Plumbing Corrosion Index Langelier Calculator
Compute named Langelier index from actual pH and independently established matched saturation pH; does not infer saturation chemistry, corrosion rate or universal aggressive/scaling classification.
Description
The Langelier index compares observed pH with matched saturation pH.
The Langelier index compares observed pH with matched saturation pH. The index alone does not determine material corrosion rate.1
The returned values include Caller matched index values. The How section below explains the calculation, input rules and interpretation.
When to use Plumbing Corrosion Index Langelier Calculator
Use Plumbing Corrosion Index Langelier Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No saturation-property calculation, corrosion rate or universal scaling classification is supplied.
Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
How to use Plumbing Corrosion Index Langelier Calculator and understand its results
- Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
- Enter observedPh, callerMatchedSaturationPh using the field table and calculation rules, then run the tool.
- Read callerMatchedIndexValues. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| observedPh | Observed ph | list of number | Required |
| callerMatchedSaturationPh | Caller matched saturation ph | list of number | Required |
Enter aligned nonempty finite observed and saturation pH lists with every value in 0–14. Return signed index values without category labels.
LangelierIndex=observedPh−saturationPh Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| callerMatchedIndexValues | Caller matched index values | list of number |
{
"input": {
"observedPh": [
8,
7
],
"callerMatchedSaturationPh": [
7.5,
7.5
]
},
"output": {
"callerMatchedIndexValues": [
0.5,
-0.5
]
}
}Limitations and assumptions
No saturation-property calculation, corrosion rate or universal scaling classification is supplied.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Plumbing Corrosion Index Ryznar Calculator: The Ryznar index uses measured pH and independently established saturation pH under matched conditions. It is an empirical index rather than a corrosion rate. For a complementary task, use Plumbing Water Hardness As Caco3 Calculator: Hardness expressed as CaCO3 converts ion concentrations using equivalent weights. Consistent equivalent weights distinguish this from summing raw ion masses.
References
Similar or alternative tools
- Plumbing Corrosion Index Ryznar Calculator
The Ryznar index uses measured pH and independently established saturation pH under matched conditions. It is an empirical index rather than a corrosion rate.
- Plumbing Water Hardness As Caco3 Calculator
Hardness expressed as CaCO3 converts ion concentrations using equivalent weights. Consistent equivalent weights distinguish this from summing raw ion masses.