Single stage centrifugal blower, 500KW drive, discharge pressure about 30 KPag, suction more or less atmospheric. There's a distinct pressure dropoff in the curve as the flow gets low, so surge is likely. Any ideas how concerned I should be about machine damage?.. the low pressure and low pressure ratio suggest that the risk may not be as high as with bigger machines.
Compressed material is not nice, unfortunately, so a simple blowoff on the discharge isn't an option.