API 6A and 17D Bolting Stress Analysis and Fatigue Consideration

摘要

API 6A and 17D, specifications provide the design basis for surface and subsea production equipmentrnbolting in the oil and gas industry. These documents provide both design stress allowables and materialrnrequirements for bolting. API defined bolt preload requirements are 0.5 times the material minimum yieldrnstrength and 0.67 times the minimum yield strength for API 6A and 17D, respectively. The maximumrnallowable stress in the bolt due to pressure, thermal and external loading is defined to be 0.83 times thernminimum yield strength based on the nominal stress in the bolt at the minimum root diameter.