Specification for Casing and Tubing

API Specification 5CT Eighth Edition, July 1, 2005

ISO 11960:2004, Petroleum and natural gas industries—Steel pipes for use as casing or tubing for wells

EFFECTIVE DATE: JANUARY 1, 2006

Special Notes

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Copyright © 2005 American Petroleum Institute

API Foreword

This standard is under the jurisdiction of the API Standards Subcommittee on Tubular Goods (API C1/SC5). This API standard is identical with the English version of ISO 11960:2004. ISO 11960 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum and natural gas industries, SC 5, Casing, Tubing, and Drilling Pipe.

This standard shall become effective on the date printed on the cover but may be used voluntarily from the date of publication.

The bar notations in the margins identify parts of this standard that have been changed from the previous API edition. While efforts have been made to ensure the accuracy of the notations, the user of this standard is responsible for recognizing any differences between this and the previous edition.

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 API, Standards department, 1220 L Street, NW, Washington, DC 20005, standards@api.org.

API Specification 5CT / ISO 11960

Contents

Page

API Foreword ii

Foreword vi

Introduction vii

1. Scope 1

2. Conformance 2

   1. Normative references 2

   2. Units of measurement 2

3. Normative references 2

4. Terms, definitions, symbols and abbreviated terms 4

   1. Terms and definitions 4

   2. Symbols and abbreviated terms 8

5. Information to be supplied by the purchaser 9

   1. Casing 9

   2. Tubing 11

   3. Coupling stock and accessories 12

6. Process of manufacture 12

   1. General 12

   2. Heat treatment 13

   3. Straightening 13

   4. Traceability 14

   5. Processes requiring validation 15

7. Material requirements 15

   1. Chemical composition 15

   2. Tensile properties 15

   3. Charpy V-notch test — General requirements 16

   4. Charpy V-notch test — Absorbed energy requirements for coupling stock, coupling

      blanks and couplings 17

   5. Charpy V-notch test — Absorbed energy requirements for pipe 18

   6. Charpy V-notch test — Absorbed energy requirements for casing and tubing accessories 20

   7. Maximum hardness 21

   8. Hardness variation — Grades C90, T95 and Q125 21

   9. Process control — Grades C90, T95 and Q125 21

   10. Hardenability — Minimum percentage martensite for quenched and tempered products 21

   11. Grain size — Grades C90 and T95 22

   12. Surface condition — Grades L80 9Cr and L80 13Cr 22

   13. Flattening — Electric-welded pipe 22

   14. Sulfide stress cracking test — Grades C90 and T95 22

8. Dimensions, masses, tolerances, pipe ends and defects 24

   1. Labels and sizes 24

   2. Dimensions and masses 24

   3. Diameter 24

   4. Wall thickness 25

   5. Mass 25

   6. Length 25

   7. Casing jointers 25

   8. Height and trim of electric-weld flash 26

   9. Straightness 26

   10. Drift requirements 27

   11. Tolerances on dimensions and masses 27

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API Specification 5CT / ISO 11960

