High temperature pump

No physical marker was obvious for the enhanced exchange activity (84). A fairly complex ESR signal that had about the proper stability to match the enhanced activity was suggested for this purpose (102), but has not been correlated with catalytic experiments on the same samples. A broad ESR signal (probably at least partly identical with the previously reported one (102)) was found to be uncorrelated with hydrogen-deuterium exchange activity (106), but the catalyst appears to have been a high-temperature-pumped one in which the activity is unaffected... 

Although one of the important kinds of information (physical markers for defects) is not at hand, the relatively easy annealing of the excess activity and its dependence on the presence of water should be useful clues. Since alumina possesses hydrogen-deuterium exchange activity before irradiation if it is pumped out at a sufficiently high temperature, a plausible first hypothesis is that radiation introduced sites of the same kind as those produced thermally. This suggestion is favored by the fact that the irradiated catalysts seem to approach as a limit the activity of that high-temperature-pumped catalyst which is insensitive to radiation (the one pumped at 520-550°). 

The suction line is commonly supported under the elbow adjacent to the pump nozzle. This may be a hard support (i.e., pipe t>r a struaural steel member), adjustable type, or spring support for high-temperature pumps. If pumps are located in poor soil areas rtf where differential settlement may occur, extending the pump bkxrk foundation may be neces.sary to pidt up the base. support The stre.s.s/support engineer and civil engineer need to be part of this decision. 

When locating pumps, special consideration should be given to high-pressure and high-temperature pumps. 

The additional hardware and high-temperature pumps that are required to handle the elevated temperature fluid, transfer heat, clean impurities, and remove vapor add to the bulk and reduce the reliability of the system. 

Electric Submersible Oil Well Pump Cable. These cables are rated up to 5 kV and are designed for highly corrosive oil wells that besides oil also contain brine and other harsh chemicals as well as gases under high pressure and high temperatures (6). Insulations can be based on polypropylene for low temperature wells or on ethylene—propylene mbber which is compounded with special ingredients in order to resist the environments of high temperature wells (Fig. 4). 

Other alloys have been developed for use in particular corrosive environments at high temperatures. Several of these are age-hardenable alloys which contain additions of aluminum and titanium. Eor example, INCONEL alloys 718 and X-750 [11145-80-5] (UNS N07750) have higher strength and better creep and stress mpture properties than alloy 600 and maintain the same good corrosion and oxidation resistance. AHoy 718 exhibits excellent stress mpture properties up to 705°C as well as good oxidation resistance up to 980°C and is widely used in gas turbines and other aerospace appHcations, and for pumps, nuclear reactor parts, and tooling. 

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. 

Common uses iaclude pump beariags for water, gasoliae, and solvents having low viscosity high temperatures up to 400°C ia coaveyors and furnaces and ia food, dmgs, and other machinery where oil and grease contamination must be avoided. 

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