产品介绍
英文版:English version
Catalog
I. Brief introduction of non-contact magnetic measurement diagnosis technology
2. System host
3. Select the scanning device as required
4. MM-System Graphic Software for Metal Magnetic Memory Method Stress Concentration Detection System
5. Brief description of the process of using metal magnetic memory method to detect buried pipelines
6. Application Scope of Buried Pipeline Stress Concentration Detection System
7. Detection cases using this technology:
Buried pipeline stress concentration detection system
I. Brief introduction of non-contact magnetic measurement diagnosis technology
The invention relates to a buried pipeline stress concentration detection system, which uses a metal magnetic memory detection theory to detect a buried pipeline, and has the basic principle that after a metal component is corroded and fatigued, the internal grain structure of the metal is changed, the average internal stress level caused by the inhomogeneity of the organizational structure is uneven, and a self-leakage magnetic field is generated in a stable sliding dislocation zone, An object to be inspected is detected in the environment of the earth's magnetic field,There is a strong magnetic field gradient in the stress concentration area, and the non-contact magnetic diagnosis is based on detecting the change of the earth magnetic field distortion formed by the change of the magnetic permeability of the pipeline metal in the stress concentration area and the corrosion-fatigue damage growth area. The working principle of the instrument is to measure the distribution of the magnetic field Hp of a detected object, establish that the relationship between the distribution of the magnetic field Hp and the residual stress is the strength value and the change characteristic of the normal component and the tangential component of the leakage magnetic field measured right above the ground surface of the detected pipeline by using a special scanner,To evaluate the stress concentration and deformation state of pipeline or equipment structure, analyze the change of metal structure, and find out the method of defect. Using the metal magnetic memory non-contact magnetic detection method to detect the buried pipeline can find out and locally locate the stress and deformation state and various types of damage existing in the pipeline metal under the ground, underwater or other media.
The non-contact magnetic diagnosis is based on the detection of the time variation of the earth's magnetic field formed by the change of the magnetic permeability of the pipeline metal in the stress concentration area and the corrosion-fatigue damage growth area, The change characteristics (frequency and amplitude) of the earth's magnetic field caused by the deformation of the pipeline are generated under the action of a series of factors: the residual stress of process manufacturing and installation, the self-compensation stress of working load and temperature fluctuation of air temperature and medium (soil, water, etc.).
When the pipeline condition information is diagnosed according to the non-contact magnetic measurement method, the analysis can be carried out according to the criterion and software package developed by the metal magnetic memory method. The method can be used for comprehensive evaluation of the pipeline condition, and can also be used together with other non-destructive testing methods for evaluation
Estimate.
Non-contact magnetic diagnostic method is a new technology for nondestructive testing of oil and gas buried pipelines, which can determine the metal state of buried pipelines. The detection speed is high, the detection cost is low, a large amount of excavation work is not needed, and only the position with the abnormal distribution of the magnetic field needs to be excavated for verification. There is no need to remove the anticorrosive coating on the pipeline for excavation verification, and the metal magnetic memory method can detect the metal state of the pipeline body without removing the anticorrosive coating.
The main objectives of the contactless magnetic diagnostic method are:
Under the condition of not changing the technology and function of oil and gas pipeline, the pipeline section which works under the maximum stress and has the tendency of damage is determined.
Determine the excavation location for supplementary detection by metal magnetic memory method or other non-destructive testing methods.
2. System host
1. Host of stress concentration detection system
The stress concentration detection system is a system that uses metal magnetic memory method to measure, record and process the diagnostic data of stress and deformation of equipment and structure. It is used to evaluate the stress and deformation of the equipment according to the special detection method and determine the stress concentration area. The working principle of this instrument is to measure the distribution of the magnetic field Hp on the surface of the object to be tested. The magnetic field intensity is measured in A/m (ampere/meter), and the length counter converts the length value in mm.
The relationship between the distribution of magnetic field Hp and residual stress has been established by this series of instruments. The instrument, together with the developed detection methods suitable for different industrial sectors, provides a new principle and means for the diagnosis of equipment in operation. This instrument is suitable for contact detection of pipelines, non-contact detection of buried pipelines, and other large structural parts.Detect.
2. Instrument features:
● Single-component, two-component and three-component sensors are supported to measure the normal and tangential components of the magnetic field at the same time;
:●. Large color LO display with 800 X 180 resolution allows for more intuitive viewing of data without transferring it to a computer.
