Equipment Selection Criteria and Guidelines

Equipment Selection Criteria and Guidelines A number of factors should be considered in order to determine when to select a blowdown drum, cyclone separator, or quench tank to handle a multiphase stream from a relief device. Among these are the plot plan space available, the operating limitations of each type, and the physicochemical properties of the stream. 

Selecting dispersion equipment for a specific application is a complex task. Dispersion of the mixture must be complete and the process and equipment must meet economic constraints. But much more is involved. In practice, such simple criteria are complicated by a variety of parameters related to fillers and to the materials in which they are dispersed. These parameters complicate the problem to the degree that it is not easy to formulate general guidelines. In this discussion we will consider the available equipment types most frequently used for filler dispersion and illustrate their applicability with some examples. 

The handling system suitable for the production conditions (e.g., existing product lines and planned number of units) also has to be selected. Guidelines for these process steps are VDl 3712 Determining the Machine Capability of Dispensing Sj tems and VDl/VDE 2251 Precise Mechanical Elements Connections Survey. The production structure partial model is also detailed at this stage. Equipment available in the company is analyzed and selected. The choice is restricted by product requirements such as the size of the module and the temperature resistance of the electronic components. Vapor-phase ovens, for example, make for much better precision and uniformity of temperature distribution. Process parameters such as placement sequence and temperature-transient control are defined for the individual items of equipment. Criteria include the nature and mass of the electronic components and the melting point of the solder. 

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