Fracture studies on carbon steel pipes and elbows at high pressure and temperature subjected to bending moment
Fracture studies were carried out on 219 mm, 406 mm and 610 mm outer diameter of SA 333 Gr.6 carbon steel straight pipes and elbows having part-through/through-wall crack with internal pressure under in-plane bending. The nominal thickness of the pipes and elbows varied 18.5 mm to 56.6 mm. The initial notch angle varied from 30° to 150° and the internal pressure was maintained in the range of 10 MPa to 25 MPa.
Fracture studies were also conducted on carbon steel pipes and elbows of 219 mm OD and 406 mm OD having circumferential part-through notches, under monotonic bending and at an elevated temperature of 300°C. For heating the pipe at the notch location, the notch portion of the pipe was wrapped with heating elements covered with ceramic cloth. Above this, insulation material was provided to prevent heat loss
