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<br />SECTION 4.0 <br />POTENTIAL HAZARDS <br />Hydrogen cyanide (HCN) is highly toxic. While the a ipment and <br />controls have been designed to ensure safe operation, alfunctions <br />or operator error may create conditions which are potentially <br />hazardous. The purpose of this report is to analyze th equipment, <br />its controls and operation, to identify these potent'al hazards. <br />Recommendations are made for safe operating and maintenance <br />J practices to minimize the possibility of accident and injury. <br />~-While operating normally, the scrubber is designed to emove 99.9 <br />- of the HCN contained in the air stream drawn from the p Adjustment <br />Tank, the Carbon Safety Screen and the Tailings Ho per. This <br />- results in the discharge from the stack containing le s than 1-2 <br />_ ppm HCN, well below the TLV of 10 ppm for a normal 8-h ur workday, <br />and below the odor threshold of 2-5 ppm. <br />Malfunction of equipment or controls, or errors by oper <br />result in higher concentrations of HCN being dischar~ <br />system during operation. Incorrect procedures during <br />could result in exposure to residual HCN gas in enc: <br />such as tanks or hoppers. Any of these conditions cou <br />hazardous conditions. This report analyzes the potent <br />conditions and makes <br />maintenance procedures. <br />pj/1474rp 012591 <br />recommendations for safe o <br />4-1 <br />tors, could <br />'d from the <br />sea spaces <br />d result in <br />al for such <br />rating and <br /> <br />