mmAq. It is also well known that a self-recording pressure gauge is connected to the downstream side of the supply pressure regulator, and the gas supply pressure is recorded and controlled by the self-recording pressure gauge. Regarding the self-recording pressure gauge, normally, the gas supply pressure is recorded on the chart paper over a period of one round or more, and the gas supply pressure is confirmed and controlled by the chart paper.

By the way, in supplying the gas from the LP gas cylinder, a problem is a gas leakage accident. In particular, gas leakage often occurs due to corrosion of a gas pipe buried in the ground. Therefore, about once every two years, we regularly drill around the buried gas pipe and inspect for gas leaks with a gas detector, but the work is extremely troublesome. There is also a problem that the gas cannot be supplied during the work.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to not only record and manage the supply pressure of gas by a self-recording pressure gauge, but also to monitor gas leakage so that periodical boring is not necessary. It was made for the purpose.

[0005]

According to the present invention, the supply pressure regulator is provided in the gas passage, the self-recording pressure gauge is connected to the downstream side of the supply pressure regulator, and the upstream side of the supply pressure regulator is connected by the bypass passage. The downstream side is connected. Further, a throttle valve is provided in the bypass flow passage, and the flow amount in the bypass flow passage is limited to a minute flow amount.

An auxiliary pressure regulator may be provided in the bypass flow passage so that the auxiliary pressure regulator has a higher set pressure than the supply pressure regulator.

The set pressure of the supply pressure regulator is about 280 m
mAq, the set pressure of the auxiliary pressure regulator is about 320
It is preferably mmAq. The throttle valve is composed of a variable throttle valve, and the set flow rate thereof is preferably 0 to 500 l / h.

[0008]

Description of Embodiments Embodiments of the present invention will be described below.

In FIG. 1, this is used for a housing complex with a scale of 70 or more and supplies fuel gas.
Automatic switching regulator 2 and supply pressure regulator 3 in gas channel 1
Is provided, the LP gas cylinder 4 is connected to the automatic switching regulator 2, and the automatic switching regulator 2 is connected to the supply pressure regulator 3 as in the conventional case. The set pressure of the automatic switching regulator 2 is about 0.5 kg / cm ² , and the set pressure of the supply pressure regulator 3 is about 280 mmAq. Therefore, the fuel gas is supplied by the LP gas cylinder 4, and the gas is supplied to the automatic switching regulator 2 at about 0.
The pressure is reduced to 5 kg / cm ² , and in the supply pressure regulator 3, it is reduced to approximately 280 mmAq. Further, the supply pressure adjuster 3 is connected to the gas cock 5, which is connected to the buried gas pipe 6, and the buried gas pipe 6 is connected to each household, and a gas of about 280 mmAq passes through the buried gas pipe 6 and each household. Is supplied to. The gas cock 5 is for emergency use. Further, a self-recording pressure gauge 7 is connected to the downstream side of the supply pressure regulator 3, and as shown in FIG. 2, the gas supply pressure is recorded on a chart paper 8 over a period of one week or longer, The paper 8 confirms and controls the gas supply pressure.

Further, in this device, the upstream side and the downstream side of the supply pressure regulator 3 are connected by the bypass flow passage 9, the throttle valve 10 is provided in the bypass flow passage 9, and the flow rate of the bypass flow passage 9 is very small. Limited to flow rate. Further, an auxiliary pressure adjuster 11 is provided in the bypass passage 9.
The auxiliary pressure regulator 11 has a higher set pressure than the supply pressure regulator 3. In this embodiment, the set pressure of the auxiliary pressure regulator 11 is set to about 320 mmAq. Throttle valve 1
0 is a variable throttle valve, and its set flow rate is 0-500l
It is set to / h.

Therefore, in this apparatus, when the gas is used in any one of the households in the housing complex, the gas flows with a considerable flow rate. Thus, the supply pressure regulator 3 acts on the gas, reducing the pressure to approximately 280 mmAq, but when the gas is not in use, the gas does not flow. Therefore, the auxiliary pressure regulator 11 acts on the gas, and the gas is about 320 mm.
It is only decompressed to Aq. Therefore, it is recorded by the self-recording pressure gauge 7, the flow pressure of about 280 mmAq is recorded as the supply pressure, and the closing pressure of about 320 mmAq is recorded here and there on the chart paper 8 of FIG.

However, for example, when there is a gas leak in the buried gas pipe 6 and the leak amount exceeds the set flow rate of the throttle valve 10 and is 0 to 500 l / h or more, the gas is used at any home. Even if it does not exist, the gas flows at a flow rate corresponding to the amount of leakage. Therefore, the supply pressure regulator 3 acts on the gas and the gas is approximately 280 mmAq.
Decompressed to. Therefore, even if the gas is not used, a flow pressure of about 280 mmAq is recorded on the chart paper 8 and a closing pressure of about 320 mmAq is not recorded.

Therefore, not only the gas supply pressure is recorded and managed by the self-recording pressure gauge 7, but also the chart paper 8 is used.
It is possible to check whether an occlusion pressure of approx. 320 mmAq has been recorded at, which allows the gas leakage to be monitored. When the closing pressure of about 320 mmAq is recorded on the chart paper 8, it means that there is no gas leakage. Therefore, there is no need to regularly drill.

[0014]

As described above, according to the present invention, not only the gas supply pressure can be recorded and managed by the self-recording pressure gauge 7, but also the gas leakage can be monitored.
Therefore, it is possible to achieve the intended purpose without the need for regular boring.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

FIG. 2 is a plan view of a chart paper of the self-recording pressure gauge of FIG.

[Explanation of symbols]

 1 Gas flow path 3 Supply pressure regulator 7 Self-report pressure gauge 9 Bypass flow channel 10 Throttle valve 11 Auxiliary pressure regulator

Claims (3)

[Claims] 1. A device in which a supply pressure regulator is provided in a gas flow path, and an automatic pressure gauge is connected to a downstream side of the supply pressure regulator, wherein a bypass flow path connects the upstream side and the downstream side of the supply pressure regulator. A gas leakage monitoring device, wherein the gas leakage monitoring device is connected, and a throttle valve is provided in the bypass passage to limit the flow rate of the bypass passage to a minute flow rate. 2. The gas leakage monitor according to claim 1, wherein an auxiliary pressure regulator is provided in the bypass flow passage, and the auxiliary pressure regulator has a set pressure higher than that of the supply pressure regulator. apparatus. 3. The set pressure of the supply pressure regulator is about 2
It is 80 mmAq, the set pressure of the auxiliary pressure regulator is about 320 mmAq, the throttle valve is a variable throttle valve, and the set flow rate thereof is 0 to 500 l / h. Gas leak monitoring device.