55.2. aDD a NoNFlammaBle, NoNreactIVe (INert) gaSto taNK heaD SPaceS
Using an inert gas such as nitrogen, if done correctly, is effective in reducing the potential
for an ignitable incident (explosion) as it renders tank head spaces incapable of supporting
ignition from a static spark.
However, because this practice can produce oxygen-deficient
environments inside tanks, extreme caution should be exercised when opening tanks for
routine inspections and maintenance