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Screw Compressor Motor Overload Tripping

Hi! We have six oil flooded screw compressors installed at our plant for instrument and plant air unit. All four have rated pressure of 8.5 barg however four of them having 42 m3/min flowrate while one has 12.5 m3/min and last one has 7 m3/min. During parallel operation recently, we are experiencing motor overload tripping for both small compressors. It it due to back pressure of big compressors having high flowrate causing small compressors to overload or there can be other reason for this?

 

 

RM
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