Analysis of the influence of flow meter error on surge control of compressor

Flowrate of gas is one of the most important parameters in the surge control of compressor. If flowmeter works with error, the reliability and stability in surge control of compressor will be affected. By analyzing the characteristic curve of compressor, a surge control model is established. Also, the analysis of flow meter error on surge control shows that the surge proof valve remains when positive error is small, the surge happens when positive error is big. However for the compressor, severe consequence will produce if the surge control system is at sleeping state. At negative error of flowmeter, the work efficiency of compressor will come down when the surge control system is activated in advance and the surge proof valve is closed behindhand. It is suggested that the flowmeter whose absolute value with maximum relative error exceeds 2% should be replaced in order to meet the needs of surge control of compressor.