RU176447U1 - MAGNETIC DEFECTOSCOPE FOR CONTROL OF UNDERWATER TRANSITIONS OF PIPELINES - Google Patents

Abstract

The invention relates to a device for diagnosing the technical condition of underwater metal pipelines. A magnetic flaw detector for monitoring underwater transitions of pipelines contains a housing with a rod fixed on it, while an ADC is located in the housing, the output of which is connected to the input of the sensor interface unit, the output of which is connected to the inputs of the display and the memory unit controller, the output of which is connected to the input of the memory unit, a current source unit and a sensor controller, the outputs of which are connected to the input of each of two magnetoresistive magnetic field sensors, the outputs of which are connected to the ADC input. At the same time, magnetoresistive magnetic field sensors are fixed at the end of the rod at different heights, and at the junction of the rod and the housing, pens are mounted on different sides of the longitudinal axis of the housing, in which the first and second control units are located, the outputs of which are connected to the input of the sensor interface unit. The technical result is an increase in measurement accuracy. 2 s.p. f-ly, 1 ill.

Description

FIELD OF TECHNOLOGY

The utility model relates to measuring equipment, in particular non-contact diagnostics, is a device for diagnosing the technical condition of underwater metal pipelines, including underwater transitions, and can be used for defectoscopic monitoring of a state, for example, stress-strain state of a metal of a pipeline, violation of the integrity of the pipeline and insulation coatings, etc., underground oil and gas pipelines and other metal pipelines.

BACKGROUND

Known magnetic flaw detector for monitoring underwater metal pipelines, disclosed in RU 108846 U1, publ. 09/27/2011. A magnetic flaw detector for monitoring underwater metal pipelines contains the first and second magnetic field transducers, the first magnetic field transducer contains at least two magnetic field sensors in the form of magnetoresistors, the second magnetic field transducer contains at least two magnetic field sensors in the form of magnetoresistors, magnetic field sensors of the first and the second magnetic field transducers are installed along mutually perpendicular lines, a controller with a keyboard, an information display unit AI, first and second amplifiers, analog-to-digital converter (ADC), first and second program-controlled attenuators, analog subtraction unit, stabilized direct current source, intermediate memory unit, spatial reference unit, memory unit and accelerometer unit, magnetic field converters are located above the soil surface above the pipeline, while the first output of the stabilized DC source is connected to the input of the first magnetic field transducer, its second output is connected to the input ohm of the second magnetic field converter, the first output of the second amplifier is connected to the second input of the analog subtraction unit, the first input of which is connected to the first output of the first amplifier, the first input of which is connected to the output of the first program-controlled attenuator, the input of which is connected to the output of the first magnetic field converter, the first output of the analog subtraction unit is connected to the first input of the intermediate memory unit, and its second output is connected to the fourth input of the intermediate memory unit, the output of which connected to the input of the ADC, the second output of the first amplifier is connected to the second input of the intermediate memory unit, the third input of which is connected to the second output of the second amplifier, the first output of the controller is connected to the second input of the first software-controlled attenuator, the third output of the controller is connected to the second input of the second software -controlled attenuator, the first input of which is connected to the output of the second magnetic field converter, and the output is connected to the input of the second amplifier, the third input of the controller is connected to the output accelerometer unit, the fourth output of the controller is connected to the input of the memory unit, the second input of the controller is connected to the output of the spatial reference unit, the ADC output is connected to the first input of the controller, the keyboard output is connected to the fourth input of the controller, the second output of the controller is connected to the input of the information display unit, which differs the fact that it further comprises a third magnetic field transducer, which contains at least two magnetic field sensors in the form of magnetoresistors that are installed along lines perpendicular to the lines along which the sensors of the first and second magnetic field transducers are located, the third software-controlled attenuator, the third amplifier and the control signal generating unit, while the third output of the stabilized DC source is connected to the input of the third magnetic field converter, the output of which is connected to the input of the third software-controlled attenuator, the output of which is connected to the input of the third amplifier, the output of which is connected to the third input of the analog block Vågå subtracting the third output is connected to the input unit generating a control signal whose output is connected with a carrier control system of the magnetic flaw.

A disadvantage of the known device is that this flaw detector is designed to be mounted on an underwater telecontrol vehicle of the ROV type, since it does not contain an information display device in the flaw detector body: the display is located on a support vessel. At shallow depths, it is much more productive and cheaper to use a diver as a flaw detector carrier, i.e. Functionally, these are several different devices.

