In most cases, the results will be stabilized after no more than three tests and testing can be discontinued at that point in time.ĬALCULATION AND INTERPRETATION OF RESULTS Continue testing molybdate every 15 minutes for another hour or until the molybdate results have stabilized. The water should then be allowed to circulate and mix for 30 minutes and a second test for molybdate run. Next, add the pre-measured amount of Q-TRACE 10 to the circulating water in an area where good mixing can occur. If a open recirculating system is being tested, it is best if there is no load on the system and the blowdown is closed. First run a molybdate test on the recirculating water to determine if any molybdate is in the system. (One gallon of Q-TRACE 10 in 25,000 gallons provides 8.6 ppm MoO4-2. One gallon of Q-TRACE 10 in a 10,000 gallon system will develop a molybdate residual of 21.5 ppm as MoO4-2 (Molybdate) or 14.4 ppm as Mo+6 (Molybdenum).įor example, to measure 3 ppm as MoO4-2 in a system containing 25,000 gallons, add 0.35 gallons of Q-TRACE 10.

Estimate the amount of Q-TRACE 10 required to obtain molybdate concentrations in the range of the molybdate test method being used. Then add 10-20% additional water for piping, etc.Ģ. Multiply the number of cubic feet of water by 7.5 to get the number of gallons. Estimate the system volume by measuring the sump of the tower and the water level in it. For systems where the estimated volume is greater than 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.ġ. To calculate water volume, some of the old “rules of thumb” such as five times recirculation rate just are not accurate enough for most applications. You are here: Home > Cooling Water Training & Literature > Calculate your Water Volumeįor many closed water and recirculating open cooling systems, the system volume is needed to determine the amount of inhibitor or biocide that is needed for accurate chemical treatment.

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