Tanks shape

There is no standard aeration-tank shape or size. Aeration tanks can be round, square, or rectangular. Shallow aeration tanks are more difficult to mix than deeper tanks. Yet aeration-tank depths have ranged from 0.6 m (2 ft) to 18 m (60 ft). The oxidation-ditch systems tend to be shallow, while some high-rate diffused-aeration systems have used veiy deep tanks to provide more efficient oxygen transfer. 

Agitated tank reactors Batch agitated reactor This is a batch stirred tank reactor. For liquid-solid systems, the liquid is agitated by a mechanical apparatus (impeller) and the reactor is of tank shape. For gas-solid systems, the gas is agitated and rapidly circulated through a fixed-bed of solids. This reactor is basically an experimental one used for adsorption, ion exchange, and catalysis studies. 

Washing the TNT and preparing it for final purification. Crude, separated TNT, as described above, is transferred to a separator - a heated iron vessel, in which a temperature of 80°C or somewhat higher is maintained for about 3 hr in order to keep the product therein in a molten state. The remaining spent acid flows down to be then drawn off and added to the main portion of the spent acid. The molten TNT is transferred to a tank in which a preliminary washing (deacidification) is effected. For this purpose wooden tanks, shaped like truncated cones, are used. They are of about 20 m3 capacity and are equipped with stirrers (Fig. 78). 

A thorough analysis takes a look at every proposed tank shape, looks at the gas rate range required, calculates the gas phase mass transfer driving force, and then calculates the required KqO to meet that. Reference is made to data on the mixer under the condition specified and to various D/T ratios to obtain the right mixer horsepower level for each gas rate. 

The mean circulation time (assuming the turbulent flow discharge, Q, from an impeller is g = NqA , the tank shape isT= H, its volume is and DIT is constant) is... 

The shape of the tank has relatively little effect on Np. The power consumed in a horizontal cylindrical vessel, whether baffled or unbafBed, or in a baffled vertical tank with a square cross section is the same as in a vertical cylindrical tank. In an unbaffled square tank the power number is about 0.75 times that in a baffled cylindrical vessel. Circulation patterns, of course, are strongly affected by tank shape, even though power consumption is not. 

So far, none of the alternative tank shapes has gained acceptance. For both, natural gas and compressed hydrogen gas, the cylinder with spherical end caps turns out to be the common container geometry, in spite of the packaging restrictions in vehicles. 

Tank shape Cylindrical and parabolic Cylindrical Cylindrical Parabolic Cylindrical and rectangular... 

When die insulated cryogenic container is in space, equilibrium skin temperature, Tj, can be minimized by using a skin material with a low a/e (absorptivity/emissivity) ratio [1], Suit le coating now available can reduce Ti by as much as 170 R depending onflightpath, tank shape, and tank attitude with respect to the sun and/or other heat sources. 

Agriculture and agricultural machines, enclosed type cab for tractors Cable insulation, pipes, tanks, shaped pieces, telecommunication and vehicle construction... 

The fibrous insulation was an asbestos material molded to the tank shape under heat and pressure. In its final form it was composed of exceedingly small interconnected pores, which permitted an easy flow of air through the material. The closed-cell material was a polystyrene foamed plastic with good vapor-barrier characteristics. 

Question by B. Mandell, Aerojet-General Corp. Did you, or are you, planning to conduct tests for different tank shapes, including the effect of time of pressurizing Answer by Author In all of the tests, pressurization was accomplished in a few seconds then the pressure was held for a few minutes before transfer was initiated (as indicated in Table I). No systematic variation of pressurizing or hold time was attempted. 

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