Vacuum Box Testing
Vacuum box testing is a technique used to examine welds on pipes, pipelines, and other surfaces for leaks. This non-destructive test applies pressure in the form of a vacuum to the weld, and allows for visual detection of leaks.
A detergent solution is applied to the weld so that a leak site will indicate bubbles. A rectangular seal with a clear view of the weld, uses a compressor to create a vacuum that will cause any leak to produce visible indications of bubbles. These are very quick to apply tests that use repeated examinations in section sizes that are equal to the size of the testing device.