By Heinz P. Bloch, Claire Soares EMM Systems Dallas Texas USAPrincipal Engineer (P. E.)
Strategy Plant equipment presents the mechanical, chemical or plant engineer with the data had to pick out gear most suitable for a specific strategy, to figure out optimal potency, and to behavior uncomplicated troubleshooting and upkeep tactics. method Plant equipment is a distinct single-source reference for engineers, managers and technical group of workers who have to gather an figuring out of the equipment utilized in sleek method crops: top movers and tool transmission machines; pumping apparatus; fuel compression equipment; and combining, conveying, and separation apparatus. beginning with an outline of every type, the publication fast leads the reader via functional purposes and measurement concerns into profusely illustrated part descriptions. the place priceless, regular idea is expertly defined in shortcut formulation and graphs. Maintainability and vulnerability issues are handled in addition. absolutely up-to-date with all new gear availableComprehensive CoverageMulti-industry relevance
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Extra resources for Process Plant Machinery, Second Edition
04/KW-Hr E n e r g y Savings O f $ 1 0 . 9 0 Using Design D Vs. Design B / 5 0 00 ~,000 3000 tO00 LO00 ~,ccel I g ' ~ " - - ~ , , ~ - , , ~ - . . me--'Seconds "J -'I ..... FIGURE 1-9 Energy usage on duty cycle application 5-HP, 4-pole, TEFC accelerating 27 lb-fi 2 inertia. ) pump, for example, could be utilized in place of a l O-horsepower pump, thereby reducing motor horsepower requirements by one third. By reducing the mass of the moving parts, the energy required to accelerate the parts is also proportionately reduced.
Beyond the 150 percent full-load torque point, however, the torque-per-amp ratio is Electric Motors and Controls no longer proportional. For this case, 251 percent breakdown torque would require 330 percent current. Adjustable frequency controllers are typically rated for a maximum of 100 percent continous or 150 percent for one minute of the controller full-load current. This would generally provide a maximum of 100 percent or 150 percent of motor full-load torque. This would not, however, provide the same amount of torque as the motor could potentially develop if it were operated from utility power, which could normally provide as much current as the motor required.
Planetary gears with rotating annuli are shown in Figure 2-11. Here, the stationary planet carder with the three planets is fixed to the gear casing, and the internal tooth annulus connected with the low-speed shaft rotates. Input and output shafts rotate in opposite directions. It should be noted that Figures 2-10 and 2-11 show the gearing with helical teeth, whereas Figure 2-9 illustrates spur gears incorporated in the epicyclic package. The reason for frequently using helical gears is perhaps best explained by reviewing their precursor, stepped gears.