● The 45-key keyboard inputs characters and controls the instrument with 7 additional shortcut function keys to simplify the operation:
● The screen directly displays the parameters of each channel, magnetic field distribution map and gradient distribution map:
● It can calculate the d positive figure and calculate the difference gradient of adjacent channels.
● Up to 32 measurement channels, with three recording length detection modes of point measurement, encoder counting and time counting:
● Multi-channel operation, more than a dozen scanning devices can be selected, wide range of applications: different detection purposes can be achieved by replacing the probe
Can be connected to a dedicated scanning device to detect buried pipelines:
Using the natural magnetic properties of metals, no special magnetization of the object to be tested is required:
● No preparation is required for the surface to be inspected, and the inspection can be conducted through the coating;
● Be able to determine the location of metal stress concentration area and defects, and realize the early diagnosis of defects:
● Detection data can be stored and transmitted to the computer:
● 256m storage space, which can save several kilometers of detection data.
● The analysis software M-System is provided, and the data can be processed in depth on the computer.
测量步长（间距）1mm、2mm、4mm、8mm、16mm、32mm、64mm、128mm
测量步长（间距）1mm、2mm、4mm、8mm、16mm、32mm、64mm、128mm
● 32-bit microprocessor, SM memory, faster data processing.
● Scanning speed (when the step is 1mm): 0.2-0.5m/s
● The instrument can be operated on battery power
● The instrument can be used without eliminating the external magnetic field, and it also has the setting to eliminate the influence of the external magnetic field.
● Portable instrument, easy to operate, geometric size 250 x136x48mm, weight 1.2kg: suitable for field operation;
The sensor on the scanning device can be measured without contact with the object to be detected, so as to avoid wear.
The instrument can calibrate the scanning device through the earth's magnetic field.
3. Technical parameters of stress concentration detection system:
Hp value measurement range:±2000A/m
Measure the number of channels:2-32 channels (depending on scanner)
Minimum measurement step:1mm
译:1mm
Maximum measurement step:128mm
Maximum scanning speed (when step size is 1mm):0.2-0.5 m/s
Basic relative error of magnetic field measurement per channel<5%
Relative error of length measurement<5%
Microprocessor:32 bit
Memory capacity8Mb
译:8Mb
Flash capacity256Mb Flash Record Test Result
Liquid product display
LCD color screen, 800x480 resolution
RS-232 interface data transmission speed115 kbps
keyboard52 key
Battery-poweredDC 16V
Operating temperature range-15℃-+55℃
Overall dimensions250×136×48mm
Weight1.2kg
3. Select the scanning device as required
1) 11-12W type: non-contact probe for Trenchless detection of buried pipeline, try to detect with small pipe diameter
The Model 11-12W scanner integrates a three-component magnetic detection sensor and an analog-to-digital converter. The invention relates to a special scanning device for 12-channel underground pipeline detection, which is used for non-contact magnetic detection of oil and gas pipelines at a depth of 2-3 meters underground. Dedicated high-sensitivity scanner with four 3-component sensors and an analog-to-digital converter with a resolution of 0.1A/M. The normal and two tangential component of that magnetic field are measured separately.The four sensors are arranged horizontally, and each sensor contains three measurement channels. The scanning device is designed as a telescopic rod type with adjustable length, adjustable sensor spacing and direction, a fastening device and a counter interface. The length of the rod and the distance between the sensors can be adjusted according to the diameter of the pipe to be detected. An external counter can be used to measure the length during detection.
The 11-12W scanner is also equipped with a measuring wheel. The structure can fully improve the stress concentration area when the pipeline is detected,
The detection accuracy is suitable for detection on a flat road in a city. The scanning device may be used either in a wheeled mode of measurement orTo be removed for separate use.
2) 11-6W: Non-contact probe for Trenchless detection of buried pipelines, trial use of large diameter pipeline detection 11-6W scanning device is a special high-sensitivity scanning device integrated with three-component magnetic detection sensor and analog-to-digital converter. The special scanning device for 6-channel underground pipeline detection is suitable for detecting pipelines with a diameter greater than 530 mm. Can be used for underground oil with the depth of 2 to 3 meters,Contactless magnetic memory diagnosis of gas pipelines. Dedicated high-sensitivity scanning device with two 3-component sensors and an analog-to-digital converter. Resolution 0.1A/M. The normal component and that two tangential component of the magnetic field are respectively measured, the two sensor are arranged according to the height, and each sensor comprises three measurement channel. The scanning device is designed as a telescopic rod type, the length of the scanning device is adjustable, the scanning device is provided with a fastening device and a counter interface, and the scanning device is designed as a telescopic rod type. An external counter can be used to measure the length during detection.
