How do you calculate the Langelier Saturation Index?

Value D is obtained from Table 3 by reading the measured value for total alkalinity (in mg/L CaCO3) of the sample. The Langelier Saturation Index is the difference between the actual pH of the solution and pHs calculated above.

What is a Langelier Index?

The Langelier Index is an approximate indicator of the degree of saturation of calcium carbonate in water. It is calculatedOpens in new window (58 KB) using the pH, alkalinity, calcium concentration, total dissolved solids, and water temperature of a water sample collected at the tap.

How do you calculate aggressive index?

The formulae used in the aggressive Index is stated as AI = pH + log (A * H). In this statement, “AI” represents the aggressive Index. “A” is the alkalinity of the water. “H” is the hardness of the water.

What is Langelier Index & Ryznar Stability Index?

The Ryznar index is based loosely off of the Langelier saturation index that was created in the 1930s. The Ryznar index is logarithmic, similar to other indices that are used to calculate calcium carbonate formation. The “neutral” zone of the Ryznar index is roughly around the numerical value 6.

What is the Langelier Saturation Index LSI?

The Langelier Saturation Index (LSI) is a cornerstone of the Orenda program. The LSI is the unbiased measurement of water balance, as defined by calcium carbonate saturation. It determines if our water is aggressive/corrosive (low LSI), balanced, or scale-forming (high LSI).

What is the unit of alkalinity?

The unit of measurement for alkalinity is mg/L CaC03. What is the significance of alkalinity? Alkalinity is the measure of the resistance of water to the lowering of pH when acids are added to the water.

What is Larson Skold index?

The Larson-Skold index refers to an empirical scale used to measure the degree of corrosiveness of water relative to mild steel metal surfaces. It is generated based on the in-situ corrosion of mild steel pipelines used to transport naturally occurring water from lakes and other freshwater sources.

How do you calculate the Langelier Index?

The Langelier Index (LI) is calculated as follows: LI =pH −pHs where pH = measured pH of the tap water pHs= calculated saturation pH of the tap water pHs pK pCa pKs log(2[Alk]) logγm 2 = 2′ + − ′− − + In order to calculate pHs, pK2′, and must first be computed. Explanations of how to do these

What is Langelier Saturation Index?

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.

How do you calculate the LSI value of cooling water?

LSI is most widely used tool to predict tendency of cooling water. In order to calculate LSI five values namely TDS(Total Dissolved Solid), Temperature, Calcium Hardness, M-Alkalinity & pH are very important. Based on these five values you can calculate saturation pH called pHs & then subtract it from actual pH to get LSI.

Which is an example of an LSI calculation?

LSI Calculation Example: pH 8.0 Total Dissolved Solids 500 mg/L Temperature 30 dEG C Calcium Hardness 250 ppm as CaCO3 M-Alkalinity 100 ppm as CaCO3