Couplings, centrifugal-pump

The final element of the equipment description is the equipment boundary figure. A boundary figure is included with each data cell to define the components and limits of the equipment associated with that cell. For example, the data cell boundary figure (Data cell 3.3.7.2.1.1) in Figure 3.2 shows that the centrifugal pump, seal system, motor, motor control unit, lube oil system, coupling, and transmission are all components of the equipment in the data cell. The equipment boundary is inherently reflected in the taxonomy number. 

Figure 3-1A. Sealless Magnetic Drive Centrifugal Pump, no seals, no leakage, no coupling. Chemical resistance depends on materials of construction. See Table 3-2. (By permission, LaBour Pump Co.)...

As liquids are essentially incompressible, less energy is stored in a compressed liquid than a gas. However, it is worth considering power recovery from high-pressure liquid streams (> 15 bar) as the equipment required is relatively simple and inexpensive. Centrifugal pumps are used as expanders and are often coupled directly to pumps. The design, operation and cost of energy recovery from high-pressure liquid streams is discussed by Jenett (1968), Chada (1984) and Buse (1985). 

Close-Coupled Integrated Two-Stage Liquefaction (CC-ITSL), 6 843 Close-coupled single-stage horizontal end suction pump, 22 63-64 Close-coupled vertical centrifugal pump designs, 22 64... 

Step 6. Multiply the horsepower per pound of steam value calculated in step 5 by the turbine steam flow, in pounds per hour. This is the total shaft work that appears at the turbine s coupling. This is the amount of horsepower that is available to spin a centrifugal pump. 

Continuous product flows under high-pressure conditions (p > 30 MPa) can only be achieved with hermetic centrifugal pumps. Although the two drive systems that can be used - the permanent magnet coupling and the asynchronous canned motor - have the same mode of operation, they differ in their applications and their safety ranges. 

In principle magnetic drives could be used with high pressure centrifugal pumps, but as the can between the magnet-coupling rotors has to carry the whole pressure differential it needs to be too thick for this technique to be fully effective this solution is not at all promising. 

The pump (3) is directly coupled to a 5.5 kW-AC motor (2), A conventional centrifugal pump, having specifications di=l34.5 mm, d2=210 mm, bi=31 mm, b2=l9 mm, (31=40, 2=34, 2=7 (backward curved), was used in the experiments. Both closed and open impellers, which have the same specifications, were employed in the tests. A Siemens motor driver (1)... 

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