What is the Ryznar index?

What is the Ryznar index?

The Ryznar index is a tool that is used to predict the likelihood of calcium carbonate scale to form in a given sample of water. It was created by John Ryznar in the 1940s in an attempt to provide the scientific community with a more accurate predictor of calcium carbonate scaling.

What is saturation pH?

The Langelier saturation level approaches the concept of saturation using pH as a main variable. The LSI can be interpreted as the pH change required to bring water to equilibrium. Water with a Langelier saturation index of 1.0 is one pH unit above saturation.

How is LSI calculated?

LSI Formula:

1. LSI = pH – pHs
2. pHs = (9.3 + A + B) – (C + D) where: A = (Log10[TDS] – 1)/10 = 0.15. B = -13.12 x Log10(oC + 273) + 34.55 = 2.09 at 25°C and 1.09 at 82°C. C = Log10[Ca2+ as CaCO3] – 0.4 = 1.78. D = Log10[alkalinity as CaCO3] = 1.53.

What is RSI in water?

The Ryznar stability index (RSI) attempts to correlate an empirical database of scale thickness observed in municipal water systems to the water chemistry. Like the LSI, the RSI has its basis in the concept of saturation level.

What is RSI cooling tower?

Ryznar Stability Index(RSI) was developed by John Ryznar in 1940. It is also called Rznar Index. The reason behind the development of ryznar index is to get more accurate prediction of calcium carbonate scale than Langalier Saturation Index which was developed in 1936.

What is corrosivity measured in?

The potential for water to be corrosive is measured by three different indexes: the Langelier Saturation Index (LSI), the Potential to Promote Galvanic Corrosion (PPGC), and the Larson Ratio (LR).

What is the LSI for water?

Langelier Saturation Index
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 a Langelier?

The Langelier Index is an approximate measure of the saturation degree of calcium carbonate (CaCO3) in water. It is calculated using the Hydrogen Ion (pH) , Alkalinity (CaCO3), Calcium concentration, Total Dissolved Solids, and water temperature of a tap water sample.

How do you calculate RSI in water?

RSI = 2(pHs) – pH Where: pH is the measured water pH. pHs is the pH at saturation in calcite or calcium carbonate.

How is ryznar stability index calculated?

Ryznar Stability Index(RSI)

1. RSI Prediction. RSI <5.5; Heavy scale will form. 5.5< RSI <6.2; Moderate scale will form.
2. RSI Formula. A =( LOG10 * (TDS)-1) / 10. B = (-13.12 * LOG10(temp +273)) + 34.55.
3. Where; TDS = Total Dissolved Solids(ppm)
4. Langelier Saturation Index Calculator (LSI) Cooling Tower Calculations.

What do you need to know about the Ryznar Stability Index?

With the Ryznar Stability Index determine if your water is aggressive or not. Comparison with the Langelier Saturation index. Water Treatment Solutions Home Turnkey plants Containerized plants

What does a Ryznar value of 6 mean?

In Ryznar Index, any value above 6 indicates the water is likely to form calcium carbonate scale while on the other hand any value below 6 water will dissolve calcium carbonate scale and considered the tendency of water is corrosive.

What’s the difference between the Ryznar and LSI?

However the calculation of saturation pH is same as LSI but the difference is in the formula & prediction values. In Ryznar Index, any value above 6 indicates the water is likely to form calcium carbonate scale while on the other hand any value below 6 water will dissolve calcium carbonate scale and considered the tendency of water is corrosive.