T/GDASE 0055-2024 The specification for partial corrosion pulse-induced eddy current testing of equipment with encapsulation layers

Scope

Main technical content: This document specifies the terms and definitions, detection principles, general requirements, on-site detection, display and verification of detection results, and basic requirements for detection reports of local corrosion pulse eddy current detection on equipment with cladding layers. This document is applicable to the detection of local small-volume corrosion thinning of the base material of equipment with cladding layers that meet the following conditions simultaneously: a) the thickness of the cladding layer under non-ferromagnetic metal protective layers such as aluminum skin is less than or equal to 200mm, and the thickness of the cladding layer under ferromagnetic metal protective layers such as galvanized iron skin is less than or equal to 100mm, with the wall thickness of carbon steel and low-alloy steel ferromagnetic materials ranging from 2mm to 100mm; b) the temperature range of the workpiece is -196℃ to 500℃; c) the curvature radius of the pipe is not less than 50mm. This document is applicable to the detection of metal base material wall thickness loss caused by local small-volume corrosion on equipment with cladding layers. For the detection of local small-volume corrosion thinning defects with an area less than 50mm×50mm, after process verification, this document can be used as a reference. This document is not applicable to the detection of pinhole corrosion, pitting corrosion, and crack-type defects. This document does not specify a grading classification for defect severity. The specific evaluation grading principles shall be determined by mutual consultation among all parties to the contract.

Development Information

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