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Overview and Application Examples of CUI-Compass

CUI-Compass is the only device and OS independent software tool on the market for the prediction and assessment of corrosion under insulation and fireproofing (CUI and CUF). Designers, engineers, architects, consultants, maintenance and inspection personnel can quickly assess and quantify the CUI and CUF likelihood ratings and risk rankings of their components or systems, anytime, anywhere, on any device running any OS without the need to install or download anything. CUI-Compass also predicts external chloride stress corrosion cracking, or ECSCC, and the temperature and chloride application limits for stainless steels and alloys.

CUI-Compass has 4 modules under the CUI, Spot Analysis, ECSCC, and CUF tabs. The CUI module is for the prediction and assessment of corrosion under insulation for carbon and low alloy steels, austenitic and duplex stainless steels. The Spot Analysis module is for CUI corrosion rate prediction at a particular spot based on site-specific data (temperature, water content in insulation, chloride content on steel surface). The ECSCC module is for the prediction and assessment of external chloride stress corrosion cracking (ECSCC), SCC crack growth rate, maximum pit depth, the temperature limit, and the chloride concentration limit for stainless steels and alloys.  The CUF module is for the prediction and assessment of corrosion under fireproofing. Figures below show the screen shots of CUI-Compass.

Figure 1a CUI-Compass Predicts the CUI Likelihood Rating and CUI Risk Ranking.

Figure 1b Spot Analysis for prediction of CUI corrosion rate at a specific site spot.

Figure 1c Plot options under Spot Analysis for prediction of CUI corrosion rate at a specific site spot.

Prediction and Assessment of Corrosion Under Insulation for Carbon and Low Alloy Steels, Austenitic and Duplex Stainless Steels

CUI-Compass models the effects of the following 7 parameters on the likelihood and risk of corrosion under insulation for carbon and low alloy steels, austenitic and duplex stainless steels:

(1) Temperature

(2) Coating condition and age

(3) Jacketing and insulation condition

(4) Heat tracing

(5) External environment

(6) Insulation type

(7) Line size or nozzle size

Users of CUI-Compass simply select the parameters from the dropdown list. CUI-Compass makes an overall assessment of the contributing factors to corrosion under insulation and computes the CUI likelihood rating and CUI risk ranking in compliance with the latest edition of API RP 583. The CUI likelihood rating and the CUI risk ranking can be used in Risk-Based Inspection (RBI) assessment (API 580, API 581) and Fitness-For-Service Assessments (API 579-1 / ASME FFS-1).

CUI-Compass can also be used for materials evaluation and selection. Figure 1 shows the CUI performance difference between carbon/low alloy steels and austenitic/duplex stainless steels under similar conditions.

Prediction and Assessment of External Chloride Stress Corrosion Cracking (ECSCC)

Under the ECSCC tab, CUI-Compass models the effects of temperature and chloride concentration on the probability of external chloride stress corrosion cracking (ECSCC) and resistance to localized corrosion such as pitting and crevice corrosion. The outputs from CUI-Compass includes the following (Figure 2 and Figure 3):

CUI-Compass, giving you the right directions in CUI-CUF Prediction and Risk Assessment

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