JPS63317500A - Liquid-feed piping - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to liquid supply pipes such as oil pipes buried underground in gas stations and the like for refueling automobiles and the like with gasoline.

[Conventional technology]

In such a fueling station, as shown in FIG. 6, a fuel storage tank 10 is buried underground, and a fuel tank 10 installed above ground is connected to a fuel storage tank 10 by a liquid supply pipe 12. Oil is pumped up from an oil storage tank 10 to a refueling machine 11.

By the way, as an example of a means for detecting oil leakage from the liquid supply pipe 12, conventionally, as shown in Japanese Patent Application Laid-Open No. 57-96991, two bare conductors are inserted into one pipe as the oil leakage detection wire 3. The walls of these pipes are made of an oil-soluble material in whole or in part along the entire length of the pipes, and are buried along the liquid supply pipe 12 almost parallel thereto. 3 is connected to a detector 13 such as an ammeter, and when oil leaks from the liquid supply pipe 12 and touches the oil leak detection wire 3, the detector 13 is activated by the output from this. It is designed to alert you to oil leaks.

[Problem that the invention seeks to solve]

However, such a detection means simply arranges the oil leak detection line as a separate line from the liquid supply piping and runs it along the liquid supply piping. Since the leakage is not in close contact with the detection wire 3, if the leakage is small or if the oil leaks in a direction where the detection wire is not buried, the leakage may not reach the detection wire 3 and the leakage may not be detected.

Furthermore, even if a leak is detected, it may not be possible to clearly distinguish whether it is coming from the liquid supply piping or whether it has seeped into the ground from above ground.
It may be difficult to find the oil leak location. This inconvenience can be solved by covering the upper part of the liquid supply pipe 12 with a membrane 17 that does not permeate oil to distinguish between leaks from the ground and leaks from the liquid supply pipe. The work of burying it is also difficult.

The purpose of the present invention is to eliminate the disadvantages of the conventional example, to be able to reliably detect oil leaks even if the amount is small, and regardless of the direction in which the oil leaks, it is also extremely easy and inexpensive to install. The purpose of this invention is to provide liquid supply piping.

[Means for solving problems]

In order to achieve the above object, the gist of the present invention is to cover the piping along which the leak detection line runs with a heat-shrinkable film.

[Effect]

According to the present invention, since the leak detection line and the piping are integrally covered with a heat-shrinkable film, oil leaking from the piping reaches the leak detection line immediately, even if the leak is a small amount or from where. This can be detected with certainty.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal sectional front view showing a part of an embodiment of the liquid supply piping of the present invention. In the figure, 1 is a piping for pressure-feeding oil etc., 2 is a connector connecting this piping 1, and both ends of the piping 1 are shown in FIG. A threaded portion 1a, which serves as a connecting portion to the connector 2, is formed at the bottom.

Reference numeral 3 denotes a leak detection line provided along the pipe 1, and the leak detection line 3 is, for example, 2 as shown in FIGS. 7 and 8.
The bare conductor wires 4.5 are placed spaced apart and parallel to each other in a tube 6, and the wall of the tube 6 is formed entirely or partially with an oil-soluble substance 7 over its entire length.

Reference numeral 8 in the figure indicates a cylindrical heat-shrinkable film that integrally covers the piping 1 and the leak detection line 3. The heat-shrinkable film 8 is made of vinyl chloride, polypropylene, etc., and is The front diameter is made to be one size larger than the pipe diameter of the pipe 1 and the connector 2.

The parts that cover the pipe 1 and the connector 2 are separate bodies, and the part that covers the pipe 1 is inserted into the part that covers the connector 2.

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

Then, as shown in FIG. 2, both ends of the piping 10 are inserted together with the heat-shrinkable film 8 into the heat-shrinkable film 8 that covers the connector 2 and protrudes from both ends of the connector 2, and the screws at both ends of the piping 1 are connected. Portion 1a faces connector 2.

Next, as shown in FIG. 3, the threaded part 1a of the pipe 1 is inserted into the connector 2, and the pipe 1. 1 with the connector 2, and the protrusions at both ends of the heat-shrinkable film 8 covering the connector 2 are placed over the ends of the piping 1. In this state, as shown in FIG. 4, insert the leak detection wire 3 into the gap formed between the pipe 1 and the connector 2 and the heat-shrinkable film 8, and connect the leak detection wire 3 to the pipe 1 and the connector. Follow 2.

Then, when the heat-shrinkable film 8 is heated by pouring hot water on the outer surface of the heat-shrinkable film 8, the film shrinks and the piping 1. It is in close contact with the connector 2 and the leakage detection line 3 to integrally cover them, and overlaps and covers the joint portion of the pipe 1 and connector 2, so that it also serves as a sealing material.

As shown in FIG. 5, the liquid supply pipe 9 constructed in this manner is buried underground to connect the oil storage tank 10 and the fuel supply machine 11 of the gas station, as in the conventional case, and the leakage The detection wire 3 is led out from the liquid supply pipe 9 and the bare conductor 4
．． 5 is connected to the connecting terminal 14, and the other end is connected to the connecting terminal 1.
5 is connected to a portable detector 13 such as an ammeter.

Liquid supply pipe 12 buried underground in the gas station in this way
If there is no oil leaking from the pipe 1, the bare conductor 4.5 of the leak detection wire 3 is separated, so the circuit is open, and the detector 13 will not operate even if the terminal 15 is connected to the terminal 14. do not.

Now, when oil leaks from the pipe 1, the leaked oil is prevented from flowing outside by the heat-shrinkable film 8, and immediately touches the leak detection wire 3 that is in close contact with the pipe 1, and the oil soluble The substance 7 is dissolved and penetrates into the tube 6, touches the oil-soluble substance 7 inside, and melts it, so that the bare conductors 4 and 5 come into contact with each other.

In this case, the pipe 1 and the leak detection wire 3 are covered with the heat-shrinkable film 8 and are in close contact with each other, so even if there is a small amount of leakage from the pipe 1, the oil will come into contact with the leak detection wire 3. No matter which direction it flows out, it always reaches the heat-shrinkable film 8.

Since the bare conductor wire 4.5 is electrically connected, if the terminal 15 of the detector 13 is connected to the terminal 14, the detector 13 will be activated and the pointer will move to notify leakage.

〔Effect of the invention〕

As described above, the liquid supply piping of the present invention can reliably detect oil leaks, even if the amount of oil leaks is small, and regardless of the direction in which the leak is flowing, it is also extremely easy and inexpensive to install. It is something.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing a part of an embodiment of the liquid supply piping of the present invention, Figs. 2 to 4 are longitudinal sectional front views of a part showing the assembly process, and Fig. 5 is a lubrication of the liquid supply piping. Fig. 6 is an explanatory diagram of a refueling station when it is installed at a conventional location,
FIG. 7 is a longitudinal sectional front view of a part of the leak detection line, and FIG. 8 is a longitudinal sectional side view of the same. 1... Piping 1a... Threaded part 2...
Connector 3... Leak detection wire 4.5... Bare conductor 6... Tube 7... Oil-soluble substance 8
... Heat-shrinkable film 9 ... Liquid supply piping 1
0...Oil storage tank 11...Refueling machine 12
...Liquid supply piping 13...Detector 14.1
5... Connection terminal 17... Membrane

Claims (1)

[Claims] Liquid supply piping characterized by covering the piping along the leak detection line with a heat-shrinkable film.