Artificial visual inspection: lighting conditions, standards, experience, marking, pipeline rotation.
(2) Nondestructive testing.
One. Ultrasound Detection of UT
More sensitive to various materials are uniform surface cracks and internal defects.


Bay Electromagnetic Induced Eddy Current Testing ET
It is mainly point (hole) defect sensitive.


C. Magnetic MT and Magnetic Leakage Examination
It is used to detect surface and near surface defects of ferromagnetic materials.


D. Electromagnetic Ultrasound Detection
It can be used to inspect the surface of high temperature, high speed and rough dry pipes without coupling medium.


That is, penetration test
Fluorescence, colouring, testing steel surface defects.