TURBO COMPERESSORS ARE DRIVEN BY TURBINES. ACCORDING TO THESE SYSTEMS, TURBINES ARE COUPLED TO COMPERESSORS DIRECTLY IN ORDER TO INCREASE OR DECREASE EXTERNAL PRESSURE. COMPERESSOR SPEED IS JUST ADJUSTED VIA TURBINES AND THERE IS NO NEED OF USING GEAR BOXES. NOT ONLY THESE KINDS OF COMPERESSORS ARE GENERALLY USED IN TRANSMISSION LINES AND STATIONS TO BOOST THE PRESSURE, BUT ALSO THEY CAN BE USED FOR OTHER PURPOSES ACCORDING TO VARIOUS DESIGNS SUCH AS LOWER RANGE PROCESS COMPERESSORS.