of impeller is decided by finding the ratio of (height of liquid level * sp. Let me put forward my views and plz correct me if wrong. Length of Agitator Shaft = distance between bearing & agitator (lower impeller) Thus, Impeller Clearance is Z/3 or T/3 based on the above table. Viscosity, cP (Pa.s):: Max Level, Z/T:: Number of Impellers:: Impeller Clearance (Lower : Upper) This method takes into consideration liquid level (Z), tank diameter (T), number of impellers and fluid viscosity. (Ref.: EEUA, page 5).Īnother method to determine lower impeller clearance is given in "Handbook of Chemical Engineering Calculations" By - Nicholas P. Per unit volume increases as the filling ratio departs from unity. Liquid, however, a filling ratio of 2 is recommended in order to maintain a sufficiently long period of contact between the gas & the liquid. The filling ratio is the ratio of Liquid Depth to Tank Diameter, which is normally between 0.5 - 1.5. Ratio of bottom clearance to vessel diameter should be between 0.1 - 0.4 for a filling ratio of 1.0īut for an Anchor Impeller, clearance is determined by mechanical considerations a clearance of 1in. Referring to procedures laid down in Engineering Equipment Users Association (EEAU) handbook, EEUA HAND BOOK NO.9,Ĭlearance between Impeller & the bottom of the tank:
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