Pump noise

The continuous wave technique has a definite advantage over the other techniques a very narrow band of frequencies is needed to transmit the information. The pulse techniques, on the contrary, use a large band of frequencies, and the various noises, pump noises in particular, are more difficult to eliminate. 

Figure 4-250. Surface pressure transducers location for pump noise elimination.

The pump noise frequency is varying around 8 Hz with a peak-to-peak amplitude of 20 psi. Can the signal still be detected Explain. 

The kick alert detects the free gas over the whole annulus length by comparing the pump noise in the standpipe to the pump noise picked up a few feet below the flowline. The phase shift is correlated to the annulus sonic velocity, itself a function of the free gas. 

The second problem was pump noise. A worker may not have the same sensitivities about wearing a pump and collector as would a member of the general public. For the general public, the noise levels of greater than 72 dB generated by a typical pump are intolerable, especially when the pump... 

For the reduction of pump noise in the actual laboratory the vacuum puiu]>s art-placed in a separate pump room. The pumps P are close to the wall between this room and the laboratory, so as to make the vacuum lines as short as possible. The other aide of tliis wall is provided with a framework M and is reserved for vacuum distillation. Automatic pressure controllers and vacuum gauges are placed on or behind the framework where they are accessible and can easily be watched. The pump room can also serve as a small workshop. 

Does it leak or is it wet (touch the seals) Do you see crystals when using buffered mobile phases Is there anything unusual about the pump noise ... 

An electrochemical detector using a static mercury drop electrode has been optimized for combination with high-performance liquid chromatography. Parameters like pump noise, oxygen in mobile phase and sample solution, nozzle, flow rate, working potential in the d.c. - and the d.p.p.- mode, have been examined. The application of the method in routine analysis has been illustrated by the analysis of the anticancer agent mitomycin C in plasma. 

Several authors attributed the height of the noise level to pump noise[15-18,21]. Any pump introduces noise into the detection signal. Only a few general rules can be given to select a pump. A single piston (M45, Waters) and a double-piston pump (M6000, Waters) were examined in this study (Figure 2). 

Giilich, J. F. 2010. Centrifugal Pumps, 2nd ed. BerUn/New York Springer. This handbook starts with an introduction to flnid mechanics, then moves immediately into pump types, characteristics, applications, operation, and performance. Also addressed are pump noise, vibration, and wear. 

Devices added to the front hub, such as centripetal pumps, noise abatement rings if used, and the gearbox, all require their own special designs and fixings. 

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