This part of GB/Work 34370 specifies the magnetic flux leakage testing and result evaluation methods for amusement facilities. This part applies to the magnetic flux leakage of ferromagnetic material components such as steel pipes with an outer diameter of not less than 38 mm and a wall thickness of not more than 20 mm, steel plates with a thickness of not more than 20 mm, and steel wire ropes and cables with a diameter of not less than 6 mm for amusement facilities. detection.