Water condensed from the air.
. While the full standard is a protected document typically available for purchase via ANSI Webstore
Because NACE SP0198 is a proprietary technical document owned by , it is protected by copyright laws.
: It acknowledges that sheet metal jacketing and weather barriers will eventually fail. Therefore, it treats CUI mitigation as an overlapping system comprising mechanical design, protective coatings, insulation selection, and systematic inspection . nace sp0198 pdf
NACE SP0198-2017 provides an industry-standard, systems-based approach to mitigating corrosion under insulation (CUI) through design, coating, and maintenance recommendations. The standard covers crucial protective coating systems for carbon and stainless steel, emphasizing the need for comprehensive inspection and design strategies to prevent water ingress. Purchase or preview the standard on the AMPP Store .
Recommends moisture-resistant, non-hygroscopic insulation and lists materials (e.g., low‑chloride options) that reduce or increase CUI risk.
To combat this, the global industry turns to a critical standard: (formerly RP0198). For engineers, inspectors, and maintenance planners, finding a legitimate NACE SP0198 PDF is the first step toward building a robust CUI management program. Water condensed from the air
Equipment headers, brackets, and pipe supports should be designed to shed water rather than pool it against the insulation jacket.
CUI is one of the most expensive and dangerous issues in the oil, gas, and chemical industries because it is "out of sight" until a leak occurs [3, 5]. By following , facilities can significantly extend the service life of their piping and equipment while reducing the risk of catastrophic failure [1, 4].
Materials treated to repel water (like certain aerogels or treated perlite) are highly favored. : It acknowledges that sheet metal jacketing and
| Standard | Focus | Relationship to SP0198 | |----------|-------|------------------------| | | Corrosion Under Insulation (management) | Complementary – API 583 provides RBI details; SP0198 gives technical practice. | | ISO 19277 | Petroleum, petrochemical, and natural gas industries – Control of CUI | Similar, but SP0198 is more common in North America. | | ASTM C795 | Thermal insulation for austenitic stainless steel | Referenced by SP0198 for chloride control. | | SSPC-PA 15 | Application of coatings under insulation | Used together with SP0198. |
"Control of Corrosion Under Insulation (CUI) and Corrosion Under Fireproofing (CUF) Materials—A Systems Approach."
Formulated specifically to be chloride-free to prevent inducing Cl-SCC.
The standard categorizes coating systems based on the operating temperature and the material of the substrate: Carbon Steel (CS): Focuses on preventing general and localized pitting. Common Systems:
It divides recommendations into specific thermal brackets, such as: negative 45 raised to the composed with power C 60 raised to the composed with power C (Cryogenic/Low) 60 raised to the composed with power C 150 raised to the composed with power C (The "CUI Danger Zone") 150 raised to the composed with power C 600 raised to the composed with power C (High Temperature) Critical "Best Practices" from the Standard Avoid "Sweating" Zones: