Agitator installation

Solid sulfur is dumped on the grids of the melter and is melted by means of the heat provided through steam coils in the melter. An agitator installed in the melter helps to melt the sulfur at a faster rate. Liquified sulfur is pumped to the pressure leaf filter and the purified sulfur stored in a separate compartment equipped with steam coils. Sulfur pumps are used to feed the liquid sulfur to the sulfur burner at a... 

A particular problem that frequently arises with suspension duties in very large stirred vessels with several side-entry agitators installed below the liquid surface is that on scale-up the volume increases in proportion to the cube of the linear scale-up factor whereas the surface area increases in proportion to its square. If the arrangement of the impellers found to give a certain rotary flow pattern for optimum suspension of the suspended solids at the model scale is retained at the industrial scale, a fundamentally different flow pattern would result that is totally unsuitable for suspension purposes. Particular account must be taken here of the fact that the secondary flow patterns in the large vessel are scale dependent on account of changed ratio of inertial to frictional forces. Other scale-up criteria derived from considerations of a theoretical free jet are required to achieve an optimum suspension of the particles. 

Rotational speed of agitator Installed power (3 x 380 V) Energy consumption per kg of dried material Overall dimensions... 

Volumetric or gravimetric feeders may be used, but volumetric feeders are usually selected only for installations where comparatively low feed rates are required. Dilution does not appear to be important, therefore, control of the amount of water used in the feeding operation is not considered necessary. Inexpensive hydraulic jet agitation may be furnished in the wetting chamber of the feeder as an alternative to mechanical agitation. The jets should be sized for the available water supply pressure to obtain proper mixing. 

No restrietion is plaeed on agitator type, whereas if a eoil is installed it restriets agitator dimensions. 

Meehanieal stirring is reeommended for testing polymerization reaetions or viseous reaetion mixtures. This requires the use of taller eontainment vessels than the original to install the eleetrie motor for the agitator. 

This illustrates individual multizone PLATECOIL as typically installed in agitated vessels The stress pads, hemmed edges and manifolds are omitted for clarity. Installation may be by welding or bolting. 

Figure 10-161. This figure illustrates an individual multizone Platecoil as typically installed in agitated vessels. The stress pads, hemmed edges, and manifolds are omitted for clarity. Installation may be completed by welding or bolting. (Used by permission Cat. 5-63, Sept. 1994. Tranter , Inc.)...

Industrial bioreactors can withstand up to 3 atmospheres positive pressure. Large fermenters are equipped with a lit vertical sight glass for inspecting the contents of the reactor. Side parts for pH, temperature and dissolved oxygen sensors are a minimum requirement. A steam sterilisation sample port is provided. Mechanical agitators are installed on the top or bottom of the tank for adequate mixing. 

Does increased agitator speed improve performance in the pilot plant If so, there is a potential scaleup problem. Installing a variable-speed drive with a somewhat over-sized motor can provide some scaleup insurance, the cost of which is apt to be minor compared with the cost of failure. 

No specific costs could be found for the cutter, Cu-201 an anchor-type agitator, Ag-301 an epoxy-lined tank, D-101 and the waste treatment system, WTS-801. Further, the F O B. costs of the sand filter, WTS-701, and the extruders, EXT-501, had to be calculated from the installed costs. 

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