---
title: "PEI Components - Overview"
slug: "pei-components-overview"
updated: 2026-10-27T23:11:52Z
published: 2026-10-27T23:11:52Z
canonical: "ims-handbook.cenosco.com/pei-components-overview"
---

> ## 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.

# PEI Components - Overview

**This online manual explains the Components in IMS:**

- How to interpret and use the Components Main screen (list).
- How to create new Components.
- How to interpret and use the Components details screen.

This will enable you to:

- Understand when a General Component is created.
- Add specs for a Component.
- Add Components to the scope of a Schedule.
- Start an RBI Analysis for a Component-Degradation Mechanism (DM).
- Link the Component to a Circuit(s).

  

In [PEI Hierarchy - Overview](/v414/docs/pei-hierarchy-overview) you can see a visual depiction of the Hierarchy. Have a look to see where Components fit in!

Components are the separate parts of an Equipment that have the [Barriers](/v414/docs/barrier-types) against the Threats of the [Degradation Mechanisms (DMs)](/v414/docs/degradation-classification-theory). Thus, they need verification through inspection. The [RBI risk analysis](/v414/docs/risk-based-inspection-rbi-theory) therefore takes place on this level (per DM). This helps to determine the Next Inspection Date (NID). Examples of Components would include the top of a column, the water boot of a separator, the Shell of an Exchanger, and the Tubes of an air cooler.

A Component must be linked to a Corrosion Loop (CL) before applicable DMs can be assigned to the Component. CLs are groups of Components where Degradation is Managed in the same way.

A Circuit and Component can be set to be inherit. RBI then uses the Circuit’s CR calculations (RCA and SCR) to estimate the Remnant Life (RL). A Circuit covers all Piping- or Equipment-Components where the same Corrosion Rate is Expected/Measured. This is the level on which Wall Thickness (WT) measurements are inputted and CR calculations take place.

For more information on the link with CLs and Circuits see [Relationship between CLs, Components and Circuits.](/v414/docs/relationship-between-cls-components-and-circuits)