JPH0771995B2 - Liquid supply piping - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid supply pipe such as an oil pipe buried in the ground of a gas filling station for supplying gasoline to an automobile or the like.

[Conventional technology]

In such a gas station, as shown in Fig. 6, an oil storage tank is underground.
An oil supply machine 11 in which 10 is buried and which is erected on the ground is connected to an oil storage tank 10 by a liquid supply pipe 12, and oil is pumped from the oil storage tank 10 to the oil supply device 11 via the liquid supply pipe 12.

By the way, as an example of means for detecting oil leakage from the liquid supply pipe 12, conventionally, as shown in Japanese Patent Laid-Open No. 57-96991, two bare conductors are provided in one pipe as an oil leakage detection line 3. Separated and stored in parallel, the wall of this pipe is spread over the entire length and formed wholly or partially with an oil-soluble substance.
It is buried along the line almost parallel to the oil leak detection line 3
Is connected to a detector 13 such as an ammeter. When oil leaks from the liquid supply pipe 12 and this oil touches the oil leak detection line 3, the output from this causes the detector 13 to operate and I am trying to inform you of the leak.

[Problems to be solved by the invention]

However, such a detecting means is one in which the oil leak detection line is separated from the liquid supply pipe and is independent of the liquid supply pipe, and is arranged along the oil supply line. Since they are not in close contact with each other, if there is a small amount of leakage or if oil leaks in the direction in which the detection line is not buried, the leakage oil may not reach the detection line 3 and the leak may not be detected.

In addition, even if a leak is detected, it may not be possible to clearly distinguish whether it is from the liquid supply pipe or whether it has penetrated into the ground from the ground.
It may be difficult to find the location of the oil leak. Such inconvenience can be distinguished between the leak from the ground and the leak from the liquid supply pipe by covering the upper part of the liquid supply pipe 12 with the oil-impermeable membrane 17, but in this case, the membrane 17 is separately provided. It is necessary and the work of burying it is also difficult.

The object of the present invention is to eliminate the inconvenience of the conventional example, and even if the oil leak is small and the outflow is directed in any direction, the leak can be reliably detected, and the construction is extremely easy and inexpensive. Another object of the present invention is to provide a liquid supply pipe capable of sealing the connecting portion at the same time when connecting the pipe with a connector.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a leak detection line along a pipe connected by a connector, covers the connector part and the pipe part with separate tubular heat-shrinkable films, and heat-shrinks the connector part. The gist is that the film is formed to be longer than the connector so as to cover the upper part of the end of the heat-shrinkable film that covers the piping.

[Action]

According to the present invention, since the leak detection line and the pipe are integrally covered with the heat-shrinkable film, the oil leaked from the pipe immediately reaches the leak detection line even if it is a small amount of leak, and wherever it leaks. This can be reliably detected.

Also, when connecting pipes with a connector, the pipe part and the connector part are covered with a separate film, and the film covering the connector is covered on the film covering the pipe, and the film is doubled at this connection part. Therefore, the film acts as a sealing material for the connecting portion.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a vertical sectional front view showing a part of an embodiment of a liquid supply pipe of the present invention, in which 1 is a pipe for pumping oil or the like, 2 is a connector for connecting the pipe 1, and both ends of the pipe 1 are shown. A threaded portion 1a which is a connecting portion to the connector 2 is formed on the.

3 is a leak detection line provided along the pipe 1, and the leak detection line 3 is, as an example, 2 as shown in FIGS.
The two bare conductors 4 and 5 are placed in the tube 6 in parallel and separated from each other.
The wall of which is entirely or partially formed with the oil-soluble substance 7 is used.

Reference numeral 8 in the drawing denotes a tubular heat-shrinkable film that integrally covers the pipe 1 and the leak detection wire 3. The heat-shrinkable film 8 is made of, for example, vinyl chloride or polypropylene, and shrinks. The former diameter is formed to be slightly larger than the diameters of the pipe 1 and the connector 2.

The pipe 1 and the connector 2 are separately covered, and the pipe 1 is covered with the connector 2.

Next, the process of forming a liquid supply pipe using the pipe 1, the connector 2, the leak detection line 3 and the heat shrinkable film 8 will be described with reference to FIGS. 2 to 4. First, the heat shrinkable film 8 is cut. Then, the pipe 1 and the connector 2 are respectively inserted therein. In this case, the length of the heat-shrinkable film 8 into which the connector 2 is inserted is set to be slightly longer than the length of the connector 2.

