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In doing so, the pressure is reduced from the suction vessel to the compressor flanges. In the discharge system the objective is to push the required amount of flow through the system resistance to achieve the final discharge system terminal pressure. This pressure may be in a vessel, may be in a ship or could be in a pipe line. ) from the terminal point (delivery point) back to the compressor discharge flange. An important point to remember is that the compressor differential head or energy required is the net effect of the discharge system resistance and suction system resistance.
Think of any compressor, dynamic or positive displacement, compressing a volume of one actual cubic foot per minute and let us assume that the temperature of compression remains constant. If the particular compressor in question has a compression ratio of two, one actual cubic foot per minute entering the compressor will be compressed to a discharge volume of exactly one half cubic foot per minute assuming that the gas is dry. Standard volume is defined as one volume always referenced to the same pressure and temperature conditions.
Since compressor performance must consider gas velocity, actual flow is always used for design. 4 shows the concept for actual volume flow. The volume flow changes directly with temperature and inversely with pressure. 4 Volume Flow 17 Principles of Rotating Equipment Standard volume and mass flow are used to describe process conditions. If there is not any condensate formed within a compressor section, the standard and mass flow through a compressor remains unchanged. 5. " CU. FT. or ONE NORM.