Selected Answers

From Fabio Zanardo of ENI E&P div. on January 21, 2020:
Reference standard can be either SSPC-VIS or ISO 4 ...read more Reference standard can be either SSPC-VIS or ISO 4628-1/8. The simplest way: Important is dividing the surfaces in homogeneous areas and sections ,representative of the whole structure or facility. Then, for each of those, inspect for visible degradation and set a rating for each type of  defects found (% of coating-degraded surface and defects density and size). ISO 4628 is helpful in setting such a rating through pictograms. Having the assessment, you have the possibility to define the type of repair work (local touch up, extended area, whole surface) and prioritize it (short term -by one year, medium -by three yrs, long term – 5 yrs). What the above is not considering includes other types of inspection that can also be performed to determine the root cause of degradation, if needed. These further findings are useful to fix any external cause for coating degradation.

From jack goodwyn of Southwest Technical Services on January 14, 2020:
Take a look at ISO 12944, ASTM D 610, SSPC Vis 2, ...read more Take a look at ISO 12944, ASTM D 610, SSPC Vis 2, etc. ISO 12994 has a schematic program in one of the sections ( the standard has 8 sections) that may be a help in developing a maintenance program.

From Marc-André Vaillant of Dion Peinture industrielle on January 13, 2020:
I hope inspection companies will answer, but I don ...read more I hope inspection companies will answer, but I don't find any proper answer to that. There is no standard about how to do a good inspection on a maintenance project. It is very relative to the inspector himself and the owner of the asset. There is the SSPC-ViS 2 that proposes a visual picture with a scale from 1 to 10 to evaluate the degree of rusting but nothing more that I am aware of. It is also possible that on the engineering structural drawing, they mention the allowable steel thickness loss, taking into account the margin of error of the steel thickness itself. With this information, you could make a steel thickness survey. You can also produce a spreadsheet to assess maintenance costs in different scenarios, which helps to specify the inspection to be done.