This standard, which is both a new International Standard and a European Standard, has been given positive votes by both the International and European committees and can now proceed to being a full published standard. It is unlikely that this will be the case for all parts until mid 1998 at the earliest.
It should be noted, that because of the approval given by the European committee, this standard will replace existing national standards such as BS5493 and DIN 55928.
The main problem I see at the moment is that it appears unlikely that the US based specifying houses will use the specification, but will continue to use SSPC and NACE guidelines.
ISO 12944 states that it is designed for use by engineers who have some technical knowledge in the area of corrosion protection, as well as knowledge of other relevant specifications.
Many will find the durability ranges to be extremely useful - this is the estimated time to first major maintenance. This needs to be agreed between the interested parties with reference to ISO 4628/1 to ISO 4628/5. It should always be realised that much less effort is required to maintain a coating which has broken down to Ri2 than one which has broken down to Ri3, for example.
The ‘durability’ ranges considered are:-
Low2-5 Years
Medium5-15 Years
High>15 Years
and are assuming the coating has reached a breakdown level of Ri3.
(It is emphasised that the durability range is not a guarantee time. It is purely present to help the owner of the structure estimate sensible maintenance times. The guarantee time is generally shorter than the durability range, and there is no simple relationship between the two.)
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SUMMARY SECTIONS
ISO 12944-2Covers the corrosivity of various environments and how these can be measured. Various anti-corrosive systems can then be
specified for these environments.
IS 19244-3Deals with best practices in structural steel design from a corrosion prevention viewpoint.
ISO 12944-4Covers surface preparation - reference to ISO 8501, IS0 8502, IS0 8503, ISO 8504.
ISO 12944-5Typical paint systems by generic type for a given durability in a given environment.
ISO 12944-6Laboratory testing of paint systems, particularly intended for those where sufficient practical experience is not yet available. Does not
cover power tool cleaned steel specifically.
ISO 12944-7Covers application at works or on site, inspection and follow up.
Also deals with reference areas.
ISO 12944-8Describes how to prepare specifications for corrosion protection and ancillary issues.
