Загрузка...
A minimum light intensity of 100 foot-candles (1000 lux) is required on the surface being examined. This applies to both natural and artificial light sources.
This occurs when the technician has an unobstructed, straight-line path to the test surface. It relies entirely on the natural human eye, augmented only by basic, non-electronic tools like mirrors, magnifying glasses (usually up to 10x magnification), and welding gauges. Remote Visual Examination
One of the most critical aspects of Article 9 is the specification of lighting and visual acuity. asme section v article 9
:
:
under clause T-940. Surfaces must be clean, dry, and free from grease, weld spatter, or flux that could hide defects. Lighting Intensity
The eye must maintain an angle of no less than 30 degrees relative to the surface being examined. A minimum light intensity of 100 foot-candles (1000
Human vision is highly dependent on environmental factors. Article 9 enforces strict constraints on illumination and viewing angles to eliminate human error during testing. Light Intensity (Illumination)