of the steel surfacing requirements (according to
NACE RPO178) from Section 13205 STEEL TANKS WITH
FIXED ROOFS.
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NOTE: For purposes of this specification, the term
"maintenance coating" refers to maintenance
overcoating as opposed to complete removal of
coatings and recoating. For maintenance coating
designs, or to determine if maintenance overcoating
is appropriate, a coating condition survey (CCS)
should be accomplished. The CCS should be
accomplished by personnel from a business that
routinely performs coating evaluations, and the
individual investigator should be Certified by SSPC
as a Protective Coatings Specialist. The CCS should
be sufficiently detailed to provide all technical
information about the coatings, and structures to be
coated, required to properly design the project. At
a minimum, the CCS should provide a detailed report
of:
1. Existing coating conditions, including condition
of coating film, and the existence of potentially
hazardous substances that may impact coating
management (i.e. lead, cadmium, chromium);
2. Analysis of remaining coating life, suitability
of overcoating, and technical requirements for
overcoating;
3. Technical recommendations for the most cost
effective management of existing coating systems,
including any hazardous materials present in paint
film; and
4. Any other information of interest to the coating
system management that should be identifiable by an
individual trained and experienced in the field of
coating analysis, coating failure analysis, and
coating design.
The scope of the CCS should be tailored to the
specific project, and it should be recognized that
while multiple coating failures or deficiencies may
look similar to the untrained eye, the risks of
generalizing to save evaluation costs are
potentially very high. The cost of large-scale
failure of the overcoating, and complete replacement
of the coating system, is far more than the cost of
a CCS for all but the smallest projects.
The risks of overcoating can usually be avoided by
designing project to remove all existing coatings to
bare metal, then providing appropriate surface
preparation and coating application. However, the
extra costs of the coating removal, especially if
containing hazardous material, along with the cost
SECTION 09971
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