JPH08101172A - Running monitoring system for pig with sound hearing means - Google Patents

Abstract

PURPOSE: To grasp the pig running position in a pipe using a sound hearing means. CONSTITUTION: Acceleration sensors 16, 17 are mounted on the exterior wall surface of a receiver 15 and launcher 14 of a conduit pipe 11, and the vibration based upon the passing sound (striking sound) generated when a pig 10 passes the welding line M in the conduit pipe 11 is picked up and amplified so that it can be heard through speakers 18, 19. It may also be accepted that a sound hearing means (hydrophone) is installed on the inner surface of the receiver 15 and launcher 14 so as to catch the pig passing sound transmitted in a fluid flowing in the conduit pipe 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic listening means capable of ascertaining a traveling position of a pig by catching a sound generated when a pig traveling in a pipe passes a welding point by an acoustic listening means. The present invention relates to a pig traveling monitoring system including means.

[0002]

2. Description of the Related Art Conventionally, a pig which is designed to run in a conduit laid in the ground includes an inspection pig for inspecting for defects such as corrosion thinning, a cleaning pig for cleaning the inside of the conduit, There is a caliper pig for inspecting the shape of the inner surface of the conduit.

When running these pigs in a conduit, it is often convenient in terms of work progress if the position of the conduit in which the pig is running is always known.
Among the above-mentioned conduits, the gas pipe made of steel pipe is constructed by welding, so that the pig 1 has the welding line M.
The position of the pig 1 is grasped by catching the sound generated when passing through. The sound generated when the pig 1 passes through the welding line M is an impact sound generated when the pig 1 passes through a welding portion having an inner diameter narrower over the entire circumference of the pipe wall than other portions. The sound passing through the pig 1 can be picked up by the sounding device R by attaching the sounding device R to the sinking rod 3 provided at a proper position so as to contact the buried conduit 2 from the ground surface (see FIG. 4). ).

[0004]

However, in the method as described above, it is necessary to measure at many places, and the measurer uses the sound detector R to pick up the passing sound of the pig 1. There are inconveniences that it is difficult to specify the position, the measurer has to move as the pig 1 passes, or multiple measurers are required. The present invention has been made in order to improve such an inconvenience, and the acoustic listening means captures a sound generated when a pig traveling in a pipe passes through a welding point, and thereby the traveling position of the pig is detected. It is an object of the present invention to provide a traveling monitoring system for a pig, which is equipped with an acoustic listening means and is capable of grasping the vehicle.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a pipe introducing means for introducing the pig into the pipe is branched and formed in a pipe adapted to introduce and run the pig inside. In addition, the pig collecting means for collecting the pig after traveling is formed in a branched manner, and an acoustic listening means is provided in the pipe introducing means or the pig collecting means, and the sound generated when the pig passes through the welding point in the conduit is generated. To capture
The feature is that this sound is counted to grasp the traveling position of the pig in the conduit.

[0006]

[Operation] When the pig is introduced into the conduit from the conduit introducing means,
The pig runs in the conduit by, for example, high-pressure gas flowing in the conduit and reaches the pig recovery means. At this time, when the pig passes through the welding location, the impact sound is generated because the inner diameter of the welding location is narrower than the other locations. The welding location is
Since it is formed at a predetermined location in accordance with the finished drawing, the impact sound is captured by the acoustic listening means provided in the pipe introducing means or the pig collecting means, and the number of the impact sounds is counted, The current position of the pig can be easily grasped by comparing it with the completed drawing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a pig running monitoring system equipped with an acoustic listening means according to the present invention will be described below in detail. In FIG. 1, a conduit 11 with a pig 10 buried underground
It shows the place to run inside. This pig 10 is a conduit 1
1 inside, and by the running monitoring system (described later),
It is designed so that the traveling position and traveling speed can be grasped. The pig 10 has seal cups 12, 13 dimensioned to be slidable corresponding to the inner diameter of the conduit 11.
From the launcher 14 (means for guiding the pig 10 into the conduit 11) having a branch formed in the conduit 11.
Guided inward, the pressure of the fluid flowing in the conduit 11 causes it to travel in the conduit 11 and to a receiver 15 for collecting the pig 10 branched and formed on the terminal side of the conduit 11 beyond this running section. It is a structure to send in.

