Cooling sequence

Because these trips are disabled by a loss nf cooling signal, they should be disregarded in calculating the diesel reliability in a loss of cooling sequence. If liic trip were bypassed the diesel would have failed, and it is counted as a failure. 

In the second group of mixer agglomeration techniques, powders are moistened to a much lesser extent than the wet capillary state. Relatively weak powder clusters are formed. An example is the moistening, equilibration, drying and cooling sequence used to produce instantized food products. 

Some users specify a step cooling test of 21/4Cr-1 Mo. Step cooling simulates about half the increase in the ductile-brittle transition that will occur after a long-term service. A typical step cooling sequence is as... 

Figure 14-60). While the part was cooling, sequence of events that occurs in transfer molding. 

Time is generally easily controllable to quite high levels of accuracy and precision A steam valve allows steam to enter the autoclave until the hold temperature is reached the valve is then closed and the process is controlled by a timer which, at the end of the specified hold period, sends a control signal to activate the exhaust valves and cooling sequences. The hold time is usually specified in terms of whole minutes— well within the accuracy and precision of all but the most inappropriate of timers. 

A computer program was used to calculate the gas phase compositions to be used for an experiment. Typically, a preweighted polycrystalline foil was placed in the reactor, heated in hydrogen to the desired reaction temperature, and the reactant gas mixture passed continuously over it. Inlet and exhaust gas samples were taken and analyzed every twenty minutes to insure that the gas composition remained constant. The mass of the foil was recorded throughout the run from start-up through the cooling sequence. 

An apparatus in which the controlled heating and cooling sequences demanded in the above technique is depicted in Figure 5.9 and described in section 5.3. Determination of the instant at which all the crystals have finally dissolved in a solution is most commonly made by visual observation. In principle, however, the monitoring of any concentration-sensitive physical or physicochemical property (refractive index, conductivity, density, vapour pressure, particle size distribution, etc.) can offer alternative procedures. 

Figure 22.6. Exemplariiy iiiustrated machine settings for the process parameters of the preheating, hot-compaction and cooling sequence for manufacturing of SR-PP composites...

Note 13—With dark colored materials, such as crude oils, it is impractical to observe, in the test jar, the onset of crystallization and network formation in the test specimen. Hence, it is presumed that network formation will begin at the very early stages of the cooling sequence. 

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