Full-scale tests of pipe sections with surface axial and circumferential notches to justify the concept "Leak-Before-Break"

  In order to verify the developed limit load analytical models of the pipe elements with crack-like surface defects of different orientation and determining the mechanism of the possible fracture ("leak" or "break"), full-scale tests of the pipe sections (straight pipe, elbow, T-junction) with axial and circumferential defects were performed.

 Test objects:

  • straight pipe,

  • elbow,

  • T-junction.

  Full-scale test types:

  • straight pipes with axial surface notches under internal pressure,

  • straight pipes with circumferential surface notches under internal pressure,

  • straight pipes with circumferential surface notches under combined internal pressure and bending,

  • pipe bend (elbow) with axial surface notch (on external creator) under internal pressure,

  • T-junctions with axial surface notches (in nozzle zone) under internal pressure.

def1.png

Leak

def2.png

Break

Full-scale test of T-junction with axial surface notch