Pump measurement

Positive displacement vacuum pumps. Measurement of performance characteristics. Part 1 - Measurement of volume rate of flow (pumping speed) 12/93... 

A cylindrical vacuum chamber has an internal diameter of 70 cm and a length of 2.5 m. It is made of cleaned stainless steel and evacuated with a combination of diffusion and rotary vacuum pumps. Measurements of the outgassing rate of the chamber material, cleaned according to the same method, give the following data ... 

Agitation impellers act as caseless pumps. Measured pumping capacities for various impellers have been used to develop correlations of the flow number (Nq = Q/ND ), as a function of Nrj and system geometry. Figure 10.8 presents such a correlation for a 4BP and Figure 10.9 presents a pumping correlation for the HE-3. 

Countercurrent Chromatography Procedure. The entire column (pair of coiled multilayer columns connected in series) was filled with the stationary phase. The apparatus was then rotated counterclockwise at 600 rpm in planetary motion while the mobile phase was pumped into the inlet of the column at a flow-rate of 2.2 mL/min (head to tail elution mode). Maximum pressure at the outlet of the pump measured 80 psi. After a 1-hour equilibration period, the sample was loaded into the Rheodyne injector loop and injected. Effluent from the outlet of the column was continuously monitored with a Shimadzu UVD-114 detector at 312 nm and fractions collected with a Gilson FC-lOO fraction collector to obtain approximately 8.8 mL of eluant in each tube (during a 4-min interval). Retention of the stationary phase was estimated to be 930 mL (74%) by measuring the volume of stationary phase eluted from the column before the effluent changed to mobile phase (330 mL) and subtracting this volume from the total column capacity of 1260 mL. 

Temperature Lift Increase in temperature achieved by a heat pump measures the difference between the temperatures inside the evaporator and condenser. 

To establish the regions of the membrane domain transporting HjO outward and K inward, a variety of sites have been mutated in this pump. Measurements have been made of enzyme activity, cation binding (occlusion), and transport in these mutants. In the membrane domain, mutations, especially of carboxylic and hydrophilic anrrino adds in the region of M4, 5, 6, and 8, affect ion binding and transport. It is, therefore, considered that these transmembrane sequences enclose the ion pathway across the membrane. 

Reversal of inhibition of the add pump depends both on protein turnover and on reversal of inhibitor binding. For example, it appears that the duration of action of omeprazole and lansoprazole on acid secretion is shorter than expected from the 54-hour half-life of the protein of the pump. Measurement of the half-life of labeled omeprazole on the pump gives a value of approximately 15 hours, similar to the half-life of the return of ATPase activity after 7 days of inhibition with omeprazole. The half-life of pantoprazole is approximately twice as much, perhaps due to its binding to cysteine 822, a position less accessible to the natural reducing agent, glutathione. 

McAllister, E. W., ed. 2009. Pipeline Rules of Thumb Handbook, 7th ed. Tulsa PennweU Books. The seventh edition of the classic work features 30% new and updated content. Extensive coverage includes construction, pipe design, control valves, corrosion, gas and liquid pipelines, pumps, measurement, instrumentation, leak detection, tanks, maintenance, economics, and rehabilitation and risk evaluation. 

Gear pump Measuring flow rate of molten polymer - 20 ml/revolution... 

Installation of an early warning of vortex at RHR pumps. Measurement of the pressure fluctuation at the discharge of RHR pumps is considered representative of an impeding vortex on pumps. (This provides a diversity for the reactor level measurement). The alarm from this system initiates the application of an appropriate incident emergency operating procedure, and evacuation of the containment. 

Auxiliary (measured) Oil pump (measured) —Valvetrain (measured)... 

Vacuum technology is used in the IR detector business for insulation in dewars and to improve adhesion in the deposition of optical coatings. To achieve these vacuums, a nearly leak-free container is required. In addition, the container must be clean Many materials will vaporize, generating gas that will increase the pressure above usable limits. In this chapter, we survey the required pumping, measuring, leak detection, and cleanliness. 

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