F921® Standard for Aboveground Tanks with Integral Secondary Containment (F921)
The F921® Standard for Aboveground Tanks with Integral Secondary Containment (F921) addresses aboveground steel secondary containment (atmospheric-type) vessels with built-in monitoring capability for the purpose of giving advance notice of leakage to avoid environmental contamination.
The primary intent of this standard is to address the petroleum product storage market segment, although storage of other non-corrosive, stable liquid chemicals may be covered.
- General Requirements
- Tightness Testing
The standard is based on the application of sound engineering principles and the combined experience of STI membership, which includes state-of-the-art manufacturing practices. It represents a composite of input from users, manufacturers, regulatory authorities and consultants.
Revised: March 2022