What is the thrust rating, torque and bending moment capacity of the impeller hub(s)? What are its factors of safety?.What is the calculated shear stress of the impeller shaft and what factor of safety is there from the yield value?.
What is the assumed bearing support stiffness of the mixer mounting structure?.Is operating at less than 75% of first critical speed?.What is the critical speed of the impeller shaft assembly?.How does one determine the mechanical integrity of a low speed, turbine agitator? For the sake of brevity, I have posed the following questions. Three Aspects of Evaluating a Mixer Design However, if a manufacturer has specific experience or specific tools to analyze a given mixing problem, those would tend to objectively lower the risk of a mis-applied mixer design. Are they truly unique and determinatively important toward reaching the end user’s overall intent? Or are the stated features non-essential to the overall performance, durability and value of the system? Are these unique features truly beneficial or are they to limit competitive pressure? For example, arcane details within a specific gear reducer design or who makes the gear reducer would tend to lower competitive pressure on pricing and technical qualification. Mixing effectiveness is most precisely defined as the “degree of mixedness or the removal of gradients in the fluid properties” (Uhl and Gray, Mixing, Academic Press 1967.)Īnother important consideration would be the technical review of a particular vendor’s features. Specifically, these three interrelated areas of design are, mechanical integrity, mixing effectiveness and integration of the mixer to the tank mounting structure. Customer Question: How are industrial agitators and blender designs evaluated and how can I be sure that my process goals will be met?Īnswer: There are three inter-related, but distinct subjects that need to be addressed in order to answer your excellent question.
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