Engineering critical assessment on welding flaws of the X65 UOE girth weld based on CRACKWISE

Focused on the girth weld of a φb762 × 28.6 mm (X65) offshore UOE pipe,the fracture toughness properties at different weld joint positions were tested.Meanwhile,the largest size of different cracks under service condition was calculated by using CRACKWISE.The service life of the UOE pipe with postulated crack-like flaws was calculated by considering various fatigue factors,such as vibrations caused by ocean currem and fluctuations of inner pressure.The assessment process and results can be used to direct the repair of weld flaws laid in pipes or to assess the reliability of in-serving pipes.