Patent ID: 7094019

Claim:
A unique method of anti-surge protection for turbo compressor systems, the method comprising: monitoring a compressor rotational speed or guide vanes position; monitoring a compressor inlet temperature; monitoring a compressor inlet pressure; monitoring a compressor outlet pressure; calculating a compressor pressure ratio at surge limit conditions for the current inlet temperature, wherein a compressor ratio is based upon a ratio of the current inlet temperature to the given inlet temperature associated with the pressure ratio at the surge limit conditions and the pressure ratio at the surge limit conditions for the given temperature: calculating a compressor pressure ratio at current operating conditions; comparing the compressor pressure ratio at the current operating conditions to the compressor pressure ratio at the surge limit conditions; and opening an anti-surge valve when the comperssor pressure ratio at the current operating conditions approaches a pre-determined safety margin within the compressor pressure ratio at the surge limit conditions to minimize the possibility that the turbo-compressor would experience a surge.