National Turbine - Model NT551 - Multi Stage Centrifugal Blowers - Brochure

Number of Stages : 1 through 10 Inlet Connection : 5” (127 mm) Flange, ASA 125# Drilling Outlet Connection : .5” (127 mm) Flange, ASA 125# Drilling Operating Speed : 3550 RPM Maximum Casing Pressure : 20 PSIG (1.41 kg/cm2) Seals (air) : Labyrinth Seals (gas) : Packing Gland (Special Seals Available) Bearings : Ball, 10-Year Minimum Life per AFBMA B-10 Standard (Made in U.S.A.) Lubrication : Grease (Standard) or Oil (Optional) Impeller Diameter : .22” (558.8 mm) Impeller Tip Speed : 20,447 FPM (6,232 m/min) First Critical Speed : 4505 RPM (10 stages) Direct Drive : Direct Coupled (belt drive available) Max. Vibration Spec : 0.25 in/sec (ISO Overall Spec.), 1.25 Mils Peak to Peak Shaft End : 1.625” (41.28 mm) Diameter, Inlet Drive Standard Noise Level : Compliant With OSHA Standards (Certified test available)