Specification for Drilling and Well Servicing Structures

API SPECIFICATION 4F

FOURTH EDITION, JANUARY 2013 EFFECTIVE DATE: AUGUST 1, 2013

ADDENDUM 1, AUGUST 2016

ADDENDUM 2, MAY 2019

ERRATA 1, MAY 2019

Special Notes

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Foreword

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iii

Date of Issue: May 2019

Affected Publication: Specification 4F, Specification for Drilling and Well Servicing Structures, Fourth Edition, January 2013

Errata 1

Section 8.3.3.2, below 2nd paragraph: Replace the equation with the following:

Ksh = 1.112 – 1.64 + 1.14 0.5 ≤ Ksh ≤ 1.0

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. Service Rig Mast Nameplate Information 6

   4. Substructure Nameplate Information 7

   5. Crown Block Assembly Nameplate Information 8

6. Structural Safety Level 8

7. Design Loading 9

8. Design Specification 11

   1. Allowable Stresses 11

   2. Operating Loads 13

   3. Wind Loads 13

   4. Dynamic Loads 23

   5. Earthquake Loads 24

   6. Ice Loads 24

   7. Erection Loads 24

   8. Transportation Loads 24

   9. Overturning and Sliding 24

   10. Design Verification 26

9. Materials 26

   1. General 26

   2. Written Specifications 26

   3. Mechanical Properties 26

   4. Material Qualification 27

   5. Material Manufacture 27

   6. Bolts 27

   7. Wire Rope 27

10. Welding Requirements 27

    1. General 27

    2. Welding Qualifications 27

    3. Written Documentation 27

    4. Control of Consumables 28

    5. Weld Properties 28

    6. Postweld Heat Treatment 28

    7. Quality Control Requirements 28

    8. Specific Requirement—Repair Welds 28

11. Quality Control 29

    1. General 29

    2. Quality Control Personnel Qualifications 29

    3. Measuring and Test Equipment 29

       Page

    4. Nondestructive Examination 29

    5. Dimensional Verification 30

    6. Workmanship and Finishing 31

    7. Purchaser’s Inspection and Rejection 31

    8. Testing 31

    9. Traceability 32

    10. Processes Requiring Validation 32

12. Documentation 33

    1. General 33

    2. Documentation to Be Kept by the Manufacturer 33

    3. Documentation to Be Delivered with Equipment 34

Annex A (normative) Supplementary Requirements 35

Annex B (informative) Commentary 37

Annex C (informative) API Monogram Program—Use of the API Monogram by Licensees 48

Annex D (informative) Purchasing Guidelines 52

Bibliography 57

Tables

1. Design Loadings for Drilling Structures 10

2. Design Loadings for Service Rig Masts 11

3. Onshore Structural Safety Level Multiplier 15

4. Offshore Structural Safety Level Multiplier 15

5. Minimum Design Wind Speed 16

6. Elevation Factor 17

7. Gust Effect Factor 20

8. Shape Coefficients 21

A.1 Adjustment Factors for Subsize Impact Specimens 35

Figures

1. Member Angle of Inclination 19

2. Member Projected Area 20

   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 Product Specification Levels (PSLs).

      
      

      This specification is applicable to all new steel derricks, masts (including masts with guy lines and service rig masts), substructures, and crown block assemblies with a date of manufacture after the effective date of this specification.

      
      

      Annex A provides a number of standard Supplementary Requirements (SRs) that apply only if specified by the purchaser. Annex B is an informative Annex to assist in an understanding/application of this API specification. Annex C is an informative Annex regarding the API Monogram Program and the API Monogram marking requirements. Annex D is an informative Annex providing guidelines to assist the Purchaser with purchasing equipment manufactured to the requirements in this API document.

      
      

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

API Specification 8C, Specification for Drilling and Production Hoisting Equipment (PSL 1 and PSL 2)

API Specification 9A, Specification for Wire Rope

API Recommended Practice 9B, Recommended Practice on Application, Care and Use of Wire Rope for Oilfield Service

AISC 335-89 1, Specification for Structural Steel Buildings—Allowable Stress Design and Plastic Design

ANSI/AISC 360, Specification for Structural Steel Buildings

ASCE/SEI 7-05 2, Minimum Design Loads for Buildings and Other Structures

ASTM A370 3, Standard Test Methods and Definitions for Mechanical Testing of Steel Products

ASTM A578/A578M, Standard Specification for Straight-Beam Ultrasonic Examination of Rolled Steel Plates for Special Applications

AWS D1.1/D1.1M 4, Structural Welding Code — Steel

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, Pennsylvania 19428-2959, www.astm.org.

4 American Welding Society, Incorporated, 550 Northwest LeJeune Road, Box 351040, Miami, Florida 33135, www.aws.org.