TECHNICAL STANDARD
ISO 12944-2
Paints and varnishes — Corrosion protection of steel structures by protective paint systems — Part 2: Classification of environments
ISO
Edition 2 / 2017
Current
WHAT DOES THIS STANDARD COVER?
Addresses classification of the principal environments to which steel structures are exposed and the corrosivity associated with those environments.
WHY IS IT RELEVANT?
Environmental classification is an important input when developing or reviewing protective coating specifications and considering the demands placed on a coating system. Do not imply that environment classification alone determines the correct coating system.
KEY INSPECTION CONSIDERATIONS
ISO 12944-2 deals with classification of the principal environments to which steel structures are exposed and the corrosivity associated with those environments. Environmental classification is an important input into the selection and specification of a suitable protective coating system. The standard addresses atmospheric environments as well as categories associated with structures immersed in water or buried in soil. The actual exposure of the structure should be considered rather than selecting a corrosivity category solely from a general description of the geographical location.
WHAT THE STANDARD SHOULD NOT BE USED TO ASSUME
A corrosivity category is not a direct measurement of coating condition and does not by itself specify a complete protective coating system. Structures at the same site can experience different exposure conditions because of shelter, condensation, orientation, local contamination, immersion, splash, temperature or other micro-environmental effects. Environmental classification should therefore not be treated as a substitute for understanding the actual service conditions of the asset. The selected protective coating system must also consider the other applicable project and coating-system requirements.
PRACTICAL INSPECTION APPLICATION
ISO 12944-2 is particularly relevant during coating specification review, maintenance planning and assessment of whether the proposed protective coating system is appropriate for the intended environment. Inspectors and coating consultants should confirm the environmental classification used by the specification and consider whether the actual exposure conditions observed on the structure are consistent with that classification. Where local conditions are significantly more severe than the general environment, this should be identified during technical review.
RELATED TECHNICAL STANDARDS
RELATED TECHNICAL TOPICS
Corrosivity; Environment classification; Protective coating systems
RELATED PIL GUIDANCE
A pre-condition coating survey brings visual inspection, testing, sampling and access planning together to support evidence-based maintenance decisions.
A structured approach to investigating protective coating failure through evidence, testing, sampling and project-record review.
RELATED EXPERTISE
Coating Inspection; Condition Surveys; Technical Consultancy
ABOUT THIS TECHNICAL SUMMARY
Paint Inspection Ltd provides this information to help inspectors, engineers, asset owners and contractors understand the practical relevance of commonly referenced protective coatings standards. This page is PIL technical guidance and does not reproduce or replace the published standard. Users should refer to the current published standard, project specification, coating manufacturer requirements and other applicable contract documents when establishing project requirements or acceptance criteria.
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OFFICIAL STANDARD
PIL technical summaries are intended to explain the inspection relevance of industry standards and do not replace the published document.
STATUS AND SOURCE VERIFICATION
ISO 12944-2:2017 remains the published International Standard. Edition 3 is under development. Do not substitute the developing document.