Vacuum box testing or Bubble leak testing is one of the NDT (Nondestructive testing) methods used to detect leaks in welds and confirm the weld quality. This inspection process is recommended by international standards.

Vacuum box

is a portable box having a viewing window large enough to view the complete test area and to allow sufficient light to enter the box for proper examination. The box used, shall be capable of producing and holding a pressure differential of 5 to 12 psi.

Overlap, corner and flat vacuum boxes, offered by AL ASAS to do vacuum test for tanks ( bottom plate, shell to bottom, pantoons,… ).