Basic Pump Types

Liquid Basic Pump Type Type Impellers... 

The specific speed of a centrifugal pump correlates the basic impeller types as shown in Figure 3-47. 

For the most part, plasma-enhanced etching and deposition are performed in four basic reactor types (Figure 7 2, 46). Each reactor has several basic components a vacuum chamber and pumping system to maintain reduced pressures, a power supply to create the discharge, and gas- or vaporhandling capabilities to meter and control the flow of reactants and products. 

Another way to classify fermenters is based on how the fermenter contents are mixed by compressed air,by a mechanical internal moving part, or by external liquid pumping. Representative fermenters in each category are listed in Table 6.2 and the advantages and disadvantages of three basic fermenter types are listed in Table 6.3. 

The importance of a thorough follow-up of pumping tests has been addressed in section 4.6, and we will get here a further look into the needed action. Pumping tests are an intensive intervention in the local water regime, as the intense pumping reduces water pressures locally. As a result, water from adjacent aquifers, or water compartments, may encroach. Thus every pumping test should be accompanied by continuous measurement of temperature and electrical conductivity, and samples should be collected along the test for laboratory analyses. Basically, two types of outcome are experienced ... 

There are basically two types of cross-flow filter. One is without rotating element in which slurry is usually pumped into the filter in the direction parallel to the filter media to produce a cross-flow. Another type of cross-flow filter is equipped with rotating elements, such as rotary filter press with agitators or turbines attached to a rotary shaft as shown in Fig. 22. ... 

The solvent programmer is an apparatus that allows the composition of the mobile phase to be changed, in a defined manner, over a defined period of time, and is normally controlled by the chromatograph computer. There are basically two types of gradient programmer, one that mixes the solvents at high pressure, prior to the column and the other that involves solvent mixing that occurs at low pressures, prior to the solvent pump. 

Basically, two types of pumps exist Constant-pressure pumps and constant-flow pumps. Pressure-constant pumps are often used to pack HPLC columns. 

Pumps are used for many different applications. Understanding which pump type one needs for this application is very important. For the oil and gas industry, some basic features are listed next ... 

Improvements desired for power reactor fuel pump. The basic pump described above has bearings and seals that are oil-lubricated and cooled, and in some of the pumps elastomers have been used as seals be-twemi parts. The pump of this type that was used in the ARE was designed for a relatively low level of radiation and received an integrated dose of less than 5 X 10 r. Under the.se conditions both the lubricants and elastomers used proved to be entirely. satisfactory. 

The largest volume of thermoplastics is probably processed by means of extrusion. The extmder is the main device used to melt and pump thermoplastics through the shaping device called a die. There are basically two types of extruders single and twin screws. The single-screw extruder is shown in Figure 1.1. The single-screw extruder basically consists of a screw (Fig. 1.2) that rotates within a metallic barrel. The... 

Another type of rotational viscometer is the hehcal-screw rheometer (176). This iastmment is basically a screw-type metering pump that does not pump. The measure of force is the pressure difference resulting from the rotational motion. It is possible to use a bank of pressure transducers of different sensitivities to measure viscosity over a wide range. The iastmment can be used for high temperature rheometry and to foUow polymerkation, shear and heat degradation, and other developments. 

---