Specific of packing

Equations taking into account the specificity of packing of filler particles were proposed in a somewhat different form by Hawksley [18]... 

The HETP value used for final specification of packed depth should be based on the same vapor/liquid equilibrium, equation of state, and physical properties as used in the calculation of the required number of theoretical stages. For easy separations (less than 10 theoretical stages), a 20% design safety factor can be applied to a typical HETP value without severe economic penalty. For separations requiring 15 to 25 theoretical stages, a 16% design safety factor commonly is applied to the HETP value. For more difficult separations, the design HETP value used must be as precise as possible. 

Packing comes in many forms, sizes, and materials of construction in order to meet all the needs of industry. And there are specific styles of packings to satisfy specific needs. The most common fibers used in the construction of packings include Asbestos, Linen, Ramey, Jute, Cotton, Paper, Wool, Hair, Nylon, Rayon, Teflon, Fiberglass, Carbon... 

Packing corroded away (twice). Poor separation. Pieces of packing in pump suction. Wrong metallurgy specification error. 

Large active exposed surface area the specific surface area, e.g., the exposed surface area of the packing per cubic foot of packed volume, is important since larger specific area means a larger area available for contact between the liquid and the gas, resulting in more efficient scrubber operation. 

The styrene-divinylbenzene matrix of the Styragel packings is chemically very inert, which makes this family of packings useful for a broad range of applications. The chromatographic conditions for the analysis of many polymers have been worked out in detail. A more specific discussion of the solvents recommended for the different polymer types is included in Section III,A,4. 

Other specifications of the porous materials that affect the performance of HOPC include pore volume. A larger pore volume, or equivalently closer packing, of the porous materials increases the ratio of the volume of the stationary phase to the volume of the mobile phase. The difference causes a shift in the segregation boundary in the partitioning and a change in the resolution. 

For these sizes use no more than 10 feel of packed depth unless designed for specific load requirement... 

Values based on > 43 ft /ft specific area of packing. By permission of Mass Transfer, Inc, Bull. TP/US/Bl (1978) and Glitsch Bull. No. 345. 

AP = specific pressure drop, in. water/ft of packing APpb = specific pressure drop through dry bed, in. water/ft of packing Vs = superficial gas velocity, ft/sec pg = gas density, Ib/ft ... 

Specific efficiency of packing nt/H = 5, theoretical trays/meter... 

Due to the unique HETP characteristics, it is important to consult the manufacturer on the specific system involved and operating conditions. Care must be exercised in selecting these or any other type of packing since plugging with suspended solids, polymer formation on surfaces, and similar mechanical problems can influence performance and life of the packing system. 

The operation of packed towers under -vacuum conditions is not well defined in the literature. However, the work of Hands and Whitt [33] specifically evaluates several systems operating from 20 to 760 mm Hg abs. Their recommended limiting -vapor velocity is... 

Uniformity of packing surface on a specific random element of packing [90]. 

Soil specific weight is the measure of the concentration of packing of particles in a soil mass. It is also an index of compressibility. Less dense, or loosely packed, soils are much more compressible under loads. Soil specific weight may be expressed numerically as soil ratio and ptorosity (porosity for soils being basically the same definition as that for rocks discussed earlier in this section). Soil porosity e is... 

The PETN Detonation Pressure, P (also called the CJ Pressure), is shown as a function of packing density in Table 7 and in Fig 4. Note that the measured P values in Fig 4 lie quite close to the theoretical curve developed by Lee Homig (Ref 72), which is based on a Wilkin s type equation of state (see Vol 4, D294-L) with a Grueneisen ratio, r, for the detonation products, that is solely a function of specific volume. Shea et al obtained an effective T = 8.077 p-12.288 (Ref 74)... 

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