Welded Steel Tanks for Oil Storage - My Committees - API

IMPORTANT NOTE:

Reminder for Reviewers: Changes from the third ballot are in green shading.
Changes resulting from the first two ballots are shaded in purple text..
Reviewers are requested to limit their comments to the green shaded text.






Reviewer: Please cast your ballot, trying not to abstain.



PV&T Members:

This is the 4th ballot of 650-524. The paragraphs that have been modified
as a result of comments submitted on the 3rd ballot are in green shading.
Also in green are changes made based on the Special Issues meeting in
Atlanta this year. Most of the comments are in Section 1, Section 3, and
Appendices C and H. The significant comments were discussed with the
commenters and resolutions determined. The task team thanks all who
provided comments and worked with us to find satisfactory resolutions.

PIP Merge Task Team




June 5, 2004.

NOTES TO REVIEWER:

AGENDA ITEM 650-524: Merge PIP Tank Specifications into API-650.

PURPOSE: This is a revision to API-650 that incorporates most of the
technical content of PIP VEST002 and VESTA003, covering atmospheric
tanks. The PIP documents were written to reflect the current
requirements in the PIP member company internal specifications that
modify and amplify the content of API-650. Merging these
specifications will put most tank technical requirements into a
single industry standard, allowing owners to void much of their
internal standards, and diminish the need for supporting project
specifications. The intent is that this draft, when completed, will
be approved and published as the 12th Edition of API-650. The base
document used for this agenda item is the 10th Edition of API-650 and
Addendums 1, 2, and 3, which are shown in black text. Spring 03 and
Fall 03 agenda items (to be edited by API) approved for publication
are included for convenience and are shown in red font.

ACTION: The task team is resubmitting this draft for formal fourth PV&T
Subcommittee Letter Ballot. Remaining work includes: adding bullets
to paragraphs with Purchaser options, updating the list of bulleted
paragraphs in Appendix L, and updating the list of NDE-related
paragraphs. Those items approved at the Spring 2004 PV&T meeting
will be inserted in the next few months.

NOTE: The API-650 file provided to the task team contains some unusual
formatting, which the reviewer is asked to ignore for now. Lists and
tables are particularly affected. Figures and tables in the current
650 have not been issued to the task team, but are part of this
document.

SCHEDULE/CONTACTS: The reviewer is welcome to contact the task team members
with any questions or comments. The team members are: Steve Braune,
Jim Johnston, George Morovich, and Bruce Roberts. Comments are
requested 30 days before the Fall 04 meeting, to allow time for task
team review prior to the PV&T Meeting.

To assist the reviewer, shading has been used to identify all changes,
except some metrication changes. Black unshaded text has not been revised.
The codes are:

______ Indicates notes to reviewers, or notes to API Staff for
information only. Significant technical changes made by the task team
are also in yellow. Some very minor changes are not flagged at all,
particularly in Appendix L.

______ Indicates that new text from PIP has been added, or is cause for
deletion of text in some cases. Relevant API text which was revised
as a consequence is also flagged in blue. Strikeouts indicate
deletions of PIP text not accepted by the task team.

xxxx Indicates changes resulting from PV&T agenda items approved for
publication since Addendum 3 was published. DO NOT COMMENT ON THESE
PARAGRAPHS.

____ Indicates changes made by the task team due to the previous ballot
comments..

WORD's "Comment Note" feature is used to explain some material. Click on
the pale yellow.






[API/PIP Merged Tank Specification]

[Above title is for balloting only; it will be deleted]



Welded Steel Tanks for Oil Storage









API Standard 650

Twelfth Edition, December 2005??



Draft


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 17.2 kPa (2-1/2
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. The
Purchaser is responsible for specifying any jurisdictional requirements
applicable to the design and construction of the tank.

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 re-rated, 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
re-rated, 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.

Suggested revisions are invited and should be submitted to the Downstream
Segment, American Petroleum Institute, 1220 L Street, N.W., Washington,
D.C. 20005.


[Table of Contents is to be updated later by API Staff]

l

1 Scope 1-1

1.1 General 1-1

1.2 Limitations 1-2

1.3 Compliance 1-2

1.4 Referenced Publications 1-3

2 Materials 2-1

2.1 General 2-1

2.2 Plates 2-1

2.3 Sheets 2-5

2.4 Structural Shapes 2-5

2.5 Piping and Forgings 2-9

2.6 Flanges 2-10

2.7 Bolting 2-10

2.8 Welding Electrodes 2-10

3 Design 3-1

3.1 Joints 3-1

3.2 Design Considerations 3-4

3.3 Special Considerations 3-5

3.4 Bottom Plates 3-5

3.5 Annular Bottom Plates 3-5

3.6 Shell Design 3-6

3.7 Shell Openings 3-10

3.8 Shell Attachments and Tank Appurtenances 3-33

3.9 Top and Intermediate Wind Girders 3-34

3.10 Roofs 3-44

3.11 Wind Load on Tanks (Overturning Stability) 3-51

4 Fabrication 4-1

4.1 General 4-1

4.2 Shop Inspection 4-1

5 Erection 5-1

5.1 General 5-1

5.2 Details of Welding 5-1

5.3 Inspection, Testing, and Repairs 5-3

5.4 Repairs to Welds 5-4

5.5 Dimensional Tolerances 5-5

6 Methods of Inspecting Joints 6-1

6.1 Radiographic Method 6-1

6.2 Magnetic Particle Examination 6-3

6.3 Ultrasonic Examination 6-4

6.4 Liquid Penetrant Examination 6-4

6.5 Visual Examination 6-4

7 Welding Procedure and Welder Qualifications 7-1

7.1 Definitions 7-1

7.2 Qualification of Welding Procedures 7-1

7.3 Qualification of Welders 7-2

7.4 Identification of Welded Joints 7-2

8 Marking 8-1

8.1 Nameplates 8-1

8.2 Division of Responsibility 8-2

8.3 Certification 8-2

appendix a Optional Design Basis for Small Tanks A-1

appendix b Recommendations For Design And Construction

Of Foundations For Aboveground Oil Storage

Tanks B-1

appendix c External Floating Roofs C-1

appendix d Technical