Ensure your chosen coating chemistry precisely matches your asset's operating and ambient environmental profiles.
Implement a risk-based inspection (RBI) program to identify critical, insulated areas.
As of 2025, AMPP is continuously reviewing SP0198. Expected changes in future revisions include:
Understanding is crucial for engineers, inspectors, and maintenance planners tasked with maintaining the structural integrity of insulated piping, tanks, and vessels. Corrosion Under Insulation (CUI) remains one of the most insidious and expensive problems in the oil, gas, chemical, and power industries.
A: Yes. RP0198 was the original name (Recommended Practice). SP0198 is the current name (Standard Practice). The content is nearly identical in recent revisions. nace sp0198 pdf
NACE SP0198 emphasizes that coatings are only one part of the solution. The standard also addresses mechanical design and insulation selection to keep water out of the system entirely.
Systems that cycle through ambient and elevated temperatures aggravate moisture condensation, accelerating damage. Key Pillars of the NACE SP0198 Systems Approach
One of the most debated and referenced parts of the standard.
The standard is applied to piping, vessels, and tanks to prevent CUI in high‑temperature and cyclic environments. Ensure your chosen coating chemistry precisely matches your
Designed for extreme temperature swings, from cryogenic levels up to 1200°F (649°C). These coatings cure well and resist thermal shock without cracking. 2. Stainless Steel Systems (Austenitic and Duplex)
Understanding NACE SP0198: The Definitive Standard for Corrosion Under Insulation (CUI)
: Focuses on general and localized thinning [2, 4].
Used effectively up to 300°F (149°C) to form a barrier against chloride-laden moisture. RP0198 was the original name (Recommended Practice)
Ensure all new insulation work specifies coatings that meet SP0198’s requirements. For example, specify "NACE SP0198-compliant epoxy under insulation" in purchase orders.
NACE SP0198-2010 - Control of Corrosion Under Thermal Insulation and Fireproofing Materials - A Systems Approach
Map out all insulated equipment and piping. Categorize them by substrate material and actual operating temperature ranges (including steam-out or cleaning cycles).