NF A49-872:1987 STEEL TUBES. NON DESTRUCTIVE TESTING METHOD. AUTOMATIC EDDY CURRENT TESTING USING ENCIRCLING COILS FOR IMPERFECTIONS AND LEAK TIGHTNESS.
1996NF A49-875-1:1996 Non destructive testing of steels tubes. Part 1 : automatic electromagnetic testing of seamless and welded (except submerged arc welded) ferromagnetic steel tubes for verification of hydraulic leak-tightness.
1987NF A49-872:1987 STEEL TUBES. NON DESTRUCTIVE TESTING METHOD. AUTOMATIC EDDY CURRENT TESTING USING ENCIRCLING COILS FOR IMPERFECTIONS AND LEAK TIGHTNESS.