Local surface hard spots, a few tenths of a millimeter thick, but with immense differences in hardness compared to the remaining surface, were a feared problem in linepipe plates for sour-gas service, as it had previously been impossible to control them. With D-TECT, the leading heavy plate manufacturer Dillinger developed an inspection technology integrated into the production process that automatically inspects the plates for these hard spots.
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Read the article online at: https://www.worldpipelines.com/special-reports/13092018/dillinger-searching-out-the-hidden-facts/