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Dołączył: 29 Paź 2010
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 Wysłany: Czw 10:24, 30 Gru 2010 Temat postu: glätteisen ghd MsM ultrasonic guided wave in pipe |
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MsM ultrasonic guided wave in pipe corrosion detection of
5% of the amount of monitoring defects perforated pipe cross sectional area of the sensitivity loss of up to 0.6%; detection range, the paint layer to the ground with a straight pipe, you can detect a one-way pipe cross-sectional area loss l5O m volume of 2.3%; can detect high-temperature corrosion of pipes, and long-term online monitoring, the maximum temperature up to 938oC: pipe diameter from 1.5 inches to 8O inches (can be adapted to infinite diameter pipe): For detection of blind the size of a check used by gang Zhao Hong: MsM ultrasonic guided wave in pipe corrosion measured in the application of picking up 29 test frequency: 2KHzEI'j \; blind than three times the wavelength of guided wave slightly larger: the coupling between the probe and the pipeline in two ways: mechanical coupling with the epoxy dry adhesive connection, the outer surface of the pipeline on the good state (no or slight corrosion pits ),[link widoczny dla zalogowanych], dry recoverable mechanical coupling; for a number of pipe surface pits, do not allow the case of grinding, epoxy resin adhesive can be connected way. '~. / \,. / / \'= / T /. / M �� Fan l: Pi Li Wa School: figurines: If Ding {cream ii: tI,[link widoczny dla zalogowanych], {j shouting match m Swiss building: Aiming �� i_, = l yu j: j} grass-augmented soil wow {II I head meal : 111 130 Zhaoqiu Hong: MsM ultrasonic guided wave in pipe corrosion detection of 'I''a}} l a luxuriant I_: j;. : A'J core 0 ��. i_ a - a. :. . . . . 2MsM ultrasonic guided wave testing of laboratory test selection diameter 2.1 102mm, 6mm wall thickness of the pipe,[link widoczny dla zalogowanych], corrosion pits were simulated in the above, pinhole corrosion and fire ring to crack the three typical defects: drill diameter 1Omm,[link widoczny dla zalogowanych], depth 4.26mm to simulate the drilling pits defects, equivalent to 2% of the pipe cross-sectional area of metal loss, as shown in Figure l; drill diameter of 4mm, 1.9mm depth simulation of micro-hole pinhole corrosion defects pipe cross-sectional area equivalent to 0.7% metal loss, shown in Figure 2; were grooving in the lateral wall 2, the equivalent of 1% and 2.5 pipe cross-sectional area of metal loss. Ultrasonic guided wave testing results shown in Figure 3 shows, four defects were apparent in the waveform on the display. 2.2 Ultrasonic Guided Waves actual pipeline research and testing in the laboratory to obtain a certain effect, select a chemical company in Tianjin a propylene pipeline pressure pipeline full inspection work, which uses guided waves to detect corrosion missing (on the next section 5 depression. Pipe diameter of 76mm, thickness 3.5mm, have been using the past 2O years: model SR3O3O instrumentation systems, test frequency to 32K. Results show that the existence of many minor corrosion defects in pipelines, wells successfully detected three pits like the more serious defects. D1 is shown in Figure 4 at which a more serious defects in ultrasonic guided wave-shaped figure,[link widoczny dla zalogowanych], after the department confirmed by other means of detection depth has reached the wall thickness of the corrosion pit depth of 28.5%, if not promptly repair may result in greater potential safety problems or accidents. 3 summarizes the theoretical analysis, laboratory research and practical pipeline inspection certificate, MsM ultrasonic guided wave testing technique has a high detection accuracy and faster detection speed, applicable to all kinds of pressure on long distance pipeline inspection. But given the type of ultrasonic guided waves for defect-sensitive features of the volume, pressure piping inspection and testing should also be integrated to other detection techniques. (
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