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- W4385887381 abstract "This project investigated and upgraded the digital filtering used to interpret NoPig displacement data. This upgrade should allow the system to be used on long seam welded pipes. Limited laboratory testing was performed to show the improvement on ERW pipe. The NoPig method is a non-destructive testing method for unpiggable pipelines which uses above ground measurements for detecting and sizing wall thickness anomalies like corrosion. The method uses an applied current containing several distinct frequencies between two points on a pipeline up to 1 km apart. The resultant magnetic field is measured above ground along the pipe. The measurement data is processed to determine the deviation of an equivalent current line from the center of the pipe, called displacement. Due to the skin effect and the magnetic stray flux, variation of the displacement with frequency indicates a local wall thinning of the pipeline. ERW-pipes produce an offset in displacements caused by different magnetic and electric properties in the area of the long seam. This offset changes from joint to joint because the clock position of long seams in neighboring joints is different. In order to detect defects this offset must be filtered or removed from the data. The filtering procedure and software developed in this project significantly enhances the probability of detection in ERW pipelines over previous filtering schemes. Additionally upgrades in the system hardware reduced uncertainty in the definition of displacements. In the limited data set of a few pipe joints possessed at NoPig�s Hildesheim offices, defect detection was improved from 45% to 90% in and ERW pipe with artificial defects. Although these results are very encouraging a larger more controlled test is needed to determine the probability of detection for the NoPig system in long seam welded pipe." @default.
- W4385887381 created "2023-08-17" @default.
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- W4385887381 date "2005-02-25" @default.
- W4385887381 modified "2023-09-25" @default.
- W4385887381 title "L52199 Nopig Metal-Loss Detection System for Non-Piggable-Pipelines" @default.
- W4385887381 doi "https://doi.org/10.55274/r0011343" @default.
- W4385887381 hasPublicationYear "2005" @default.
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