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1 ~~ • • <br />1 5.5 FUME SCRUBBER AND BTACR (0~-SR-01) <br />The scrubber consists of a packed tower follow d by a mist <br />eliminator. A pump (04-PP-22) circulates sodi~m hydroxide <br />solution through the scrubber. Make-up NaOH is added in <br />response to changes in pH as measured by a p~obe in the <br />solution recirculation line. Liquid level is m intained in <br />the reservoir by the addition of process wate~ via valve <br />HV437 which operates in response to the signali from level <br />probe LIT440, located in a stilling well. <br />Air is drawn through the scrubber by a fan (041-FA-O1) and <br />exhausted to atmosphere via a 30-ft high stack. <br />5.6 SODIUM HYDROXIDE STORAGE TANK (06-TR-16) <br />A 50$ NaOH solution is metered into the scrubb r from the <br />storage tank, which also supplies NaOH to the st ip circuit, <br />' ~ via a separate pump and line. The 5,000-gal on tank is <br />insulated and equipped with a thermostaticall -controlled <br />electric heater to maintain the solution tempe ature at 75 <br />-95°F and prevent freezing. <br />~ 5.7 SODIUM HYDROXIDE METERING PUMPB <br />(06-PP-37 and 06-PP-38) <br />.I, Two pumps are installed, one of which is a st ndby. The <br />duty pump meters NaOH solution from the storageank to the <br />''' Fume Scrubber in response to the signal from t pH probe. <br />~~ The duty pump is manually selected by opening orclosing the <br />appropriate suction and delivery valves. <br />The duty pump is started when the pH of the re~Circulating <br />`~ scrubber solution falls to 10.5 and stops when~the pH has <br />risen to 11.5. The diaphragm-type. pum~s_can a adjusted <br />locally to regulate the output. During commissioning, the <br />outputs will be set so that the duty pump uns almost <br />q continuously, to minimize cycling. <br />5.8 SIILFURIC ACID BTORAGE TANK (06-TR-15) <br />1 Sulfuric acid (93$) is stored in a 10,000-c}allon tank <br />constructed of high density polyethylene, fiber reinforced <br />I. plastic. <br />rI <br />L <br />pj/1480rp 012591 5-2 <br />