Allowable Torque And Pull On Api Drillpipe

The following equations should be used to determine the maximum allowable torque for a drillpipe under a tension P (including safety factor)'

In field units where Qt = Minimum torsional yield strength under tension, Ib-ft

J = Polar moment of inertia

ALLOWABLE TORQUE AND PULL ON NEW API DRILLPIPE WITHOUT ANY SAFETY FACTORS {See notel) (FIELD UNITS)

NOTE 2

Minimum unit torsional yieldstrength in shear assumed at 57.7% of minimum yieldstrength in tension

EXAMPLE

5"-19.5 lbs/ft grade e. drillpipe tensile load is 300,000 lbs

ALLOWABLE TORQUE AND PULL ON NEW API DRILLPIPE WITH SAFETY FACTORS OF 0.85 (FIELD UNITS)

NOTE 1

The maximum allowable torques and pulls have been calculated with maximum stress value limited to 85% of the minimum yield of the material in questions

NOTE 2

Minimum unit torsional yieldstrength in shear assumed at 57.7% of minimum yieldstrength in tension

EXAMPLE

5"-19.5 lbs/ft grade e. drillpipe tensile load is 300,000 lbs

ALLOWABLE TORQUE AND PULL ON API "PREMIUM" DRILLPIPE WITH 0,85 SAFETY FACTOR (FIELD UNITS)

Drill Pipe Stress Torque And Tensin

NOTE 2

Minimum unit torsional yieldstrength in shear assumed at 57.7% of minimum unit yieldstrength in tension

EXAMPLE

5"-19.5 lbs/ft grade e. drillpipe tensile load is 215,000 lbs

ALLOWABLE TORQUE AND PULL ON NEW API DRILLPIPE WITHOUT ANY SAFETY FACTORS (See notel) (S.I. UNITS)

Tube Pull Load Formulas
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