Offshore Pedestal-mounted Cranes

API SPECIFICATION 2C SEVENTH EDITION, MARCH 2012 ERRATA, MARCH 2013

EFFECTIVE DATE: OCTOBER 2012

Offshore Pedestal-mounted Cranes

Upstream Segment

API SPECIFICATION 2C SEVENTH EDITION, MARCH 2012 ERRATA, MARCH 2013

EFFECTIVE DATE: OCTOBER 2012

Special Notes

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Copyright © 2012 American Petroleum Institute

Foreword

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Shall: As used in a standard, “shall” denotes a minimum requirement in order to conform to the specification.

Should: As used in a standard, “should” denotes a recommendation or that which is advised but not required in order to conform to the specification.

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, NW, Washington, DC 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.

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

iii

1. Scope 1

2. Normative References 1

3. Terms, Definitions and Abbreviations 4

   1. Terms and Definitions 4

   2. Abbreviations 17

   3. Units 18

4. Documentation 21

   1. Manufacturer-supplied Documentation upon Purchase 21

   2. Purchaser-supplied Information prior to Purchase 22

   3. Record Retention 22

5. Loads 22

   1. Safe Working Limits 22

   2. Critical Components 23

   3. Forces and Loadings 23

   4. In-service Loads 23

   5. Out-of-service Loads 32

   6. Wind, Ice, and Seismic Loads 33

6. Structure 34

   1. General 34

   2. Pedestal, Kingpost, and Crane Supporting Foundation 35

   3. Exceptions to use of AISC 35

   4. Structural Fatigue 35

7. Mechanical 36

   1. Machinery and Wire Rope Duty Cycles 36

   2. Critical Rigging Components 39

   3. Boom Hoist, Load Hoist, Telescoping, and Folding Boom Mechanisms 46

   4. Swing Mechanism 52

   5. Power Plant 56

8. Ratings 57

   1. General 57

   2. Load Rating and Information Charts 59

9. Gross Overload Conditions 61

   1. General 61

   2. Failure Mode Calculations 62

   3. Calculation Methods 62

   4. Failure Mode Charts 62

   5. Gross Overload Protection System (GOPS). 62

10. Human Factors–Health, Safety, and Environment 63

    1. Controls 63

    2. Cabs and Enclosures 65

    3. Miscellaneous Requirements and Equipment 68

11. Manufacturing Requirements 72

    1. Material Requirements of Critical Components 72

    2. Welding of Critically Stressed Components 76

       v

       
       

    3. Nondestructive Examination of Critical Components 77

12. Design Validation by Testing 77

    1. Design Validation 77

    2. Certification 79

    3. Operational Tests 79

13. Marking 80

Annex A (informative) Example List of Critical Components 81

Annex B (informative) Commentary 83

Annex C (informative) API Monogram Program 100

Annex D (normative) Cylinder Calculation Methods 104

Annex E (informative) Example Calculations 107

Annex F (informative) Additional Purchaser Supplied Information 122

Bibliography 124

Figures

1. Crane Illustrations 2

2. Offboard Loadings 25

3. Onboard Loadings 26

4. Out-of-service Loadings 27

5. Some Methods of Securing Dead End of Rope when using Conventional Wedge Sockets 42

6. Sheave Dimensions 43

7. Hoist Drum 48

8. Plots of Rated Loads for Various Operating Conditions 61

9. Basic Four-lever Crane Control Diagram 65

10. Basic Two-Lever Crane Control Diagram (Option 1) 66

11. Basic Two-Lever Crane Control Diagram (Option 2) 67

B.1 Variable Pedestal Factor 88

C.1 API Monogram Nameplate 103

D.1 Cylinder Configuration 106

E.1 Swing Bearing Ultimate Strengths 120

Tables

1. Description of Symbols 18

2. Summary of Design Parameter 24

3. Vertical Velocity for Dynamic Coefficient Calculations 27

4. Crane Vertical Acceleration 28

5. Crane Base Inclinations and Accelerations 28

6. Recommended Shape Coefficients 33

7. Classification of Offshore Crane Applications 37

8. Auxiliary Hoist – 5 Year TBO 37

9. Main Hoist – 5 Year TBO 37

10. Boom Hoist – 5 Year TBO 37

11. Slew Mechanism – 5 Year TBO 38

12. Prime Mover and Pump Drive – 5 Year TBO 38

    
    

