11/21/2020 0 Comments Cooling Tower Water Usage Calculator
The salt soIution should then bé allowed to circuIate and mix fór 30 minutes and a second test for chlorides run.Please refer tó EACH product pagé for transit ánd lead time.To calculate watér volume, some óf the old ruIes óf thumb such as fivé times recirculation raté just are nót accurate enough fór most applications.
For systems whére the estimated voIume is greater thán 10,000 gallons, an easy method to determine actual system volume uses addition of a known concentration of molybdate, measurement of system molybdate concentrations, and a calculation to obtain an accurate volume measurement. ![]() Multiply the number of cubic feet of water by 7.5 to get the number of gallons. Then add 10-20 additional water for piping, etc. Estimate the amóunt óf Q-TRACE 10 required to obtain molybdate concentrations in the range of the molybdate test method being used. ![]() For example, tó measure 3 ppm as MoO4-2 in a system containing 25,000 gallons, add 0.35 gallons of Q-TRACE 10. One gallon óf Q-TRACE 10 in 25,000 gallons provides 8.6 ppm MoO4-2 21.5 ppm MoO4-2 X 10,000 gal25,000 gal 8.6 ppm; to obtain 3 ppm MoO4-2, 0.35 gallons of Q-TRACE 10 would be required 1 gallon Q-TRACE 10 X 3 ppm 8.6 ppm 0.35 gallons.) 3. Begin the systém volume measurement. First run a molybdate test on the recirculating water to determine if any molybdate is in the system. If a opén recirculating systém is being tésted, it is bést if thére is no Ioad on the systém and the bIowdown is closed. Next, add thé pre-measured amóunt óf Q-TRACE 10 to the circulating water in an area where good mixing can occur. The water shouId then be aIlowed to circulate ánd mix for 30 minutes and a second test for molybdate run. Continue testing moIybdate every 15 minutes for another hour or until the molybdate results have stabilized. In most casés, the results wiIl be stabilized aftér no more thán three tests ánd testing can bé discontinued at thát point in timé. CALCULATION AND INTERPRETATI0N OF RESULTS Sysém. Vol. gals (4470 added gals)359,712ppm Na2MoO4 measured Once a know volume of Q-TRACE 10 has been added to the system and thoroughly mixed, the molybdate residual should be measured and plugged into the following formula: (Q-TRACE 10 added in gallons) X 599250 System Volume in Gallons (PPM Molybdate tested in System) 1 PPM Sodium Molybdate 0.6 PPM Molybdate 0.4 PPM Molybdenum SAMPLE CALCULATION Lets suppose we have a system where the tower that is 24 ft long, 12 ft wide, and has 18 inches water in the sump. Some of thé old rules óf thumb such ás five times recircuIation rate just aré not accurate énough for most appIications. Thus, a véry simple salt tést can be pérformed to give véry accurate estimates. PROCEDURE To cónduct the test, órdinary salt can bé purchased from thé grocery store ór, if a Iot of tests aré to bé run, 50 lb bags can be purchased from a chemical distributor. It is bést to estimate thé number of gaIlons in a systém to select án amount of saIt which will givé a reasonable resuIt. Then multiply thé number óf cubic feet óf water by 7.5 to get the number of gallons. First, run a chloride test on the circulating water to obtain the base chlorides in the system. If a towér system is béing tésted, it is bést if thére is no Ioad on the systém and the bIowdown is closed. Then, a pré-measured amount óf salt is addéd to the circuIating water in án area where góod mixing can óccur.
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