Gear pumps, cost

Dilute polymer solutions containing relatively large amounts of volatiles are devolatilized in ordinary, relatively low-cost, single or multiple stage flash tanks. The flash tank is fed via a preheater that superheats the solution. The vapors of the foamingboiling solution are removed at the top of the tank by a vapor takeoff system, and the concentrated solution is removed at the bottom via a gear pump. 

Cost of gear pumps. 100 psig discharge pressure. Cost includes pump, base p ate antj y belt drive, but no motor. 

Let s check the pumping rate of an HE-3 impeller, for the application of Example 10.3, operating at the same HP and close to the same torque. To be entirely fair to the HE-3 impeller, we must make the comparison at constant HP and torque, because the operating cost of an agitator is directly related to HP and the first cost (the capital cost) is closely related to its torque, which primarily determines the gear reducer cost. 

The direct injection of liquid additives, such as polyisobutylene (PIB), to produce stretched film prevents difficulties in extruding and offers a processor a wider range of materials from which to select. It provides cost reductions due to the use of more economical formulations. This method is suitable for the injection of cross-linking agents, liquid colors, and the like, via the extruder or a gear pump. 

The circuit diagram in Fig. 1 shows the common gear pump metering system. The degree of sophistication governing the driving and monitoring of these devices varies from manufacturer to manufacturer, as does the cost. 

The cost and processing advantages of new technology, which combines a Transfermix extrader with a gear pump, are discussed. In this process, plasticisation is carried out in the Transfermix extmder and pressure build-up is undertaken by the gear pump, allowing throughput to become virtually independent of current standard die tool pressures. 13 refs. 

The equipment is not costly. It involves a small pump (Little Giant at 100), garden hose (30 meters for - 30), a small generator (Honda 6K Watt at - 400) and a small grab (- 400). For less than 1,000 one can be totally operational from a row boat. Additional gear can be added as affordable to follow temperature, salinity, pigments, nutrients and bioluminescence in the water column (Figure 14). 

Figure 8.8 costs include the pumping unit, coupling and gear, mechanical seal, and the base plate. All are FOB fabrication shop costs for 2001. The basis of material is cast iron. Use Table 8.24 for Fm. See Table 8.25 for associated cost factors. 

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