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For each sample project, the service environment (i.e. exposure conditions) and anticipated maintenance painting sequence needs to be defined. The service environments correspond to ISO 12944-2, “Classification of Environments.” The referenced paper (referred to as the Paper) presents a sequence for typical maintenance painting.
This sequence includes the follow steps:
Original PaintingSpot Touch-Up and Repair (1 or 2 cycles)Maintenance Repaint [spot prime and full coat] (1 or 2 cycles)Full Repaint [total coating removal and replacement]
Coating Work” has been published and presented bi-annually at legacy NACE International Conferences since 1998 and has become one of the most referenced documents for conducting comparative lifecycle costing of protective coating systems across various structures and service environments. However, practical application of the data can be challenging.
This paper and presentation provide examples of how to determine the expected service life and maintenance painting sequence and calculate life cycle cost to examine various coating options for industrial painting projects. The service life and cost data are based on the most recent update to the white paper “Expected Service Life and Cost Considerations for Maintenance and New Construction Protective Coating Work,” co-authored by J. L. Helsel and R. Lanterman, which was presented at the AMPP 2022 annual conference.
The sample projects include a new bridge structure and an existing chemical production facility. Various coating systems are selected for evaluation, with the expected service life of candidate systems based on the assumed maintenance painting sequences. The life cycle costs are estimated based on the forecasted service life of the coating systems, the prevailing service environment and design life of the structure/facility. The examples will illustrate how different circumstances affect the life cycle cost tradeoffs.
SSPC-VIS 2 provides a method to evaluate the degree of rusting on painted steel (or iron) surfaces. The reference color photographs and corresponding black and white images, which depict the percentage of rusting given in the written specification, form part of the standard.
This standard quantifies the degree of rusting on painted steel surfaces with a zero to ten scale base on the percentage of visible rust present on the surface. Visible rust includes rust blisters and undercutting of the coating.
The rusting depicted in the photographs is not accompanied by blistering, but the photographs show staning associated with the rust.
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