JPS59171877A - Method for detecting blocked position of pipeline - Google Patents

Abstract

PURPOSE:To calculate a closed position on the basis of the receiving time difference of a generated wave and a reflected wave, by applying abrupt pressure change to the fluid in a pipeline for transporting the fluid. CONSTITUTION:When a pressure wave is generated in a start terminal 1, it is propagated in acoustic velocity through a pipeline and reflected from the nearest end 41 of a blocked part 4. The pressure wave and the reflected wave generated at first are received by a pressure gauge 5 and, when the time difference t2 of said waves is measured by a recorder 6, a distance l comes to l=a, t2/2 [wherein (a) is a pressure propagating speed]. In this case, (a) is preliminarily calculated from the reciprocal required time t1 of the pressure wave to the total length L of the pipeline by closing a terminal valve 3 in a usual time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Llff) The present invention is directed to a method for detecting the location of a blockage point when it occurs in a part of a pipe that transports fluid.

I, 1. When transporting slurry with a high i-form concentration or a liquid with a high coagulation temperature, such as COM (pulverized coal/oil mixture), high paraffin crude oil, heavy oil, etc., by pipe.

Occlusion of the aminal tract may occur due to sedimentation, accumulation, or coagulation of solid components.

In the case of a leak, the internal fluid may flow out of the tube or a pre-leak occurs, so the leak position t±1 can be easily confirmed, but in the case of a blockage, the blockage position tf
It is not easy to locate Q. ruka by obstructing it over the length of a canopy, and it requires a lot of manpower and time. The present invention provides a method that can quickly and easily handle such cases.

(Structure) The present invention generates a pressure wave by applying a sudden pressure change to the fluid in the pipe at one end of the pipe in which the fluid to be transported is sealed, and receives the reflected wave as a pressure signal. The blockage position is determined based on the reception time difference between the wave and the reflected wave.

This takes advantage of the fact that pressure waves propagate at the speed of sound and that pressure waves rebound at blocked locations. To explain this with accompanying drawings, in Figure 1, l is the departure terminal, 2 is the pipeline, 3 is the destination terminal (valve), and the pipeline 2 is
A blocked portion 4 occurs in the middle of γ. In this case 9
・At one end of the pipe line 2, a pressure wave is generated at the optical terminal l. There is no need to use a special device to generate pressure waves (it is possible to press the 81C body by running the pump at the output terminal for a few seconds.On the contrary, in 4, i, If there is residual pressure, a pressure wave will be generated even if a part of it is released outside the system for a few seconds.

The pressure waves thus generated propagate inside the pipe at the speed of sound and rebound at the end 41 closest to the 11′1 blockage], causing 7M inside the ministry.
The first pressure wave and the reflected wave are received as a pressure signal by the pressure sensor 5, and the time difference t2 between them is measured by the recorder 6. The distance 1 kΩ to the nearest end 41 is the support = a meeting t 2 /'
2. However, a is the pressure wave propagation velocity in the fluid inside the pipe. It is possible to calculate the pressure wave propagation velocity of the internal fluid theoretically from the 8 degrees of the fluid and the specifications of the pipe itself, or it is convenient to use actual measured values. iυ is also 11■ Based on the stable operation 1lii before the occurrence of a blockage situation, the required time t1 of the pressure wave over the entire length of the bamboo is determined as 4j11. This can be done by closing i53 on the destination terminal side, artificially turning it into a blocked state, and performing the above operations (I7). Then, the total length of the tube is L-a-tI/2, so father/' L = t 2 /'t + : Sentence = L t
2/t+, and by measuring t2, the distance from the pressure I law localization neck η) to the occluded location can be immediately determined.

The second part 1 shows a model of the state recorded on the pressure recorder. 2 shows a case where the pressure wave is reflected at the end 41 of the blocked portion of the pipe.

On the 1" side, p is the pressure, and °C is the time. The pressure wave reflected at the destination terminal is reflected +1f degrees at the originating terminal, and the process is repeated. Therefore, the peak of the pressure wave is recorded on the recorder at the 1-week period. .

The method of the present invention utilizes the pressure wave propagation speed of the fluid in the pipe.
If a blockage occurs due to a blockage, the propagation will vary depending on the location. If the pipe is long, the estimated location will be 7.
There is a possibility that an error of 1+ x2 may occur. In such a case, leave the pressure wave generation location as it is and move only the pressure gauge Ayohi recorder to a location close to the fixed position 4. Method of rice production invention? Implementation can further improve accuracy. Also, if the same method is carried out from the side of the foil terminal 3,
The length of the blocked portion 4 can be determined by measuring the strength from the departure terminal side and combining it with the result of the case.

(Effects) Since the pump, 4C1 pressure gauge, recorder, etc. used in the zero application of the method of the present invention are usually installed in narrow strips in such a percentage distribution system, no special equipment is required. Quick and easy closure (you can locate the part and, if necessary, find out the length of the part).

[Brief explanation of the drawing]

FIG. 1 is a model diagram of the gamma frame for explaining the method and principle of the present invention, and FIG. 2 is a model diagram of the state in which one is recorded in the cursor record. Agent Patent Attorney Ao Asa Masa Ni

Claims (1)

[Claims] A sudden pressure change is applied to the fluid in the pipe at one end of the pipe in which the fluid to be pumped is sealed, thereby generating pressure, receiving the reflected wave as a pressure signal, and receiving the generated wave and the counter-wave. Does it consist of determining the occlusion position based on the time difference? 6 road blockage location detection method.