---
title: "Step 4 Start the RBI 581 Analysis"
slug: "starting-rbi-581-assessment"
updated: 2026-10-27T23:11:45Z
published: 2026-10-27T23:11:45Z
canonical: "ims-handbook.cenosco.com/starting-rbi-581-assessment"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://ims-handbook.cenosco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Step 4 Start the RBI 581 Analysis

Below steps explain of to start an RBI 581 Analysis. As an example we look at the Degradation Mechanism EXTERNAL CHLORIDE STRESS CORROSION CRACKING (EXTCLSCC).

## Starting RBI 581 Analysis

To start the RBI 581 assessment:

1. First, [create the Equipment](/v414/docs/creating-new-equipment). See also [Step 1 Define the Asset (and set up the Hierarchy)](/v414/docs/step-1-define-the-asset).
2. Then [create a Corrosion Loop](/v414/docs/creating-a-corrosion-loop) (CL). See also [Step 2 Identify Threats and Barriers (Define the CL)](/v414/docs/step-2-identify-threats-and-barriers-define-the-cl-1).
3. [Add the Degradation Mechanism (DM) in the CL](/v414/docs/defining-the-degradation-mechanisms), e.g. “Chloride SCC External”.

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/pic 1-33D0D8VE.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A10%3A55Z&se=2026-10-28T16%3A10%3A55Z&sr=c&sp=r&sig=jgjPfo8ZWy95NZMbzF167bOL0VH6HwDYaTp1NrmOPpE%3D)

1. Next [create a Component](/docs/creating-new-pei-components) under your new Equipment and [link your Corrosion Loop to that Component](/v414/docs/assigning-components-to-the-cl). See also [Step 1 Define the Asset (and set up the Hierarchy)](/v414/docs/step-1-define-the-asset).
2. Next in either the Equipment Detail Page or Component Details Page click the *RBI 581* button.

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/pic 1-QDZWJVGV.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A10%3A55Z&se=2026-10-28T16%3A10%3A55Z&sr=c&sp=r&sig=jgjPfo8ZWy95NZMbzF167bOL0VH6HwDYaTp1NrmOPpE%3D)

1. You will be directed to the RBI 581 Detail Page for the specific Equipment. Here, you will see the Component, along with the Inspection History and Specs section.

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/pic 1-5271PU19.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A10%3A55Z&se=2026-10-28T16%3A10%3A55Z&sr=c&sp=r&sig=jgjPfo8ZWy95NZMbzF167bOL0VH6HwDYaTp1NrmOPpE%3D)

1. Below in the Degradation Mechanism section click **New D.M**.

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/pic 1-JMEFOCPF.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A10%3A55Z&se=2026-10-28T16%3A10%3A55Z&sr=c&sp=r&sig=jgjPfo8ZWy95NZMbzF167bOL0VH6HwDYaTp1NrmOPpE%3D)

1. Select the DM. For this example we select the “Chloride SCC External” DM (this should have been added to the Corrosion Loop earlier).
2. Click **Save**.

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/pic 1-Y8ZWNA3V.png?sv=2026-02-06&spr=https&st=2026-10-28T15%3A10%3A55Z&se=2026-10-28T16%3A10%3A55Z&sr=c&sp=r&sig=jgjPfo8ZWy95NZMbzF167bOL0VH6HwDYaTp1NrmOPpE%3D)

The RBI 581 calculation tabs will appear.

> [!WARNING]
> Caution
> 
> You will only be able to start the RBI analysis after [specifying which Risk Calculation Method to use](/v414/docs/rbi-581-risk-matrix#specifying-which-risk-matrix-to-use). Before doing this a warning will show here.

Now you can fill in the data for the [Probability of Failure](/v414/docs/rbi-581-probability-of-failure) calculation.