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Recently I engage an M&V company to audit my compressors.
1. My compressor GA145 actually consume about 168kW at full load and the flow measured at outlet port is actually 10% lower than original stated in catalogue
2. The compressor is 7 years, and we did an overhaul about 2 years ago.
3. Also, the measured result showed the efficiency of the compressor drop to 7.9 kW per m3/min over 2 days measuring period ; means the efficiency is 21% poorer than the original full load efficiency.
I am planning to replace this unit, now that i have actual data in hand.