The aim of this Recommended Practice (RP) API RP 651:2024 is to outline the procedures and methods necessary for effective corrosion management of carbon steel bottoms in aboveground storage tanks through the use of cathodic protection. This document includes guidelines for applying cathodic protection to both existing and newly constructed aboveground storage tanks. However, it does not provide an in-depth discussion of corrosion control techniques that rely on chemical environmental management or protective coatings.

This RP API RP 651:2024 is designed to offer information and guidance specifically tailored to aboveground metallic storage tanks utilized in hydrocarbon applications when employing cathodic protection. While the practices outlined may also be relevant to tanks serving other purposes, the primary focus is on those in hydrocarbon service. The document is intended as a resource for individuals interested in cathodic protection, but it does not include specific designs for cathodic protection systems. Such designs should be created by professionals who possess a comprehensive understanding of cathodic protection methods applicable to aboveground petroleum storage tanks.

This RP does not prescribe specific practices for every possible scenario, as the diverse conditions under which tank bottoms are installed make it impossible to standardize cathodic protection practices universally.