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See Chinese contents: NB/T 47013.5-2015 NB/T 47013.5-2015: Nondestructive testing of pressure equipments - Part 5: Penetrant testing
This Part of NB/T 47013 specifies the liquid penetrant testing method and quality grading of pressure Equipment. This Part applies to the testing of surface-breaking defects which are caused in the manufacture, installation and use of pressure Equipment made of non-porous metallic materials.
