ISO 12944 is a globally recognised standard that provides guidelines on the protection of assets from corrosion. It covers the protective paint systems designed for application to abrasive blasted steel, hot-dipped galvanized steel, and thermally sprayed zinc steel.
The classification of the environment is given in this table:
Corrosivity Category | Application Area – Outdoors | Application Area – Indoors |
C1 (Very low) | Not Applicable | Inside heated rooms – offices, commercial buildings, schools, hotels |
C2 (Low) | Low pollution, mostly rural areas | Unheated buildings where condensation may occur – storage, facilities, sport centres |
C3 (Medium) | Urban and industrial areas, moderate pollution, coastal regions with low salt concentration | High humidity rooms with some air pollution – breweries, dairies, food production facilities |
C4 (High) | Industrial areas, coastal regions with moderate salt concentration | Chemical plants, swimming pool, boat houses above sea water |
C5 – I (Very high) | Industrial areas with high humidity and aggressive atmospheres | Building and areas with ever present condensation and heavy pollution |
C5 – M (Maritime) | Coastal and offshore regions with high salt concentration | Buildings and areas with ever present condensation and heavy pollution |
The durability categories of corrosion protection are as follow:
Low | Medium | High | Very High |
Up to 7 years | 7-15 years | 15-25 years | More than 25 years |
To find out more information, please contact Exnovo’s team of experts to discuss the best surface protection for your transformer needs.