RU51230U1 - AUTONOMOUS MAGNETIC DEFECTOSCOPE OF EXTERNAL PIPELINE MONITORING - Google Patents

Abstract

1. The utility model relates to the technique of non-destructive testing of pipes of a main pipeline transport. 2. The utility model allows to increase the operational reliability of trunk pipelines. 3. The goal is achieved by the fact that the principle of complete autonomy of the magnetic flaw detector is implemented through the use of an internal combustion engine, wireless transmission of defect information, a high-sensitivity magnetic search system, the flaw detector movement on a spiral surface due to the difference in wheel diameters, magnetic flaw detector holding on the pipe by the forces of the magneto-search system, as well as the possibility of monitoring without removing the insulating coating of pipes and monitoring pipe monitoring in real scale time.

Description

The utility model relates to the field of non-destructive testing, in particular, pipes of pipeline transport, can be effectively applied both for diagnosis during their re-insulation, and for monitoring pipelines of compressor stations.

Scanning devices portable, movable manually or electrically driven are known in non-destructive testing.

Known scanner-flaw detector series "Complex-2" (see appendix), which is installed to control the pipe section measuring 100 × 100 mm or less. After examining this section, the scanner is rearranged sequentially to other sections of the pipe. The disadvantage of this flaw detector scanner is its constant connection with an external power source and its manual rearrangement from site to site of a small size due to the discrete nature of the pipe surface study.

A known non-destructive testing system “Pipe VVIZARD PA” (see Appendix), in which the scanner moves along a special overpass (flexible rail), which is preliminarily laid along the weld. The disadvantage of this system is the need to lay an overpass, fastening it to the pipe so that the scanner is held on the pipe when passing the lower sections of the pipe.

The closest technical solution to the proposed utility model is a self-propelled scanner on magnetic wheels "TS 2000" (see. Appendix). The disadvantages of this device are wired communication for receiving information about defects with an external power source and the limited distance of movement along the pipe, which is determined by the cable length of 15 m. In addition, the minimum crack width detected by this device is 2 mm, while for cracks it is significantly less disclosure is the destruction of the pipe.

A utility model is proposed that does not have these drawbacks and has the following advantages:

- The length of the tested part of the pipe is not limited, since the movement of the proposed flaw detector is carried out by an internal combustion engine mounted on the flaw detector body and operating in any spatial position.

- A magnetic flaw detector is held due to the attraction of the magnetic system to the pipe by the magnetic forces, which simultaneously magnetizes the pipe to form fields over the defects.

- A continuous control of the entire surface of the pipe is carried out, since the magnetic modules of the flaw detector move along a helical surface (Fig. 1). A flaw detector may include one, two, or more magnetic modules.

- Information from Hall sensors about defects, including in real time, is transmitted using a wireless communication device of an industrial on-board computer mounted on a magnetic module,

- For the flaw detector to move through the pipe and to detect defects, removal of the insulation coating from the pipe is not required.

The purpose of the development of the proposed utility model is to increase the operational reliability of main pipelines and to create a magnetic flaw detector for detecting dangerous defects in main pipelines, to carry out repairs and subsequent re-isolation of checked (therefore defect-free) pipe sections.

To perform a continuous scan of the pipeline surface by moving the flaw detector along a spiral path, its design was used, including wireless communication with the operator, an internal combustion engine and a magnetic search system, which, in addition to magnetizing the control-pipeline object, simultaneously ensures that the flaw detector body is kept on it.

In the figures indicated: Figure 1. Scheme of flaw detector movement along a spiral scanning surface. 1 - pipe; 2 - flaw detector; 3 - scanned spiral surface. Figure 2. Scheme of the device of the proposed autonomous magnetic flaw detector. 1 - pipe; 2 - magnetic modules; 3 - case; 4 - internal combustion engine; 5 - wheels; 6 - safety rollers; 7 - magnetic blocks; 8 - industrial on-board computer with a wireless device; 9 - battery pack. 10 - ADC; 11 - chain transmission; 12 - gear wheel rotation; 13, 14 - attachment points of the axle with wheels.

