Answer
FSS code 2.2 CO2 system
40% of gross volume of the largest machinery space so protects excluding casing above the level at which horizontal area of casing or
Less of the horizontal area of the space concerned taken midway between the tank top and lowest part of casing or 35% gross volume of largest machinery space including casing
Free volume of CO2-0.56 cubic m per kg
85% of CO2 g as to be discharged within 2 minutes
Shall be such as to ensure that atleast 2/3rd of the g as required for relevant space shall be introduced in 10 min.