The invention relates to ammonia synthesis loops containing gases, which do not react and would accumulate if they were not purged out. The visual representation is captured by a device and provides a specified status of the object. Elimination of such long crossbars reduces the RC delay of the crossbar and generally improves performance and speed. The lower zone optimizes engine airflow characteristics while the upper zone is optimized to minimize blade tip gap and wear by being more easily abradable than the lower zone.