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<br />7.4 COLD WEATHER DIFFICIILTIES <br />Freezing of solutions in tanks and pipes is the'most likely <br />problem resulting from extended periods ofd 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 i~h the Sodium <br />Hydroxide Tank 06-TK-16, and the tank i~ insulated. <br />The temperature of the 50$ sodium hydroxde solution <br />is normally maintained at 75-95°F by a the ostat which <br />controls the immersion heater. Sodiu hydroxide <br />solution (50$) starts to freeze at 60°F. <br />^ Sodium hydroxide piping, from the meteri~g 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 bled lines are <br />heat-traced and insulated. <br />To ensure safe and reliable operation of the Fine Scrubber, <br />it is essential that the heat-tracing, tank eating and <br />insulation be maintained in working order. <br />pj/1504rp 012591 7-4 <br />