Article 9 categorizes visual examination into two primary methods based on the inspector's access to the surface: Direct Visual Examination
One of the most critical aspects of Article 9 is the specification of lighting and visual acuity.
: Accurate inspection is impossible in the dark. Article 9 typically mandates a minimum light intensity, such as 100 foot-candles (1000 lux) , to reveal fine cracks or corrosion.
Performed when the eye can be placed within 24 inches (600 mm) of the surface at an angle no less than 30 degrees.
Here is a detailed breakdown of the key components of ASME Section V, Article 9.
