Patent ID: 7854270

Claim:
An inertization method for reducing the risk of fire in an enclosed protected area, in which the oxygen content in the protected area is maintained for a defined period at a control concentration (RK) below an operating concentration (BK) by feeding an oxygen-displacing gas from a primary source; wherein the control concentration (RK) and the operating concentration (BK) are lowered so far below the design concentration (AK) defined for the protected area that the growth curve of the oxygen content reaches a limit concentration (GK) defined for the protected area only in a predefined time when the primary source fails, the margin between the design concentration (AK) and the operating concentration (BK) corresponding to a failure safety margin (ASA), and wherein the control concentration (RK) corresponds to the limit concentration (GK) less the failure safety margin (ASA) and a safety margin (S), such that the oxygen content in the protected area is reduced to the control concentration (RK) which is so much lower than the limit concentration (GK) that the growth curve of the oxygen content reaches the limit concentration (GK) only after a certain period of time in the event that the primary source fails.