Degradation Management using S-RBI - Overview

Degradation Management (including S-RBI) workflow, step by step.

The Degradation Management (including S-RBI) workflow (see PEI Degradation Management - Theory), as illustrated above, should be implemented as follows:

Step 1: Define the Asset (and set up the Hierarchy) in IMS:

• Set up the IMS Hierarchy: Create Corrosion Loop, FLOC, Equipment, Circuits, Components.
• Collect Asset Information, Verify and Store in IMS.

Step 2: Identify the Threats and Barriers (define the Corrosion Loop):

• Define the Corrosion Loop Boundaries.
• Define the Corrosion Loop Process and Potential DMs.
• Define the Operation Control Barriers (Integrity Operating Windows.
• Identify Degradation Mechanisms.
• Identify Barriers.
• Assign Components to the CL.

Do an S-RBI Analysis:

Step 3: Start the RBI Analysis and Assign Degradation Mechanisms to the Component.

Step 4: Determine the most Credible Failure Scenario:

• Review the Operating Conditions.
• Review RBI Specs.
• Review DM Attachments.
• Define the Credible Failure Scenario.

Step 5: Review the Inspection History and credit the Degradation Mechanisms.

Step 6: Estimate Remaining Functional Life (only AR DMs and CUI):

• Specify Selected Corrosion Rate (SCR).
• Specify Remaining Corrosion Allowance (RCA).
• Take Credit for Lining or Coating Life.

Step 7: Determine Susceptibility to Failure (StF):

• Assess per DM per Component, according to the specific DM’s criteria: CR (only AR DMs) & specific guidance per applicable Special Emphasis and DM.

Step 8: Rate the Consequences of Failure for the most Credible Failure Scenario:

• Asset
• People
• Environment
• Community

Step 9: Review Overall Criticality.

Step 10: Assess the Confidence:

• Answer the Questionnaire based on specific AR DM and NAR DM guidelines.

Step 11: Review the results – Next Inspection Date, Inspection Strategy, Required Inspection Effectiveness:

• Review the Results – IF, MII, NID, IS (and RBI Status).
• Do a Sensitivity Analysis.

When the S-RBI Analysis is done, continue with the Degradation Management cycle:

Step 12: Assign S-RBI Results to Inspection/Corrosion Schedules and/or Update proactive monitoring plans:

• Assign S-RBI Results to an Inspection Schedule.
• For Corrosion DMs: Assign S-RBI Results to a Corrosion Schedule.
• Update proactive monitoring plans.

Step 13: Barrier health Verification - Execute, Analyze, and Document:

• Inspect / Monitor according to NID, IS, Inspection Effectiveness.
• Analyze data (e.g., CR calcs, Calc Summary).
• Document (e.g., ECH, CAIR).

Step 14: Maintain the Barriers.

Step 15: Review S-RBI Analysis and IOWs.

Repeat the cycle: When needed, review the S-RBI Analysis (step 3 – step 12a), then start with the next Inspection (step 12b)...

The next sections explain how to Implement Degradation Management, step by step. Per step, first the methodology and then the specific software actions are explained. Also refer to the additional guidance per Special Emphasis Component and per DM.