1. Pipe ends 28

2. Defects 30

3. Coupling make-up and thread protection 30

1. Couplings 31

   1. General requirements 31

   2. Alternative grades or heat treatments 31

   3. Process of manufacture — Groups 1, 2 and 3 32

   4. Process of manufacture — Grade Q125 32

   5. Mechanical properties 32

   6. Dimensions and tolerances 32

   7. Regular couplings 32

   8. Special-clearance couplings — Groups 1, 2 and 3 33

   9. Combination couplings 33

   10. Reducing couplings — Groups 1, 2 and 3 33

   11. Seal-ring couplings 33

   12. Special-bevel tubing couplings — Groups 1, 2 and 3 33

   13. Threading 33

   14. Surface inspection 34

   15. Measurement of imperfections 35

   16. Repair and removal of imperfections and defects 35

   17. Thread surface treatment — Grade Q125 35

   18. Couplings and coupling blank protection — Grades C90, T95 and Q125 35

2. Inspection and testing 35

   1. Test equipment 35

   2. Lot definition for testing of mechanical properties 35

   3. Testing of chemical composition 36

   4. Tensile tests 37

   5. Flattening test 39

   6. Hardness test 40

   7. Impact test 44

   8. Grain size determination — Grades C90 and T95 46

   9. Hardenability — Grades C90 and T95 46

   10. Sulfide stress-cracking test — Grades C90 and T95 46

   11. Metallographic evaluation — EW Grades P110 and Q125 46

   12. Hydrostatic tests 46

   13. Dimensional testing 48

   14. Visual inspection 51

   15. Non-destructive examination (NDE) 51

3. Marking 58

   1. General 58

   2. Stamp marking requirements 59

   3. Stencil marking requirements 60

   4. Colour identification. 60

   5. Thread and end-finish marking — All groups 61

   6. Pipe-threader marking requirements — All groups 61

4. Coating and protection 62

   1. Coatings — All groups 62

   2. Thread protectors 62

5. Documents 63

   1. Electronic media — All groups 63

   2. Certification — Groups 1, 2 and 3 63

   3. Certification requirements — Grade Q125 63

   4. Retention of records 63

6. Minimum facility requirements for various categories of manufacturer 64

   1. Pipe mill 64

   2. Processor 64

   3. Pipe threader 64

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      API Specification 5CT / ISO 11960

   4. Coupling, pup-joint or accessory manufacturer 64

Annex A (normative) Supplementary requirements 66

Annex B (normative) Purchaser inspection 80

Annex C (normative) Tables in SI units 81

Annex D (normative) Figures in SI (USC) units 154

Annex E (normative) Tables in USC units 184

Annex F (informative) Marking instructions for API licensees 258

Annex G (informative) Procedures used to convert from USC units to SI units 263

Annex H (normative) Product Specification Levels 276

Annex I (normative) Requirements for thread protector design validation 283

Annex J (informative) Summary of Product Specification Level (PSL) requirements 287

Bibliography 291

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API Specification 5CT / ISO 11960

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 11960 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 5, Casing, tubing and drill pipe.

This third edition cancels and replaces the second edition (ISO 11960:2001), which has been technically revised. It also incorporates the Technical Corrigendum ISO 11960:2001/Cor.1:2002.

It is the intent of TC 67 that the second and third editions of ISO 11960 both be applicable, at the option of the purchaser (as defined in 4.1.35), for a period of six months from the first day of the calendar quarter immediately following the date of publication of this third edition, after which period the second edition will no longer be applicable.

vi

API Specification 5CT / ISO 11960

Introduction

This International Standard is based on API 5CT (Specification for Casing and Tubing).

Users of this International Standard should be aware that further or differing requirements may be needed for individual applications. This International Standard is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This may be particularly applicable where there is innovative or developing technology. Where an alternative is offered, the vendor should identify any variations from this International Standard and provide details.

This International Standard includes requirements of various nature. These are identified by the use of certain verbal forms:

• SHALL is used to indicate that a provision is MANDATORY;

  
  

• SHOULD is used to indicate that a provision is not mandatory, but RECOMMENDED as good practice;

  
  

• MAY is used to indicate that a provision is OPTIONAL.

  
  

  
  

  vii

  API Specification 5CT / ISO 11960

  
  

  
  

  Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells

  
  

  1. Scope

     
     

     1. This International Standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain-end casing liners and pup joints), coupling stock and accessories and establishes requirements for three Product Specification Levels (PSL-1, PSL-2, PSL-3). The requirements for PSL-1 are the basis of this International Standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all Grades except H-40 and L-80 9Cr, are contained in Annex H.

        
        

        For pipes covered by this International Standard, the sizes, masses and wall thicknesses as well as grades and applicable end-finishes are listed in Tables C.1 to C.3 and Tables E.1 to E.3.

        
        

        By agreement between the purchaser and manufacturer, this International Standard can also be applied to other plain-end pipe sizes and wall thicknesses.

        
        

        This International Standard is applicable to the following connections in accordance with API Spec 5B:

        
        

• short round thread casing (STC);

  
  

• long round thread casing (LC);

  
  

• buttress thread casing (BC);

  
  

• extreme-line casing (XC);

  
  

• non-upset tubing (NU);

  
  

• external upset tubing (EU);

  
  

• integral joint tubing (IJ).

  
  

  For such connections, this International Standard specifies the technical delivery conditions for couplings and thread protection. Supplementary requirements that may optionally be agreed for enhanced leak resistance connections are given in Annex A.11 (SR22).

  
  

  This International Standard can also be applied to tubulars with connections not covered by ISO/API standards.

  
  

  1. The four groups of products to which this International Standard is applicable include the following grades of pipe:

  
  

• Group 1: All casing and tubing in Grades H, J, K and N;

  
  

• Group 2: All casing and tubing in Grades C, L, M and T;

  
  

• Group 3: All casing and tubing in Grade P;

  
  

• Group 4: All casing in Grade Q.

1