API Equation 1
Yield Strength Collapse Pressure

API Equation 2
Intersection between Plastic and Yield Pressure Collapse

API Equation 3
Plastic Collapse Pressure

API Equation 4
Intersection between Plastic and Transition Collapse

API Equation 5
Transition Collapse Pressure

API Equation 6
Intersection Transition/Elastic Collapse

API Equation 7
Elastic Collapse Pressure

API Equation 8
Collapse Pressure under Axial Tension Stress

API Equation 9
Effect of Internal Pressure on Collapse

API Equation 10
Average Plastic Collapse Regression- K-55

API Equation 11
Average Plastic Collapse Regression- N-80

API Equation 12
Average Plastic Collapse Regression- P-110

API Equation 13
Tolerance Limit for Average Plastic Collapse Regression

API Equation 14
Tolerance Interval for Average Plastic Collapse Regression

API Equation 15
Tolerance Interval-Average Plastic Collapse(P=.95,θ=.005)

API Equation 16
Correction Factor for Variation in t/D from Average

API Equation 17
Minimum Plastic Collapse Pressure- K-55

API Equation 18
Minimum Plastic Collapse Pressure- N-80

API Equation 19
Minimum Plastic Collapse Pressure- P-110

API Equation 21
Factor A

API Equation 22
Factor B

API Equation 23
Factor C

API Equation 24
Minimum Transition Collapse Pressure

API Equation 25
Elastic Collapse Pressure

API Equation 26
Factor F

API Equation 27
Factor G

API Equation 28
Theoretical Elastic Collapse Pressure

API Equation 29
Elastic Collapse Pressure

API Equation 30
Pipe Body Yield Strength

API Equation 31
Internal Yield Pressure

API Equation 32
Internal Yield Pressure for Couplings

API Equation 33
Diameter for Formula 32 - Round Thread Casing and Tubing

API Equation 34
Diameter for Formula 32 - Buttress Thread Casing

API Equation 35
Internal Pressure Leak Resistance

API Equation 36
Interface pressure between pin and box as result of makeup

API Equation 37
Change in interface pressure due to internal pressure - after makeup

API Equation 38
Derivation of Formula 35

API Equation 39
Round Thread Casing Joint - Fracture Strength

API Equation 40
Round Thread Casing Joint - Pullout Strength

API Equation 41
Round Thread Coupling Fracture Strength

API Equation 42
Buttress Thread Casing - Pipe Thread Strength

API Equation 43
Buttress Thread Casing - Coupling Thread Strength

API Equation 45
Non-upset Tubing Joint Strength

API Equation 46
Upset Tubing Joint Strength

API Equation 47
Full Fracture Joint Strength - Round Thread Casing

API Equation 48
Jumpout and Reduced Fracture Strength - Round Thread Casing

API Equation 49
Bending Load Failure Strength - P_b/A_jp>=Y_P - Round Thread Casing

API Equation 50
Bending Load Failure Strength - P_b/A_jp<Y_P - Round Thread Casing

API Equation 51
Total Load on Joint - Round Thread Casing

API Equation 52
Sealing Head Load - Round Thread Casing

API Equation 53
Relationship between Bending and Radius of Curvature - Round Thread Casing

API Equation 54
Calculated Plain-End Weight

API Equation 55
Calculated Threaded and Coupled Weight

API Equation 56
Calculated Upset and Threaded Weight

API Equation 57
Calculated Upset Weight

API Equation 58
Weight Gain Due To End Finishing - Generic

API Equation 59
Weight Gain Due To End Finishing - Threaded and Coupled

API Equation 60
Weight Gain Due To End Finishing - Upset and Threaded

API Equation 61
Weight Gain Due To End Finishing - Upset

API Equation 62
Theoretical Weight of a Length of Pipe

API Equation 63
Diameter at Center of Coupling - Line Pipe and Round Thread

API Equation 64
Volume I for Round Thread and Line Pipe Couplings

API Equation 65
Volume II for Round Thread and Line Pipe Couplings

API Equation 66
Volume of Coupling - Vol. (I+II+III)

API Equation 67
Vol. III for Round Thread and Line Pipe Couplings

API Equation 68
Calculated Coupling Weight - Round Thread and Line Pipe

API Equation 69
Vol. IV(approx.) - Pipe Coupling with Special Bevel

API Equation 70
Vol. IV(actual) - Pipe Coupling with Special Bevel

API Equation 71
Coupling Weight Removed by Special Bevel

API Equation 72
Coupling Weight - Pipe Coupling with Special Bevel

API Equation 73
Diameter at Center of Coupling - Buttress Thread

API Equation 74
Diameter at End of Coupling - Buttress Thread

API Equation 75
Vol. I for Buttress Thread Pipe Couplings

API Equation 76
Volume of Coupling - Vol(I+II) - Buttress Thread

API Equation 77
Vol. II for Buttress Thread Couplings

API Equation 78
Calculated Coupling Weight - Buttress Thread

API Equation 79
Diameter at End of Threads - Round, Buttress and Line Pipe Couplings

API Equation 80
Vol. I for Round, Buttress, and Line Pipe Threads

API Equation 81
Vol. II for Round, Buttress, and Line Pipe Threads

API Equation 82
Volume of Thread Portion of Coupling

API Equation 83
Vol. III for Round, Buttress, and Line Pipe Threads

API Equation 84
Calculated Weight Removed in Threading

API Equation 90
Length of Full Crest Threads-Integral Joint Tubing

API Equation 91
Diameter at End of Thread in Box - Integral Thread Tubing

API Equation 92
Vol. (I+III) - Integral Joint Tubing

API Equation 93
Vol. (II+IV) - Integral Joint Tubing

API Equation 94
Vol. (III+IV) For Integral Joint Tubing

API Equation 95
Volume Removed in Threading - Vol. (I+II) - Integral Joint Tubing

API Equation 96
Weight Removed in Threading and Recessing - Integral Joint Tubing

API Equation 136
Hydrostatic Test Pressure

API Equation 137
Maximum Hydrostatic Test Pressure for Threaded and Coupled Pipe

API Equation 138
Diameter for Formula 137 - Round Thread Casing and Tubing

API Equation 139
Diameter for Equation 137 - Line Pipe

API Equation 140
Diameter for Formula 137 - Buttress Thread Casing

API Equation 141
Internal Pressure Leak Resistance at E₁ of E₇ Plane