For equipment such as crude oil storage tanks, separators, and heat exchangers, 3D measuring industrial endoscopes can obtain three - dimensional parameters (such as diameter and depth) of corrosion pits on the tank body, the propagation range of weld cracks, quantify the peeling area of the lining layer, evaluate the scaling thickness and flow cross - section shrinkage rate of heat exchanger tubes, and ensure the pressure - bearing safety of the equipment.