3) Contact detection of pipeline after excavation
Contact inspection and weld inspection: use 1-8M scanning device
8-channel contact seam inspection scanner. Four two-component magnetic detection sensors are used to measure the normal component and a tangential component of the magnetic field respectively, which are used to quickly scan the local stress concentration of the pipeline weld. The scanning device is designed in the shape of a trolley, four sensors are horizontally arranged, and each sensor contains two measuring channels. Sensor spacing, height, direction can be based on the pipe orThe shape of the weld is adjusted with a locking structure. The cable is 1.5 meters long and has an integrated 4-wheel counter to record the detection length.
By measuring the two hyperfield components of the magnetic field at the same time, more comprehensive data can be acquired, and the detection effect during key lifting detection is improved.
4) Large-area high-efficiency contact detection after excavation: use 6-12 type scanning device
12-channel contact-type large-area contact-type detection device with a single scan width of up to 20 cm. 12 single-component magnetic detection sensing
The scanning device is designed in the shape of a trolley, 12 sensors are arranged horizontally, the spacing, height and direction of the sensors can be adjusted according to the condition of the pipeline, and the device has a tight structure. Aluminum support rod, the sensor can be installed on the self-made support rod with different radian according to the diameter of the pipe to adapt to different pipe diameters. The cable length is 1.5 meters. Four wheel linkage encoders are used to record the detection length.
4. MM-System Graphic Software for Metal Magnetic Memory Stress Concentration Detection System
The software M-System is used to deal with the stress and deformation of parts, equipment and structures obtained by metal magnetic memory method.Data.
It is used for the analysis and processing of stress concentration detection data, the output of image and data list, the support of 100 data access files, the adjustment of step length, interval, detection length, two-dimensional, three-dimensional and polar coordinate graphic display.
MM-Systea can process several residual magnetism distribution curves at the same time and manage the curve parameters. According to the residual magnetism square curve (Hp curve), the program will automatically form the Hp functional differential curve (Dx curve) to characterize the stress concentration level. Accordingly, according to the detection method, an ultimate stress concentration region (damage development region),
The MM-System can process the data obtained by the stress concentration detector after the computer is reset,
Data entered directly from a computer keyboard. This procedure also allows for editing of the data.
Depending on the user's wishes, the graph can be printed out on a printer or written in a scanning curve format (BMP) for further processing with the help of other programs (e.g. MS Word).
5. Brief description of the process of using metal magnetic memory method to detect buried pipelines
1. Firstly, the stress concentration detection system of buried pipeline is used to diagnose the buried pipeline by non-contact magnetic measurement.
2. Excavate the area where abnormal signals are found.Mark the position in the.
3.Carry out visual inspection at the excavation and contact detection with the buried pipeline stress concentration detection system, and find the stress concentration
4. Use the buried pipeline stress concentration detection system to determine the exact location of the stress concentration area on the surface of the pipeline.
5. After the anticorrosive coating is removed, ultrasonic flaw detection, thickness measurement and penetration detection shall be carried out in the stress concentration area, weld and adjacent parts to find out the defects and measure the wall thickness.
6.Measure the hardness of the material at the location of the stress concentration zone according to the relevant standards.
6. Application Scope of Buried Pipeline Stress Concentration Detection System
1. External corrosion detection
2. Internal corrosion detection
3. Leakage location
4. Crack detection
5. Abnormal detection of welding relay (as shown in the figure: misalignment of circumferential weld: the measured misalignment has reached 47% of the pipe wall thickness)
7. Detection cases using this technology:
The following is the magnetic field distribution map of the 36m pipeline of the four parallel oil pipelines from the South Reservoir in the first reservoir area of Xinjiang.
Magnetic Field Distribution of Buried Pipeline
Test results
The detection length is about 36 meters, and abnormal signals appear at 23-28 meters from the starting point of scanning. About 8-13m away from the scanning end point, excavation and re-inspection are required.
Pictures of excavation site
After excavation, it is found that there is no anticorrosive coating in the 30cm section.
Corrosion of pipe surface before cleaning
Surface corrosion before cleaning:(Corrosion pit)
After cleaning the surface of the pipeline, obvious corrosion pits were found everywhere.
埋地管道应力集中检测系统
Buried pipe stress centralized detection system
