Fx - relief port area (M2); <br>Qx - average extinguishing agent spray discharge rate (kg / s) of a protected area; <br>Pf - the envelope withstand the pressure allows a pressure (Pa).
Fx - pressure relief port area (m2);<br>Qx - the average spray rate of fire extinguishing agents in the protective area (kg/s);<br>Pf - The enclosure structure is subject to the permissible pressure (Pa) of the internal pressure.
FX - area of pressure relief port (M2);<br>QX -- average spraying speed of fire extinguishing agent in the protection area (kg / s);<br>Pf -- allowable pressure of the enclosure under internal pressure (PA).