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_i <br />!l <br />~,. <br />.I <br /> <br />~• <br />:. ~ ~ <br />7.4 COLD WEATHER DIFFICULTIES <br />Freezing of solutions in tanks and pipes is the most likely <br />problem resulting from extended periods of very cold <br />weather. This possibility has been taken into account in <br />the design of the plant, and provisions made to prevent <br />freezing, as follows: <br />^ An electric heating element is provided in the Sodium <br />Hydroxide Tank 06-TK-16, and the tank i3 insulated. <br />The temperature of the 50~ sodium hydroxide solution <br />is normally maintained at 75-95°F by a thermostat which <br />controls the immersion heater. Sodiuri hydroxide <br />solution (50$) starts to freeze at 60°F. <br />^ Sodium hydroxide piping, from the metering pumps 06- <br />PP-37 and 38 to the scrubber, is heat-traced and <br />insulated. <br />^ The process water make-up line to the scrubber solution <br />reservoir is heat-traced and insulated. <br />^ The scrubber solution recirculation and bleed lines are <br />heat-traced and insulated. <br />To ensure safe and reliable operation of the Fume Scrubber, <br />it is essential that the heat-tracing, tank heating and <br />insulation be maintained in working order. <br /> <br /> <br /> <br />r 1 pj/1504rp 012591 <br />~~ <br />7-4 <br /> <br />