Sprayed "around" each new joint with an audible flow of helium for ~25 seconds duration -> Access to several joints was impeded by various obstructions and, in many cases, I could not apply the helium to the test slots etc. -> No flanges were bagged and this exercise should not be considered a definitive test but should have revealed any significant offenders.  

LD indicated baseline signal was "offscale" < 10-11 torr*L/sec for the 1st half of testing -> I guessed the time constant to be ~100 seconds for this V/S -> to validate the less than one time constant application duration I verified that the baseline helium indication was legitimate by spraying the O-ring at the inlet to the LD and observing the permeation.  The signal rose to a high of 8 x 10-9 torr*L/sec over the course of 60 minutes -> I let the signal decay to < 8 x 10-10 torr*L/sec before resuming and testing the remaining joints