CN210831456U - Nonmetal natural gas pipeline leakage test system - Google Patents

Abstract

The utility model relates to a non-metal natural gas line leakage test system, including the trunk line that is the U-shaped form, first branch pipe and second branch pipe, reach on two straight sections of trunk line and top department and be equipped with the mouth that diffuses of simulation leakage point respectively, the starting point section and the terminal point section branch of trunk line are equipped with infrasonic wave sensor, pressure sensor and turbine flowmeter, and the first branch pipe upper branch is equipped with turbine flowmeter and pressure sensor, is equipped with pressure sensor on the second branch pipe, and the mouth that diffuses on two straight sections of trunk line is equipped with the turbine flowmeter, and the mouth that diffuses of trunk line top department is equipped with pressure sensor. The utility model discloses utilize the infrasonic wave sensor to catch the vibration signal that the high-speed friction of the medium that erupts when leaking and damaged pipe wall formed, transmit it to long-range PC end, can verify through further signal analysis and handle whether the pipeline takes place to leak to the accurate leakage position that calculates.

Description

Nonmetal natural gas pipeline leakage test system

Technical Field

The utility model belongs to the technical field of the technique is carried to natural gas and specifically relates to a nonmetal natural gas line leak test system.

Background

With the continuous development of urban natural gas application, urban buried natural gas pipe networks are more and more dense, particularly, problems of pipeline corrosion, aging and the like are gradually shown when non-metal natural gas pipelines are used, pipeline leakage accidents happen occasionally, and great hidden dangers are brought to urban public safety.

Generally, before a fire accident or an explosion accident occurs, a gas pipeline has a leakage phenomenon for a period of time, and the actual situation is that the number of times of pipeline leakage accidents which do not cause the fire or the explosion is relatively more, which not only causes huge energy waste, but also causes serious pollution to the urban environment. Therefore, it is necessary to find leakage points on the pipeline in time, repair the leakage in time and avoid accidents.

Because urban pipelines are laid in a buried manner, leakage points of the pipelines are not easy to find in time, and parameter changes such as leakage quantity, leakage speed and the like of pipeline leakage are inconvenient to measure. Therefore, a set of test system for simulating urban natural gas pipeline leakage is necessary to be established so as to effectively and timely find and position leakage points existing on the natural gas pipeline, so that the leakage points can be quickly repaired, and the safety of natural gas transportation is ensured.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: in order to overcome not enough among the prior art, the utility model provides a non-metal natural gas pipeline leakage test system to explore the application of real-time model method and infrasonic wave in the aspect of non-metal natural gas pipeline leakage detection location.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a nonmetal natural gas line leak test system, includes the trunk line that adopts the PU pipe to bury underground that is the U-shaped, is connected with first branch pipe between the straight section of trunk line, is connected with the second branch pipe between first branch pipe and the trunk line top, is located two straight sections of trunk line and the mouth that diffuses that top department was equipped with the simulation leakage point respectively, the starting point section and the terminal point section branch of trunk line be equipped with infrasonic wave sensor, pressure sensor and turbine flowmeter, the branch is equipped with turbine flowmeter and pressure sensor on the first branch pipe, is equipped with pressure sensor on the second branch pipe, the department that diffuses that is located on two straight sections of trunk line is equipped with the turbine flowmeter, the department that diffuses that is located trunk line top department is equipped with pressure sensor.

For the many pipeline conditions in simulation city, test system contain three test tube ways, one is the pipeline that directly forms by whole trunk line, and it is formed by the pipeline that the flow direction was trunk line, first branch pipe, second branch pipe, trunk line, and its three is formed by the pipeline of whole trunk line plus the first branch pipe and the second branch pipe of intercommunication, test tube way be buried in brick return type recess, the landfill medium is sand, test tube way's pipe diameter is 63 mm.

Furthermore, the first branch pipe is provided with two sets of turbine flow meters and pressure sensors, and the two sets of turbine flow meters and the two sets of pressure sensors are respectively positioned on the first branch pipe on two sides of the joint of the first branch pipe and the second branch pipe.

In order to conveniently test the leakage condition of the pipelines under different pressures, the dispersion port is provided with a leakage valve with adjustable opening.

