Design data charts

The maximum temperature cross which can be tolerated is normally set by rules of thumb, e.g., FrSQ,75 °. It is important to ensure that Ft > 0.75, since any violation of the simplifying assumptions used in the approach tends to have a particularly significant effect in areas of the Ft chart where slopes are particularly steep. Any uncertainties or inaccuracies in design data also have a more significant effect when slopes are steep. Consequently, to be confident in a design, those parts of the Ft chart where slopes are steep should be avoided, irrespective of Ft 0.75. 

A shortcoming of the GPDC interpolation data chart procedure is that it replaces a single correlation chart by an atlas. The interpolation charts consume more storage space In the design manual or on the computer and require a greater updating effort. 

The data, chart, and discussion points presented in this application section are based on several trials conducted at the PCS plant in Payson, AZ, ntilizing their pulsed combustion spray dryer technology. The trials were not specifically designed for this documentation, so some definitive protocols cannot be provided. However, we investigated how several parameters such as contact and exit temperatures (components of the dryer operating envelope), flow aid level, and percentage of feed solids affected capsule integrity as measured analytically and presented as % free core. 

Other researchers have similar models of design representation Gajski and Kuhn s Y-chart [GajskiSS], and Knapp and Parker s Design Data Structure (DDS) [Knapp84] are two other examples. The three models are compared in a later section of this chapter. 

When design data, such as allowable stresses, are requested for a new material, that is, one not presently in the code, extensive information must be supplied to the Code Committee for evaluation. The ASME Code Committee lists this information to develop allowable stresses, strength data, and other required properties for accepting a new material into the code. Each section of the code contains an appendix listing these requirements such as the one for the ASME Code, Vni-1, in Appendix F. The code also provides data to establish external pressure charts for new materials this is given to those who want to establish new external pressure charts. The required information is given in Appendix G. It is the person s responsibility requesting the addition to supply 1 the data needed to establish those properties required in the code. 

Critical GLC s can usually be calculated based on a unstable atmosphere, thus enabling the designer to determine a worst case scenario. For any given day, typical atmospheric stabihty data can usually be obtained from a local weather bureau, or may be estimated from the so-called Pasquill chart for the appropriate Atmospheric Stability Class (refer to Table 1). 

The performance and design information in Glitsch reference [104], as for all the other manufacturers with respect to their data and charts, is proprietary, but not necessarily warranted to be suitable for the designer s service/applications unless verified by the manufacturer s representatives. 

In order that hot condenser water may be re-used in a plant, it is normally cooled by contact with an air stream. The equipment usually takes the form of a tower in which the hot water is run in at the top and allowed to flow downwards over a packing against a countercurrent flow of air which enters at the bottom of the cooling tower. The design of such towers forms an important part of the present chapter, though at the outset it is necessary to consider basic definitions of the various quantities involved in humidification, in particular wet-bulb and adiabatic saturation temperatures, and the way in which humidity data are presented on charts and graphs. While the present discussion is devoted to the very important air-water system, which is in some ways unique, the same principles may be applied to other liquids and gases, and this topic is covered in a final section. 

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