API 5C3 : 1994

BULLETIN ON FORMULAS AND CALCULATIONS FOR CASING, TUBING, DRILL PIPE AND LINE PIPE PROPERTIES

American Petroleum Institute

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Foreword
1. SCOPE
2. COLLAPSE PRESSURE
2.1 Collapse Pressure Formulas
2.2 Derivation of Collapse Pressure Formulas
2.3 Collapse Testing Procedure
2.4 Application of Collapse Pressure Formulas to
       Line Pipe
3. PIPE BODY YIELD STRENGTH
3.1 Pipe Body Yield Strength
3.2 Application of Pipe Body Yield Strength Formula
       to Line Pipe
4. INTERNAL PRESSURE RESISTANCE
4.1 Internal Yield Presure
4.2 Internal Pressure Leak Resistance at E1 or E7
       Plane
4.3 Application of Internal Pressure Resistance
       Formulas to Line Pipe
5. JOINT STRENGTH
5.1 Round Thread Casing Joint Strength
5.2 Buttress Thread Casing Joint Strength
5.3 Extreme-Line Casing Joint Strength
5.4 Tubing Joint Strength
5.5 Joint Strength of Round Thread Casing With
       Combined Bending and Internal Pressure
5.6 Line Pipe Joint Strength
6. WEIGHTS
6.1 Nominal Weight
6.2 Calculated Plain-End Weight
6.3 Calculated Threaded and Coupled Weight
6.4 Calculated Upset and Threaded Weight for
       Integral Joint Tubing and Extreme-Line Casing
6.5 Calculated Upset Weight
6.6 Weight Gain Due to End Finishing
6.7 Calculated Coupling Weight
6.8 Calculated Weight Removed in Threading
6.9 Calculated Weight of External Upsets
6.10 Calculated Weight of Internal Upsets
6.11 Calculated Weight of External-Internal Upsets
6.12 Calculated Weight of Extreme-Line Upsets
7. ELONGATION
8. FLATTENING TESTS
8.1 Flattening Tests for Casing and Tubing
8.2 Flattening Tests for Line Pipe
9. HYDROSTATIC TEST PRESSURES
9.1 Hydrostatic Test Pressures for Plain-End Pipe,
       Extreme-Line Casing and Integral-Joint Tubing
9.2 Hydrostatic Test Pressure for Threaded and
       Coupled Pipe
10. MAKEUP TORQUE FOR ROUND THREAD CASING AND TUBING
11. GUIDED BEND TESTS FOR SUBMERGED ARC WELDED LINE
     PIPE
12. DETERMINATION OF MINIMUM IMPACT SPECIMEN SIZE FOR
     API COUPLINGS AND PIPE
12.1 Critical Thickness
12.2 Calculated Coupling Blank Thickness
12.3 Calculated Wall Thickness for Transverse
       Specimens
12.4 Calculated Wall Thickness for Longitudinal
       Specimens
12.5 Minimum Specimen Size for API Couplings
12.6 Impact Specimen Size for Pipe
12.7 Larger Size Specimens
12.8 Reference Information
13. METRICATION
13.1 Metric Conversions and Calculations
13.2 Rounding of Metric Units
14. CALCULATION ACCURACY AND ROUNDING
14.1 Accuracy
14.2 Intermediate Rounding
14.3 Rinal Rounding
Figures
1. Grade N-80 Transition Collapse Formula Derivation
2. Ovality Gauge
3. Coupled Pipe
4. Upset Pipe
5. Upset Pipe - Both Ends
6. Pipe Coupling
7. Pipe Coupling with Special Bevel
8. Weight Calculations for Buttress Thread Couplings
9. Round Threads and Line Pipe Threads
10. Buttress Threads
11. Extreme-Line Thread
12. Integral Joint Tubing
13. Extreme-Line Casing
14. External Upset
15. Internal Upset
16. Pin Upset
17. Box Upset
18. Guided Bend Test Jig
Tables
1. Yield Collapse Pressure Formula Range
2. Formula Factors and D/t Range for Plastic Collapse
3. Formula Factors and D/t Range for Transition
     Collapse
4. D/t Range for Elastic Collapse
5. Average Plastic Collapse Pressure Regression
     Formulas
6. Tolerance Limit C to be Subtracted from Average
     Collapse Formulas to Convert to a Minimum Base
7. Flattening Tests - Distance between Plates
8. Factors for Test Pressure Formulas
9. Critical Thickness of Various API Couplings
10. Calculated Coupling Blank Thickness for API
     Couplings
11. Transverse Impact Specimen Size Required for API
     Couplings
12. Longitudinal Impact Specimen Size Required for API
     Couplings
13. Minimum Size Transverse Charpy Impact Test
     Specimens for Various API Couplings
14. Minimum Size Longitudinal Charpy Impact Test
     Specimens for API Couplings for All Pipe less than
     3 and a half inch outside diameter and for
     larger sizes where Transverse Test Specimens one-
     half size or larger are not possible
15. Number of decimals to be shown in metric units