Document KRK6YNo9QGEgLYnw6jEq23YkN

POWER'S OATA SHEETS Water Conditioning With Sodium Sulphite J? FLOWMATIC Welcomes SUDDEN CHANGES IN LOAD Ideally, to rid feedwater of dissolved oxygen it need only be boiled but, actu ally, It proves safer to use a reagent In addition, to scavenge whatever amounts may remain or be absorbed after bolling. Sodium sulphite proves an efleclive chemieal for this purpose. It works according to the reaotion: _ - Ot + SKaiSOi - aKatSO, An excess of sulphite should be main tained above this theoretical require ment to insure complete chemical com bination with oxygen. Aa concentrations of all impurities in the boiler water ere affected by blow down, H Is necessary to consider the blowdown rote In calculating amount of chemical required. Amount of chem ically pure sodium sulphite needed to maintain the recommended excess is given by: ppm NaOi " 0.01'ppm excess NftfSOi X blowdown rete'ln % The amount needed to unite with oxy gen theoretically is: ppm No0 ppm Ot X equivalent wi sodium tulphilo equivalent wt oxygen. 7.875 ppm Ot The nomogram facilitates the making of these calculations for conditions of low oxygen content. Connect the vsloe of recommended excess and blowdown rate ond produce to the pivot line. Then connect this point with the value of dis solved oxygen. The result gives the chemically pure sodium sulphite dosage in ppm. To convert to lb per 1000 US . gallons divide by 120. By John F Hvam Sarnia, Ontario rom 460,000 down to 320,000 pounds per hour in IS minutes .. . 280,000 up to 400,000 pounds an hour in another IS minutes . . . and level held closely . . . No mailer how rapidly or widely your boiler load changes, you can be sure of a stable water level in the drum U you depend on COPES Flowmatic for boiler feed control. Users also say adjust ments and maintenance are easy for the plant personnel. NORTHERN EQUIPMENT COMPANY 1281 GROVE DRIVE, ERIE, PENNSYLVANIA BRANCH PLANTS In Conodo, Englond, Prance ond Austria Representatives Everywhere Charts above ere from Perform ance Report, Bullelio 467. Write for your copy today. COPES `r&eeuCfuevtfe'U pvt.. Bailor Feed Water Control . . . Excess or Constant Pressure Control, Steam or Water ... Liquid level Control... Bolanced Valvos . . . Desuperheaters . . . Baiter Steam Tem perature Control . - . Hi-Low Woter Alarms * December 1948