COMPONENTS OF THE CENTRIFUGE

The electric motors are often the noisiest component of the centrifuge assembly. Most standard motors in the 75—250 kW range develop noise levels of 85 dbA (weighted sound pressure level using filter A, per the ANSI standard). A quiet motor can reduce this level by 5 dbA and should be used whenever noise is of concern. 

In order to study secondary components of the centrifugal flow field, it is also interesting to look at the ratio... 

The stress resulting from the axial forces must be considered in analy2ing the parts which resist axial separation, such as bolts, nuts, rings, etc. On scroU centrifuges the axial force owing to the axial component of the conveyor torque must also be considered. 

The net transport of component A in the +2 direction in the centrifuge is equal to the sum of the convective transport and the axial diffusive transport. At the steady state the net transport of component A toward the product withdrawal point must be equal to the rate at which component A is being withdrawn from the top of the centrifuge. Thus, the transport of component is given by equation 72 ... 

The useful parameter for value analysis is the installed cost of the number of centrifuges required to produce the demanded separative effecd (end product) at the specified capacity of the plant. The possible benefits of adjustments in the upstream and downstream components of the plant and the process should be carefully examinee in... 

The final element of the equipment description is the equipment boundary figure. A boundary figure is included with each data cell to define the components and limits of the equipment associated with that cell. For example, the data cell boundary figure (Data cell 3.3.7.2.1.1) in Figure 3.2 shows that the centrifugal pump, seal system, motor, motor control unit, lube oil system, coupling, and transmission are all components of the equipment in the data cell. The equipment boundary is inherently reflected in the taxonomy number. 

By definition, the angle between the z-axis and the radius vector R is equal to 6. At the same time, the gravitational field can be represented as a sum of the attraction force and centrifugal one, and it is almost opposite to the radius vector. Therefore, the radial component of the field is... 

In accordance with Equation (2.338) the determination of the figure of fiuid equilibrium is reduced to the following problem we have to find such a surface of the fluid, S(x,y,z), that its partial derivatives should be proportional to the corresponding components of the acting force. As we pointed out, when a fluid rotates uniformly around the same axis the total force can be represented as a sum of the attraction and centrifugal forces, and the former depends on the shape of the fluid mass in a rather complicated way. Besides, in the case of an inhomogeneous fluid the potential of the attraction field depends on the distribution of a density of a fiuid and for this reason this problem becomes even more complicated. 

In the previous section we found components of the attraction field due to masses of a homogeneous spheroid. Equations (2.326 and 2.327). Correspondingly, the components of the gravitational field which include the influence of the centrifugal force are... 

A centrifuge tube is filled with the sample and centrifuged at a speed high enough for all the components of the sample to achieve their maximum velocity. The components begin to separate out, leaving clear solvent (supernatant)... 

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