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API Spec bending strength ratio calculated carbon dioxide classification collapse pressure collapse resistance Contact Angle corrosion rates cross sectional area curves cyclic stress Diameter reduction DOGLEG SEVERITY drill collars drill pipe drill stem drill string drilling fluid drive section elevator equation EU-G EU-S EU-X Extra Hole Factor of Safety fatigue damage formula ft-lb Grade E drill hydrogen sulfide inches Inspection Class kelly drive lateral force lb/ft length of drill less than 80 lEU-G lEU-X lnternal Flush maximum minimum yield strength oil mud Premium Class recommended make-up torque Reduced Cross Remaining wall ROTARY SHOULDERED CONNECTION shear strength Slim Hole steel stress Sulfide Stress Cracking Table Tensile Data tensile load tensile strength tension thread tong tool joint torsional strength torsional yield strength tubing work strings uniform wear values wall not less wall not Remaining wall thickness wear pattern WlTH