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LSI = pH (measured) − pHs
- The LSI is expressed as the difference between the actual system pH and the saturation pH: LSI = pH (measured) − pHs
www.energypurse.com › langelier-saturation-index-lsi-and-its-importance-in-water-chemistryLangelier Saturation Index (LSI) and its importance in water ...
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What does LSI mean in chemistry?
What does LSI stand for?
What happens if LSI index is less than 0?
How to calculate pool LSI?
[(7.6) + (0.7) + (2.1) + [(90 TA) - (60 CYA ppm x 0.33)] - (12.1) = X LSI (10.4) + [(90 - 20) alk factor] - (12.1) = X LSI (10.4) + [70 alk factor] - (12.1) = X LSI (10.4) + [1.7] - (12.1) = +0.00 LSI. On the Orenda App, we extrapolate within the LSI chart above, to get more accurate values between each factor.
Mar 12, 2024 · The LSI is expressed as the difference between the actual system pH and the saturation pH: LSI = pH (measured) − pHs. For LSI > 0, water is super saturated and tends to precipitate ascale layer of CaCO 3. For LSI = 0, water is saturated (in equilibrium) with CaCO 3. A scale layer ofCaCO 3 is neither precipitated nor dissolved.
The formula to get your LSI index is: pH + Temperature Index + Calcium Index + Alkalinity Index – TDS index. The resulting number you’ll get is your Pool LSI. The number you should aim for is Zero, which means that your water is perfectly balanced, you won’t get any scaling or corrosion problems if your LSI is zero.
- What Is Langelier Saturation Index?
- LSI Calculation Formula
- LSI Calculation Example
Langelier Saturation Index(LSI) was developed by Scientist Langelier in 1936. The LSI is used to determine the need for calcium carbonate precipitation scale control in water sources containing a TDS concentration of less than 10,000 mg/L LSI is most widely used tool to predict tendency of cooling water. In order to calculate LSI five values namely...
Where; TDS = Total Dissolved Solids(ppm) temp = Temperature(dEG C) CaH = Calcium Hardness(ppm as CaCO3) M-Alk = M-Alkalinity(ppm as CaCO3) pHs = Saturation pH pHa = Actual pH
Lets Calculate.. Put cooling water analysis values in above LSI Formula. You get below values for constants A,B,C & D as per below table: Finally, LSI = pHa – PHs LSI = 8.0 – 7.49 = 0.51 The tendency of this water is slightly scale forming.
- 250 ppm as CaCO 3
- 30 dEG C
- 8.0
- 500 mg/L
Jun 11, 2020 · The LSI is basically a way to determine if water is corrosive (negative LSI) or scale-forming (positive LSI). LSI between -0.30 and +0.30 is the widely accepted range, while 0.00 is perfect equilibrium. There are five variables you need to test for calculate the LSI: pH; Water Temperature (ºC) Calcium Hardness (ppm) Total Alkalinity (ppm)
LSI = pH - pH s. Where: pH is the measured water pH. pH s is the pH at saturation in calcite or calcium carbonate and is defined as: pH s = (9.3 + A + B) - (C + D) Where: A = (Log 10 [TDS] - 1) / 10. B = -13.12 x Log 10 ( o C + 273) + 34.55. C = Log 10 [Ca 2+ as CaCO 3] - 0.4. D = Log 10 [alkalinity as CaCO 3]
Dec 5, 2020 · With the LSI Index, the ideal range you want your water to be at is 0.00. This reading means the water is properly balanced. A reading of +0.3 means the pool is oversaturated with calcium, and a -0.3 reading identifies the pool as undersaturated.
