Higher sophisticated products and unsteady charge materials require an economically optimized BOF-Process operation. Installing a CIP-System (Converter-Inertgas-Purging) enhances the performance of the top blowing BOF-Process (original LD-Process) from the metallurgical and procedural point of view. The CIP-System consists of twelve independent and separate controllable MHP24 plugs (Multi-Hole-Plugs) in ecliptic bottom arrangement. This thesis evaluates the advantages of inertgas bottom purging in direct comparison to a top blowing vessel (232 t tapping weight). Process adjustments (e.g. slag, fluxes, blowing and purging pattern) are discussed. Maintenance philosophies and their influence on the availability of the bottom purging are considered as well as down-times and total gas amounts on the metallurgical results.