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API TR 654

1st Edition, May 2019

Complete Document

Aboveground Storage Tank Caulking or Sealing the Bottom Edge Projection to the Foundation

Detail Summary

Active, Most Current

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Product Details:

  • Revision: 1st Edition, May 2019
  • Published Date: May 2019
  • Status: Active, Most Current
  • Document Language: English
  • Published By: American Petroleum Institute (API)
  • Page Count: 23
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

The purpose of this technical report is to provide guidance to owner/operators who have tanks that are set on a foundation system with the goal to protect the asset from deterioration by minimizing corrosion and foundation deterioration and allowing for proper support of the tank shell. The asset includes the tank itself, as well as the foundation system.


This technical report does not require that caulking or sealants be installed at the bottom edge projection and the foundation of aboveground storage tanks. It provides guidance in situations in which caulking or sealants may be advantageous and should be considered.

This technical report applies to situations where an owner/operator is considering caulk or sealant in this area, or if any regulatory agency requires or recommends that an owner/operator installs some type of caulk or sealant. This document will also consider how to inspect existing caulk and sealant, including maintenance procedures, and includes a suggested inspection schedule.


This technical report does not offer guidance on tanks resting entirely on the ground or earth with no rigid foundation or foundation ring wall.