The utility model has the advantages that: the utility model judges whether the pipeline leaks or not by analyzing the law of pressure and flow on the basis of the traditional pressure sensor and turbine flowmeter, and divides the initial positioning range of leakage; then, leakage signals are captured by respectively arranging infrasonic wave sensors at the two ends of the inlet and outlet air of the main pipeline, when the pipeline leaks, the medium in the pipeline quickly surges to the leakage position and is sprayed out under the action of pressure, the sprayed medium and the damaged pipe wall rub at a high speed to form vibration, the vibration is transmitted to the two ends of the pipeline in an infrasonic wave mode, the infrasonic wave sensors arranged at the two ends of the pipeline capture the signals and transmit the signals to a remote PC (personal computer) end, whether the pipeline leaks or not can be verified through further signal analysis and processing, and the leakage position can be accurately calculated.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. the system comprises a main pipeline, 2, a first branch pipe, 3, a second branch pipe, 4, a dispersing port, 5, an infrasonic wave sensor, 6, a pressure sensor and 7, a turbine flowmeter.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, a nonmetal natural gas line leakage test system, including the trunk line 1 that adopts the PU pipe to bury underground that is the U-shaped, be connected with first branch pipe 2 between the straight section of trunk line 1, be connected with second branch pipe 3 between first branch pipe 2 and the 1 top of trunk line, be located two straight sections of trunk line 1 and top department and be equipped with the mouth 4 that diffuses of simulation leakage point respectively, diffuse mouth 4 on be provided with the leakage valve of adjustable aperture.

The starting point section and the terminal point section of trunk line 1 divide and be equipped with pressure sensor 6 and turbine flowmeter 7, divide on the first branch pipe 2 and be equipped with turbine flowmeter 7 and pressure sensor 6, be equipped with pressure sensor 6 on the second branch pipe 3, be located two straight sections of trunk line 1 and scatter mouthful 4 departments and be equipped with turbine flowmeter 7, be located the mouth of scattering 4 departments of trunk line 1 top department and be equipped with pressure sensor 6.

The business turn over gas both ends of trunk line 1 all are equipped with infrasonic wave leakage monitoring unit, and this infrasonic wave leakage monitoring unit includes infrasonic wave sensor 5 to be equipped with infrasonic wave collection appearance, infrasonic wave leakage analysis appearance and long-range PC end. The whole test system is also correspondingly provided with a pressure-flow acquisition monitoring system, and the specific functions comprise instrument management, chart generation, real-time pressure, real-time flow and data downloading.

The test system contain three test pipelines, one is the pipeline that is directly formed by whole trunk line 1, and it is formed by the pipeline that the flow direction is trunk line 1, first branch pipe 2, second branch pipe 3, trunk line 1, and its third is formed by the pipeline of whole trunk line 1 plus first branch pipe 2 and second branch pipe 3 of intercommunication, the test pipeline buried in brick returns the type recess, the landfill medium is sand, the pipe diameter of test pipeline is 63 mm.

The first branch pipe 2 is provided with two sets of turbine flow meters 7 and pressure sensors 6, and the two sets of turbine flow meters 7 and the two sets of pressure sensors 6 are respectively positioned on the first branch pipe 2 at two sides of the joint of the first branch pipe and the second branch pipe 3.

The apparatus involved in the test of the test system is provided with two CASI type infrasonic wave sensors 5, six pressure sensors 6 and six turbine flowmeters 7 with the models of EVC300 shown in the attached drawing 1, and is also provided with a digital network transmission instrument (digitizer for short) with the model of CASI-RTU, two BIB-II-H factory intrinsic safety power supplies, a GPS Beidou satellite positioning instrument, a plurality of optical cables and a network cable.

The infrasonic wave sensor 5 detects infrasonic wave signals in the pipeline by adopting the body coupling principle, and the infrasonic wave sensor 5 can output infrasonic waves in the form of current signals and is provided with: small volume, light weight, convenient use and high sensitivity, and can resist oil and water corrosion. In addition, the CASI infrasound sensor 5 has an explosion-proof design, can work under a certain static pressure, has no output to the static pressure, can be directly connected with a digitizer, and can be organized into a sensor network measuring system through wired or wireless network transmission.

