FOREWORD
This standard is based on the accumulated knowledge and experience of purchasers and
manufacturers of welded steel oil storage tanks of various sizes and capacities for internal
pressures not more than 21/2 pounds per square inch gauge. This standard is meant to be a
purchase specification to facilitate the manufacture and procurement of storage tanks for the
petroleum industry.
If the tanks are purchased in accordance with this standard, the purchaser is required to
specify certain basic requirements. The purchaser may want to modify, delete, or amplify
sections of this standard, but reference to this standard shall not be made on the nameplates
of or on the manufacturer�s certification for tanks that do not fulfill the minimum requirements
of this standard or that exceed its limitations. It is strongly recommended that any
modifications, deletions, or amplifications be made by supplementing this standard rather
than by rewriting or incorporating sections of it into another complete standard.
The design rules given in this standard are minimum requirements. More stringent design
rules specified by the purchaser or furnished by the manufacturer are acceptable when mutually
agreed upon by the purchaser and the manufacturer. This standard is not to be interpreted
as approving, recommending, or endorsing any specific design or as limiting the
method of design or construction.
This standard is not intended to cover storage tanks that are to be erected in areas subject
to regulations more stringent than the specifications in this standard. When this standard is
specified for such tanks, it should be followed insofar as it does not conflict with local
requirements.
After revisions to this standard have been issued, they may be applied to tanks that are
to be completed after the date of issue. The tank nameplate shall state the date of the edition
of the standard and any revision to that edition to which the tank has been designed
and constructed.
Each edition, revision, or addenda to this API standard may be used beginning with the
date of issuance shown on the cover page for that edition, revision, or addenda. Each edition,
revision, or addenda to this API standard becomes effective six months after the date of issuance
for equipment that is certified as being rerated, reconstructed, relocated, repaired, modified
(altered), inspected, and tested per this standard. During the six-month time between
the date of issuance of the edition, revision, or addenda and the effective date, the purchaser
and manufacturer shall specify to which edition, revision, or addenda the equipment is to be
rerated, reconstructed, relocated, repaired, modified (altered), inspected, and tested.
API publications may be used by anyone desiring to do so. Every effort has been made by
the Institute to assure the accuracy and reliability of the data contained in them; however, the
Institute makes no representation, warranty, or guarantee in connection with this publication
and hereby expressly disclaims any liability or responsibility for loss or damage resulting
from its use or for the violation of any federal, state, or municipal regulation with which this
publication may conflict.
The purchaser shall specify whether tanks supplied to this standard will have SI dimensions
and comply with applicable ISO standards, or have U.S. Customary dimensions and
comply with applicable U.S. standards. Where conflicts arise between SI and U.S. Customary
units, the U.S. Customary units will govern.
Suggested revisions are invited and should be submitted to the American Petroleum Institute,
1220 L Street, N.W., Washington, D.C. 20005, standards@api.org.
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