Larson-Skold Index

Definition - What does Larson-Skold Index mean?

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.

Corrosionpedia explains Larson-Skold Index

The Larson-Skold index is the ratio of twice the number of moles per liter (mol/L) of sulfate (SO42-) plus chlorides (Cl-), to the moles per liter of alkalinity that is typically in the form of bicarbonate and/or carbonate. The Larson-Skold index scale presents the following outcomes of corrosion tendency:

LR
Tendency to corrosion
< 0.2
No metal tendency
0.4<LR=>0.2
Light metal tendency
0.5<LR=>0.4
Low metal tendency
1.0<LR=>0.5
Mid metal tendency
=> 1.0
High metal tendency


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