During the test, close first branch pipe 2 and second branch pipe 3, only open main pipe 1, connect the force pump of the initial section of main pipe 1, open the mouth 4 that diffuses of main pipe 1 terminal point section, make the test tube say and be in the gas circulation state.

Then connect one end of the intrinsic safety power, GPS location, optical cable and network cable to the corresponding interface of the digitizer respectively, the other end of the intrinsic safety power connects to the socket, the other end of GPS location is placed outdoors, the other end of the optical cable connects to the infrasonic wave sensor 5, the other end of the network cable connects to the PC end. Two CASI type infrasonic wave sensors 5 are respectively installed at the starting end and the terminal end of the main pipeline 1 and are communicated with a digitizer through optical cables. And opening a digital-to-analog converter integrated with the pressure sensor 5 and the turbine flowmeter 7, enabling the pressure and flow meters to enter a working state, and transmitting pressure and flow data to a remote PC (personal computer) end in real time.

Starting the alternating current motor, adjusting the working pressure of the pressure pump to 0.4MPa, and starting to convey media. And checking the tightness of the test pipeline to ensure that no macroscopic leakage exists at all pipeline joints.

The digitizer and the pressure and flow meters are configured through the remote PC side, and whether the readings are normal or not is checked. Once everything is ready, test data collection is started.

Firstly, opening a leakage valve on a dispersion port 4 of a main pipeline 1, recording the specific time of operation, enabling the pipeline to be in a leakage state for 2 minutes, observing data such as waveform, frequency spectrum, time frequency and the like of signals in UDP software, and observing fluctuation of pressure and flow signals in a pressure and flow remote control platform.

And then, closing the leakage valve and recording the specific time of operation, keeping the pipeline in a non-leakage state for 2 minutes, continuously observing data such as waveform, frequency spectrum, time frequency and the like of signals in the UDP software, and continuously observing the fluctuation of pressure and flow signals in the pressure and flow remote control platform.

And repeating the steps to perform a plurality of tests, acquiring a plurality of groups of experimental data and accurately recording the specific working condition and the specific time of each operation.

And finally, calculating and analyzing the needed infrasonic wave, pressure and flow data through URT-UDP software and a pressure and flow acquisition system at the remote PC end to realize the detection and accurate positioning of the pipeline leakage.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (4)

1. The utility model provides a nonmetal natural gas line leak test system, includes main pipe (1) that adopts the PU pipe to bury underground that is the U-shaped, is connected with first branch pipe (2) between the straight section of main pipe (1), is connected with second branch pipe (3) between first branch pipe (2) and main pipe (1) top, is located two straight sections of main pipe (1) and reaches scattered mouth (4) that top department is equipped with simulation leakage point respectively, characterized by: the starting point section and the terminal point section of trunk line (1) be equipped with infrasonic wave sensor (5), pressure sensor (6) and turbine flowmeter (7), first branch pipe (2) are gone up the branch and are equipped with turbine flowmeter (7) and pressure sensor (6), be equipped with pressure sensor (6) on second branch pipe (3), mouth (4) departments of scattering that are located on two straight sections of trunk line (1) are equipped with turbine flowmeter (7), mouth (4) departments of scattering that are located trunk line (1) top department are equipped with pressure sensor (6).

2. The non-metallic natural gas pipeline leak test system of claim 1, wherein: the test system contain three test pipelines, one is the pipeline that is directly formed by whole trunk line (1), and it is formed by the pipeline that the flow direction is trunk line (1), first branch pipe (2), second branch pipe (3), trunk line (1) secondly, and its third is formed by whole trunk line (1) with the pipeline of first branch pipe (2) and second branch pipe (3) of intercommunication, the test pipeline buried in brick returns the type recess, the landfill medium is the sand, the pipe diameter of test pipeline is 63 mm.

3. The non-metallic natural gas pipeline leak test system of claim 2, wherein: the first branch pipe (2) is provided with two sets of turbine flow meters (7) and pressure sensors (6), and the two sets of turbine flow meters (7) and the two sets of pressure sensors (6) are respectively positioned on the first branch pipe (2) on two sides of the joint of the first branch pipe and the second branch pipe (3).

4. The non-metallic natural gas pipeline leak test system of claim 1, wherein: the opening-adjustable leakage valve is arranged on the dispersion port (4).

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