Then, as shown in FIG. 2, both ends of the pipe 1 are inserted together with the heat-shrinkable film 8 into the heat-shrinkable film 8 which is covered with the connector 2 and protrudes from both ends of the connector 2 so that Face the screw part 1a to the connector 2.

Next, as shown in FIG. 3, the threaded portion 1a of the pipe 1 is inserted into the connector 2 to join the pipes 1 and 1 with the connector 2, and the projections at both ends of the heat-shrinkable film 8 covering the connector 2 are attached to the pipe 1 Cover the edge of. In this state, as shown in FIG. 4, the leak detection line 3 is inserted into the gap formed between the pipe 1 and the connector 2 and the heat-shrinkable film 8, and the leak detection line 3 is connected to the pipe 1 and the connector. Follow along.

Then, when the heat-shrinkable film 8 is heated by pouring hot water on the outer surface of the heat-shrinkable film 8, the heat-shrinkable film 8 shrinks and adheres to the pipe 1, the connector 2 and the leak detection wire 3 to integrally cover them. However, the joint portion between the pipe 1 and the connector 2 is overlapped and covered, and also serves as a sealing material.

As shown in FIG. 5, the liquid supply pipe 9 constructed in this way is buried underground to connect the oil storage tank 10 and the oil supply machine 11 at the gas supply station, as in the conventional case, and the leakage pipe built in the liquid supply pipe 9 is leaked. The detection wire 3 is led out from the liquid supply pipe 9, one end of the bare conductor wires 4 and 5 is connected to the connection terminal 14, while the connection terminal 15 is connected to a portable detector 13 such as an ammeter.

In this way, the liquid supply pipe 12 buried underground in the gas station
When there is no oil leak from the pipe 1, the bare conductors 4 and 5 of the leak detection line 3 are separated, so the circuit is open and the terminal 1
Connecting 5 to terminal 14 does not activate detector 13.

Now, when oil leaks from the pipe 1, the leaked oil does not flow out of the pipe 1 due to the heat-shrinkable film 8 and immediately comes into contact with the leak detection line 3 which is in close contact with the pipe 1, and the oil solubility The substance 7 is melted and penetrates into the pipe 6, and the oil-soluble substance 7 inside is touched and melted, so that the bare conductive wires 4 and 5 contact each other.

In this case, since the pipe 1 and the leak detection line 3 are covered with the heat-shrinkable film 8 and are in intimate contact with each other, even if a small amount of oil leaks from the pipe 1, the oil touches the leak detection line 3, and The heat-shrinkable film 8 always reaches in any direction.

Since the bare conductors 4 and 5 are electrically connected, the detector 13
If the terminal 15 of is connected to the terminal 14, the detector 13 is activated and the pointer is touched to notify the leak.

〔The invention's effect〕

As described above, the liquid supply pipe of the present invention can reliably detect a leak regardless of a small amount of oil leak and the direction of the leak outflow, and the construction is extremely easy and inexpensive. It is a thing.

Also, when connecting pipes with a connector, the pipe part and the connector part are covered with a separate film, and the film covering the connector is covered on the film covering the pipe, and the film is doubled at this connection part. Therefore, the film acts as a sealing material of the connection portion, and is excellent in safety.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical sectional front view showing a part of an embodiment of a liquid supply pipe of the present invention, and FIGS. 2 to 4 are partial vertical sectional front views showing an assembling process. FIG. 6 is an explanatory view of a gas filling station when the liquid supply pipe is installed at the gas filling station, and FIG. 6 is an explanatory view of a gas filling station showing a conventional example as above.
FIG. 7 is a vertical sectional front view of a part of the leak detection line, and FIG. 8 is a vertical sectional side view of the same. 1 …… Piping, 1a …… Screw part 2 …… Connector, 3 …… Leak detection wire 4,5 …… Bare conducting wire, 6 …… Pipe 7 …… Oil soluble substance, 8 …… Heat shrinkable film 9 …… Liquid supply pipe, 10 …… Oil storage tank 11 …… Oiler, 12 …… Liquid supply pipe 13 …… Detector, 14, 15 …… Connection terminal 17 …… Membrane

Claims (1)

[Claims] 1. A leak detection line is laid along a pipe connected by a connector, the connector part and the pipe part are covered with a separate cylindrical heat-shrinkable film, and the heat-shrinkable film covering the connector part is made longer than the connector. A liquid supply pipe characterized in that the liquid supply pipe is formed so as to cover an upper portion of an end of a heat-shrinkable film which covers the pipe.