Description of the design of an autonomous magnetic flaw detector. The proposed flaw detector contains:

- Magnetic modules. In each module, 3 magnetic blocks 7 are installed (Fig. 2). The block case is made of stainless steel, it houses the magnetic system and the Hall sensor system, which are filled with a compound, which ensures their high reliability. Modules

attracted to the pipe by the magnetic forces of the permanent magnets of the search engine with a force of the order of 5000 N.

- An internal combustion engine 4, which can work in any spatial position, including when passing through the bottom of the pipe. The engine through the gearbox and chain transmission 11 is connected to the wheels 5. The engine can be installed on each module or on one of them. The engine power is sufficient for the modules to move along a spiral surface through a pipe.

- Safety rollers 6. Installed on each module. In the event of a change in the curvature of the pipe or its significant deformation, the rollers prevent a decrease in the gap between the module and the pipe surface to less than a predetermined value.

- The wheels on the axle are attached to the housing using nodes 13, 14. Each module is equipped with two pairs of wheels of different diameters. The diameter of the wheels located on one diagonal of the module differs from the diameter of the wheels located on the other diagonal. This ensures that the flaw detector moves in a spiral. The difference in wheel diameter is calculated by the formula:

Where:

φ ₁ = γ-90 + α;

φ ₂ = γ + 90-α;

D is the pipe diameter;

P ₂ - the distance between the axles of the wheels;

P ₁ - the distance between the wheels on the same axis;

D is the pipe diameter;

Δh is the difference between the radii of the pairs of wheels located on different diagonals of the module;

q is the width of the "capture".

- On-board computer 8 with a wireless device for transmitting information about defects.

The work of the flaw detector is as follows. For re-insulation, the pipe is raised above the ground by about 1 meter and held by special taps. The flaw detector is installed on the pipe, the engine is started, and an industrial computer is turned on. Engage the engine clutch. The flaw detector will move in a spiral, reading signals from sensors and writing information to the on-board computer, which is transmitted to the main control computer wirelessly. On the main computer, the operator monitors the signals in real time and recognizes the detected defects using them. If necessary, the flaw detector can be stopped and its movement re-enabled. The installed magneto-search system ensures the detection of any kind of defects, including stress-corrosion cracks with a depth of 10% of the pipe thickness, which corresponds to the technical specifications.

An example of a utility model.

A working model of an autonomous magnetic flaw detector was manufactured.

The model of the flaw detector has the following technical data.

Used engine capacity of 1.6 hp Fuel capacity in the tank for 3 hours. It works without a wire connection to transmit information.

One revolution in a pipe with a diameter of 1420 mm takes 20 s, while the width of the scanned surface is 170 mm. Flaw detector installation time on the pipe 10 min. Type of industrial computer ES-271. Type ADC E-440. The overall dimensions of the flaw detector are 900 × 700 × 440 mm.

The diameters of the pairs of wheels are 450 mm and 435 mm.

When testing the layout, cracks were revealed in accordance with the technical specifications for pipe inspection.

Industrial production of the proposed autonomous magnetic flaw detectors on and their application will increase the reliability of gas and oil pipelines

Thus, the above and justified set of features of the proposed device is necessary and sufficient

reliability of the main pipeline in connection with the creation and use of an autonomous magnetic flaw detector for pipe inspection, in particular, during re-insulation and repair.

Claims (2)

1. An autonomous magnetic flaw detector for external monitoring of pipelines, comprising a housing, a magnetic field source, magnetically sensitive sensors, characterized in that a magnetic module with a magnetic search system is mounted on the flaw detector body, attracted to the pipe with a force of 4000 ... 5000 N, and an internal motor combustion associated with the drive with two pairs of wheels, and the diameter of the wheels located on one diagonal of the module differs from the diameter of the wheels located on the other diagonal. 2. The flaw detector according to claim 1, characterized in that a device for wirelessly transmitting information about defects removed from magnetic field sensors is installed on the magnetic module.