Distributor head

Figure 20.14. Layout of distributor heads applied in experiments with high-g rotor 20 (a) The Elgin-head...

Upflow saturators use a bed of undissolved sodium fluoride as a bed in which water is forced through upward. Water under pressure is distributed through a spider-type distributor head located at the bottom of the tank. This head contains hundreds of tiny slits in which water is forced under pressure through these slits and flows upward through the sodium fluoride bed at a controlled rate to ensure the desired 18,000 ppm of fluoride solution. An upflow saturator requires water pressure at a minimum of 20 psi to a maximum of 100 psi, and the flow into the saturator is regulated at 2 gpm. Because the introduction of water to the bottom of the saturator constitutes a definite cross-connection, a certified backflow preventer must be installed on the water supply line to the saturator along with anti-siphon valve on the solution feed pump (2). 

Figures 9-1 and 9-2 show the general type of apparatus used. The reaction vessel consists principally of an aluminum-lined steel vessel fitted with aluminum coils for heating and cooling, inlet and outlet openings, and an air distributor. In operation, about 4,500 kg (about 10,000 lb) of 99.0-99.8 per cent acetaldehyde previously cooled to 0-5°C is rst introduced, and then 18-22 kg (about 39.6-48.4 lb) of manganese acetate is added either in the form of a saturated acetic acid solution or as a powder ground to pass a 200-mesh sieve. Air is introduced through the distributor head, and at...

With off and on reflux return passing through a distributor above the packing, it was found that the distributor would go to pieces within the relatively short period of a week or so. This was undoubtedly due to repetitious thermal shocks caused by rapid cooling from an initial temperature of 1400°F. to a liquid potassium reflux temperature of 400 °F. It is estimated that several thousand cycles of these transients resulted in almost complete failure of the Type 316 stainless steel distributor head. 

In general, phenolics have better heat and moisture resistance than ureaformaldehyde moldings. Heat-resistant phenolics are used in handles and knobs of cookware, welding tongs, electric iron parts, and in the automobile industry for fuse box covers, distributor heads, and other applications where good electrical insulation together with good heat resistance is required. 

FISSION GAS PLENUM ACTIVE CORE FLOW DISTRIBUTOR HEAD... 

Figure 2 is an over-all view of the tensile impact testing apparatus. The recording controller, dewar flask, and distributor head assembly were used in making all four types of tests. Figure 3 is a section through the tensile impact specimen cooling chamber. 

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