WATER REQUIREMENTSFOR OPTIMUM RESULTS, THE FEEDWATER SUPPLY SHOULD BE TESTED PRIOR TO INITIAL STARTUP, IF THE MINERAL CONTENT EXCEEDS THE FOLLOWING RECOMMENDED LIMITS, VARIOUS EXTERNAL TREATMENT PROCESSES (WATER SOFTNER, REVERSE OSMOSIS, ETC,) MAY BE USED TO CORRECT THE PROBLEM. NOTE:AN ANALYSIS OF THE ON-SITE BOILER FEEDWATER MUST BE MADE BY A RECOGNIZED AND RELIABLE WATER TREATMENT COMPANY TO ASCERTAIN THE EXISTING CONDITION AND TREATMENT REQUIRED. |
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HARDNESS, ppm 8 - 85 (-0.5 - 5gpg)
P-ALKALINITY, ppm 85-410 (-5-24gpg) T-ALKALINITY, ppm 200-500 (-7-0gpg) pH (STRENGTH OF ALKALINITY) 8.0 - 11.4
SPECIFIC RESISTIVITY -50k.0 -cm(50,000 ohm-centimeter)
BLOW DOWN BOILER ON AT LEAST ONCE A DAY BASIS. IF BOILER WATER OR FEEDWATER ARE OUTSIDE THE ABOVE LIMITS, A MORE FREQUENT BLOWDOWN IS REQUIRED.
WATER QUALITY CAN AFFECT EFFICIENCY OR RESULT IN BOILER DAMAGE IF NEGLECTED. BOILER FEEDWATER CONTAINS IMPURITIES IN SOLUTION AND SUSPENSION. THESE IMPURITIES CONCENTRATE IN THE BOILER SINCE THE STEAM GENERATED IS ESSENTIALLY PURE. THE CONCENTRATION OF THESE IMPURITIES INCREASES AS MORE FEED-WATER IS INTRODUCED INTO THE BOILER AND STEAM IS PRODUCED. IF THE SUSPENDED SOLIDS ARE ALLOWED TO CONCENTRATE BEYOND CERTAIL LIMITS, A "DEPOSIT" OR SCALE WILL FORM ON THE BOILER'S INTERNAL SURFACES. THIS DEPOSIT CAN INTERFERE WITH PROPER BOILER OPERATION AND CAUSE BOILER FAILURE.
THE CONCENTRATION OF THESE IMPURITIES IS GENERALLY CONTROLLED BY FEEDWATER QUALITY AND BY BLOWDOWN. BLOWDOWN REFERS TO REMOVING A PORTION OF THE BOILER WATER WITH HIGH SOLIDS CONCENTRATION AND REPLACING IT WITH MAKEUP WATER OF A LOWER CONCENTRATION.