The conduit 11 is made of steel pipe, and at the time of laying work, predetermined portions are joined by welding in accordance with the finished drawing, and a welding line M is formed. The welding line M is
The molten metal on the inner surface of the conduit 11 rises over the entire circumference of the pipe wall, and the inner diameter is smaller than that of other locations.

Acceleration sensors 16 and 17, for example, are mounted on the outer wall surfaces of the launcher 14 and the receiver 15 in the conduit 11 as described above.
The vibrations based on the passing sound (striking sound) when the pig 10 passes through the welding line M in the conduit 11 are picked up by 6, 17 and the speaker 18,
It is configured so that it can be heard through 19. Further, a sounding means (hydrophone) may be arranged on the inner surfaces of the launcher 14 and the receiver 15 to capture the passing sound of the pig 10 transmitted in the fluid flowing in the conduit 11.

The traveling monitoring system of the pig equipped with the acoustic listening means according to the present invention is as described above. Next, the traveling monitoring procedure of the pig 10 will be described. Pig 10,
When introduced into the conduit 11 from the launcher 14 of the conduit 11, the pig 10 travels in the conduit 11 due to the pressure of the fluid flowing in the conduit 11, and reaches the receiver 15 for collecting the pig 10. When the pig 10 passes through the welding line M, the welding line M is formed to be thick over the entire circumference of the pipe wall, so that the resistance when passing through other portions becomes larger and a striking sound is emitted. Since the welding line M is formed by welding a predetermined portion in accordance with the finished drawing during the laying work, vibration based on the passing sound (striking sound) of the pig 10 causes vibrations to the launcher 14 or the receiver 15. Captured by the acceleration sensors 16 and 17 in
If the number of vibrations based on the impact sound of is counted, the measurer compares the number with the finished drawing of the conduit 11,
The current position of the pig 10 can be easily grasped. In this way, the measurer can measure the acceleration sensor 16, 17 at the position of the launcher 14 or the receiver 15 of the conduit 11.
Since it is possible to grasp the position of the pig 10 by capturing the vibration based on the passing sound of the pig 10, it is not necessary to provide a passage confirmation point in the middle of the conduit 11, and it is possible to save manpower and labor. It is convenient in terms of progress.

[0011]

As described above, according to the present invention, the measurer uses the acoustic listening means provided in the pipe introducing means or the pig collecting means to capture the sound generated when the pig passes through the welding point in the conduit, Since the traveling position of the pig can be ascertained by counting the sounds generated when passing, it is not necessary to provide a passage confirmation point in the middle of the conduit, and labor and time can be saved.

[0012]

[Brief description of drawings]

FIG. 1 is a schematic side view illustrating an example of a pig running monitoring system including an acoustic listening unit according to the present invention.

FIG. 2 is a schematic side view illustrating an example of a conventional pig traveling monitoring system.

[Explanation of symbols]

 10 Pig 11 Steel Pipe 12, 13 Seal Cup 14 Launcher 15 Receiver 16, 17 Acceleration Sensor 18, 19 Speaker

Claims (1)

[Claims] 1. A pipe introducing means for introducing the pig into the pipe is formed in a branched manner in a conduit adapted to allow the pig to be introduced into the pipe, and a pig collecting means for collecting the pig after traveling is formed in a branched manner. An acoustic listening means is provided in the pipe introducing means or the pig collecting means so as to capture the sound generated when the pig passes through the welding point in the conduit, and count this sound to detect the sound of the pig in the conduit. A pig running monitoring system equipped with an acoustic listening means characterized in that the running position is grasped.