Under normal shop or field conditions at a differential pressure of one atmosphere (101 !cPa or 14.7 psig), a pressure bubble leak test enables the detection of leaks and leakage as large as:

weld cracks 76 rnm (3 in.) long and 0.25 mrn (0.01 in.) wide

pinhole 0.4 rnm (0.02 in.) diameter

10 std cm3Â·s-1.

all of the above could be detected