Specification for Drilling and Well Servicing Structures

API SPECIFICATION 4F

THIRD EDITION, JANUARY 2008 EFFECTIVE DATE: JULY 1, 2008

Specification for Drilling and Well Servicing Structures

Upstream Segment

API SPECIFICATION 4F

THIRD EDITION, JANUARY 2008 EFFECTIVE DATE: JULY 1, 2008

Special Notes

API publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed.

Neither API nor any of API's employees, subcontractors, consultants, committees, or other assignees make any warranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of the information contained herein, or assume any liability or responsibility for any use, or the results of such use, of any information or process disclosed in this publication. Neither API nor any of API's employees, subcontractors, consultants, or other assignees represent that use of this publication would not infringe upon privately owned rights.

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 authorities having jurisdiction with which this publication may conflict.

API publications are published to facilitate the broad availability of proven, sound engineering and operating practices. These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications should be utilized. The formulation and publication of API publications is not intended in any way to inhibit anyone from using any other practices.

Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard. API does not represent, warrant, or guarantee that such products do in fact conform to the applicable API standard.

All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.

Copyright © 2008 American Petroleum Institute

Foreword

Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent.

This document was produced under API standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this publication or comments and questions concerning the procedures under which this publication was developed should be directed in writing to the Director of Standards, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.

Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually and updated quarterly by API, 1220 L Street, N.W., Washington, D.C. 20005.

Suggested revisions are invited and should be submitted to the Standards Department, API, 1220 L Street, NW, Washington, D.C. 20005, standards@api.org.

Contents

Page

1. Scope 1

2. Normative References 1

3. Terms and Definitions 2

4. Product Specification Levels 5

5. Marking and Information 5

   1. Nameplate 5

   2. Derrick and Mast Nameplate Information 5

   3. Substructure Nameplate Information 6

   4. Crown Block Assembly Nameplate Information 7

6. Structural Safety Level 7

7. Design Loading 8

8. Design Specification 9

   1. Allowable Stresses 9

   2. Operating Loads 10

   3. Wind Loads 10

   4. Dynamic Loads 20

   5. Earthquake Loads 20

   6. Erection Loads 20

   7. Transportation Loads 21

   8. Overturning and Sliding 21

   9. Design Verification 22

9. Materials 22

   1. General 22

   2. Written Specifications 22

   3. Mechanical Properties 23

   4. Material Qualification 23

   5. Material Manufacture 23

   6. Bolts 23

   7. Wire Rope 23

10. Welding Requirements 23

    1. General 23

    2. Welding Qualifications 23

    3. Written Documentation 24

    4. Control of Consumables 24

    5. Weld Properties 24

    6. Post-weld Heat Treatment 24

    7. Quality Control Requirements 24

    8. Specific Requirements—Repair Welds 24

11. Quality Control 25

    1. Quality Control Personnel Qualifications 25

    2. Measuring and Test Equipment 25

    3. Non-destructive Examination 25

    4. Dimensional Verification 27

    5. Workmanship and Finishing 27

    6. Purchaser’s Inspection and Rejection 27

    7. Testing 28

    8. Traceability 28

12. Documentation 29

    1. General 29

    2. Documentation to be Kept by the Manufacturer 29

    3. Documentation to be Delivered with Equipment 30

Annex A (normative) Supplementary Requirements 31

Annex B (informative) Commentary 33

Annex C (informative) API Monogram 43

Bibliography 45

Tables

7.1 Design Loadings 8

1. Onshore Structural Safety Level Multiplier 16

2. Offshore Structural Safety Level Multiplier 16

3. Minimum Design Wind Speed, m/s (knots) 17

4. Elevation Factor,  Location: All 17

5. Gust Effect Factor 18

6. Shape Coefficients 19

A.1 Adjustment Factors for Sub-size Impact Specimens 31

Specification for Drilling and Well Servicing Structures

1. Scope

   
   

   This specification states requirements and gives recommendations for suitable steel structures for drilling and well-servicing operations in the petroleum industry, provides a uniform method of rating the structures, and provides two PSLs.

   
   

   This specification is applicable to all new designs of all steel derricks, masts, guyed masts, substructures, and crown blocks.

   
   

   Annex A provides a number of standard Supplementary Requirements (SRs) which apply only if specified by the purchaser.

   
   

2. Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

API RP 2A-WSD, Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design

API Bulletin 2INT-MET, Interim Guidance on Hurricane Conditions in the Gulf of Mexico

API RP 4G, Recommended Practice for Use and Procedures for Inspection, Maintenance, and Repair of Drilling and Well Servicing Structures

API Spec 8A, Specification for Drilling and Production Hoisting Equipment

API RP 9B, Recommended Practice on Application, Care and Use of Wire Rope for Oilfield Service AISC 335-891, Specification for Structural Steel Buildings—Allowable Stress Design and Plastic Design ASCE/SEI 7-052, Minimum Design Loads for Buildings and Other Structures

ASTM A3703, Standard Test Methods and Definitions for Mechanical Testing of Steel Products

ASTM A578/A 578M, Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications

AWS D1.1/D1.1M:20024, Structural Welding Code — Steel

ISO 97125, Non-destructive testing — Qualification and certification of personnel

ISO 10425, Steel wire ropes for the petroleum and natural gas industries — Minimum requirements and terms of acceptance

1 American Institute of Steel Construction, 1 East Wacker Drive, Suite 3100, Chicago, Illinois 60601, www.aisc.org. 2 American Society of Civil Engineers, 1801 Alexander Bell Drive Reston, Virginia 20191, www.asce.org.

3 ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, Pennsylvannia 19428-2959, www.astm.org. 4 American Welding Society, Incorporated, 550 Northwest LeJeune Road, Box 351040, Miami, Florida 33135, www.aws.org.

5 International Organization for Standardization (ISO), 1, rue de Varembé, Case postale 56, CH-1211 Geneva 20, Switzerland. www.iso.org.

1