Please note: as a requirement of the API committee that develops this publication, some addendums may not be available as standalone files, they are simply incorporated into the base publication.

The API Downstream Segment has prepared this
standard to cover large, field-assembled storage tanks
of the type described in 1.2 that contain petroleum
intermediates (gases or vapors) and finished products,
as well as other liquid products commonly handled and
stored by the various branches of the industry.

The rules presented in this standard cannot cover all
details of design and construction because of the
variety of tank sizes and shapes that may be
constructed. Where complete rules for a specific
design are not given, the intent is for the
Manufacturer--subject to the approval of the
Purchaser's authorized representative--to provide
design and construction details that are as safe as
those which would otherwise be provided by this
standard.