FINITE ELEMENT ANALYSIS OF VESSEL NOZZLE FOR AGITATOR SUPPORTS

摘要

There are many industrial applications involving agitators/mixers supported by a vessel head and nozzle. The flow-induced agitator loads are often neglected or only partially considered in the vessel design stage. Inadequate supports reduce agitator drive operating life and in most cases promote vibration problems leading to fatigue failures. The vessel head and nozzle should be stiff enough to withstand the induced agitator loads. Some of the more significant design criteria are: 1) Nozzle and head stiffness should be at least 1 million lb/in. 2) Agitator shaft deflection should not be more than 1/32 inch per foot of shaft extension. 3) Agitator support plane should not rotate more than 0.15 degree. This paper deals with a parametric finite element study of three tank sizes (4 ft., 8 ft. and 12 ft. diameter) to verify the validity and ease of compliance of these criteria in vessel design.