Definition(s)
Inert Entry
Entry into a confined space with an inert atmosphere starts as soon as any part of the entrant’s body breaks the plane of an opening into the space and triggers the need for rescue capability. “Entry” includes all subsequent activities in the inert confined space.
Source: API Standards 2217A, Guidelines for Safe Work in Inert Confined Spaces in the Petroleum and Petrochemical Industries, Fourth Edition, July 2009. Global Standards