In addition, it is known a device for diagnosing the technical condition of underwater metal pipelines, disclosed in RU 2525462 C1, publ. 08/20/2014, prototype. A device for diagnosing the technical condition of metal pipelines contains at least two three-component magnetic field induction sensors located at different levels in height relative to the pipeline, each of which contains three magnetic field induction meters located respectively along the coordinate axes X, Y, Z, where the X axis is located in the horizontal plane and perpendicular to the longitudinal axis of the pipeline, the Y axis is parallel to the longitudinal axis of the pipeline, the Z axis is perpendicular to the X and Y axes, and also containing the first and second amplifiers, the ADC, a device for determining the difference in the values of the magnetic field induction along the X, Y, Z axes, a controller, a memory unit and an information display device. In this case, the first, second and third meters of the first three-component sensor are connected respectively to the first, second and third inputs of the first amplifier, the first, second and third meters of the second three-component sensor are connected to the first, second and third inputs of the first amplifier, the outputs of the first and second amplifiers are connected respectively, with the first and second inputs of the ADC, the first output of the controller is connected to the memory unit, and its second output is connected to the information display device. Moreover, the device further comprises a unit for determining the magnitude and direction of the full vector of the magnetic field induction measured by the first three-component sensor, a unit for determining the magnitude and direction of the full vector of the magnetic field induction measured by the second three-component sensor, and a unit for determining the difference and angle between the full vectors of the magnetic field induction measured the first and second three-component sensors, the device for determining the difference in the values of the magnetic field induction along the X, Y, Z axes is made in the form of a block ka digital subtraction. In this case, the first ADC output is connected to the input of the digital subtraction unit, the output of which is connected to the first input of the controller, the input of the unit for determining the direction of the full vector of magnetic induction by the first three-component sensor is connected to the second output of the ADC, and the output of this unit is connected to the first input of the difference and angle determination unit between the full vectors of the first and second three-component sensors, the input of the unit for determining the full vector of magnetic induction by the second three-component sensor is connected to the third output of the ADC, and the output of this unit is connected to the second input of the unit for determining the difference and angle between the full vectors of the first and second three-component sensors, the output of which is connected to the second input of the controller.

The disadvantages of the disclosed device for diagnosing the technical condition of underwater metal pipelines are insufficient noise immunity and measurement accuracy under water.

DISCLOSURE OF A USEFUL MODEL

The objective of the claimed utility model is to develop a non-contact magnetometric diagnostic device with high noise immunity.

The technical result of the utility model is to increase the measurement accuracy.

The specified technical result is achieved due to the fact that the magnetic flaw detector for monitoring underwater transitions of pipelines contains a housing with a rod fixed on it, while the ADC is located in the housing, the output of which is connected to the input of the sensor interface unit, the output of which is connected to the inputs of the display and controller of the memory unit the output of which is connected to the input of the memory block, the current source block and the sensor controller, the outputs of which are connected to the input of each of the two magnetoresistive magnetic field sensors, the outputs of which are connected s to an input of the ADC. At the same time, magnetoresistive magnetic field sensors are fixed at the end of the rod at different heights, and at the junction of the rod and the housing, pens are mounted on different sides of the longitudinal axis of the housing, in which the first and second control units are located, the outputs of which are connected to the input of the sensor interface unit.

Magnetoresistive magnetic field sensors are made of three components.

At the end of the rod is a valve for purging with dried nitrogen.

BRIEF DESCRIPTION OF THE DRAWINGS

The utility model will be more clear from the description, which is not restrictive and is given with reference to the accompanying drawings, which depict:

FIG. 1 - Block diagram of the device.

1 - the first control unit; 2 - second control unit; 3 - sensor controller; 4 - the first magnetoresistive magnetic field sensor; 5 - second magnetoresistive magnetic field sensor; 6 - sensor interface unit; 7 - ADC; 8 - display; 9 - memory block controller; 10 - memory block; 11 - current source unit.

IMPLEMENTATION OF A USEFUL MODEL

A magnetic flaw detector for monitoring underwater transitions of pipelines contains a housing with a rod fixed on it, while an ADC (7) is located in the housing, the output of which is connected to the input of the sensor interface unit (6), the output of which is connected to the inputs of the display (8) and the controller (9 ) a memory block (10), the output of which is connected to the input of the memory block (10), the current source block (11) and the sensor controller (3), the outputs of which are connected to the input of each of the two magnetoresistive sensors (4, 5) of the magnetic field, the outputs which are connected to the input of the ADC (7). At the same time, magnetoresistive sensors (4, 5) of the magnetic field are fixed at the end of the rod at different heights, and at the junction of the rod and the case, the handles are fixed on different sides of the longitudinal axis of the case, in which the first (1) and second (2) control units are located whose outputs are connected to the input of the sensor interface unit (6).

Magnetoresistive sensors (4, 5) of the magnetic field are made of three components.

At the end of the rod is a valve for purging with dried nitrogen.

Magnetic flaw detector operates as follows.

A driver underwater moves a magnetic flaw detector along a pipeline route. For accurate movement along the axis of the pipeline, an underwater locator is used, which moves the leading driver. The magnetic field of the pipeline is perceived by three-component magnetoresistive sensors (4, 5) of the magnetic field, each of which contains three orthogonally oriented magnetoresistors. Three-component magnetoresistive sensors (4, 5) of the magnetic field convert the magnetic field into a voltage proportional to the magnitude of the magnetic induction, which is fed to the ADC (7), in which the analog signal is converted to digital. The signal from the ADC (7) enters the sensor interface unit (6), combining the commands from the control units with the data stream coming from the ADC (7). From the sensor interface unit (6), the signals are sent to the display (8), and also through the controller (9) of the memory unit to the memory unit (10) and stored in it. At the end of the magnetic flaw detector, the memory block (10), which is a flash card, is removed from the housing through a special technological access door and transmitted to the subsequent analysis of the stored signal data. Also, through a special hatch, a block of current sources (11), which is a lead-acid gel battery, is removed to charge it.

At the end of the rod there is a valve to purge the internal volume of the magnetic flaw detector with dried nitrogen before starting work. This is to prevent condensation when working in cold water.

The location of three-component magnetoresistive sensors (4, 5) of the magnetic field in the rod at different heights allows you to arrange them at different levels in height relative to the pipeline. The sensor controller (3) controls the operating modes of the sensors from control commands coming from the first and second control units (1, 2) through the sensor interface unit (6). The sensor controller (3) allows you to send a signal to the resolution of the measurement, adjust the frequency of the polling of the sensors.

The first and second control units (1, 2), which are multifunctional button devices fixed at the junction of the rod and the housing on different sides of the longitudinal axis of the housing, in addition to supplying control signals, enable the magnetic flaw detector to be turned on or off, and to change the scale and speed of scanning magnetograms on the display (8), install electronic markers, etc., and also allow for easy control of the operation of the device, and quickly install electronic markers, upon detection anomalies of the magnetic field, which provides improved measurement accuracy.

The sensor interface unit (6) is designed to distribute the obtained magnetometric information between the memory unit (10), which is used to store the measured magnetic field parameters for the purpose of further cameral processing and a display on which the magnetometric information is displayed online. Online mode is used for rapid assessment of the state of the underwater pipeline. In this case, when a magnetic field anomaly is detected, the diver quickly sets the signal buoy at the point of the detected anomaly, which ensures an increase in the measurement accuracy.

The use of three-component magnetoresistive magnetic field sensors in the claimed device allows to increase the measurement accuracy by increasing the polling frequency of the sensors used, by reducing the inertia of the sensors used, which reduces the measurement step, which makes it possible to identify point defects; to increase noise immunity during electromagnetic pollution (for example, from other circuit elements); low residual magnetization of the sensors used allows to increase the accuracy of the readings.

In addition, the use in the claimed device of three-component magnetoresistive magnetic field sensors allows you to assemble and place structural elements in a smaller enclosure and in close proximity to the sensors, which allowed to reduce the dimensions and weight of the claimed device, while improving the measurement accuracy, due to the absence of the influence of electromagnetic pollution with taking measurements.

The claimed magnetic flaw detector for monitoring underwater transitions of pipelines is a functionally complete stand-alone device containing a magnetometer unit, a controller, a control system, an information storage unit and an information display system in one housing that does not have a mechanical connection with the supply vessel and is controlled by a diver, which allows it to be transported by a diver in conditions of insufficient transparency of water (limited visibility) the presence of currents. The underwater remote-controlled device cannot provide a fairly straightforward movement along the axis of the pipeline, since the windage of the device itself and the control cable have a negative effect, which reduces the accuracy of magnetometric data.

A utility model has been disclosed above with reference to a specific embodiment. For specialists, other embodiments of the utility model that do not change its essence, as disclosed in the present description, may be obvious. Accordingly, a utility model should be considered limited in scope only below the following utility model formula.

Claims (3)

1. A magnetic flaw detector for monitoring underwater transitions of pipelines, comprising a housing with a rod fixed to it, while an analog-to-digital converter is located in the housing, the output of which is connected to the input of the sensor interface unit, the output of which is connected to the inputs of the display and the controller of the memory unit, the output of which connected to the input of the memory unit, the current source unit and the sensor controller, the outputs of which are connected to the input of each of the two magnetoresistive magnetic field sensors, the outputs of which are connected to the input of analog-digital about the transducer, while the magnetoresistive magnetic field sensors are fixed at the end of the rod at different heights, and at the junction of the rod and the housing on different sides of the longitudinal axis of the housing are fixed handles in which the first and second control units are located, the outputs of which are connected to the input of the interface unit sensors. 2. The magnetic flaw detector according to claim 1, characterized in that the magnetoresistive magnetic field sensors are made of three components. 3. The magnetic flaw detector according to claim 1, characterized in that a valve for purging with dried nitrogen is located at the end of the rod.

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