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<br /> <br />SECTION 7.0 <br />FAILIIRE ANALYSIS <br />7.1 EQUIPMENT FAILURE <br />The following paragraphs describe the conshquences of <br />failure of each of the equipment items in the p#I Adjustment <br />System. <br />pH Adjustment Tank Agitator (04-AG-09) <br />Mechanical or electrical failure of the agitato~ will result <br />in a reduction in the level of mixing within he tank. A <br />fault stop of this drive does not cause any of er drive to <br />stop. The slurry in the tank is agitated b the large <br />volume of air provided by blower 04-CP-03 v a the four <br />sparge pipes. Operation of the system can co tinue until <br />it is convenient to shut it down for repair. Failure of the <br />agitator does not present a hazard. <br />Carbon Safety Screen (04-8C-10) <br />Failure of the Carbon Safety Screen necessita <br />of feed to the plant. The pH Adjustment System <br />in sequence in the normal way. The agitator <br />run to maintain suspension of the solids. T1 <br />does not constitute a hazard. However, precaut <br />1 taken to prevent exposure of personnel to i <br />J during repair of the screen. Refer to Sect <br />details. <br />J pH Adjustment Blower (04-CP-03) <br />Failure of the blower stops the flow of air int <br />in the pH Adjustment Tank. The Sulfuric Acid M <br />stops, the pH increases and HCN stripping cease <br />Scrubber continues to run to absorb any x <br />1 evolved. The agitator continues to run <br />J suspension of the solids. The situation does nc <br />a hazard. However, continued operation wil <br />discharge to the tailings impoundment of slurr <br />higher than normal levels of cyanide. <br /> <br />as stoppage <br />s shut down <br />~ntinues to <br />situation <br />ins must be <br />sidual HCN <br />on 8.0 for <br />the slurry <br />:ering Pump <br />The Fume <br />sidual HCN ~ ~ <br />o~ <br />~ maintain h•s ~~ <br />constitute oC ae <br />result in ~;.~`~ <br />containing <br />pj/1504rp 012591 7-1 <br />