13. Wire Rope TBR by Typical Offshore Crane Classification 38

14. Auxiliary Wire Rope 38

15. Main Wire Rope 39

16. Boom Wire Rope 39

17. Sheave Groove Radius, Metallic Rim 44

18. Sheave Groove Radius, Cast Nylon Rim 45

19. Four-lever Crane Control Function 65

20. Two-Lever Crane Control Function (Option 1) 66

21. Two-Lever Crane Control Function (Option 2) 67

22. Indicators, Alarms, and Limits 69

23. Boom and Load Indicators 70

24. Level 1 Fracture Toughness 73

25. Casting Acceptance Criteria Based on ASTM Radiographic Standards 74

26. Level 2 Fracture Toughness 74

27. Bearing Ring Steel Cleanliness Limits 75

28. Workmanship Standard Examples 78

1. General Method–Vessel Information 84

2. General Method Sample Design Value Calculations TLP and Spar 85

3. Minimum Required Hook Speeds at Supply Boat Deck vs. Significant Wave Height 86

4. Crane Structures 89

5. Auxiliary Hoist – Five Year TBO 90

6. Main Hoist – Five Year TBO 90

7. Boom Hoist – Five Year TBO 90

8. Slew Mechanism – Five Year TBO 90

9. Prime Mover and Pump Drive – Five Year TBO 91

10. Main Hoist Wire Rope 91

11. Auxiliary Hoist Wire Rope. 91

12. Boom Hoist – Wire Rope 92

13. Calculated Noise Exposures 94

Offshore Pedestal-mounted Cranes

1. Scope

   
   

   This specification provides requirements for design, construction, and testing of new offshore pedestal-mounted cranes. For the purposes of this specification, offshore cranes are defined as pedestal-mounted elevating and rotating lift devices for transfer of materials or personnel to or from marine vessels, barges and structures.

   Typical applications can include:

   
   

   1. offshore oil exploration and production applications; these cranes are typically mounted on a fixed (bottom- supported) structure, floating platform structure, or ship-hulled vessel used in drilling and production operations;

      
      

   2. shipboard applications; these cranes are mounted on surface-type vessels and are used to move cargo, containers, and other materials while the crane is within a harbor or sheltered area; and

      
      

   3. heavy-lift applications; cranes for heavy-lift applications are mounted on barges, self-elevating vessels or other vessels, and are used in construction and salvage operations within a harbor or sheltered area or in limited (mild) environmental conditions.

   
   

   Figure 1 illustrates some (but not all) of the types of cranes covered under this specification. While there are many configurations of pedestal-mounted cranes covered in the scope of this specification, it is not intended to be used for the design, fabrication, and testing of davits or emergency escape devices. Additionally, this specification does not cover the use of cranes for subsea lifting and lowering operations or constant-tension systems.

   
   

2. Normative References

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

API Recommended Practice 2A-WSD, Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design, 21st Edition

API Recommended Practice 2D, Recommended Practice for Operation and Maintenance of Offshore Cranes

API Specification 2H, Specification for Carbon Manganese Steel Plate for Offshore Platform Tubular Joints

API Recommended Practice 2X, Recommended Practice for Ultrasonic Examination of Offshore Structural Fabrication and Guidelines for Qualifications of Technicians

API Specification 9A, Specification for Wire Rope

API Recommended Practice 14F, Recommended Design and Installation for Unclassified and Class I, Division 1 and Division 2 Locations

API Recommended Practice 500, Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2

API Recommended Practice 505, Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1 and Zone 2

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