: If nitrogen isn't used, maintaining the air at a very low dew point to ensure liquid water cannot form on the metal surfaces.

: Keeping oxygen out by maintaining a positive pressure of dry nitrogen within the equipment.

NACE standards are copyrighted and generally require purchase. You can obtain the most recent version (reaffirmed in 2018) as a downloadable PDF through the following authorized platforms:

The full title of the standard is .

The standard outlines several mandatory and recommended procedures to prevent PTA formation or neutralize it before damage occurs: