Vacuum Box Testing (LT) is a non-destructive examination used when trying to locate weld seam leaks. A vacuum box and compressor create a high or low pressure vacuum while a detergent solution is applied to the test.


  • Provides immediate indication visual of the location of any leaks present.
  • It can detect small leaks within a given area.


  • Size and orientation of any leaks will have to be analyzed with a secondary NDT method.
  • Surface temperature of the test material must be between 5 and 50 degrees Celsius.