Power pumping

If the pump manufacturer uses motors for pump power measurement, these motors ate caUbrated to determine the horsepower from the electric power reading and caUbration curves. Such test motors ate recaUbrated periodically, ensuring the same degree of accuracy as shown by the torque meters. 

Number of effects versus steam, water, and pump power cost. 

Development The following discussion relates specifically to the use of what could be called radial-inflow, centrifugal-pump power-recovery turbines. It does not apply to the type of unit nurtured by the hydroelecti ic industry for the 1 ge-horsepower, large-flow, low- to medium-pressure differential area of hydraulic water turbines of the Felton or Francis runner type. There seems to have been little direct transfer of design concepts between these two fields the major manufacturers in the hydroelectric field have thus far made no effort to sell to the process industries, and the physical arrangement of their units, developed from the requirements of the hydroelectric field, is not suitable to most process-plant applications. 

Interlock pressure or pump power to shutoff pump... 

Discharge versus pump power requirement, i.e. Q versus... 

Small probed regions down to 1-2 pm are possible using microscope lenses. Lasers can supply as much pump power as needed to compensate for weaker signals, but a limit is reached when sample heating or nonlinear optically induced processes become significant. 

The power consumed to operate a wet electrostatic precipitator is much less than that required by most other methods of control. There are four areas in which power is consumed (1) electrostatic power, (2) fan power, (3) insulator heating power, and (4) pump power. The total electrostatic power input required for operation is 0.8 to 1.0 kW/1,000 ft of collection area. A comparable piece of equipment is a venturi scrubber with 50-in.wg pressure drop. The power required for this installation would be 6 to 7 kW/1,000 cfm. This would mean that approximately seven times the power would be needed to achieve the same amount of cleaning with a venturi scrubber as opposed to using a precipitator. 

At 0100, the two idle recirculation pumps were turned on causing a greater than normal circulation flow with the pumps verging on cavitation. The four pumps powered by the grid were on to run the test a second time if it failed the first time and to continue core cooling when the others stop. 

Figure 3-67. Duplex double-acting plunger pump, power driven. (Courtesy Worthington Corp.)...

The total pump power input Ppi is the net power delivered to the pump drive shaft by the prime mover system. This is... 

Basic Pumps, Power Plant Basics, Overseas Bechtel Inc. 

Pump power requirements increase with the cube of the speed, so doubling the speed requires eight times the power. 

Fig. 2.7 (e) Comparison between spray and micro-jet performance for two flow rates 81.56 ml/min [4.63 pl/mm s]. (f) Comparison between spray and micro-jet performance for the same pumping power. Parts (b-f) reprinted from Fabbri et al. (2005) with permission... 

Phase-change cooling systems make do with smaller sizes without necessarily imposing a larger pumping power requirement compared with single-phase systems. 

The design question is given the heat rate Q, the length L, and width W, select a working fluid with mass flow rate m, channel dimension d, channel spacing Sxd (for 5" is a number >1), number of channels n, and material and thickness of the block H. We will be particularly interested in the pumping power P. 

Note that a good design will be one in which the pumping power P is small compared to the heat removal rate Q ... 

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