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You worked with several fascinating technologies in this chapter, most of them open source with very relaxed licenses. I was able to build this demo without having to write too much of my own code. I m a huge advocate of not reinventing what smarter people have already done better than I could. In this chapter, you worked with Three20, SKPSMTP, and various Cocoa Touch technologies. You had the opportunity to work with Core Data and understand the basic objects that are used frequently with the entire Core Data stack. You also took a look at how you can leverage Core Data in order to make your application usable even when you re entirely dependent on Internet connectivity to do anything useful. Adding even subtle offline caching can dramatically increase the sales of your next iPhone app, and your users will appreciate it.

25.7.3 Simplified Procedure A simpler method of calculation has been suggested by Whalen [25.11]. This method is also based on the seating stress g on the gasket, as shown in Table 25.5, and on the

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hydrostatic end force involved in the application. Basically, Whalen s equations accomplish the same thing as the Code, but they are simplified since they use the full gasket contact width, regardless of the flange width and the surface finish of the sealing faces. This method is based on the total bolt load Fb being sufficient to 1. Seat the gasket material into the flange surface 2. Prevent the hydrostatic end force from unseating the gasket to the point of leakage In the first case, Table 25.5 lists a range of seating-stress values. The ranges shown were found in a search of the literature on gasket seating stresses. Gasket suppliers can be contacted to confirm these values. Table 25.6 depicts various gasket types and comments on them. As a starting point in the design procedure, the mean value of g could be used. Then, depending on the severity of the application and/or the safety factor desired, the upper and lower figures could be utilized. Two equations are associated with this procedure. The first is Fb = gAg where Fb = total bolt load, lb g = gasket seating stress, psi (from Table 25.5) Ag = gasket contact area, in2 (25.7)

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This equation states that the total bolt load must be sufficient to seat the gasket when the hydrostatic end force is not a major factor. The second equation associated with the hydrostatic end force is Fb = KPtAm where (25.8)

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Pt = test pressure or internal pressure if no test pressure is used Am = hydrostatic area on which internal pressure acts (normally based on gasket s middiameter) K = safety factor (from Table 25.7)

The safety factors K from Table 25.7 are based on the joint conditions and operating conditions but not on the gasket type or flange surface finish. They are similar to the m factors in the ASME Code. Equation (25.8) states that the total bolt load must be more than enough to overcome the hydrostatic end force. The middiameter is used in Am since testing has shown that just prior to leakage, the internal pressure acts up to the middiameter of the gasket. After the desired gasket has been selected, the minimum seating stress, as given in Table 25.5, is used to calculate the total bolt load required by Eq. (25.7). Then the bolt load required to ensure that the hydrostatic end force does not unseat the gasket is calculated from Eq. (25.8). The total bolt load Fb calculated by Eq. (25.7) must be greater than the bolt load calculated in Eq. (25.8). If it is not, then the gasket design must be changed, the gasket s area must be reduced, or the total bolt load must be increased. Both the ASME procedure and the simplified procedure are associated with gasketed joints which have rigid, usually cast-iron flanges, have high clamp loads, and generally contain high pressures. A great many gasketed joints have stamped-metal covers and splash or very low fluid pressure. In these cases, the procedures do not

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