---
title: "Step 6 Estimate RL (AR DMs and CUI)"
slug: "step-6-estimate-remaining-functional-life-ar-dms-and-cui-1"
status: "update"
updated: 2026-10-27T23:12:55Z
published: 2026-10-27T23:12:55Z
canonical: "ims-handbook.cenosco.com/step-6-estimate-remaining-functional-life-ar-dms-and-cui-1"
---

> ## 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 6 Estimate RL (AR DMs and CUI)

## ![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/SRBI%20(4).jpg?sv=2026-02-06&spr=https&st=2026-10-28T11%3A53%3A36Z&se=2026-10-28T12%3A53%3A36Z&sr=c&sp=r&sig=6CMFgdCnm55l%2BOXqeR5ZNTXXTNIqtZyBMZQqS2piBls%3D)

## Aim

For AR DMs: Review the Inherited Circuit’s Corrosion Rates (CR) and Allowable Corrosion Rate (ACR), to select a CR and determine the Remaining Life (RL). If present, also take credit for Lining/Coating.

See [Methodology Step 6](/v414/docs/methodology-step-6) and [Software Step 6](/v414/docs/software-step-6).