Methodology Step 3

Step 3 Start RBI Analysis and Assign DMs to Components:

Below the Step 3 Methodology is described. See also Software Step 3.

The Mechanical design Barriers (M- and D-type Barriers) should have a verification at the Equipment level, i.e., an inspection. To determine when and how to inspect, a risk assessment of the Barriers should first take place, at the Component level. Large Equipment may have multiple Components in different Corrosion Loops. At least one Component, per CL should be assessed and added to an inspection Schedule.

Specific Guidance Summary

There are some specific cases where the S-RBI assessment approach, in IMS PEI, changes, depending on the Equipment/Component type. These are the Special Emphasis Components. In some of these cases, an Analysis Type, rather than a DM is assigned to the Component. Guidance per Special Emphasis (see the table below) gives additional information with regards to these Special Emphasis Components.

Specific guidance summary - Assigning DMs:

DM / Special Emphasis Component	Description
Corrosive Deadleg	Assign the DL Analysis.
Corrosive Injection and Mixing Points	Assign the IP Analysis or MP Analysis, respectively.
Dissimilar Welds	The DM should be related to the Piping System or Equipment to which the Dissimilar Weld belongs to.
Pressure Relief Devices	Demand Scenarios, rather than DMs, are automatically assigned when Component is created. These can be further defined in the RBI Analysis.
Tanks	Both normal DMs (if mapped to T-DMs) and Tank DMs can be assigned.
Thermal Injection Points and Mixing Points	Assign the Thermal Injection Point or Thermal Mixing Point DM. This is the Thermal Fatigue DM at Injection and Mixing Points.
Underground Piping	Assign the Soil Corrosion (AR) DM.