RU2234636C1 - Method of diagnosing pipeline - Google Patents

Abstract

FIELD: pipeline engineering.

SUBSTANCE: method includes monitoring of the active components of currents consumed by the driving electric motors for pumping plants of pumping stations and monitoring of voltages at the clamps of the power circuits of electric motors and remote transfer of information to the control computing unit which calculates power consumption of the plants and when this value exceeds a permissible one a command is sent for localizing a pipeline segment to be protected.

EFFECT: enhanced reliability of pipeline operation.

1 dwg

Description

The invention relates to remote monitoring of the state and protection of the main pipeline from leaks and can be used to create automated control systems for the transport of oil, gas, water and other products.

A known method of visual monitoring of the state of the linear part of the pipeline, which consists in periodically inspecting the earth along the route in order to detect leaks [1]. But this method is very laborious and not always feasible due to climatic and natural conditions.

A known method for detecting leaks associated with the passage through the pipeline of various recording devices [2]. The disadvantages of the method are the complexity of the equipment and the need for special equipment of the pipeline.

A known method for detecting leaks based on the registration of noise arising in places of leakage of the pumped product [3]. The application of this method requires the equipment of the pipeline with a large number of expensive equipment due to the small radius of the sensitivity of the sensors.

The closest technical solution, selected as a prototype, is a method for detecting leaks of the pumped product from the pipeline, which consists in recording the active components of the currents consumed by the electric motors of the pumping units at the beginning and end of the linear section of the pipeline. In this case, the value of the mismatch between them is determined, it is compared with the specified setting of the permissible mismatch, and if the latter is exceeded, they give a control effect on the localization of the accident on the pipeline [4].

However, this method has the following disadvantage. It does not take into account the influence of changes in the supply voltage at the terminals of the power circuit of the drive electric motors, which can lead to large errors in current measurement and, accordingly, to inaccuracies in the operation of the protection in the event of an emergency on the pipeline.

The objective of the invention is to reduce the loss of the pumped product and the harmful effects on the environment.

The technical result is an increase in the reliability of the main pipeline by increasing the accuracy of detection and localization of leaks from it.

The technical result is achieved by the fact that the proposed method for diagnosing a pipeline located between pumping stations consists in monitoring the active components of the currents consumed by the electric motors of the pumping units, as well as in monitoring the voltages at the terminals of the power circuits of the electric motors of each pumping station, and transmitting information remotely to the control computing device, by which the active power of the electric motors of the pumping units is calculated, determining and the degree of mismatch of active capacities and comparing the mismatch value with a given set point, when the value of which is exceeded, a control action is generated on the localization of the emergency section of the pipeline.

The proposed method differs from the known one in that, in addition to the active components of the current loads of the electric motors of the pumping units of adjacent pumping stations, the voltage values at the terminals of their power circuits are also used to calculate the consumed active power of the electric motors, by comparing the values of which the emergency situation in the pipeline section is determined.

The drawing shows a structural diagram of a device that implements the proposed method for the diagnosis of the pipeline.

A device for detecting leakage of a transported product from a main pipeline 1, enclosed between pumping stations 2, 3, contains current sensors 6 and voltage sensors 7 in the power circuit of electric motors 5 of pumping units 4, the outputs of which are connected to the inputs of current and voltage converters 8 with remote information transmission. Converters of current and voltage 8 transmit information to the control computing device 9 installed on the pumping station 2.

A method for diagnosing a pipeline is as follows. The signals from the current sensors 6 and voltage 7 are continuously fed to the inputs of the converters 8, where for all working electric motors 5 of each pumping station 2 and 3, the values of the active components of the load current and voltage are determined, after which the high-frequency components are filtered, and the information is converted into a convenient form for transferring it to the control computing device 9. The control computing device 9 is a central element of the device for detecting product leaks from the highway th pipeline 1. It performs calculation of the total consumed active power of the motor 5 according to the information received from the current and voltage transducers 8 for each pumping station 2, and 3, and comparing them. As a result of the comparison, the degree of mismatch of the active powers consumed by the electric motors 5 of the pumping units 4 of the pumping stations 2 and 3 is determined. After calculating the value of the mismatch of the active powers, the control computing device 9 compares it with a given set point and, when its value is exceeded, gives a control effect on the localization of the accident.

The inventive method for controlling the leakage of the pumped product allows an indirect method to control changes in the technological mode of operation of the main pipeline using simple, reliable and relatively cheap electrical measuring instruments with a higher accuracy class in comparison with the tools used to measure the technological parameters of the pipeline.

Due to the inertia of current and voltage measuring instruments, this method provides a significant reduction in the response time to emergency response.

Sources of information

1. Ionin D.A., Yakovlev E.I. Modern diagnostic methods for gas pipelines. - L .: Nedra, 1987. - P.69-71.

2. Modeling the problems of operation of pipeline transport systems / Yakovlev E.N., Kulikov V.D., Shibnev A.V., Polyakov V.A., Kovalevich N.S., Sharabudinov Yu.K. - M.: VNIIOENG, 1992. - P.77-107.

3. Pipeline transport of unstable gas condensate / Korshak A. A., Zabaznov A. I., Novoselov V. V., Matrosov V. I., Klyuk B. A. - M .: VNIIOENG, 1994. - P.153-161.

4. Patent No. 2196161 of the Russian Federation, IPC F 17 D 5/02, publ. 1998.

Claims (1)

A method for diagnosing a pipeline located between pumping stations, which consists in monitoring the active components of the currents consumed by the electric motors of the pumping units, characterized in that they control the voltage at the terminals of the power circuits of the electric motors of each pumping station and remotely transmit information to the control computing device by which the active power is calculated electric motors, then determine the degree of mismatch between them and compare the value discrepancies with a given setting, when exceeded, they give a control action on the localization of the emergency section of the pipeline.